boilers. High efficiency heating combined with economic DHW generation. Boiler outputs from 00 to 0kW. DHW output to,00 litres per hour.
Where quality and reliability cannot be compromised, select the space-saving Cosmo Combination. With over fifty years experience, Hoval can supply a combination boiler to suit every application.
General The Hoval Cosmo Combination boiler couples the tried and tested technology of the Cosmo boiler with that of the Hoval CT-plus and Modul-plus (A type) calorifiers. Mounted above the boiler, the calorifier combines with the boiler to provide a fully integrated package. This includes DHW temperature control, pressure-jet burner suitable for firing on gas, oil or dual fuel and optional primary loading pump. Application Its compact design and flexibility are fundamental to the Cosmo Combination boiler, which is ideal for plantrooms with limited floor space or where there is a policy of decentralising boiler plant to point of use. But first and foremost the combination succeeds where there are peak demands for DHW e.g. hotels, leisure centres, canteens and military accommodation. It is here that the Cosmo Combination comes into its own, offering low cost installation in conjunction with optimum energy efficiency. Mix & Match Tailored, special combination packages, as for example, in the case of dedicated DHW generation, are available through Hoval Mix & Match packages. For mixed heating and DHW applications, please refer to technical data. Secondary outlet Primary inlet Design Both the Modul-plus and CT-plus calorifiers used in the construction of the Cosmo-Combination have high grade stainless steel inner vessel(s) with a rippled wall, surrounded by a mild steel primary water jacket. The CT-plus has one single cylinder whereas the Modul-plus is made from a series of interconnected cylinders. The cylinders are wrapped in an insulation blanket within the Cosmo Combination casing. For DHW generation, the Hoval patented rippled heat transfer surface:- gives rapid regeneration of secondary water tempertures even after complete draw off. provides an extended heat transfer surface within the compact cylinder. creates turbulence on both the primary and secondary water sides to enhance heat transfer and prevents dead legs. provides a low intensity, large heat transfer surface, which reduces scale formation. The inside wall self descales due to the expansion and contraction movement of the rippled surface. strengthens the inner cylinder, thus allowing it to run on unvented systems at pressures up to bar g as standard & 0 bar g for high pressure models. Modul-plus cylinder Primary outlet Secondary inlet Optional A listed primary pumps Energy efficient A listed primary pumps are available on request. A rated pumps consume up to % less energy than traditional pumps. Boiler Key Benefits No minimum water flow rate is required due to a large boiler water content. Unique third pass tube design for improved heat transfer rate on boiler. Boiler quality steel chamber and shell construction with heavy grade tubes. Standing losses typically 0.%. Hinged boiler door and bolt-on smoke box provides easy access for cleaning and maintenance. Suitable for use with a range of matched burners for firing on gas, oil or dual fuel. Extremely reliable offering both high efficiency performance together with low NOx emissions. Operating temperatures up to 00 C. Working pressure bar as standard. bar model available on request (only with A type calorifiers). Efficiency to 9% net. Controls All Cosmo Combinations are supplied with an integral control panel, which is mounted on the front of the unit where practical. Side-mounted control panels are avalable on request. Optional TopTronic control Alternatively Hoval TopTronic controller(s) can be specified, providing a simple user friendly operating platform that controls individual heating and hot water systems and optimises energy consumption. (See Separate leaflet for more details).
The space-saving Hoval Cosmo Combination offers an ideal solution to meet the heating and hot water demands of any hotel, sports centre, school, hospital or care home. Insulation litres DHW storage in each modul cylinder. High grade stainless steel rippled heat transfer surface Contra-flow of primary and secondary water for increased heat transfer. Carbon steel primary water jacket surrounding the DHW cylinder Each cylinder has an inspection opening for easy cleaning. Rotating turbulent flow stream increases heat transfer Generous water volume permits no minimum water flow rate Combustion chamber sight glass Pressure jet burner suitable for gas, oil or dual fuel. Large combustion chamber helps reduce NOx emissions Dimpled tubes reduce laminar flow and increase efficiency Fully insulated combustion chamber for minimal standing losses Doors can be hinged on either side. Picture shows Cosmo boiler with Modul-plus (A) calorifier. Hot water on tap. From large houses to luxury hotels the Cosmo Combination can efficiently produce both domestic hot water and heating from one space saving unit. With over fifty years experience producing the calorifiers and combination boilers, during which time Hoval have refined the design to make it extremely reliable and easy to maintain. The design is significantly more resistant to scaling than conventional calorifiers due to the large heat transfer surface area and subsequently low intensity across it. Helps protect against legionella or bacteria. All Cosmo Combination calorifiers work on the primary water jacket principle. Whereby the stainless steel cylinder containing the domestic hot water is surrounded by hot primary water from the Cosmo boiler. Thus, the temperatures at the inner wall of the stainless steel cylinder are only marginally lower than the primary medium temperature. So as the kill-time for micro-organism above 0 o C is instantaneous, the cultivation of a bio-film in which legionella or bacteria growth can occur is significantly reduced. With full turbulant flow and low hydraulic resistance through the unit there are no dead legs, this makes the Cosmo Combination the ideal solution for hospitals, homes for the aged, schools and health resorts, where the very highest levels of domestic hot water hygiene are required. Design. Central to the calorifier design is the rippled stainless steel DHW cylinder. The rippled cylinder increases heat transfer across the primary and secondary mediums. It also adds strength, so with a maximum secondary working pressure of bar g (as standard) makes it ideal for unvented DHW systems. In addition as the domestic hot water passes through the stainless steel cylinder the rippled surface promotes turbulence and so naturally destratifies the hot water (no dead legs). The low hydraulic resistance through both the primary and secondary sides of the calorifier also allows the water to circulate through the unit more freely.
Technical Data Cosmo Combination Cosmo Combination Boiler Model () 0 90 0 0 00 0 90 00 00 0 Nominal output () kw. 0.0 90. 0.00 0..0.00 0.00 0.00 90.00 0.00 00.00 0.00 Minimum output kw 00.00.00.00.00 90.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Boiler input at nominal output kw 9.....09 0. 9.. 99.9 0...9. Boiler input at minimum output kw 09.. 9. 0. 0..0..0.9 9.. 0. 9.9 Maximum boiler operating temperature C 00 00 00 00 00 00 00 00 00 00 00 00 00 Minimum return temperature (oil/gas) C 0/ 0/ 0/ 0/ 0/ 0/ 0/ 0/ 0/ 0/ 0/ 0/ 0/ Minimum flue gas temperature C 0 0 0 0 0 0 0 0 0 0 0 0 0 Maximum working pressure / test pressure () bar /9 /9 /9 /9 /9 /9 /9 /9 /9 /9 /9 /9 /9 Boiler efficiency net () at 00%PN % 9. 9. 9. 9. 9. 9. 9. 9. 9. 9. 9. 9. 9. at 0%PN % 9.9 9. 9. 9. 9. 9.9 9.0 9. 9. 9. 9. 9. 9. Standing losses qb at 0 C (9) Watt 00 00 00 900 00 00 00 00 00 000 000 00 00 Insulation thickness mm 0 0 0 0 0 0 0 0 0 0 0 0 0 Fuel Consumption at nominal output Nat Gas () m /hr 9...99 9....9 9. 9. 0...00.0 seconds oil () litres/hr 9.0.9.0.0.... 9. 0... 0. Hydraulic resistance through the boiler () z-factor 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.009 0.00 0.00 0.00 0.00 0.00 Hydraulic resistance with K T m bar.9.0...9...0....99. Hydraulic resistance with 0 K T m bar.....9 0.0 0.0. 0.. 0.9..0 Water Flow rate with K T m / h.....0...9...0 9.0. Water Flow rate with 0 K T m / h.0 0..0.0. 0.00. 0.. 0...9. Boiler water content litres 0 9 9 0 Dry Weight (without burner) () kg 0 9 0 9 9 9 00 0 Connections: Flow/Return # PN DN DN DN DN0 DN0 DN0 DN DN DN DN0 DN0 DN0 DN0 Flue (o/dia) mm 9 9 9 9 9 9 9 Cosmo Combination Calorifier Model () CT0 CT0 CT0 A A A A Water content Secondary (DHW) litres 0 0 0 0 90 90 0 Primary (calorifier only) litres 9 0 90 0 Max working pressure Secondary (DHW) bar g Primary () bar g... Test pressure Secondary (DHW) bar g 9 9 9 9 9 9 9 Primary () bar g....... DHW output () Peak (litres/0 mins) 0 0 0 00 0 0 Continuous (litres/ hour) 000 0 00 0 00 00 Calorifier primary load () kw 9 9 0 0 9 9 Primary flow rate l/s.....0. 0. Primary resistance mbar 0 0 9 Secondary flow rate l/s.0....0.. Secondary resistance mbar 0 0 0 0 0 Calorifier Weight Dry () kg 0 0 9 0 Fully Flooded () kg 9 900 Calorifier Standing losses @ 0 C (9) W 0 0 Maximum chloride content in DHW (0) mg/litre 00 00 00 00 00 00 00 Connections: Primary inlet and outlet # BSP/PN R./ ײ R./ ײ R./ ײ DN0 DN DN DN DHW Cold feed # BSP R./ ײ R./ ײ R./ ײ R ײ R ײ R ײ DN DHW flow # BSP R./ ײ R./ ײ R./ ײ R ײ R ײ R ײ DN DHW return BSP R./ ײ R./ ײ R./ ײ R ײ R ײ R ײ R ײ # All flanges on bar version will be PN. (Only suitable for high pressure A type calorifiers). () All boiler / calorifier combinations are available except where the calorifier primary load exceeds the nominal boiler output. () Refers to all standard Cosmo boilers, (maximum primary pressure is governed by the calorifier), a higher pressure version is available on request only with the A type calorifier, ( bar maximum primary operating pressure / bar test and 0 bar maximum secondary operating pressure bar test). () Boiler efficiencies at 00% load are based on a mean operating temperature of 0 o C. At 0%, efficiencies are based on a mean temperature of 0 o C. () Based on gross CV. MJ/m. () Hydraulic resistance (mbar) = (Flow rate (m /h)) x z () Dry weights based on the bar boiler, to calculate the weight of an bar version add 0%. For total dry weight add boiler to calorifier weight. () For total standing losses add boiler standing losses to that of the calorifier. (9) Chloride content up to 00mg/litre acceptable with the use of sacrificial anodes. (0) Outputs based on o C primary inlet, 0 o C cold feed and 0 o C DHW flow temps. () Based on gross CV. MJ/kg and specific gravity 0.. Model Example. The Model for the combination with a Cosmo and a CT0 is: Cosmo/CT0. Please refer to selection table for matching options. Model Example. The Model for the combination with a Cosmo 0 and a A is: Cosmo0/A. Please refer to selection table for matching options.
Dimensions and Technical Information Cosmo Combination boiler (models -0 with C type calorifiers) Where calorifier is longer than boiler, it will overhang at the front. 0 Burner & Flue C L d 0 a (calorifier) a (boiler) i 00 d k j b Calorifier primary pump, stool piece and pipework optional Left or right hand side mounted control panel optional. 0 c* 9 0 c* Boiler & calorifier are the same width. A drain valve should be installed in the DHW cold feed pipework between the unit and the isolation valve to facilitate draining down. For model options please refer to the separate selection table. e f h 0 g g 0 Flow Return Hydraulic drain Flue outlet Condensate drain R/ ײ Note: Automatic air vent G/ ײ Std control panel position Plugged vent connection 9. DHW flow 0. DHW cold feed. DHW return. Calorifier primary inlet. Calorifier primary outlet. Primary vent. Primary pump (Optional). Non-return valve (Optional). Flexible pipework (Optional). Flow/return stool pieces (Optional) 0. DHW thermostat/thermometer box. T&P valve connection (unvented) The installer must fit a safety valve in the flow pipework before any isolation valve. The installer must ensure the automatic air vent () is fitted. The installer must also ensure the condensate drain connection () is piped to drain via a drain trap to prevent flue gases escaping. Do not fit an isolation valve in this pipework. It is recommended that a DHW drain is fitted to the cold feed adjacent to the calorifier to facilitate draining the calorifier. A single phase 0V supply is required for the control panel operation. Single phase burners and pumps are electrically supplied via the control panel. Three phase burners and pumps require a seperate three phase isolated supply (by the installer) direct to the burner / pump. The supply to the burner should be flexible to allow for boiler / burner door opening. In this case control cables fitted with wieland plug/sockets will still run between the control panel and the burner. Cosmo Boiler Dimensions: 0 90 0 0 00 0 90 00 00 0 a (boiler) (mm) 00 0 90 0 90 0 90 0 0 90 90 0 00 b (mm) 0 0 0 0 0 0 0 0 0 0 c (mm) 90 90 90 0 0 0 00 00 00 00 d (mm) 0 0 0 9 9 9 9 e (mm) 0 0 0 0 0 0 0 0 0 f (mm) 0 0 g (mm) 9 9 9 99 99 99 h (mm) 9 9 9 09 09 09 i (mm) 0 0 0 0 0 0 0 0 0 0 0 0 0 j (mm) 9 9 9 00 00 00 Cosmo Boiler connections: Flow (PN) DN DN DN DN0 DN0 DN0 DN DN DN DN0 DN0 DN0 DN0 Return (PN) DN DN DN DN0 DN0 DN0 DN DN DN DN0 DN0 DN0 DN0 Drain (BSP) G./ ײ G./ ײ G./ ײ G./ ײ G./ ײ G./ ײ G ײ G ײ G ײ G ײ G ײ G ײ G ײ Flue O/Dia (mm) 9 9 9 9 9 9 9 C type Calorifier dimensions: CT0 CT0 CT0 a (calorifier) (mm) 0 0 90 k (mm) 0 90 90 C type Calorifier connections: Primary inlet & outlet (BSP) R./ ײ R./ ײ R./ ײ DHW flow (BSP) R./ ײ R./ ײ R./ ײ DHW cold feed (BSP) R./ ײ R./ ײ R./ ײ DHW return (BSP) R ײ R ײ R ײ
Dimensions and Technical Information Cosmo Combination boiler (models 0-0 with A-type calorifiers) a (calorifier) Calorifier primary pump, stool piece and pipework optional A, A & A A c c 0 0 Where calorifier is longer than boiler, it will overhang at the front. k 9b 9a 0 0 9 Burner & Flue C L d a (boiler) i 00 d j b e f h 0 g g 0 g g 0 Flow Return Hydraulic drain Flue outlet Condensate drain R/ ײ Note: Automatic air vent G/ ײ Std control panel position Plugged vent connection 9. DHW flow, (9a A & A, 9b A) 0. DHW cold feed. DHW return. Calorifier primary inlet. Calorifier primary outlet. Primary vent. Primary pump (Optional). Non-return valve (Optional). Flexible pipework (Optional). Flow/return stool pieces (Optional) 0. DHW thermostat/thermometer box. T&P valve connection(s) (unvented) The installer must fit a safety valve in the flow pipework before any isolation valve. For Model options please refer to separate selection table. The installer must ensure the automatic air vent () is fitted. The installer must also ensure the condensate drain connection () is piped to drain via a drain trap to prevent flue gases escaping. Do not fit an isolation valve in this pipework. It is recommended that a DHW drain is fitted to the cold feed adjacent to the calorifier to facilitate draining the calorifier. # All flanged connections PN as standard, PN on bar version. A single phase 0V supply is required for the control panel operation. Single phase burners and pumps are electrically supplied via the control panel. Three phase burners and pumps require a seperate three phase isolated supply (by the installer) direct to the burner / pump. The supply to the burner should be flexible to allow for boiler / burner door opening. In this case control cables fitted with wieland plug/sockets will still run between the control panel and the burner. Cosmo Boiler Dimensions: 0 90 0 0 00 0 90 00 00 0 a (boiler) (mm) 0 90 0 90 0 90 0 0 90 90 0 00 b (mm) 0 0 0 0 0 0 0 0 0 c (mm) 90 90 0 0 0 00 00 00 00 d (mm) 0 0 0 9 9 9 9 e (mm) 0 0 0 0 0 0 0 0 f (mm) 0 g (mm) 9 9 99 99 99 h (mm) 9 9 9 09 09 09 i (mm) 0 0 0 0 0 0 0 0 0 0 0 0 j (mm) 9 9 00 00 00 Cosmo Boiler connections: Flow (PN) # DN DN DN0 DN0 DN0 DN DN DN DN0 DN0 DN0 DN0 Return (PN) # DN DN DN0 DN0 DN0 DN DN DN DN0 DN0 DN0 DN0 Drain (BSP) G./ ײ G./ ײ G./ ײ G./ ײ G./ ײ G ײ G ײ G ײ G ײ G ײ G ײ G ײ Flue O/Dia (mm) 9 9 9 9 9 9 9 A type Calorifier dimensions: A A A A a (calorifier) (mm) k (mm) 0 0 0 A type Calorifier connections: Primary inlet & outlet (PN) # DN0 DN DN DN DHW flow (BSP/PN) # R ײ R ײ R ײ DN DHW cold feed (BSP/PN) # R ײ R ײ R ײ DN DHW return (BSP) R ײ R ײ R ײ R ײ
Product Specification Selection chart Cosmo Boiler: 0 90 0 0 00 0 90 00 00 0 Calorifier CT0 CT0 CT0 A A A A The above table indicates the boiler / calorifier combinations available. Standard Specification The Cosmo Combination is supplied with the following as standard: Cosmo boiler complete with rear flow and return, flue, hydraulic and condensate drain connections. Right hand hinged (left hand optional) boiler door with sight glass. Bolt-on smoke box with clean out door. Open vented CT or A type calorifier. Mineral wool insulation matress. Steel casings finished in red and orange. Control panel containing: Burner control thermostat, Burner high/low thermostat, On/off switch, Excess temperature, burner run, burner lockout, and high fire indicators, Boiler thermometer. Calorifier control stat and thermometer box. Fully matched high/low pressure jet burner with wiring harness. Tommy bar. Cleaning brush with rod. Installation, Operation and Maintenance instructions. Optional Specification The following options are available on request: Modulating burner with controller in boiler control panel. Modulation of burner via 0-0 volt signal. Calorifier immersion heater. up to No..kW per modul cylinder. kw, 9kW and kw on CT calorifiers. Separate isolated power supply by installer. Calorifier primary loading pump with non return valve, isolation valves, primary -port valve (only on unvented DHW systems), and pump starter panel (if required), all for connection from main system header(s) by others. Calorifier primary loading pump and pipework kit for fitting to boiler by installer, and comprising: Primary inline circulating pump, Non return valve, Pump isolation valves, Boiler flow and return stool pieces, Flexibles (where appropriate), Pump starter panel (where required). Primary -port valve (unvented DHW systems only). Optional Specification Continued... Boiler safety valve, altitude gauge, drain valve, gas boosters and shrouds. Calorifier high temperature limit thermostat (hand reset type). Volt-free contacts for boiler run, burner lock out, and boiler high temperature lockout signals. Volt-free contact for calorifier high temperature lockout signal. Calorifier suitable for unvented system and complete with temperature and pressure relief valve connection(s), calorifier hand reset limit thermostat, temperature and pressure relief valve(s). Unvented system kit comprising: Strainer, Pressure reducing valve with gauge, Double check valve, Expansion vessel, Combined lock shield / drain valve, Expansion relief valve with tundish. Calorifier magnesium anode. Calorifier primary pump and pipework (Optional) (open vented units detailed) Cosmo / CT0-CT0 Cosmo / A, A & A Cosmo / A. Primary loading pump.. Non-return valve.. Pump isolation valves.. Flexible hose (where practical).. Rigid pipework.. Boiler return stool piece,. Boiler flow stool piece.. Pump starter panel. Note. All items are sent as a kit for the installer to assemble. Wiring to and from the primary loading pump and -port valve (where required) is by the installer. All ph pumps and large ph pumps will require a pump starter. The pump starter is supplied in a small enclosure for mounting and site wiring by the installer.
System Design Primary systems Integral primary pump & pipework The Cosmo Combination can be supplied complete with an optional fully matched calorifier primary loading pump, valves and pipework kit for site assembly and wiring by the installer. Calorifier primary loading pump and pipework. Vented Unvented Primary system key.. Boiler flow. Boiler return. Primary inlet. Primary outlet. Check valve. Isolation valve Secondary systems The Cosmo Combination can be used on both vented and unvented systems. The installer must fit a secondary drain connection in the cold feed between the unit and the isolation For applications where some degree of standby is necessary, the installer should consider either fitting an immersion heater or where DHW outputs are crucial, two or more units should be installed as shown on the right. These schematics are for guidance only and do not constitute system design.. Primary pump. -Port valve 9. System pump(s) 0. -Port valve. Heating circuits Summer Operation The use of boiler plant for all year round operation makes best use of capital investment. Using a combination boiler, illustrates this point with the close matching of the boiler output to the calorifier output. In the summer, for example, the DHW load (and possibly a small heating load) will be required. Where two or more combination boilers are installed it is therefore desirable for all calorifiers to be served by a matching boiler output, usually from just one boiler. The above can be achieved using one of the following typical schemes: Primary connections via low loss header. () -port valve on unvented calorifiers 9 only. Heating the calorifier primaries via a low loss header is one way of providing both heating and DHW standby. If no heating is required during the summer, isolate the header from the heating system(s). Twin primary pumps () available on request. Primary connections via main flow and return headers. Connecting the calorifier primary pumps and pipework to the main flow and return headers. If no heating is required during the summer, isolate the flow and return headers from the heating system. Primary connections via main flow and return headers. A -way valve can be used to control the flow of primary water to the calorifier. # Where the main heating pump has sufficient head this can be used to charge the calorifier, otherwise a separate pump () is required. Optional -port valve () mandatory on unvented DHW systems. valve. An anti-thermal dip should be fitted in the cold feed to prevent natural circulation back up the cold feed pipe. This pipe should not be oversized as this may cause thermal circulation. 9 0 () -port valve on unvented calorifiers only. # See note below () -port valve on unvented calorifiers only. 9 Secondary connections Unvented system. Secondary connections Vented system.. DHW flow. DHW return. DHW cold feed. Cold water mains. Strainer. Pressure reducing valve. Double check valve. Lock shield valve 9. Drain 0. Expansion vessel. Isolation valve. Expansion relief valve. T&P relief valve. Secondary recirculating pump.. Anti-thermal dip 0 9 9 Cosmo / CT Combination shown.. DHW flow. DHW return. DHW cold feed. Cold water mains. F & E tank. Isolation valve. Secondary recirculating pump. Vent pipe 9. Anti-thermal dip 0. Drain Cosmo / CT Combination shown. 9 0
Installation Information Delivery and assembly All Cosmo combination boilers are delivered with calorifier, burner, insulation, casings, control panel and (where ordered) pump kits packed separately for fitting by the installer. Any ancilliary items such as safety valves, immersion heaters, altitude gauges, drain valves, gas boosters etc will also be supplied separately for fitting and wiring (where appropriate) by the installer. As standard, the boiler and calorifier will be supplied as two separate units for the installer the mount on site. It may be possible to do this in our factory prior to delivery, please consult Hoval Technical to discuss. Before mounting the burner, the front casing must be fitted. Likewise before connecting the flue, the rear casing must be fitted. Boiler shipment dimensions and weights H W L Lifting shackle Cosmo Boiler Model 0 90 0 0 00 0 90 00 00 0 Boiler Dimensions: L (mm) 9 09 9 09 9 0 0 0 0 W (mm) 90 90 90 0 0 0 0 0 0 0 H (mm) 0 0 0 0 0 0 0 0 0 0 Weight: (kg) 0 0 Casings Box Dimensions: L (mm) 0 0 0 0 0 0 0 0 0 90 90 90 90 W (mm) 0 0 0 00 00 00 00 00 0 0 0 0 0 H (mm) 0 00 00 0 0 0 0 0 0 0 0 0 0 Weight (kg) 90 90 00 0 0 00 Calorifier Shipment dimensions and weights C type Calorifiers Lifting eye A type Calorifiers H H Lifting lugs W L W L Cosmo Calorifier Model CT0 CT0 CT0 A A A A Calorifier Dimensions: L (mm) 0 0 90 00 00 00 00 W (mm) 00 00 00 = boiler width = boiler width = boiler width = boiler width H (mm) 00 00 00 99 Weight: (max) (kg) 0 0 0 0 Casings Box Dimensions: L (mm) 900 900 900 900 900 900 900 W (mm) 00 00 00 00 00 00 00 H (mm) 0 0 0 0 0 0 0 Weight (max) (kg) 0 0 0 0
Installation Information K Minimum Access L W T Plantroom Layout. Wherever possible, space should be left around the boiler to enable all parts to be examined and the cubicle casings to be fi tted or removed easily. Front clearance: Space for the burner and the servicing of the equipment, must be accommodated. Ideally, front clearance should equate to the length of the boiler. This will permit the cleaning and removal of boiler tubes and also the extraction of DHW immersion heaters and where required sacifi cial anodes. The installer is advised to avoid creating obstructions which may hinder opening the boiler door, or the fi tting of an acoustic shroud. These obstructions include; other plant, extended boiler plinths, extensive gas pipework, and rigid oil lines / burner power supplies. Boiler plinth should not obstruct the shroud. K = (W T) x L T = (W K) x L T = Door opening K = Corridor width W = Boiler width L = Boiler length Hoval recommend the boiler plinth does not project beyond the front of the boiler as this will prevent a wheel-over type shroud from encapsulating the burner. Also, in some circumstances a plinth may be necessary to increase the firing height of the boiler to accomodate a particular burner. The installer must avoid, wherever practicable, the fi tting of pipework within the swing of the boiler door. If this is not possible, a removeable stool piece with a shut off valve upstream must be fi tted. Side Clearance: Generally a minimum clearance of 00mm is required at the side of the boiler to fi t and remove the side casings. Space to one side of the boiler is required to swing the boiler door with the burner fi tted, (standard to the right, optional to left), whereby when the door is open 90 o, the length of the burner+0mm will be at the side of the boiler. Normally the same access for the burner swing can also be Typical Plan View If ph burners are fi tted, the installer should ensure that the power supply to the burner is fl exible to allow the boiler door to fully open. used for getting to the back of the boiler. Where gas burners are fi tted consideration should be given to the gas train (and booster if specifi ed). Normally the gas pipe mains are run either from high or low level. In both cases an elbow has to be fi tted off the gas train to connect back to the header. Where gas trains fall within the width of the boiler this elbow has to be taken into account. Rear clearance: is required for the fl ue and system connections and access to the cleaning door. Consideration for the fl ue and calorifi er connections should be made to ensure these do not clash. Top clearance: is required above the unit to fit safety valves, automatic air vents and to access the calorifi er. Shorter clearances are possible subject to cleaning methods and plantroom layout. Please consult Hoval technical. Unvented systems: Where the DHW system is unvented, an unvented system kit must be installed. Unvented systems can be fed either directly from the mains or through a cold water booster set. Both require an unvented system kit. Hoval s standard kits are sized to suit the calorifi er. Where balanced hot and cold water services are required, valves sizes may have to be increased. In addition to the unvented system kit, a hand reset limit stat and primary -port valve must be fi tted. Mains fed unvented system kit: With a mains fed unvented system kit Hoval supply the following:- - Strainer. - Pressure reducing valve with gauge. - Double check valve. - Expansion vessel with combined lock shield / drain valve. - Expansion relief valve with tundish. - Temperature and pressure relief valve. Boosted unvented system kit: With a boosted unvented system kit Hoval supply the following:- - Double check valve. - Expansion vessel with combined lock shield / drain valve. - Expansion relief valve with tundish. - Temperature and pressure relief valve. - Pressure reducing valve with gauge (not necessary on systems with inverter controlled booster sets or where this is part of the booster package). Space should be allocated for siting the expansion vessel off the cold feed pipework. It is recommended that a lock shield / drain valve should be installed in the leg to the expansion vessel. The pipework to the expansion vessel should be kept to a minimum to avoid an unnecessary dead-leg. Common unvented system kit: Where two or more Cosmo Combinations are installed it is possible to fi t a common unvented system kit in the main cold feed prior to teeing off to the calorifi ers. The following items are sized to suit the output of all the units and the total system volume including the cylinder volume: - Strainer, - Pressure reducing valve with gauge, - Double check valve, - Expansion vessel with combined lock shield / drain valve. The following safety valves must be fi tted to each calorifi er: - Expansion relief valve and tundish - Temperature and pressure relief valve(s). There should be no means of isolating the expansion relief valve and the temperature and pressure relief valve(s) from the calorifi er.
Other associated products Uno- The Uno- boiler couples high efficiency with low NOx emissions. These dual goals are achieved with the special -pass design which incorporates the unique Hoval thermolytic heat exchanger. Available as heating only units or with a calorifier as a combination unit, with ratings between 0 and 0 kw and DHW up to 0 litres per hour. Plate heat exchangers At the heart of Hoval s plate heat heat exchanger programme is the Hoval UltraPlate, which is available in two basic models; the UP-g gasketted and the UP-b brazed plate heat exchanger. The UltraFlow plate heat exchanger packages and UltraStore plate heat exchanger / buffer vessel packages embrace the advantages of the UltraPlate and provide the installer with an economic solution to meet their DHW needs. Cosmo heating only and heatpack The Cosmo heating only boilers are available with outputs up to 00kW and heatpack boilers up to 900kW. Suitable for firing on gas, oil and dual fuel with a fully matched and packaged pressure jet burner. The Cosmo-plus boiler combines with a suitable TC-AF ThermoCondensor for additional efficiency gains PressVal Micron The PressVal Micron range of pressurization units are compact microprocessor controlled units. Covering all system ouputs from small commercial heating and chilled water systems, through to the very largest district heating schemes. Both single and twin pump units are available in wall hung, free standing, skid mounted, or cabinet housed configuations. Volt free contacts for BMS interface provide as standard. April 00 By Appointment to Her Majesty the Queen Boiler Manufacturers & Engineers Hoval Ltd Newark. Conservation of energy - protection of the environment Hoval follows a policy of continued improvement and reserves the right to change specifications without notice.