Steel Shell Boilers. Max-3 plus kw. Max-3 E & Max-3 condens E kw. CompactGas kw. SR-plus and SR-H plus kw

Steel Shell Boilers Max-3 plus 420-2700 kw Description 194 Technical Data and Dimensions 198 Typical Hydraulic Schematic 204 Engineering 205 Max-3 E & Max-3 condens E 3000-6839 kw Description 207 Technical Data and Dimensions 214 Typical Hydraulic Schematic 224 Engineering 225 CompactGas 700-4200 kw Description 226 Technical Data and Dimensions 228 Typical Hydraulic Schematic 233 SR-plus and SR-H plus 500-3930 kw Description 235 Technical Data and Dimensions 237 Typical Hydraulic Schematic 241 High pressure, high temperature version of the SR-plus available on request July 2018 - Rev 02 193

Max-3 plus (420-2700) DESCRIPTION Hoval Max-3 plus Economical Saving Energy Cost-effective solution due to low investment cost Highly efficient due to being fitted with additional retarders/ Power Saving due to large water capacity Ecological Low emissions Environmentally Friendly due to low NOx emissions Low CO 2 emissions due to minimal gas consumption Outstanding emissions values due to modulation of low NOx burners Easy to Use Simple Maintenance Easy to use due to intelligent design details. User friendly controls with TopTronic E system Service friendly due to easy front door access Sophisticated Versatile Option Large range of applications due to flexible combination options Space-saving due to compact design Simple installation due to one piece heat exchanger. 194 November 2017 - Rev 01

Max-3 plus (420-2700) DESCRIPTION Hoval Max-3 plus Oil/gas boiler Boiler According to BSEN14394 Three-pass steel shell boiler manufactured to European Standards for firing with Gas Oil and Natural Gas Max-3 plus complies with the Pressure Equipment Directive 97/23/EG Additional retarders fitted for enhanced efficiency Boiler completely welded Suitable for use with a Low NOx-burner having internal flue gas re cir cu lation Insulation of the boiler body 80mm mineral wool mat Boiler completely cased with steel sheet panels, red powder coated Flue gas outlet to the rear Heating flow connection to the top, heating return connection to the rear, incl. mating flanges, nuts, bolts & washers and gaskets Optional Side mounted TopTronic E control panel with boiler control and limit thermostat suitable for different applications Free standing calorifier Boiler door hinges to the left Delivery Control panel TopTronic E13.4 For operating temperature up to 90 C For mounting on the left or the right hand side (right hand standard) Integrated control functions for: 1 mixing circuit 1 direct heating circuit 1 hot water loading circuit bivalent and cascade management Option to expand by max. 1 module expansion: module expansion heating circuit or module expansion heat accounting or module expansion universal Can be optionally networked with a total of up to 16 controller modules (incl. solar module) Consisting of: electrical box control panel TopTronic E control module TopTronic E basic module heat generator burner control function device OFA-200 safety temperature limiter 110 C burner cable cpl. 2-stage, L=5.0, 1 X outdoor sensor TF/2P/5/6T/S1, L=5.0, with plug contact sensor ALF/2P/4/t/S1, L=4.0m with plug Model range Max-3 plus Output kw (420) 147-420 (530) 185-530 (620) 217-620 (750) 263-750 (1000) 350-1000 (1250) 437-1250 (1500) 525-1500 (1800) 630-1800 (2200) 770-2200 (2700) 945-2700 Boiler, insulation & casing, control panel and burner delivered separately packed On site Fitting of insulation and casing, control panel, flue retarders and burner by the installer CE-Product-ID-No. CE-0085BL0015 according to Directive on appliances burning gaseous fuels 90/396/EG. Control panel TopTronic E13.5 As TopTronic E/E13.4, but: For operating temperature up to 105 C Safety temperature limiter 120 C Configuration as control panel TopTronic E/ E13.4 above The boiler complies with the PED Pressure Equipment Directive 97/23EG. November 2017 - Rev 01 195

Max-3 plus (420-2700) DESCRIPTION 3rd pass 2nd pass 1st pass Clean combustion With the proven three-pass technique, the hot combustion gases are immediately moved out of the high- temperature zone. The flame temperature is reduced, and the pollutant emissions are minimised. Low operating costs of the Hoval 3-pass boiler can be taken for granted The Hoval three-pass boiler transforms the energy stored in oil and gas into valuable heat with impressive efficiency this is demonstrated in a full load boiler efficiency in excess of 95 %. You, as the investor, will benefit from this high efficiency in the form of substantially lower heating costs. The excellent insulation of the boiler lowers the stand-by losses and further reduces the energy consumption of the system. Maximum operating temperature is 90 C or 105 C depending on control panel type. Burners It is Hoval policy to supply boilers with matched burners from several recognised manufacturers. Details of gas pressures, noise levels, gas boosters, acoustic shrouds etc. are given on individual quotations. Dual fuel burners are available on request. Intelligent command centre for your heating system The TopTronic E control is the brain of every Hoval system. Innovative touchscreen technology ensures smooth, and continuously monitored operation. With the addition of an optional Gateway module, remote access is available from your PC, tablet or smartphone. Additionally, fault and other notifications can be e-mailed to your mobile phone, so you can always be in touch with your system. Installation wherever you want it! The compact dimensions of the boiler means that the Max-3 plus is perfect for plant rooms with low ceilings. 196 November 2017 - Rev 01

Max-3 plus (420-2700) DESCRIPTION Dimpled tubes Hoval s patented development for constant high efficiency The unique design of the dimpled tubes allows a guaranteed and permanent turbulence of the flue gases. This results in an optimised heat transfer and keeps the combustion efficiency constantly high. Additional retarders are fitted for enhanced efficiency. Control panel Fitted with microprocessor-based TopTronic E operating controls. Hinged door simplifies servicing Servicing the Hoval Max-3 plus combustion components is made easier thanks to the hinged boiler door. The service technician has access to the combustion chamber and to the burner head. The handing of the boiler door can be changed to suit site layout. Insulated hinged front door for easy cleaning and quick access to the combustion chamber. An optional burner acoustic shroud is available to reduce noise level to a minimum. November 2017 - Rev 01 197

Max-3 plus (420-1000) TECHNICAL DATA Type (420) (530) (620) (750) (1000) Output at 80/60 C kw 420 530 620 750 1000 Range of output at 80/60 C kw 147-420 185-530 217-620 263-750 350-1000 Burner input maximum kw 441 557 651 788 1050 Maximum operation temperature 1 C 90 90 90 90 90 Minimum operation temperature C See table operating conditions (below) Mininum boiler return flow temperature C See table operating conditions (below) Mininum flue gas temperature C See table operating conditions (below) Safety temperature limiter setting (water-side) 2 C 110 110 110 110 110 Working/test pressure bar 6/9.6 6/9.6 6/9.6 6/9.6 6/9.6 Boiler efficiency at full loaf and 80/60 C (net calorific value/gross calorific value) natural gas Efficiency at partial load 30% (according to EN 303) natural gas (net calorific value/gross calorific value) Part L seasonal efficiency (gross calorific value) for natural gas firing % 95.2/85.8 95.2/85.8 95.2/85.8 95.2/85.8 95.2/85.8 % 97.1/87.5 97.1/87.5 97.1/87.5 97.1/87.5 97.1/87.5 % 87.2 87.2 87.2 87.2 87.2 Stand-by loss qb at 70 C Watt 1000 1035 1120 1180 1250 Flue gas resistance at nominal output natural gas 10.8% CO 2 500 m above sea level (Tolerance ± 20%) mbar 6.5 8.0 8.2 9.5 10.0 Flue gas mass flow at nominal output kg/h 680 859 1004 1215 1619 natural gas 10.8% CO 2 Flow resistance of boiler 2 z-value 0.022 0.022 0.008 0.008 0.003 Water-side resistance at 10k mbar 28.5 45.4 22.6 33.1 22.0 Water-side resistance at 20k mbar 7.1 11.4 5.6 8.3 5.5 Water flow volume at at 10k m 3 /h 36.0 45.0 53.0 64.0 86.0 Water flow volume at at 20k m 3 /h 18.0 22.5 26.5 32.0 43.0 Boiler water content litres 552 520 969 938 1528 Boiler gas volume m 3 0,583 0,602 0,846 0,872 1,350 Insulation thickness boiler body mm 80 80 80 80 80 Dry weight (incl. casing) 4 kg 1111 1171 1795 1831 2353 Combustion chamber dimension mm 606 / 1624 606 / 1624 684 / 1899 684 / 1899 782 / 2182 Combustion chamber volume m 3 0.466 0.466 0.669 0.669 1.047 Dimensions See table of dimensions Maximum draught in flue gas system (at boiler connection) Pa -50-50 -50-50 -50 1 Limited by the boiler control to 90 C (E13.4) or to 105 C (E13.5). 2 Maximum safety temperature for boiler control E13.4: 110 C; for E13.5: 120 C. 3 Flow resistance boiler in mbar = volume flow (m 3 /h) 2 x z-value. 4 Excludes weight of burner. Possible operating conditions Fuel Heating Oil EL Natural Gas min. boiler temperature C 65 75 min. return temperature C 55 65 Return temperature control Required Required (not by Hoval) 198 November 2017 - Rev 01

Max-3 plus (1250-2700) TECHNICAL DATA Type (1250) (1500) (1800) (2200) (2700) Output at 80/60 C kw 1250 1500 1800 2200 2700 Range of output at 80/60 C kw 437-1250 525-1500 630-1800 770-2200 945-2700 Burner input maximum kw 1313 1575 1890 2310 2835 Maximum operation temperature 1 C 90 90 90 90 90 Minimum operation temperature C See table operating conditions (below) Mininum boiler return flow temperature C See table operating conditions (below) Mininum flue gas temperature C See table operating conditions (below) Safety temperature limiter setting (water-side) 2 C 110 110 110 110 110 Working/test pressure bar 6/9.6 6/9.6 6/9.6 6/9.6 6/9.6 Boiler efficiency at full loaf and 80/60 C (net calorific value/gross calorific value) natural gas Efficiency at partial load 30% (according to EN 303) natural gas (net calorific value/gross calorific value) Part L seasonal efficiency (gross calorific value) for natural gas firing % 95.2/85.8 95.2/85.8 95.2/85.8 95.2/85.8 95.2/85.8 % 97.1/87.5 97.1/87.5 97.1/87.5 97.1/87.5 97.1/87.5 % 87.2 87.2 87.2 87.2 87.2 Stand-by loss qb at 70 C Watt 1380 1850 1950 2100 2300 Flue gas resistance at nominal output natural gas 10.8% CO 2 500 m above sea level (Tolerance ± 20%) mbar 12.0 10.0 12.0 13.0 13.0 Flue gas mass flow at nominal output kg/h 2025 2429 2916 3564 4374 natural gas 10.8% CO 2 Flow resistance of boiler 2 z-value 0.003 0.002 0.002 0.002 0.002 Water-side resistance at 10k mbar 34.4 33.0 47.6 71.1 107.1 Water-side resistance at 20k mbar 8.6 8.3 11.9 17.8 26.8 Water flow volume at at 10k m 3 /h 107.0 129.0 154.0 189.0 231.0 Water flow volume at at 20k m 3 /h 53.5 84.5 77.0 94.5 115.5 Boiler water content litres 1478 2343 2750 3050 3550 Boiler gas volume m 3 1,390 1,956 2,510 2,761 3,037 Insulation thickness boiler body mm 80 80 80 80 80 Dry weight (incl. casing) 4 kg 2643 3614 4693 5077 5649 Combustion chamber dimension mm 782/2182 880/2415 980/2595 980/2895 980/3200 Combustion chamber volume m 3 1,047 1,58 2,07 2,30 2,41 Dimensions See table of dimensions Maximum draught in flue gas system (at boiler connection) Pa -50-50 -50-50 -50 1 Limited by the boiler control to 90 C (E13.4) or to 105 C (E13.5). 2 Maximum safety temperature for boiler control E13.4: 110 C; for E13.5: 120 C. 3 Flow resistance boiler in mbar = volume flow (m 3 /h) 2 x z-value. 4 Excludes weight of burner. Possible operating conditions Fuel Heating Oil EL Natural Gas min. boiler temperature C 65 75 min. return temperature C 55 65 Return temperature control Required Required (not by Hoval) November 2017 - Rev 01 199

Max-3 plus (420-2700) TECHNICAL DATA Flue gas temperature and output range In order to reach a good combustion quality, the indicated minimum temperature must be adhered to. With new installations acidic condensate-proof chimneys should be fitted, or the flue gas temperature must be adjusted higher (min. 160 C). The minimum flue gas temperature must be in accordance with the flue design, otherwise the formation of acidic condensate can cause long term damage. 130 125 Max-3 plus (1250) Max-3 plus (530) Max-3 plus (1000) Max-3 plus (1500) Max-3 plus (420) Max-3 plus (620) Max-3 plus (750) Max-3 plus (1800) Max-3 plus (2200) Max-3 plus (2700) 120 115 Flue gas temperature ( C) 110 105 100 95 90 85 80 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 kw = Boiler output C = Flue gas temperature with clean heating surfaces, boiler flow temperature 80 C, return temperature 60 C (in accordance with DIN 4702). Combustion chamber resistance Output (kw) - Operation with heating oil EL, natural gas λ = 1,11 with max. burner output (CO 2 natural gas = 10,8 %) - A reduction of the boiler water temperature of 10K causes a reduction of the flue gas temperature of approx. 6-8K. - A change in the CO 2 emission value of +/-1% causes a change in the flue gas temperature of approx. -/+8K. 13 12 1250 1800 2200 2700 Combustion chamber resistance (mbar) 11 10 9 8 7 6 5 4 3 2 420 530 620 750 1000 1500 1 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 Boiler output (kw) kw = Boiler output mbar = Flue gas resistance λ = 1,11 (CO 2 natural gas = 10,8 %) 500 m above sea level (Tolerance +/- 20%) 200 November 2017 - Rev 01

Max-3 plus (420-2700) DIMENSIONS Max-3 plus (420-1250) (Dimensions in mm) Max-3 plus (1500-2700) (Dimensions in mm) 1 Flow (420,530) DN 100, PN 6 (620,750) DN 125, PN 6 (1000,1250) DN 150, PN 6 (1500-2200) DN 150, PN 6 (2700) DN 200, PN 6 2 Return (420,530) DN 100, PN 6 (620,750) DN 125, PN 6 (1000,1250) DN 150, PN 6 (1500-2200) DN 150, PN 6 (2700) DN 200, PN 6 3 Flue gas outlet 4 Cleaning opening 5 Flue gas collector cleaning opening R 1 6 Drain R 1½ 7 Cable routing 8 Control panel 9 Electrical connection 10 Bushing Rp ¾ with immersion sleeve for boiler temperature sensor Max-3 plus Type a b c f g h i k l l1 m n Ø o p q r (420,530) 1060 1190 515 1770 181 1230 950 104 2178 2074 641 100 299 54 34 175 (620,750) 1180 1310 550 2045 181 1350 1050 105 2452 2347 666 95 349 55 35 170 (1000,1250) 1370 1500 635 2330 181 1550 1250 107 2739 2632 681 111 349 77 37 175 (1500) 1560 1610 665 2685 212 1710 1350 103 3040 2940 722 80 447 83 34 65 (1800) 1720 1770 735 3055 214 1870 1460 103 3424 3320 724 80 447 83 52 65 (2200) 1720 1770 735 3355 214 1870 1460 101 3724 3625 724 80 447 81 50 65 (2700) 1750 1800 755 3700 212 1900 1410 82 4032 3950 722 80 647 82 51 65 Max-3 plus Type s t u v w x (420,530) 350 595 660 1330 450 - (620,750) 550 722 786 1445 475 - (1000,1250) 415 620 685 1660 590 - (1500) 310 777 842 1790 695 1850 (1800) 310 890 952 1950 773 2040 (2200) 310 890 952 1950 773 2340 (2700) 370 917 982 1980 790 2670 Notes: A safety valve must be fitted by the installer in the boiler flow pipework directly between the boiler and the downstream isolating valve. If fitting a boiler altitude gauge, a 3/8 BSP socket should be fitted by the installer in the flow pipework adjacent to the boiler to enable connection of the altitude gauge pipework. It is recommended to mount the Max-3 plus boiler onto a suitable plinth at least 150mm high to facilitate the fitting of a drain valve. Please also see important notes on the engineering guidelines page. November 2017 - Rev 01 201

Max-3 plus (420-2700) DIMENSIONS inner Max-3 plus a * b c d e f g i k l m n o p (420,530) 1920 150 1770 277 2222 1060 1180 120 1060 1376 2077 175 460 1072 (620,750) 2195 150 2045 228 2498 1180 1300 120 1180 1496 2353 172 485 1192 (1000,1250) 2480 150 2330 228 2783 1370 1500 120 1380 1660 2638 198 500 1392 (1500) 2685 164 2568 260 3083 1560 1680 120 1560 1842 2923 240 510 - (1800) 3055 166 2760 450 3467 1720 1840 120 1720 2002 3325 430 510 - (2200) 3355 166 3060 450 3767 1720 1840 120 1720 2002 3625 430 510 - (2700) 3700 164 3390 430 4075 1750 1870 120 1750 2039 3953 430 510 - Max-3 plus q r s v w x y (420,530) 175 350 950 475 990 - - (620,750) 170 550 1050 535 1110 - - (1000,1250) 175 415 1250 630 1298 - - (1500) 65 310 1350 725 1494 1790 153 (1800) 65 310 1460 805 1654 1950 153 (2200) 65 310 1460 805 1654 1950 153 (2700) 65 330 1410 820 1684 1980 153 * Max-3 plus (1500-2700): Drain connection protudes past the base channel Required minimum width of door and corridor to bring in the boiler The stated measurements are minimal dimensions B K = T x L fdgdfgdfg B K = T x L T = Door width K = Corridor width B = Boiler width L = max. length of boiler K L B < 150 T 202 November 2017 - Rev 01

Max-3 plus (420-2700) BURNER FLANGE DIMENSIONS Max-3 plus (420,530) Max-3 plus (620-2700) Screw joint flange Max-3 plus (420,530) 4 x M12 (45 ) 4 x M12 (15 ) Screw joint flange Max-3 plus (620,750) 6 x M12 (15 ) Screw joint flange Max-3 plus (1000-2700) 6 x M16 (15 ) Swinging out of boiler door Boiler door is swivelling to the right or left (Dimensions in mm) Dimensions (Dimensions in mm) Max-3 plus Type A B C D E F G H M (420,530) 290 330 515 250 606 1624 163 30 420 (620,750) 350 400 550 310 684 1899 163 30 500 (1000,1250) 400 450 635 330 782 2182 163 30 550 (1500) 400 450 665 360 880 2417 170 30 600 (1800) 400 450 735 360 976 2605 170 30 600 (2200) 400 450 735 360 976 2905 170 30 600 (2700) 400 450 755 360 976 3233 170 30 600 Max-3 plus Type a b (420) 1060 150 (530) 1060 150 (620) 1180 150 (750) 1180 150 (1000) 1370 150 (1250) 1370 150 (1500) 1520 175 (1800) 1680 175 (2200) 1680 175 (2700) 1700 175 November 2017 - Rev 01 203

Max-3 plus (420-2700) TYPICAL HYDRAULIC SCHEMATIC Hydraulic principle schematic Max-3 plus with heating controller TopTronic E Hydraulic schematic BEFE010 Important! Minimum return temperature must be adhered to. Hydraulic principle schematic Max-3 plus with heating controller TopTronic E Hydraulic schematic BEFE020 Notes : These hydraulic schematics are to be used for indicative purposes only. They do not contain all required items for the installation. The installation must comply with all relevant regulations. For underfloor heating, a flow temperature limiter must be installed. Safety valves must be fitted directly to the boilers (with no isolation valve). Lock shield valves must be used for the expansion vessel. Anti-thermal siphon loops must be installed to ensure natural circulation is not present. Pressure limiter (in accordance with BSEN12828 clause 4.6.2.2.2 - Heating Systems In Buildings). All Max-3 plus models should have an associated pressure limiter device fitted in the system pipework, as close as possible to the boiler itself (provided by the installer - not supplied, fitted or wired by Hoval). If the operating pressure of the heating system exceeds the given pressure limit, or in the case of auxiliary power interruption, the pressure limiter shall shut off the heating equipment and interlock against it restarting. The pressure limiter shall be adjusted so that it responds before the safety valve(s) operate. Not shown on these schematics. RBM Room station AF Outdoor sensor RLF Return sensor VF1 Flow sensor 1 VF2 Flow sensor 2 SF Calorifier heater sensor B1 Flow temperature guard (if required) MK1 Pump mixing circuit 1 MK2 Pump mixing circuit 2 SLP Calorifier loading pump DKP Direct heating circuit ZUP Feed pump YK1 Actuator mixer 1 YK2 Actuator mixer 2 YKR Actuator return mixer TTE-GW Gateway TTE-WEZ Base module heat generator TTE-FE HK Extension module 204 November 2017 - Rev 01

Max-3 plus (420-2700) ENGINEERING Regulations and guidelines The following regulations and guidelines must be observed: Hoval technical information and installation instructions. Relevant British Standards and Guidelines. Hydraulic and technical control regulations. Water quality Heating water: European standard BSEN 14868:2005 and VDI guideline 2035 must be observed. Particular note must be taken of the following regulations. Hoval boilers and water heaters are suitable for heating systems without significant oxygenation (system type 1 in accordance below with BSEN 14868:2005). Systems with; Continuous oxygenation (e.g. floor heating without diffusion-proof plastic Flue gas system pipes) or, Flue systems must comply with current Intermittent oxygenation (e.g. frequent British Standards and legislation. topping up required) must be fitted with a The flue must be pressure tight, able to withstand slight positive over pressure. system separator. Treated heating water must be checked at Flue system must be able to cope with flue least once per year or more frequently as gas temperatures up to 190 C. specified by the inhibitor manufacturer. The flue should be able to withstand the If, in the case of existing systems (e.g. mildly acidic nature of any condensate that boiler replacement), the water quality of the might form. Any condensate should not be existing heating water complies with VDI allowed to collect in the flue and should be 2035, it is not recommended that the system drained via a suitable trapped drain not be refilled. VDI 2035 also applies to top-up back via the boiler. water. Before filling new systems, or, if applicable, existing systems, the heating system must be professionally cleaned and flushed. The heating system must be flushed before the boiler is filled. Components of the boiler / heat exchanger that come into contact with water are made of ferrous materials. Due to the risk of stress corrosion cracking, the combined chloride, nitrate and sulphate content of the heating water must not exceed a total of 200mg/l. Once the heating has been in operation for 6 12 weeks, the ph value of the heating water should be between 8.3 and 9.5. Water for filling and topping up the system: Untreated drinking water is generally most suitable for filling and topping up a system with a Hoval boiler. However, the water quality of the untreated drinking water must always comply with VDI 2035 or must be demineralised and/or treated with inhibitors. The specifications of BSEN 14868:2005 must be observed. In order to maintain the boiler s high efficiency level and to avoid overheating of the heating surfaces, the values in the table Important Notes! A condensate trap must be fitted on the boiler flue outlet to prevent condensate entering the boiler. A condensate drain point is provided in the flue outlet smoke box and this should be piped to drain via a drain trap to prevent flue gases escaping. No isolating valve should be fitted in this pipework. below must not be exceeded. These values are calculated in relation to the boiler output (the smallest individual boiler in the case of multiple boiler systems) and the water content of the system. The total quantity of water used to fill and top up the system during the boiler s life must not exceed a value equivalent to three times the water content of the system. Heating system Combustion air A suitable supply of combustion air must be guaranteed. It must not be possible to close the air supply opening. Minimum free area for the air supply opening at low level is 4cm 2 per 1kW boiler input. Minimum free area for the air supply opening at high level is 2cm 2 per 1kW boiler input. Chimney/flue gas system A flue gas sampling point with an internal diameter 10-21mm should be included adjacent to the flue spigot, extending through any thermal insulation. The pressure condition at the boiler spigot ideally should be balanced It can be slightly negative (up to -50Pa) or slightly positive depending on the matched burner. Check with Hoval Technical. A draught stabiliser may be required if the draught exceeds the figure indicated. D < 2D 2 x D 1D Flue gas test point D Burner mounting When mounting the burner an adapter flange may be required depending on the burner being used. If this is required this will be fitted to the boiler door and supplied with all additional fixings before it is dispatched from Hoval. The flexible oil pipes or gas pipework should be installed in such a manner that the door can be opened 90 with the burner still attached. All services must be fitted in such a manner that the boiler door can be opened fully. Electrical connection A single phase 230V supply is required for the control panel operation. Single phase burners are electrically supplied via the control panel. Three phase burners require a separate three phase isolated supply (by the installer) direct to the burner. In this case control cables fitted with wieland plug/sockets will still run between the control panel and the burner. All power supplies to the burner/boiler/other associated equipment (ie.: gas booster, separate oil pump, etc.) Noise attenuation The following steps can be taken to reduce noise: Make the walls, ceiling and floor of the boiler plant room as solid as possible, fit sound absorbers in the air supply ducting, provide conduit supports and brackets with sound dampening fittings. If there are living quarters either above or below the boiler plant room, fit rubber vibration strips underneath the base channels of the boiler and connect conduits flexibly with flexible connections. Connect circulating pumps to the network with flexible connections. In order to dampen flame noise in the flue, sound absorbers can be fitted in the flue system (consider leaving space for subsequent installation). Maximum filling quantity based on VDI 2035 Total hardness of filling water up to [mol/m 3 ] 1 <0.1 0.5 1 1.5 2 2.5 3 >3.0 f H <1 5 10 15 20 25 30 >30 d H <0.56 2.8 5.6 8.4 11.2 14.0 16.8 >16.8 e H <0.71 3.6 7.1 10.7 14.2 17.8 21.3 >21.3 ~mg/l <10 50.0 100.0 150.0 200.0 250.0 300.0 >300 Conductivity <20 100.0 200.0 300.0 400.0 500.0 600.0 >600 Boiler size of maximum filling quantity without demineralisation individual boiler 50 to 200kW NO REQUI- 50l/kW 20l/kW 20l/kW 200 to 600kW RE- 50l/kW 50l/kW 20l/kW Always desalinate over 600kW MENT 1 Total of alkaline earths 2 If the conductivity in µs/cm exceeds the value specified in the table a water analysis must be carried out November 2017 - Rev 01 205

Hoval at Windsor Castle 206 November 2017 - Rev 01 November 2017 - Rev 01

Max-3 E (3000-6000) DESCRIPTION Hoval Max-3 E (3000-6000) Low consumption thanks to high efficiency rating Fewer harmful emissions thanks to sophisticated design and low-nox burner Long service life thanks to special return water inlet Assembly pipe A thermometer, thermostat and pressure gauge are fitted here. Return inlet with injection effect The return water is heated evenly, meaning no condensation can form on the flue surface. Retarders Improve the heat transfer and thus the efficiency rating. Highly efficient thermal insulation with aluminium cladding Large, thermally insulated boiler door Easy to open, providing easy access for maintenance work. Low-NOx burner helps significantly reduce harmful emissions Technical Data (3000) (4000) (5000) (6000) Thermal output range at 80/60 C kw 750-3000 950-4000 1150-5000 1450-6000 Max. heating boiler operating temperature C 105 105 105 105 Operating pressure (option) Boiler efficiency rating at partial load of 30% (in accordance with EN 303 and EN 304) bar 6/9.6 (10/16) 6/9.6 (10/16) 10/16 10/16 % 94.9/85.5 94.9/85.5 94.9/85.5 95.0/85.5 Boiler efficiency rating at full load 1 at 80/60 C 1 % 93.2/84.0 93.3/84.0 93.3/84.0 93.3/84.0 Boiler water volume l 6,400 7,100 7,800 9,900 Boiler dry weight including cladding (6/9.67 10/16 bar) kg 6,845/7,987 8,049/9,392 -/11321 -/14,081 Dimensions W 2086 2186 2286 2480 L H mm 4328 2508 4648 2608 5005 2708 5235 2894 1 with regard to lower/upper heating value November 2017 - Rev 01 207

Max-3 E (3000-6000) DESCRIPTION 1 2 3 Retarders inside the third pass tubes ensure increased efficiency Efficient three-pass technology in the Max-3 E The special return inlet increases the boiler s service life Retarders increase cost-effectiveness The E stands for efficiency, in the Max- 3 E, special retarders in the third pass ensure increased heat transfer in the heat exchanger. Fewer harmful emissions thanks to three-pass technology. While a low-nox burner reduces harmful emissions, the technology and design of the Max-3 E reduces them even further. In the first pass, a cylindrical combustion chamber directs the flue gases to the smooth tube flue surfaces. These are arranged around the combustion chamber and form the second and third passes. The flue surfaces have a large area and keep the temperature of the flue gases low, minimising loss. Spacious reversal chambers redirect the flue gases, allowing them to flow through the flue surfaces evenly. Guaranteed long service life. This return inlet is unique - and a typical innovation for Hoval. It works like an injector. The return water from the heating system enters at the top in the warm area of the heating boiler. A baffle plate turns the in-coming water by 90 and speeds it up. The water flowing out of the baffle plate pulls in hot boiler water, which mixes thoroughly with the colder return water. This increases the temperature of the return water and prevents condesation from forming on the flue surface, significantly enhancing the service life. Delivered ready-to-use and easy to maintain. The Max-3 E comes in four sizes. It is delivered assembled and readyto-use complete with full thermal insulation and cladding. Flexibly adjustable connections make for easy installation and reduce costs. Lifting hooks and a robust base frame make the boiler easy to transport to the boiler room. The large boiler door ensures easy access for cleaning. The tube nest area of the second pass can be easily accessed thanks to the large combustion and reversal chambers. In other words, the Max-3 E has its benefits for technical personnel too. 208 November 2017 - Rev 01

Max-3 condens E (3000-6000) DESCRIPTION Hoval Max-3 condens E (3000-6000) Outstanding efficiency with integrated flue gas condensing heat exchanger Fewer harmful emissions thanks to sophisticated design and low-nox burner Long service life thanks to special return water inlet Flue gas condensing heat exchanger This allows the residual heat in the flue gas to be utilised as well. Return inlet with injection effect The return water is heated evenly, meaning no condensation can form on the flue surface. Assembly pipe A thermometer, thermostat and pressure gauge are fitted here Highly efficient thermal insulation with aluminium cladding Large, thermally insulated boiler door Easy to open, providing easy access for maintenance work Low-NOx burner Helps significantly reduce harmful emissions Type (3000) (4000) (5000) (6000) Thermal output range at 80/60 C kw 774-3162 982-4215 1195-5305 1498-6331 Thermal output range at 80/30 C kw 838-3325 1064-4431 1295-5578 1624-6662 Ultra low Boiler efficiency rating at partial load of 30% sulphur 1 % 103.4/97.5 103.2/97.4 104.0/98.1 103.5/97.6 (in accordance with EN 303 and EN 304) fuel oil Boiler efficiency rating at full load 1 at 80/60 C % 97.1/91.6 97.1/91.6 97.1/91.6 97.2/91.7 Natural Gas H Thermal output range at 80/30 C kw 862-3412 1099-4546 1345-5732 1678-6839 Boiler efficiency rating at partial load of 30% 1 (in accordance with EN 303 and EN 304) % 108.4/97.7 108.2/97.5 109.0/98.2 108.5/97.7 Boiler efficiency rating at full load 1 at 80/60 C % 97.1/87.5 97.1/87.5 97.1/87.5 97.2/87.5 Max. heating boiler operating temperature C 105 105 105 105 Operating/test pressure (option) bar 6/9.6 (10/16) 6/9.6 (10/16) 10/16 10/16 Boiler water volume (including gas heat exchanger) l 6525 7260 8030 10160 Boiler dry weight including cladding (6/9.6 / 10/16 bar) kg 7668/8801 9265/10563 -/12,905 -/15,872 Dimensions W L H 1 with regard to lower/upper heating value mm 2086 5592 2508 2186 5192 2608 2286 6269 2708 2480 6499 2894 November 2017 - Rev 01 209

Max-3 condens E (3000-6000) DESCRIPTION Technically sophisticated right through to the heat exchanger. Maximise potential with the flue gas condensing heat exchanger. The Max-3 Condens E is a three-pass hot water boiler that has all the benfits that set a Hoval product apart - and that s not all: an integrated flue gas condensing heat exchanger stands out for its large heat transfer surface, whose dimensions increase the rate of condensation. The large tube diameter of the gas heat exchanger also reduces hydraulic resistance, meaning a smaller pump is sufficient, which in turn consumes less power. Integrated flue gas condensing heat exchanger with low hydraulic resistance Delivered ready-to-use and easy to maintain. The Max-3 condens E comes in four sizes. It is delivered assembled and ready-to-use complete with full thermal insulation and cladding. Flexibly adjustable connections make for easy installation and reduce costs. Lifting hooks and a robust base frame make the boiler easy to transport to the boiler room. The large boiler door ensures easy access for cleaning. The tube nest area of the second pass can be easily accessed thanks to the large combustion and reversal chambers. In other words, the Max-3 condens E has its benefits for technical personnel too. 210 November 2017 - Rev 01

Max-3 E (3000-6000) DESCRIPTION Hoval Max-3 E oil/gas boiler Three-pass steel boiler for oil/gas firing. Mounted on steel frame, completely insulated and cased (manufactured to EN 14394). The control panel can be fitted on the right or left hand side. (standard is right hand side). Max-3 E type Output kw Operating pressure bar (3000) 750-3000 6 (3000) 750-3000 10 (4000) 950-4000 6 (4000) 950-4000 10 (5000) 1150-5000 10 (6000) 1450-6000 10 7015 498 7015 502 7015 499 7015 503 7015 504 7015 505 Delivery time will be advised at the time of quoting. Console for boiler control Console for attaching the boiler controller TopTronic E/E13.5 on the right or left hand side of the boiler (standard is right hand side). 6043 924 4216074 Katalogbilder Konsole 2-Max-3 (3000-6000) 20.12.2016 / AMPA November 2017 - Rev 01 211

Max-3 condens E (3000-6000) DESCRIPTION Hoval Max-3 condens E oil/gas boiler Three-pass steel boiler for oil/gas firing with integrated flue gas condensing heat exchanger. Mounted on steel frame, completely insulated and cased. Boiler manufactured to EN14394. The control panel can be fitted on the right or left hand side.(standard right hand side) The flue gas condensing heat exchanger connections are right handed as standard but can be supplied left handed (although this may extend the boiler delivery time) Max-3 Output Working condens E return 30 /natural gas pressure Type kw bar (3000) 862-3412 6 (3000) 862-3412 10 (4000) 1099-4546 6 (4000) 1099-4546 10 (5000) 1345-5732 10 (6000) 1678-6839 10 7015 756 7015 760 7015 757 7015 761 7015 762 7015 763 Delivery will be advised at the time of quoting. Console for boiler control Console for attaching the boiler controller TopTronic E/E13.5 on the right or left hand side of the boiler (standard is right hand side). 6043 924 4216074 Katalogbilder Konsole 2-Max-3 (3000-6000) 20.12.2016 / AMPA 212 November 2017 - Rev 01

Max-3 (3000-6000) DESCRIPTION Boiler controller with TopTronic E control Boiler controller TopTronic E/E13.5 for mounting on heat generator right hand side (standard) or left hand side (configuration on request). Specify mounting variant in purchase order. Maximum operating temperature 105 C Safety temperature limiter 120 C 6040 237 Control functions integrated for 1 heating circuit with mixer 1 heating circuit without mixer 1 hot water loading circuit bivalent and cascade management Can be optionally expanded by max. 1 module expansion: module expansion heating circuit or module expansion heat accounting or module expansion universal Can be optionally networked with a total of up to 16 controller modules (incl. solar module) Consisting of: electrical box control panel TopTronic E control module TopTronic E basic module heat generator oil automatic function device OFA-200 safety temperature limiter burner cable cpl. 2-stage, L = 5.0 m 1x outdoor sensor AF/2P/K immersion sensor TF/2P/5/6T/S1, L = 5.0 m with plug contact sensor ALF/2P/4/T/S1, L = 4.0 m with plug November 2017 - Rev 01 213

Max-3 E (3000-6000) TECHNICAL DATA Max-3 E (3000-6000) Type (3000) (4000) (5000) (6000) Nominal output at 80/60 C kw 3000 4000 5000 6000 Heat output range (natural gas H: variant 2) kw 750-3000 950-4000 1150-5000 1450-6000 Heat output range (heating ULS class A2*, natural gas H: variant 1, heating oil class C2 or D*) kw 1700-3000 2250-4000 2800-5000 3400-6000 Heat input (net) kw 782-3218 990-4289 1197-5361 1509-6433 Maximum boiler operation temperature 2 C 105 105 105 105 Minimum boiler operation temperature C see table operating conditions (below) Minimum boiler return flow temperature (directly into the boiler downstream of the flue gas heat exchanger) C see table operating conditions (below) Safety temperature limiter setting (water side) 3 C 120 120 120 120 Operating/test pressure bar 6/9.6 6/9.6 10/16 10/16 Operating/test pressure (option) bar 10/16 10/16 - - Boiler efficiency at full load at 80/60 C % 93.2/84.0 93.3/84.0 93.3/84.0 93.3/84.0 (related to net calorific value NCV / gross calorific value GCV, natural gas H) Boiler efficiency at partial load 30 % and return 37 C (acc. to % 94.9/85.5 94.9/85.5 94.9/85.5 95.0/85.5 EN 303) (related to net calorific value NCV / gross calorific value GCV, natural gas H) Standard efficiency at 75/60 C (DIN 4702 Part 8) (related to net calorific value NCV / gross calorific value GCV, natural gas H) % 94.7/85.3 94.7/85.3 94.7/85.4 94.8/85.4 Standby losses qb at 70 C Watt 2000 2200 2400 2700 Resistance on the heating gas side at nominal output mbar 11.5 12 12 12.5 (natural gas H, 10.5 % CO 2 ). 500 m above sea level (tolerance ± 20 %) Flue gas mass flow at nominal output (natural gas H, 10.5 % CO 2 ) kg/h 4731 6301 7876 9451 Flow resistance boiler 1 z-value 0.001 0.001 0.0004 0.0004 Hydraulic resistance at 10 K mbar 66 118 73 106 Hydraulic resistance at 20 K mbar 17 29 18 26 Water flow rate at 10 K m³/h 257 343 429 514 Water flow rate at 20 K m³/h 129 171 214 257 Boiler water capacity litres 6400 7100 7800 9900 Insulation thickness of boiler body mm 100 100 100 100 Weight (incl. casing) at operating/test pressure 6/9.6 bar kg 6845 8049 - - at operating/test pressure 10/16 bar kg 7987 9392 11321 14081 Combustion chamber internal dimensions mm 900 990 1070 1133 Combustion chamber length (with extension into the reversing chamber, half the length of the reversing chamber) mm 3436 3756 4006 4236 Combustion chamber volume m³ 2.186 2.891 3.602 4.271 Dimensions Maximum draught/underpressure at flue gas outlet Pa -50-50 -50-50 1 Flow resistance boiler in mbar = flow rate (m3/h)2 x z 2 Limited by the boiler controller E13.5 TopTronic E to 105 C. 3 Max. safety temperature for boiler controller E13.5 TopTronic E 120 C. Possible operating conditions: Fuel Ultra low sulphur heating oil, class A2* Natural gas H Heating oil class C2 or D* Variant 1 Variant 2 Variant 1 Variant 2 Variant 1 min. flue gas temperature C 130 110 130 100 130 min. boiler temperature C 60 65 65 75 65 min. return temperature C 50 55 55 65 55 Return temperature control (Not by Hoval) * Classifications in accordance with BS2869. Required Required Required Required Required 214 November 2017 - Rev 01

Max-3 E (3000-6000) TECHNICAL DATA Flue gas output diagram 170 (3000) (4000) (5000) (6000) 165 160 155 Flue gas temperature C 150 145 140 135 130 125 120 115 110 105 100 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 Boiler output kw The data shown here represents an average value based on measurements taken with burners from various manufacturers. kw = Boiler output C = Flue gas temperature on a clean surface, boiler flow temperature 80 C, return temperature 60 C (in accordance with DIN 4702). Operation with natural gas H, λ = 1.14 with max. burner output (CO 2 natural gas H = 10.5 %) A reduction of the boiler water temperature of -10 K causes a reduction of the flue gas temperature of approx. 6-8 K. A change in the air index l of +/-0.09% causes a change in the flue gas temperature of approx. -/+8 K. Resistance on the boiler heating gas side 13 12 (3000) (4000) (5000) (6000) Resistance on the boiler heating gas side mbar 11 10 9 8 7 6 5 4 3 2 1 0 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 kw = Boiler output Boiler output kw mbar = Resistance on the heating gas side at λ = 1.14 (natural gas H: CO2 = 10.5 %), 500 above sea level (tolerance: +/- 20 %) November 2017 - Rev 01 215

Max-3 Max-3E (3000-6000) DIMENSIONS Max-3 E (3000-6000) (Dimensions in mm) The control can be fitted on the right or left hand side (standard is right hand side). 1 Boiler flow PN 16 2 Boiler return PN 16 3 4 Cleaning aperture (smoke box) Flue gas collector cleaning connection / drain Type (3000) (4000) (5000) (6000) 216 (3000,4000) (5000,6000) (3000,4000) (5000,6000) DN 200 DN 250 DN 200 DN 250 5 6 7 Drain PN 16 5 immersion sleeves Safety valve fitting PN 16 View A R 1½ R ¾ x 120 boiler flow (3000,4000) DN 80 (5000,6000) DN 100 8 Sight glass 8A Sight glass (optional) 9 Flue gas outlet B L H H1 H2 D Di/Da H3 H4 H5 H6 L1 L2 L3 L4 A A1 A2 A3 2086 2186 2286 2480 4328 4648 5005 5235 2508 2608 2708 2894 2393 2493 2593 2778 1283 1333 1383 1476 2070 2170 2270 2455 450/456 500/506 550/556 550/556 2326 2426 2526 2716 120 120 120 120 378 378 378 378 1783 1833 1903 1996 3955 4275 4523 4753 168 168 277 277 143 143 143 143 195 195 195 195 1695 2015 2265 2500 1150 1150 1155 1155 520 640 550 525 3200 3400 3750 4000 November 2017 - Rev 01

Max-3E (3000-6000) Max-3 TECHNICAL DATA Burner connection dimensions Flange screw connection Max-3 E (3000,4000) 6 x M16 Flange screw connection Max-3 E (5000,6000) 8 x M16 Firing system dimensions Type (3000) (4000) (5000) (6000) A B C D E F G K L 400 400 530 530 450 450 735 735 1283 1333 1383 1476 400 400 296 296 900 990 1070 1133 3211 3531 3781 4011 170 170 240 240 1410 1510 1600 1695 450 450 450 450 November 2017 - Rev 01 217

Max-3 condens E (3000-6000) TECHNICAL DATA Max-3 condens E (3000-6000) for natural gas H Type (3000) (4000) (5000) (6000) fuel natural gas H natural gas H natural gas H natural gas H Nominal output at 80/60 C kw 3162 4215 5305 6331 Nominal output at 80/30 C kw 3412 4546 5732 6839 Heat output range at 80/60 C kw 774-3162 982-4215 1195-5305 1498-6331 Heat output range at 80/30 C kw 862-3412 1099-4546 1345-5732 1678-6839 Heat input (net) kw 794-3255 1007-4340 1225-5465 1535-6515 Maximum boiler operation temperature 2 C 105 105 105 105 Minimum boiler operation temperature C see table operating conditions (below) Minimum boiler return flow temperature (directly into the boiler downstream of the flue gas heat exchanger) C see table operating conditions (below) Safety temperature limiter setting (water side) 3 C 120 120 120 120 Operating/test pressure bar 6/9.6 6/9.6 10/16 10/16 Operating/test pressure (option) bar 10/16 10/16 - - Boiler efficiency at full load at 80/60 C % 97.1/87.5 97.1/87.5 97.1/87.5 97.2/87.5 (related to net calorific value NCV / gross calorific value GCV) Boiler efficiency at full load at 80/30 C (related to net calorific value NCV / gross calorific value GCV) % 104.8/94.4 104.7/94.4 104.9/94.5 105.0/94.6 Boiler efficiency at partial load 30 % and return 27 C (acc. to % 108.4/97.7 108.2/97.5 109.0/98.2 108.5/97.7 EN 303) (related to net calorific value NCV / gross calorific value GCV) Standard efficiency at 75/60 C (DIN 4702 Part 8) (related to net calorific value NCV / gross calorific value GCV) % 107.4/96.8 107.9/97.2 108.8/98.0 108.2/97.5 Standby losses qb at 70 C Watt 2166 2383 2620 2940 Flue gas temperature at nominal output 80/ 60 C C 82 83 83 81 Resistance on the heating gas side at nominal output (natural gas H, 10.5 % CO 2 ), 500 above sea level (tolerance ± 20 %) Flue gas mass flow at nominal output (natural gas H, 10.5 % CO 2 ) mbar 12.2 13.4 12.0 12.8 kg/h 4806 6408 8069 9616 Flow resistance boiler 1 z-value 0.001 0.001 0.0004 0.0004 Flue gas heat exchanger flow resistance z-value 0.01 0.016 0.018 0.024 Boiler water flow rate at 10 K m³/h 271 361 455 543 Boiler water flow rate at 20 K m³/h 136 181 227 271 Minimum flue gas heat exchanger flow rate at 60 C return m³/h 3.5 4.6 6.5 7.1 flow temperature Minimum flue gas heat exchanger flow rate at 30 C return flow temperature m³/h 5.0 6.7 9.0 10.3 Boiler water capacity (incl. flue gas heat exchanger) litres 6525 7260 8030 10160 Insulation thickness of boiler body and flue gas heat mm 100 100 100 100 exchanger Weight (incl. casing) at operating/test pressure 6/9.6 bar kg 7668 9265 - - at operating/test pressure 10/16 bar kg 8801 10563 12905 15872 Combustion chamber internal dimensions mm 900 990 1070 1133 Combustion chamber length (with extension into the 3436 3756 4006 4236 reversing chamber, half the length of the reversing chamber) Combustion chamber volume m³ 2.186 2.891 3.602 4.271 Dimensions see Dimensions Maximum draught/underpressure at flue gas outlet Pa -50-50 -50-50 1 Flow resistance boiler in mbar = flow rate (m3/h)2 x z 2 Limited by the boiler controller E13.5 TopTronic E to 105 C. 3 Max. safety temperature for boiler controller E13.5 TopTronic E 120 C. Operating conditions: Fuel Ultra low sulphur heating oil, class A2* Natural gas H min. boiler temperature C 65 75 min. return temperature 1) C 55 65 Return temperature control 1) Required Required (Not by Hoval) 1) Before entering boiler return * Classification in accordance with BS2869. 218 November 2017 - Rev 01

Max-3 condens E (3000-6000) TECHNICAL DATA Max-3 condens E (3000-6000) for ultra low-sulphur heating oil to BS2869, class A2 (sulphur content < 50 ppm) Type (3000) (4000) (5000) (6000) Nominal output at 80/60 C kw 3162 4215 5305 6331 Nominal output at 80/30 C kw 3325 4431 5578 6662 Heat output range at 80/60 C kw 774-3162 982-4215 1195-5305 1498-6331 Heat output range at 80/30 C kw 838-3325 1064-4431 1295-5578 1624-6662 Heat input (net) kw 794-3255 1007-4340 1225-5465 1535-6515 Maximum boiler operation temperature 2 C 105 105 105 105 Minimum boiler operation temperature C see table operating conditions (below) Minimum boiler return flow temperature (directly into the boiler downstream of the flue gas heat exchanger) C see table operating conditions (below) Safety temperature limiter setting (water side) 3 C 120 120 120 120 Operating/test pressure bar 6/9.6 6/9.6 10/16 10/16 Operating/test pressure (option) bar 10/16 10/16 - - Boiler efficiency at full load at 80/60 C % 97.1/91.6 97.1/91.6 97.1/91.6 97.2/91.7 (related to net calorific value NCV / gross calorific value GCV) Boiler efficiency at full load at 80/30 C (related to net calorific value NCV / gross calorific value GCV) % 102.2/96.4 102.1/96.3 102.1/96.3 102.3/96.5 Boiler efficiency at partial load 30 % and return 27 C (acc. to % 103.4/97.5 103.2/97.4 104.0/98.1 103.5/97.6 EN 303) (related to net calorific value NCV / gross calorific value GCV) Standard efficiency at 75/60 C (DIN 4702 Part 8) (related to net calorific value NCV / gross calorific value GCV) % 102.4/96.6 102.9/97.1 103.8/97.9 103.2/97.4 Standby losses qb at 70 C Watt 2166 2383 2620 2940 Flue gas temperature at nominal output 80/ 60 C C 81 82 81 80 Resistance on the heating gas side at nominal output (natural gas H, 12.5 % CO 2 ), 500 above sea level (tolerance ± 20 %) Flue gas mass flow at nominal output (natural gas H, 12.5 % CO 2 ) mbar 12.2 13.4 12.0 12.8 kg/h 5105 6807 8508 10210 Flow resistance boiler 1 z-value 0.001 0.001 0.0004 0.0004 Flue gas heat exchanger flow resistance z-value 0.01 0.016 0.018 0.024 Boiler water flow rate at 10 K m³/h 271 361 455 543 Boiler water flow rate at 20 K m³/h 136 181 227 271 Minimum flue gas heat exchanger flow rate at 60 C m³/h 3.5 4.6 6.5 7.1 return flow temperature Minimum flue gas heat exchanger flow rate at 30 C return flow temperature m³/h 4.0 5.3 7.1 8.1 Boiler water capacity (incl. flue gas heat exchanger) litres 6525 7260 8030 10160 Insulation thickness of boiler body and flue gas heat mm 100 100 100 100 exchanger Weight (incl. casing) at operating/test pressure 6/9.6 bar kg 7668 9265 - - at operating/test pressure 10/16 bar kg 8801 10563 12905 15872 Combustion chamber internal dimensions mm 900 990 1070 1133 Combustion chamber length (with extension into the 3436 3756 4006 4236 reversing chamber, half the length of the reversing chamber) Combustion chamber volume m³ 2.186 2.891 3.602 4.271 Dimensions see Dimensions Maximum draught/underpressure at flue gas outlet Pa -50-50 -50-50 1 Flow resistance boiler in mbar = flow rate (m3/h)2 x z 2 Limited by the boiler controller E13.5 TopTronic E to 105 C. 3 Max. safety temperature for boiler controller E13.5 TopTronic E 120 C. Operating conditions: Fuel Ultra low sulphur heating oil, class A2* Natural gas H min. boiler temperature C 65 75 min. return temperature 1) C 55 65 Return temperature control 1) Required Required (Not by Hoval) 1) Before entering boiler return * Classification in accordance with BS2869. November 2017 - Rev 01 219

Max-3 condens E (3000-6000) TECHNICAL DATA Flue gas output diagram (Flow/Return 80/60 C) 86 (3000) (4000) (5000) 82 (6000) Flue gas temperature C 78 74 70 66 62 58 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 6200 6400 The data shown here represents an average value based on measurements taken with burners from various manufacturers. kw = Boiler output C = Flue gas temperature on a clean surface, boiler flow temperature 80 C, return temperature 60 C (in accordance with DIN 4702). Boiler output kw Operation with natural gas H, λ = 1.14 with max. burner output (CO 2 natural gas H = 10.5 %) A reduction of the boiler water temperature of -10 K causes a reduction of the flue gas temperature of approx. 6-8 K. A change in the air index l of +/-0.09% causes a change in the flue gas temperature of approx. -/+8 K. Resistance on the boiler heating gas side 13 (3000) (4000) (5000) (6000) 12 Resistance on the boiler heating gas side mbar 11 10 9 8 7 6 5 4 3 2 1 0 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 6200 6400 6600 Boiler output kw kw = Boiler output boiler flow temperature 80 C, return temperature 60 C mbar = Resistance on the heating gas side at λ = 1.14 (natural gas H: CO2 = 10.5 %), 500 above sea level (tolerance: +/- 20 %) 220 November 2017 - Rev 01

Max-3 condens E (3000-6000) TECHNICAL DATA Flue gas output diagram (Flow/Return 80/30 C) 64 60 (3000) (4000) (5000) (6000) Flue gas temperature C 56 52 48 44 40 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 6200 6400 6600 6800 7000 The data shown here represents an average value based on measurements taken with burners from various manufacturers. kw = Boiler output C = Flue gas temperature on a clean surface, boiler flow temperature 80 C, return temperature 30 C (in accordance with DIN 4702). Boiler output kw Operation with natural gas H, λ = 1.14 with max. burner output (CO 2 natural gas H = 10.5 %) A reduction of the boiler water temperature of -10 K causes a reduction of the flue gas temperature of approx. 6-8 K. A change in the air index l of +/-0.09% effectuates a change in the flue gas temperature of approx. -/+8 K. November 2017 - Rev 01 221

Max-3 condens E (3000-6000) TECHNICAL DATA a) Conversion of the flue gas heat exchanger output at reduced boiler capacity and changed flue gas heat exchanger water entry temperature b) Flue gas temperature downstream of flue gas heat exchanger at reduced boiler capacity Nominal output of the flue gas heat exchanger at reduced boiler capacity or changed water entry temperature Figure 1: Conversion factor for calculating the actual heat exchanger output with reference to a water entry temperature of 30 C Heat exchanger output at full boiler load and water entry temperature 30 C Max-3 condens E (3000)(4000)(5000)(6000) Natural gas (H) kw 351 483 636 748 Ultra low sulphur kw 351 483 636 748 fuel oil The nominal output of the heat exchanger at reduced boiler capacity or with changed water entry temperatures can be approximately calculated as follows. Output adapted to the actual operating case ~ conversion factor from table figure 1 x conversion factor from figure 2 x heat exchanger full load output Example Boiler Max-3 condens E (4000) Maximum boiler output = 4800 kw Desired output = 3500 kw Accordingly, 3500 kw / 4800 kw = 73 % of the nominal output Water temperature entry into the heat exchanger = 40 C Read off from figures 1 and 2 Correction factor for reduced output from figure 1 = 0.70 Correction factor for increased water entry temperature from figure 2 = 0.85 Heat exchanger output catalogue specification at 30 C = 483 kw Result corresponding to above formula: Actual output = ~0.70 x 0.85 x 483 = ~287 kw Current total heat output of the boiler/heat exchanger combination = 3500 kw + 287 kw = ~3787 kw Correction Korrekturfaktor factor 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 50 55 60 65 70 75 80 85 90 95 100 Boiler Kesselleistung output % % Figure 2: Conversion factor for calculating the heat exchanger output with other water entry temperatures Correction Korrekturfaktor factor 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 30 35 40 45 50 55 60 65 70 Water Wassertemperatur temperature Eintritt heat exchanger Wärmetauscher entry C Figure 3: flue gas temperature depending on the boiler capacity and the water temperature (30 or 60 C) on entering the flue gas heat exchanger (average boiler size values) 140 222 November 2017 - Rev 01 Flue Abgastemperatur temperature ( C) ( C) 120 100 80 60 40 20 0 30 40 50 60 70 80 90 100 Boiler Kesselleistung output in in % Water temperature 30 C (FGHE entry) Water temperature 60 C (FGHE entry)

Max-3 condens E (3000-6000) DIMENSIONS Max-3 condens E (3000-6000) 1 Boiler flow PN 16 2 Boiler return PN 16 3 4 5 6 Cleaning aperture (smoke box) Flue gas collector cleaning connection / drain Drain PN 16 R 1½ 5 immersion sleeves R ¾ x 120 boiler flow Type (3000) (4000) (5000) (6000) View A The control panel can be fitted on the right or left handside (standard is right hand side). (Dimensions in mm) (3000,4000) (5000,6000) (3000,4000) (5000,6000) DN 200 DN 250 DN 200 DN 250 B L H H1 H2 D Di/Da H3 2086 2186 2286 2480 5592 5912 6269 6499 2508 2608 2708 2894 2393 2493 2593 2778 1283 1333 1383 1476 2070 2170 2270 2455 450/458 500/508 550/558 550/558 2326 2426 2526 2716 H4 H5 120 120 120 120 378 378 378 378 7 Safety valve fitting PN 16 (3000,4000) DN 80 (5000,6000) DN 100 8 8A 9 10 11 Sight glass Sight glass (optional) Flue gas outlet Flue gas heat exchanger Flue gas heat exchanger connections PN 16 (3000,4000) DN 150 (right handed as standard) (5000,6000) DN 200 H6 H7 H8 L1 L2 L3 L4 A A1 A2 A3 A4 A5 1808 1896 2008 2139 1596 1643 1723 1816 425 505 570 645 3955 4275 4523 4753 168 168 277 277 143 143 143 143 195 195 195 195 1695 2015 2265 2500 1150 1150 1155 1155 520 640 550 525 3200 3400 3750 4000 512 512 512 512 310 310 310 310 Burner connection dimensions Flange screw connection Max-3 condens E (3000,4000) 6 x M16 Flange screw connection Max-3 condens E (5000,6000) 8 x M16 Firing system dimensions Type (3000) (4000) (5000) (6000) A B C D E F G K L 400 400 530 530 450 450 735 735 1283 1333 1383 1476 400 400 296 296 900 990 1070 1133 3211 3531 3781 4011 170 170 240 240 1410 1510 1600 1695 450 450 450 450 November 2017 - Rev 01 223

Max-3 E (3000-6000) TYPICAL HYDRAULIC SCHEMATIC Typical hydraulic schematic Max-3 E (3000-6000) with heating controller TopTronic E Max-3 plus RS-T Room station AF Outdoor sensor RLF Return sensor VF1 Flow sensor 1 VF2 Flow sensor 2 VF3 Flow sensor 3 VF4 Flow sensor 4 SF Calorifier heater sensor B1 Flow temperature guard (if required) MK1 Pump mixing circuit 1 MK2 Pump mixing circuit 2 MK3 Pump mixing circuit 3 MK4 Pump mixing circuit 4 SLP Calorifier loading pump ZUP Feed pump YK1 Actuator mixer 1 YK2 Actuator mixer 2 YK3 Actuator mixer 3 YK4 Actuator mixer 4 YKR Actuator return mixer CWS Cold Water DHWS Domestic Hot Water Notes : This hydraulic schematic is to be used for indicative purposes only. It does not contain all required items for the installation. The installation must comply with all relevant regulations. For underfloor heating, a flow temperature limiter must be installed. Safety valves must be fitted directly to the boilers (with no isolation valve). Lock shield valves must be used for the expansion vessel. Anti-thermal siphon loops must be installed to ensure natural circulation is not present. Pressure limiter (in accordance with BSEN12828 clause 4.6.2.2.2 - Heating Systems In Buildings). All Max-3 E models should have an associated pressure limiter device fitted in the system pipework, as close as possible to the boiler itself (provided by the installer - not supplied, fitted or wired by Hoval). If the operating pressure of the heating system exceeds the given pressure limit, or in the case of auxiliary power interruption, the pressure limiter shall shut off the heating equipment and interlock against it restarting. The pressure limiter shall be adjusted so that it responds before the safety valve(s) operate. Not shown on this schematic. 224 November 2017 - Rev 01

Max-3 E (3000-6000) DESCRIPTION Regulations and guidelines The following regulations and guidelines must be observed: Hoval technical information and installation instructions. Relevant British Standards and Guidelines. Hydraulic and technical control regulations. Permitted operating pressure bar > 0.5 <= 25 General requirements colourless, free of undissolved substances and foaming agents ph value at 25 C 9-11.5 Conductance at 25 C µs/cm < 1500 Total alkaline earths (Ca + Mg) 1 mmol/l < 0.02 dh < 0.112 fh < 0.19 Silica acidic capacity 8.2 2 mmol/l 1-5 (p-value) Silica (SiO 2 ) mg/l < 100 Phosphate (P 2 O 4 ) 3 mg/l 5-10 Sodium sulphite (Na 2 SO 3 ) 3 mg/l 5-10 Iron mg/l < 0.2 Copper mg/l < 0.1 1 Previously specified in dh, conversion: 1 mmol/l = 5.6 dh (German hardness) 2 Previously specified as p-value, silica conversion 8.2 1 = p-value 1 3 Proof only required if respective dosing chemicals are used. The following value does not have to be verified constantly during plant operation: silica (SiO 2 ) of the heating surfaces, the values in the table below must not be exceeded. These values are calculated in relation to the boiler output (the smallest individual boiler in the case of multiple boiler systems) and the water content of the system. The total quantity of water used to fill and top up the system during the boiler s life must not exceed a value equivalent to three times the water content of the system. Water quality Heating water: Combustion air European standard BSEN 14868:2005 and VDI A suitable supply of combustion air must be guideline 2035 must be observed. Particular note guaranteed. It must not be possible to close the air must be taken of the following regulations. supply opening. Hoval boilers and water heaters are suitable for Minimum free area for the air supply opening at heating systems without significant oxygenation low level is 4cm 2 per 1kW boiler input. (system type 1 in accordance below with BSEN Minimum free area for the air supply opening at 14868:2005). high level is 2cm 2 per 1kW boiler input. Systems with; Continuous oxygenation (e.g. floor heating without diffusion-proof plastic pipes) or, Flue gas system Intermittent oxygenation (e.g. frequent Flue systems must comply with current topping up required) must be fitted with a British Standards and legislation. system separator. The flue must be pressure tight, able to withstand slight positive over pressure. Treated heating water must be checked at least once per year or more frequently as specified by the inhibitor manufacturer. Flue system must be able to cope with flue If, in the case of existing systems (e.g. boiler gas temperatures up to 190 C. replacement), the water quality of the existing The flue should be able to withstand the heating water complies with VDI 2035, it is not mildly acidic nature of any condensate that recommended that the system be refilled. VDI might form. Any condensate should not be 2035 also applies to top-up water. allowed to collect in the flue and should be Before filling new systems, or, if applicable, drained via a suitable trapped drain not existing systems, the heating system must be professionally cleaned and flushed. The heating back via the boiler. system must be flushed before the boiler is filled. A flue gas sampling point with an internal diameter Components of the boiler / heat exchanger that 10-21mm should be included adja- come into contact with water are made of ferrous cent to the flue spigot, extending through material. any thermal insulation. Due to the risk of stress corrosion cracking, the The pressure condition at the boiler spigot combined chloride, nitrate and sulphate content ideally should be balanced It can be slightly negative (up to -50Pa) or slightly positive of the heating water must not exceed a total of 200mg/l. Once the heating has been in operation for 6 12 depending on the matched burner. Check weeks, the ph value of the heating water should with Hoval Technical. be between 8.3 and 9.5. A draught stabiliser may be required if the Water for filling and topping up the system: draught exceeds the figure indicated. Untreated drinking water is generally most suitable < 2D for filling and topping up a system with a Hoval boiler. However, the water quality of the untreated drinking water must always comply with VDI 2035 D or must be demineralised and/or treated with inhibitors. The specifications of BSEN 14868:2005 2 x D 1D must be observed. In order to maintain the boiler s high efficiency level and to avoid overheating of the heating Flue gas surfaces, the values in the table below must not test point be exceeded.in order to maintain the boiler s D high efficiency level and to avoid overheating Table 1: Standard values for boiler and circuit water for circulation boiler (shell boiler) Burner mounting When mounting the burner an adapter flange may be required depending on the burner being used. If this is required this will be fitted to the boiler door and supplied with all additional fixings before it is dispatched from Hoval. The flexible oil pipes or gas pipework should be installed in such a manner that the door can be opened 90 with the burner still attached. All services must be fitted in such a manner that the boiler door can be opened fully. Electrical connection A single phase 230V supply is required for the control panel operation. Single phase burners are electrically supplied via the control panel. Three phase burners require a separate three phase isolated supply (by the installer) direct to the burner. In this case control cables fitted with wieland plug/ sockets will still run between the control panel and the burner. All power supplies to the burner/boiler/ other associated equipment (ie.: gas booster, separate oil pump, etc.) Noise attenuation The following steps can be taken to reduce noise: Make the walls, ceiling and floor of the boiler plant room as solid as possible, fit sound absorbers in the air supply ducting, provide conduit supports and brackets with sound dampening fittings. If there are living quarters either above or below the boiler plant room, fit rubber vibration strips underneath the base channels of the boiler and connect conduits flexibly with flexible connections. Connect circulating pumps to the network with flexible connections. In order to dampen flame noise in the flue, sound absorbers can be fitted in the flue system (consider leaving space for subsequent installation). Boiler start up from cold It is important to minimise the amount of condensate generated within the boiler during start-up from cold. The boiler should therefore only be allowed to circulate through local pipework until the return temperature is at least 55 C, before progressively allowing flow out to the system. A means of back-end (or return temperature) protection should be provided for each boiler to ensure minimum return temperature requirements are met. (not provided by Hoval) Important! A condensate trap must be fitted on the boiler flue outlet to prevent condensate entering the boiler. A condensate drain point is provided in the flue outlet smoke box and this should be piped to drain via a drain trap to prevent flue gases escaping. No isolating valve should be fitted in this pipework. Hydraulic Integration (Max-3 condens E boilers) If the flue gas condensing heat exchanger is integrated into a separate control and/or pump circuit, this must be equipped with at least a safety thermostat (installed directly downstream of or in the water outlet from the flue gas heat exchanger) and a safety valve. This equipment with a safety valve particularly applies if this circuit is designed so that it can be shut off. November 2017 - Rev 01 225

CompactGas (700-4200) DESCRIPTION Hoval CompactGas Economical Super High Efficiency Low heating costs due to 96.5% efficiency rating Efficient fuel usage due to modulating burner technology and integrated Alufer technology Low emissions due to clean combustion Ecological Clean combustion offering low NOx outputs less than 80mg/kWh Lower CO 2 emissions due to minimal gas consumption Easy to Use Simple Maintenance Less cleaning required due to clean combustion Easy to use due to intelligent design details User Friendly touchscreen TopTronic E controller Versatile Option Space saving due to compact design Sophisticated Time saving installation due to flexible connection options Large range of applications due to flexible combination options. Chequer plate top significantly eases installation in a boiler room Flue outlet at the front of the boiler, for space saving installation Flue gas collector Large furnace chamber for optimal and clean combustion alufer heat exchanger ensures an excellent, uniform heat transmission and low flue gas temperatures Pivoting front door for simple cleaning and easy accessibility to the combustion chamber. 226 November 2017 - Rev 01

CompactGas (700-4200) DESCRIPTION Featuring our patented alufer heat exchanger Hoval alufer technology The internationally patented alufer tube is a Hoval innovation in advanced heat transfer technology. It is constructed from an inner aluminium surface, heat shrunk within an outer carbon steel tube. The exceptional efficiency of the heat transfer is attributed to the following factors: The surface area for heat transfer is increased by a factor of five. High heat conductivity of aluminium being ten times greater than that of steel Optimised turbulence and heat exchange efficiency created by the multiple flow channels on the inner surface of the tube The CompactGas boiler is only suitable for firing with natural gas User-friendly operation The completely pivoting front door and the accessibility from the front significantly ease maintenance work and boiler and chimney cleaning. Large water capacity energy efficiency The large water capacity of the boiler allows for continuous operation of the burner and fewer starts. This significantly reduces gas consumption. Sophisticated management for your heating system The TopTronic control is the brain of every Hoval system. Innovative microprocessor technology ensures smooth and continuously monitored operation. The LCD display provides information on operating data, while a single rotary pushbutton and seven keys are used to activate heating programs and settings. If manual intervention is necessary, the required program can be found in seconds in the self-explanatory user guide. November 2017 - Rev 01 227

CompactGas (700-4200) TECHNICAL DATA Type (700) (1000) (1400) (1800) (2200) (2800) Nominal output at 80/60 C 4 kw 700 1000 1400 1800 2200 2800 Range of output at 80/60 C kw 250-700 300-1000 420-1400 540-1800 660-2200 840-2800 Burner input maximum kw 725 1037 1458 1865 2280 2901 Maximum working temperature 1 C 105 105 105 105 105 105 Minimum working temperature C 75 75 75 75 75 75 Minimum boiler return temperature C 35 35 35 35 35 35 Safety temperature limiter setting (water side) 2 C 120 120 120 120 120 120 Working/test pressure bar 6/9 6/9 6/9 6/9 6/9 10/16 Boiler efficiency at full load at 80/60 C (net calorific value/gross calorific value) % 96.5/87.0 96.4/86.9 96.0/86.5 96.5/87.0 96.5/87.0 96.5/87.0 Efficiency at partial load 30% (EN 303) (net calorific value/gross calorific value) % 97.4/87.7 97.4/87.7 97.3/87.7 97.4/87.7 97.5/87.8 97.5/87.8 Standard efficiency 75/60 C (according to DIN 4702 part 8) (net calorific value/gross calorific value) % 97.4/87.7 97.4/87.8 97.1/87.5 97.5/87.9 97.5/87.9 97.5/87.9 Stand-by loss at 70 C Watt 850 1000 1200 1350 1550 1800 Flue gas temperature at nominal output at 80/60 C C 94 101 102 99 93 92 Flue gas resistance at nominal output 10.5% CO 2 natural gas 500 m over sea level (Tolerance ± 20%) mbar 4.9 4.8 4.7 5.7 6.5 7.2 Flue gas mass flow at nominal output 10.5% CO 2 natural gas kg/h 1133 1623 2271 2923 3571 4546 Flow resistance boiler 3 z-value 0.012 0.012 0.003 0.003 0.003 0.002 Water flow resistance at 20 K mbar 10.8 22.0 10.8 17.9 26.7 28.8 Water flow volume at 20 K m³/h 30.0 42.9 60.0 77.1 94.3 120.0 Boiler water content litres 670 1130 1580 2020 2534 2844 Insulation thickness boiler body mm 80 80 80 80 80 80 Weight (incl. casing) 6 bar kg 1390 2100 2794 3500 4455 5567 Weight (without casing) 6 bar kg 1250 1960 2654 3200 4105 5167 Heating surface m² 36.52 44.23 68.49 89.51 117.26 142.34 Combustion chamber dimension Ø inside x length mm 584/1835 684/1985 830/2180 830/2301 830/3076 922/3272 Combustion chamber volume m³ 0.492 0.729 1.179 1.244 1.663 2.222 Dimensions see Dimensions 1 Limited by the boiler control panel E13.4 to 90 C and 13.5 105 C. 2 Maximum safety temperature for boiler control panel E13.4:110 C and for E13.5:120 C 3 Flow resistance boiler in mbar = volume flow (m 3 /h) 2 x z 4 The CompactGas boiler is only suitable for firing with natural gas For Engineering information please refer to page 205 which is also applicable to the CompactGas boiler 228 November 2017 - Rev 01

CompactGas (700-4200) TECHNICAL DATA Type (3500) (4200) Nominal output at 80/60 C 5 kw 3500 4200 Range of output at 80/60 C kw 1050-3500 1260-4200 Burner input maximum kw 3626 4 4351 4 Maximum working temperature 1 C 105 105 Minimum working temperature C 75 75 Minimum boiler return temperature C 35 35 Safety temperature limiter setting C (water side) 2 120 120 Working/test pressure bar 10/16 10/16 Boiler efficiency at full load at 80/60 C (net calorific value/gross calorific value) % 96/86,5 4 96/86,5 4 Efficiency at partial load 30% (EN 303) (net calorific value/gross calorific value) % 97/87,3 4 97/87,3 4 Standard efficiency 75/60 C (according to DIN 4702 part 8) (net calorific value/gross calorific value) % 97/87,4 4 97/87,4 4 Stand-by loss at 70 C Watt 2180 4 2290 4 Flue gas temperature at nominal output at 80/60 C C 93 4 94 4 Flue gas resistance at nominal output 10.5% CO 2 natural gas 500 m over sea level (Tolerance ± 20%) mbar 7,9 4 8,5 4 Flue gas mass flow at nominal output 10.5% CO 2 natural gas kg/h 5665 4 6798 4 Flow resistance boiler 3 z-value 0,002 4 0,002 4 Water flow resistance at 20 K mbar 32 4 33,8 4 Water flow volume at 20 K m³/h 150 4 180,6 4 Boiler water content litres 3553 4 3628 4 Insulation thickness boiler body mm 80 80 Weight (incl. casing) 6 bar kg 7980 4 8200 4 Weight (without casing) 6 bar kg 7580 4 7800 4 Heating surface m² 178,33 217,21 Combustion chamber dimension Ø inside x length mm 1050/2998 1050/3308 Combustion chamber volume m³ 2,596 2,88 Dimensions see Dimensions 1 Limited by the boiler control panel E13.4 to 90 C and E13.5 to 105 C 2 Maximum safety temperature for boiler control panel E13.4:110 C and for E13.5=120 C 3 Flow resistance boiler in mbar = volume flow (m 3 /h) 2 x z 4..The values have been calculated resp. interpolated. They must be verified by means of tests. 5 The CompactGas boiler is only suitable for firing with natural gas For Engineering information please refer to page 205 which is also applicable to the CompactGas boiler November 2017 - Rev 01 229

CompactGas (700-4200) TECHNICAL DATA Flue gas output diagram 105 100 1000 1400 1800 2200 2800 Flue gas temperature ( C) 95 90 85 700 3500 4200 80 75 For guidance only kw = Boiler output C = Flue gas temperature on clean surface, boiler flow temperature 80 C, return temperature 60 C (in accordance with DIN 4702). 1.1.1 Flue gas resistance 9.0 8.0 70 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 Nominal output (kw) Operated with natural gas H, λ = 1,15 with max. burner output (CO 2 natural gas H = 10,5 %) A reduction of the boiler water temperature of -10 K causes a reduction of the flue gas temperature of approx. 6-8 K. A modification of lambda λ of ± 0,09 causes a modification of the flue gas temperature of ± 8 K. 3500 4200 7.0 2200 2800 Flue gas resistance (mbar) 6.0 5.0 4.0 3.0 700 1000 1400 1800 2.0 1.0 0.0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 For guidance only Boiler output (kw) 230 November 2017 - Rev 01

CompactGas (700-4200) DIMENSIONS Type a b c d e f g h i k (inside) (700) 1100 1150 1175 591 250 290 330 4xM12 15 /45 303 (1000) 1280 1330 1384 710 310 350 400 6xM12 15 353 (1400) 1480 1530 1584 810 330 400 450 6xM16 15 403 (1800) 1580 1630 1684 860 360 400 450 6xM16 15 453 (2200) 1580 1630 1684 860 360 400 450 6xM16 15 453 (2800) 1680 1730 1784 910 360 400 450 6xM16 15 503 (3500) 1850 1928 1995 1018 360 400 450 6xM16 15 553 (4200) 1850 1928 1995 1018 360 400 450 6xM16 15 603 Type l * m n o p q r s t u v w (700) 1436 2229 240 1930 389 1110 170 1271 96 1406 420 31 (1000) 1646 2430 240 2130 438 1210 170 1487 103 1564 500 31 (1400) 1886 2600 240 2300 438 1350 170 1708 124 1780 550 31 (1800) 2038 2790 257 2438 438 1350 187 1808 124 1884 600 48 (2200) 2038 3529 257 3213 438 2125 187 1808 124 2659 600 48 (2800) 2188 3745 257 3430 638 2100 187 1908 124 2799 600 48 (3500) 2398 3905 337 3510 668 2123 236 2121 126 3141 600x600 65 (4200) 2398 4205 337 3810 668 2423 236 2121 126 3441 600x600 65 * with Condensate trap: + 155 mm A condensate trap must be fitted at the flue gas outlet to prevent condensation entering the boiler Opening the boiler door boiler door opens to the right or left (dimensions in mm)) 1 Flow (700) DN 125, PN6 (1000) DN 125, PN6 (1400) DN 150, PN6 (1800) DN 150, PN6 (2200) DN 150, PN6 (2800) DN 200, PN 10 (3500) DN 200, PN 10 (4200) DN 200, PN 10 2 Return (700) DN 125, PN6 (1000) DN 125, PN6 (1400) DN 150, PN6 (1800) DN 150, PN6 (2200) DN 150, PN6 (2800) DN 200, PN10 (3500) DN 200, PN10 (4200) DN 200, PN10 3 Flue gas outlet 4 Draining R 1½ 5 Condensate drain D31/25 mm (on both sides) 6 Electrical connection (on both sides) 7 Control panel (optionally on the left or right hand side) 8 Sleeve Rp ¾ with immersion pocket for boiler temperature sensor CompactGas Type a b (700) 875 120 (1000) 1052 120 (1400) 1252 120 (1800) 1337 120 (2200) 1337 120 (2800) 1435 120 (3500) 1700 160 (4200) 1700 160 November 2017 - Rev 01 231

CompactGas (700-4200) DIMENSIONS Dimensions without insulation and casing Boiler incl. boiler door, outlet without flue gas condensate trap (dimensions in mm) Type a b * c d e f g h i k (inside) (700) 1100 1436 1153 590 250 290 330 6xM12 15 303 (1000) 1280 1646 1363 710 310 350 400 6xM12 15 353 (1400) 1480 1886 1563 810 330 400 450 6xM16 15 403 (1800) 1580 2038 1663 860 330 400 450 6xM16 15 453 (2200) 1580 2038 1663 860 330 400 450 6xM16 15 453 (2800) 1680 2188 1763 910 330 400 450 6xM16 15 503 (3500) 1850 2398 1995 1018 360 400 450 6xM16 15 553 (4200) 1850 2398 1995 1018 360 400 450 6xM16 15 603 Type l m n o p q r s t DN (700) 80 2212 209 1930 389 1110 84,5 1271 180 125 (1000) 80 2423 209 2130 438 1210 96 1487 180 125 (1400) 80 2593 209 2300 438 1350 112 1708 200 150 (1800) 80 2731 209 2438 438 1350 112 1808 200 150 (2200) 80 3506 209 3213 438 2125 112 1808 200 150 (2800) 80 3723 209 3430 638 2100 112 1908 200 200 (3500) 80 3820 315 3450 668 2123 135 2121 200 200 (4200) 80 4111 315 3760 668 2423 135 2121 200 200 Combustion chamber dimensions Typ A B C D E (700) 219 1644 1835 584 189 (1000) 219 1748 1985 684 189 (1400) 219 1896 2180 830 189 (1800) 219 1998 2301 830 189 (2200) 219 2773 3076 830 189 (2800) 219 2968 3288 922 189 (3500) 280 3300 3637 1050 256 (4200) 280 3300 3637 1050 256 232 November 2017 - Rev 01

CompactGas (700-4200) TYPICAL HYDRAULIC SCHEMATIC Notes : This hydraulic schematic is to be used for indicative purposes only. It does not contain all required items for the installation. The installation must comply with all relevant regulations. For underfloor heating, a flow temperature limiter must be installed. Safety valves must be fitted directly to the boilers (with no isolation valve). Lock shield valves must be used for the expansion vessel. Anti-thermal siphon loops must be installed to ensure natural circulation is not present. Pressure limiter (in accordance with BSEN12828 clause 4.6.2.2.2 - Heating Systems In Buildings). All CompactGas models should have an associated pressure limiter device fitted in the system pipework, as close as possible to the boiler itself (provided by the installer - not supplied, fitted or wired by Hoval). If the operating pressure of the heating system exceeds the given pressure limit, or in the case of auxiliary power interruption, the pressure limiter shall shut off the heating equipment and interlock against it restarting. The pressure limiter shall be adjusted so that it responds before the safety valve(s) operate. Not shown on these schematics. TTE-WEZ TopTronic E basic module heat generator (installed) VF1 Flow temperature sensor 1 B1.1 Flow temperature limit thermostat (if required) MK1 Pump mixer circuit 1 YK1 Actuator mixer 1 YKR Actuator, return mixer AF Outdoor sensor SF Calorifier sensor RLF Return sensor DKP Pump for heating circuit without mixer SLP Calorifier loading pump KKP Boiler circuit pump Optional RBM TTE-GW TopTronic E room control module TopTronic E Gateway TTE-FE HK TopTronic E module expansion heating circuit VF2 Flow temperature sensor 2 B1.2 Flow temperature limit thermostat (if required) MK2 Pump mixer circuit 2 YK2 Actuator mixer 2 November 2017 - Rev 01 233

Hoval at Burj Khalifa, UAE Niovember 2017 - Rev 01

SR-plus (500-3710 kw) DESCRIPTION Hoval SR-plus Economical Ecological Saving Energy Cost-efficient solution due to low investment cost Best effectiveness due to spiral retarders fitted on the gas side Low impact on the environment Environmentally friendly due to low NOx emissions Lower CO 2 emissions due to minimal fuel consumption Easy to Use Simple Maintenance Service friendly due to easy front door access Easy to use due to intelligent design details User Friendly touchscreen TopTronic E controller Versatile Option Space saving due to compact design Simple installation due to high flexibility in positioning Sophisticated User-friendly operation Flue gases pass to a rear mounted flue outlet box and horizontal flue outlet. The flue outlet has a spigot for connecting to the installers flue pipe, and is fitted with a door for cleaning and access. Operating Conditions The SR-plus is tested and manufactured to European boiler design codes and is offered in outputs from 500 to 3710kW. The boilers are suitable for working pressures up to 8 bar and operating temperatures to a maximum of 105 o C. On special request SR-plus boilers are available to model 3000 in accordance with BS855 PED for operation up to 132 o C and 4.5 bar operating pressure. SR-H plus boilers are also available including to model 4000 in accordance with BSEN12953 PED for operation up to 150 o C and 10 bar operating pressure. Intelligent command centre for your heating system All SR-plus boilers are supplied with a side-mounted TopTronic E/E13.5 control panel. This is mounted on the right hand side of the boiler as standard. The integral TopTronic E Controller provides for control of the gas, oil or dual fuel burner and as an optional extra can sequence up to eight boilers. Optional TopTronic E modules can also be fitted in the control panel depending on system requirements. Clean combustion Burners The boilers are of mild steel welded construction in which the outer shell forms a water space around the combustion chamber. The final pass water jacketed gas passage ways with plain smoke tubes and spiral retarders provide an effective secondary heating surface. With the proven three-pass technique, the hot combustion gases are immediately moved out of the high-temperature zone. The flame temperature is reduced, and the pollutant emissions are minimised. The SR-plus is suitable for operation with a range of matched burners for use with oil, gas, dual fuel or biogas. It is Hoval policy to supply boilers with matched burners from several recognised manufacturers. (Please see note 6 on page 237 regarding MCP variants) Details of gas pressures, noise levels, acoustic shrouds etc. are given on individual quotations. July 2018 - Rev 02 235

SR-plus (500-3710 kw) DESCRIPTION Insulated hinged front door Doors can be hinged on either side Large combustion chamber Helps reduce NOx emissions TopTronic E/E13.5 Control Panel Mounted on the right hand side of the boiler as standard Chamber glass Features a combustion chamber Generous water volume Permits no minimum water flow rate Plain smoke tubes and spiral retarders Reduce laminar flow and increase efficiency Fully insulated combustion chamber For minimal standing losses Technical data (500) (600) (700) (1000 MCP) (1300 MCP) Output range at high fire kw 500 600 750 950 1220 Maximum operating temperature (1) o C 105 Maximum operating pressure bar 8 Water content litre 800 770 1340 1250 1320 Dry Boiler Weight (2,3) kg 1734 1789 2530 2668 3417 Dimensions W/H/L (4) mm 1290/1435/2398 1465/1590/2883 1555/1677/2986 1615/1765/2981 Technical data (1750 MCP) (2000 MCP) (2250 MCP) (2500 MCP) (3000 MCP) (3500 MCP) (4000 MCP) Output range at high fire kw 1687 1866 2120 2468 3000 3355 3710 Maximum operating temperature (1) o C 105 Maximum operating pressure bar 8 Water content litre 2150 2690 3350 3660 3670 4020 4130 Dry Boiler Weight (2,3) kg 4521 5410 6213 6634 7177 9128 11067 Dimensions W/H/L (4) mm 1765/1940/ 3433 1865/2048/ 3468 2015/2212/ 3576 2115/2295/ 3651 2195/2420/ 3726 2365/2630/ 4226 2535/2700/ 4251 (1) Based on a maximum limit thermostat setting of 120 C. Subject to modification (2) Excludes burner. Weights shown are for the 8 bar boiler (3) Width includes for side mounted control panel. (4) On special request boilers are available, in accordance with BS855PED, for operation up to 132 C with 4.5 bar operating pressure to model 3000 only. (5) SR-H plus boilers are also available in accordance with BS EN12953 PED for operation up to 150 C and 10 bar operating pressure (including model 4000). For detailed technical information please refer to separate manual 236 July 2018 - Rev 02

SR-plus (500-3710 kw) TECHNICAL DATA Type (500) (600) (700) (1000 MCP) (1300 MCP) Maximum Output kw 500 600 750 950 1220 Minimum Output kw 225 300 375 525 650 Burner input at maximum output kw 546 657 819 1039 1339 Burner input at minimum output kw 241 322 402 561 697 Maximum boiler operating temperature 1 C 105 105 105 105 105 Minimum return temperature (oil/gas) C 60/55 60/55 60/55 60/55 60/55 Minimum flue gas temperature C 140 140 140 140 140 Maximum working pressure bar 8 8 8 8 8 Boiler efficiency nett 2 at 100%PN % 91.5 91.4 91.6 91.4 91.1 at 30%PN % 93.5 93.1 93.4 93.5 93.3 Standing losses at qb at 70 C Watt 1250 1500 1725 1710 2318 Insulation thickness mm 100 100 100 100 100 Fuel Consumption at maximum output Nat Gas 3 m 3 /hr 57.0 68.4 85.5 108.3 139.1 35 seconds oil 4 litres/hr 55.7 66.9 83.6 105.9 136.0 Hydraulic resistance through the boiler 5 z-factor 0.020 0.020 0.010 0.011 0.009 Hydraulic resistance with 11 K ΔT m bar 30.6 44.0 34.4 60.7 81.8 Hydraulic resistance with 20 K ΔT m bar 9.3 13.3 10.4 18.3 24.8 Water Flow rate with 11 K Δ m 3 /hr 39.1 46.9 58.6 74.3 95.4 Water Flow rate with 20 K Δ T m 3 /hr 21.5 25.8 32.2 40.8 52.4 Boiler water content litres 800 770 1340 1375 1382 Dry Weight (without burner) kg 1734 1789 2530 3322 3614 Type (1750 MCP) (2000 MCP) (2250 MCP) (2500 MCP) (3000 MCP) (3500 MCP) (4000 MCP) Maximum Output kw 1687 1866 2120 2468 3000 3355 3710 Minimum Output kw 880 1025 1175 1325 1500 1750 2075 Burner input at maximum output kw 1852 2042 2322 2709 3286 3679 4072 Burner input at minimum output 945 1101 1261 1419 1603 1872 2226 Maximum boiler operating temperature 1 C 105 105 105 105 105 105 105 Minimum return temperature (oil/gas) C 60/55 60/55 60/55 60/55 60/55 60/55 60/55 Minimum flue gas temperature C 140 140 140 140 140 140 140 Maximum working pressure bar 8 8 8 8 8 8 8 Boiler efficiency nett 2 at 100%PN % 91.1 91.4 91.3 91.1 91.3 91.2 91.1 at 30%PN % 93.1 93.1 93.2 93.4 93.6 93.5 93.2 Standing losses at qb at 70 C Watt 2475 2510 2530 2570 2960 3070 3160 Insulation thickness mm 100 100 100 100 100 100 100 Fuel Consumption at maximum output Nat Gas 3 m 3 /hr 192.4 212.8 241.7 281.4 342.1 382.6 423.1 35 seconds oil 4 litres/hr 188.1 208.0 236.3 275.1 334.4 374.0 413.6 Hydraulic resistance through the boiler 5 z-factor 0.008 0.006 0.006 0.0015 0.0015 0.0015 0.0017 Hydraulic resistance with 11 K ΔT m bar 139.1 127.6 164.8 55.8 82.5 103.2 143.0 Hydraulic resistance with 20 K ΔT m bar 42.1 38.6 49.8 16.9 25.0 31.2 43.2 Water Flow rate with 11 K Δ m3/h 131.9 145.9 165.7 192.9 234.5 262.2 290.0 Water Flow rate with 20 K Δ T m3/ 72.5 80.2 91.1 106.1 129.0 144.5 159.5 Boiler water content litres 2150 2690 3350 3660 3670 4020 4130 Dry Weight (without burner) kg 4521 5410 6213 6634 7177 9128 1067 (1) Based on a maximum limit thermostat setting of 120 o C. (2) Boiler efficiencies at 100% load are based on a mean operating temperature of 70 o C, at 30% efficiencies are based on a mean temperature of 50 o C. (3) Based on gross CV 38.5 MJ/m 3. (4) Based on gross CV 45.5 MJ/kg and specific gravity 0.835. (5) Hydraulic resistance (mbar) = (Flow rate (m 3 /h)) 2 x z Figures are based on the maximum boiler outputs. (6) MCP variants comply with the Medium Combustion Plant Directive which comes into effect on the 20th December 2018. Suitable for Gas firing only. Oil only suitable as a stand-by fuel burner, and its use must be limited to less than 500 run hours per annum. July 2018 - Rev 02 237

SR-plus (500-700) DIMENSIONS & TECHNICAL INFORMATION Control panel can be mounted on left or right hand side. (Standard right hand side). 1 3 C 2 G 560 H B 165 J M 9 N 7 5 A 10 L E 6 8 4 Front view F D Side elevation view Note: The installer must ensure the condensate drain connection (8) is piped to drain via a drain trap to prevent flue gases escaping. Do not fit an isolation valve in this pipework. As well as the safety valve, the installer must provide i) for a pressurised system - an automatic air vent. ii) for an open vented system - a vent from the flow line. 1 Flow 2 Return 3 Safety valve connection 4 Hydraulic drain 5 Flue outlet 6 Smokebox cleaning door 7 Flue gas test point 8 Smokebox condensate drain 9 Boiler control panel 10 Burner mounting flange A single phase 230V supply is required for the control panel operation. Single phase burners are electrically supplied via the control panel. Three phase burners require a separate three phase isolated supply (by the installer direct to the burner, incorporating a flexible connection to allow for boiler/burner door opening. A separate control cable is fitted with wieland plug/sockets to run between the control panel and the burner. All power supplies to the boiler/ burner/other associated equipment (ie: gas booster, separate oil pump, etc.) should be isolated via the same switched isolator. SRplus Model kw Rating at high fire A B C D E F G H J L M N Flow/return flanged to BS4504 PN16 Safety valve Flue I/D Dry Weight kg Water Content litres 500 500 1247 1125 2398 1886 675 208 1320 920 280 675 188 73 100 N/B R 1" 250 1734 800 600 600 1247 1125 2398 1886 675 208 1320 920 280 675 188 73 100 N/B R 1" 250 1789 770 700 750 1415 1300 2883 2338 760 238 1780 1330 365 760 175 60 125 N/B R 1 1/4 " 300 2530 1340 238 July 2018 - Rev 02

SR-plus (1000 MCP - 4000 MCP) DIMENSIONS 560 1 Control panel can be mounted on left or right hand side. (Standard right hand side). 3 2 C G H B 165 J N M 9 7 5 A 10 L E 6 Front view E D Side elevation view 8 4 Note: The installer must ensure the condensate drain connection (8) is piped to drain via a drain trap to prevent flue gases escaping. Do not fit an isolation valve in this pipework. As well as the safety valve, the installer must provide i) for a pressurised system - an automatic air vent. ii) for an open vented system - a vent from the flow line. 1 Flow 2 Return 3 Safety valve connection 4 Hydraulic drain 5 Flue outlet 6 Smokebox cleaning door 7 Flue gas test point 8 Smokebox condensate drain 9 Boiler control panel 10 Burner mounting flange Please see note 6 on page 237 regarding the MCP variants below A single phase 230V supply is required for the control panel operation. Single phase burners are electrically supplied via the control panel. Three phase burners require a separate three phase isolated supply (by the installer direct to the burner, incorporating a flexible connection to allow for boiler/burner door opening. A separate control cable is fitted with wieland plug/sockets to run between the control panel and the burner. All power supplies to the boiler/ burner/other associated equipment (ie: gas booster, separate oil pump, etc.) should be isolated via the same switched isolator. SR-plus Model kw Rating at high fire A B C D E F G H J L M N Flow/Return flanged to BS4504 PN16 Safety valve Flue I/D Dry Weight kg Water Content litres 1000 MCP 1300 MCP 1750 MCP 2000 MCP 2250 MCP 950 1495 1390 2986 2356 815 236 1795 1345 380 815 182 67 125 N/B R 1 1/2 350 3322 1375 1220 1575 1450 2981 2351 850 236 1806 1356 466 850 190 75 150 N/B R 1 1/2 400 3614 1382 1687 1752 1600 3433 2803 950 236 2137 1687 500 950 188 73 150 N/B R 2 400 4521 2150 1866 1850 1700 3468 2803 1000 271 2137 1687 590 1000 190 75 150 N/B R 2 450 5410 2690 2120 2020 1850 3576 2911 1095 271 2200 1750 590 1095 195 80 150 N/B R 2 450 6213 3350 2500 MCP 2468 2100 1950 3651 2986 1135 271 2372 1922 600 1135 195 80 200 N/B 65N/B PN16 450 6634 3660 3000 MCP 3000 2220 2030 3726 3061 1200 271 2502 2052 600 1200 190 75 200 N/B 65N/B PN16 500 7177 3670 3500 MCP 3355 2440 2200 4226 3651 1330 271 2706 2166 866 1330 193 78 200 N/B 65N/B PN16 500 9128 4020 4000 MCP 3710 2525 2370 4251 3586 1330 271 2716 2216 866 1330 178 63 200 N/B 65N/B PN16 550 11067 4130 July 2018 - Rev 02 239

SR-H plus (500-800 & 1750 MCP - 4000 MCP) DIMENSIONS Control panel can be mounted on left or right hand side. (Standard right hand side). 1 3 C 2 G 560 H B 165 J L M 9 N 7 5 10 E 6 F Rear view D 8 4 Side elevation view Note: The installer must ensure the condensate drain connection (8) is piped to drain via a drain trap to prevent flue gases escaping. Do not fit an isolation valve in this pipework. As well as the safety valve, the installer should provide; i) For a pressurised system - an automatic air vent. ii) For an open vented system - a vent from the flow line. 1 Flow 2 Return 3 Safety valve connection 4 Hydraulic drain 5 Flue outlet 6 Smokebox cleaning door 7 Flue gas test point 8 Smokebox condensate drain 9 Boiler control panel supplied seperately for fitting and wiring by the installer Please see note 6 on page 237 regarding the MCP variants below A single phase 230V supply is required for the control panel operation. Single phase burners are electrically supplied via the control panel. Three phase burners require a seperate three phase isolated supply (by the installer direct to the burner, incorporating a flexible connection to allow for boiler/burner door opening. A separate control cable is fitted with wieland plug/sockets to run between the control panel and the burner. All power supplies to the boiler/burner/ other associated equipment (i.e.: gas booster, separate oil pump, etc.) should be isolated via the same switched isolator. SR-H plus Model kw Rating at high fire A B C D E F G H J L Flow/ Return flanged to BS4504 PN16 Safety valve flanged to BS4504 PN16 Drain flanged BS4504 PN16 Flue I/D Dry Weight kg Water Content litres 500 500 1425 1200 2335 1625 1100 325 1500 1175 325 800 100NB 25NB 40NB 250 1924 880 600 625 1477 1260 2635 1925 1150 325 1825 1475 325 800 100NB 25NB 40NB 250 2129 1132 800 800 1627 1480 2905 2195 1250 325 2000 1600 350 927 150NB 32NB 40NB 300 3050 1745 1750 MCP 2000 MCP 2500 MCP 3000 MCP 4000 MCP 1705 2100 1850 3465 2655 1600 325 2335 1985 525 1190 150NB 40NB 40NB 400 4795 2511 1819 2200 1950 3572 2762 1650 325 2335 1985 525 1240 150NB 50NB 40NB 450 6075 3515 2560 2440 2190 3754 2939 1880 330 2675 2075 575 1327 200NB 50NB 40NB 475 8134 5083 3000 2500 2300 3812 2997 1930 330 2650 2000 800 1327 200NB 50NB 40NB 500 9310 5560 3930 2660 2400 4246 3431 2195 330 3100 2637 825 1455 200NB 65NB 40NB 550 12145 6870 240 July 2018 - Rev 02

SR-plus (500-4000 MCP) TYPICAL HYDRAULIC SCHEMATIC Notes : These hydraulic schematics are to be used for indicative purposes only. They do not contain all required items for the installation. The installation must comply with all relevant regulations. For underfloor heating, a flow temperature limiter must be installed. Safety valves must be fitted directly to the boilers (with no isolation valve). Lock shield valves must be used for the expansion vessel. Anti-thermal siphon loops must be installed to ensure natural circulation is not present. Pressure limiter (in accordance with BSEN12828 clause 4.6.2.2.2 - Heating Systems In Buildings). All SR-plus models should have an associated pressure limiter device fitted in the system pipework, as close as possible to the boiler itself (provided by the installer - not supplied, fitted or wired by Hoval). If the operating pressure of the heating system exceeds the given pressure limit, or in the case of auxiliary power interruption, the pressure limiter shall shut off the heating equipment and interlock against it restarting. The pressure limiter shall be adjusted so that it responds before the safety valve(s) operate. Not shown on these schematics. SR-Plus TTE-WEZ TopTronic E basic module heat generator (installed) VF1 Flow temperature sensor 1 B1.1 Flow temperature limit thermostat (if required) MK1 Pump mixer circuit 1 YK1 Actuator mixer 1 YKR Actuator, return mixer AF Outdoor sensor SF Calorifier sensor RLF Return sensor DKP Pump for heating circuit without mixer SLP Calorifier loading pump KKP Boiler circuit pump Optional RBM TTE-GW TopTronic E room control module TopTronic E Gateway TTE-FE HK TopTronic E module expansion heating circuit VF2 Flow temperature sensor 2 B1.2 Flow temperature limit thermostat (if required) MK2 Pump mixer circuit 2 YK2 Actuator mixer 2 Jully 2018 - Rev 02 241

Hoval at Oxford University July 2018 - Rev 02