GAZ - FIRED AIR HEATERS TECHNICAL NOTICE AND INSTRUCTIONS FOR MONTAGE ACGH 16/20/28/35/45/55/75/95 ACGC 20/28/35/45/55/75/95 ACGV 26/28/36/45/55/75/95

GAZ - FIRED AIR HEATERS TECHNICAL NOTICE AND INSTRUCTIONS FOR MONTAGE ACGH 16/20/28/35/45/55/75/95 ACGC 20/28/35/45/55/75/95 ACGV 26/28/36/45/55/75/95 1312BO3933 DTC AT 13 135 FR 1

TABLE OF CONTENTS Section No. Sections Pages 1 GENERAL RECOMMENDATIONS 2 1-1 Description of devices Operation 2 1-2 Instruction for use 3 1-3 Operating 3 1-4 Safety 3 1-5 Cut-off 3 1-6 Guarantee 3 2 TECHNICAL SPECIFICATIONS OF AT GAS UNIT HEATERS 5 2-1 Performance of ACGH helical gas unit heaters 5 2-2 Performance of ACGV gas unit-destratificators 6-7 2-3 Performance of ACGC centrifugal gas unit heaters 8-9 Assembly of the fan casing for ACGC 9 3 RETENTION OF UNIT HEATERS 10 3-1 Adjustable rotation console for ACGH 16/20/26/28/35/36/45/55 10 3-2 Rotation console for IPN, adjustable for ACGH 16/20/26/28/35/36/45/55 10 3-3 Adjustable wall-mounted console for ACGH75/95 11 3-4 Adjustable wall-mounted console for ACGC 11 4 ELECTRICAL WIRING 12 4-1 Electrical schematic of unit heaters 12 4-2 Electrical schematic of ACG75C centrifugal unit heaters 13 4-3 Electrical schematic of modulating unit heaters and ACGV 13 4-4 Basic connection schematic with pilot wire thermostat 14 4-5 Basic connection schematic with individual thermostat 14 5 CONNECTION OF THE EVACUATION CONDUITS 15 5-1 Evacuation conduit accessories for ACGH 20/28/35 15 5-2 Evacuation conduit accessories for ACGH 45/55/75/95 15 5-3 Connecting to the unit heater 15 5-4 Connection of wall-mounted concentric cup - C12 for ACGH and ACGC 16 5-5 Connection of roof mounted concentric cup - C32 - for ACGH and ACGC 16 5-6 Connection of roof outlet - B22 for ACGH, ACGC and ACGV 17 5-7 Connection of roof mounted concentric cup - C32 for ACGV 17 6 GAS CIRCUIT 18 6-1 Changing gas 18 6-2 Valve adjusting table first speed 19 6-3 Adjusting table modulating valve 19 7 GAS CONNECTION 20 7-1 Connection of unit heaters 20 8 COMMISSIONING THE GAS UNIT HEATERS 20 8-1 Operating principle 20 8-2 Bill of material 21 9 MAINTENANCE 22 10 RECOMMENDATIONS FOR USER 22 11 TROUBLE SHOOTING 23 NOTICE The range of products which is the subject of these instructions has successfully undergone numerous tests and inspections defined by the European Gas Directive : mechanical and electrical safety, reliability, combustion hygiene, etc. In addition to the technical requirements that it requires, the CE mark constitutes official recognition concerning the quality of design, manufacture and performance of this device. Its lifetime and its performance will be at optimum level if its use and its maintenance is carried out in accordance with the rules of the trade and the current requirements. 2

1-GENERAL RECOMMENDATIONS These devices can only be installed in rooms which are sufficiently ventilated, unless the device has a sealed connection. The correct operation of the unit heater depends on correct installation and commissioning. If these rules are not observed, the manufacturer will immediately be exempt from any liability. The installation and maintenance must be carried out in conformity with the regulation text and the current rules of the trade and by qualified personnel. DO NOT INSTAL THE GAS UNIT HEATER IN: - Rooms which have a risk of explosion, - Rooms containing chlorinated combination vapours, - Rooms with a high content of combustible dust, - Very humid rooms (electrical danger). - Domestic rooms. RECOMMENDATIONS FOR INSTALLATION : - Provide a minimum distance of 200 mm at the rear of the device fan side. - Provide sufficient clearance for opening the burner door. - The unit heater must be placed at a minimum of 200 mm from the ceiling and 2000 mm from the floor. After verifying that the assembly respects the requirements of these instructions, it is the responsibility of the installer: 1) to inform the user: -that he or she cannot carry out any modifications him or herself to the design of the devices and the manner in which the installation is executed ; The slightest modification (exchange, withdrawal...) of safety components or parts which influence the output of the device or combustion hygiene will automatically entail the withdrawal of the CE mark for the device. -that it is essential to carry out the required cleaning and maintenance operations. An annual preventive maintenance operation is obligatory. 2) to give the user these instructions AIRCALO, with the agreement of the organisation which has notified the CE marking, reserves the right to update these technical instructions. Only the instructions which accompany the product at its shipment can be considered as contractual; keep the instructions carefully near the device. 1-1 - Description of the device Operation The ACG gas unit heater is a generator of independent hot air, operating with natural gas and propane; it is in conformity with the EEC European Directive 90/396 applicable to gas apparatus. It constitutes a "direct" heating gas system ; it is a device for the production and the emission of heat without an intermediate vehicular fluid. For the whole range described in these instructions, the combustion products are ejected out of the room using an extractor. The combustible air is taken from the ambient environment or from outside. These devices can be connected using a cup connection vertically or horizontally, or with a chimney outlet. ACG gas unit heaters operate using the various gases indicated on their manufacturer s plates in conformity with the European Directive. 1.2. Instructions for user - Please read the instructions in this manual carefully for the operation and maintenance of this device. - Have maintenance carried out at least once a year by qualified personnel. The frequency of the maintenance operations depends on the environment in which the device is installed. In particular, more regular inspection must be carried out in dusty locations. - Regularly verify that there is no damage to the device, to the chimney or to the gas conduit. - Regularly verify that the air openings in the building and around the device are not obstructed. - Verify that the hot air can circulate normally in the room, and therefore that there is no obstacle in front of the blowing outlet of the device, and that the grille is indeed open. 1.3. Operation When heat is required, the burner ignites using the ignition electrode then the pan starts to run, the hot air is then blown into the room. When the setting temperature is attained, the burner is extinguished. The fan continues to turn for about one minute, until it has eliminated the heat remaining in the heat exchanger. 3

1.4. Safety - If there is no flame, this is detected by an ionisation sensor and the gas vales are immediately closed. - The thermal protection of the heat exchanger is ensured by two thermostats. The first, which is automatically reset, protects against insufficient air flow (obstructions, fan failure). The second, which has to be manually reset, is set to a higher threshold than the first one. It protects the device against high excess heating due to an operating problem or unsuitable use. If the operation shows any difficulty whatsoever, please contact us. Make sure that the device can be supplied normally with combustion air at atmospheric pressure (any modification of the building after the installation of the device must be carried out taking this into account). Excessively low pressure inside the room can harm the correct functioning of the device by depriving it of the air necessary for combustion. The lowest temperature for device functioning is - 10 C. 1.5. Cut-off - To cut the device off during a short period, it is necessary only to cut off the thermostatic line (this means turning the thermostat to a minimum setting point or turning off the thermostat switch). - For a prolonged stoppage, switch off the thermostatic line, close the gas valve and cut off the electrical supply, taking care to wait for the fan to stop turning. Gas and electricity must only be cut off in case of emergency or for long stoppage periods. 1.6. Guarantee (An extract from the general sales condition, section GUARANTEE) : The devices must be installed by qualified professional personnel, in conformity with current regulations, with the rules of the trade and the instructions which are found in our assembly instructions. The devices are guaranteed 1 year against any manufacturing failure and 5 years for the heat exchangers as long as they are operated using the normal user instructions. The guarantee takes effect on the date of manufacture by our company and on condition that the guarantee form is returned completed and signed. We decline any responsibility and no guarantee will be applicable in case of negligence of the customer, of defective installation, or installation which is unsuitable or not in conformity with current standards. Only defects in manufacture or raw materials are concerned. The guarantee is limited to the replacement of parts which are found to be defective by identical parts; costs of labour, travel, transport and excess to the equipment are excluded. Any replacement which takes place during the guarantee period, even if it necessitates the immobilisation of the equipment, cannot in any circumstances extend the duration of the guarantee. No damages or interest can be claimed for direct or indirect prejudice. It is imperative that the installation, maintenance and any trouble shooting is carried out by qualified professional personnel. Any servicing must be carried out using the rules of the trade and therefore in accordance with current standards and the indications supplied by our company in this manual. The correct operation of the device depends on correct installation and commissioning. Non-respect of the rules will immediately cause our company to refuse any liability. The devices must only be equipped with the original smoke system and air intake. In case of use of accessories other than those proposed by our company, check that they are indeed compatible with the devices. Our company will not be responsible for any damage or prejudice resulting from improper use of the devices. The engineering studies office, the installer and the user are solely responsible for being aware of and respecting the legal provisions as well as the standards which are inherent in the design, location, installation, commissioning and maintenance. Damage due to the following causes cannot be taken into consideration or covered by our guarantee : - caused by external phenomena - caused by negligence on the part of the user - caused by non-respect of the settings in our technical manual - due to immediate or later damage caused by incorrect handling during transport, or incorrect manoeuvres - caused by the use of accessories other than the original ones - caused by defects in maintenance and monitoring. Whether this concerns the purchaser or any other person, our company cannot under any circumstances be held responsible for bodily injury or material damage of any type whatsoever, which could be caused by our products or which would be the direct or indirect consequence of the use of the said products. 4

2- TECHNICAL SPECIFICATIONS OF ACG UNIT HEATERS Axial Fan. ACGH Model The ACGH unit heaters are equipped with an axial fan. They are intended for direct blowing and are equipped, as standard, with a double deflection grille. 2-1 Performance of ACGH helical gas unit heaters TYPES ACG16H ACG20H ACG26H ACG28H ACG35H ACG36H ACG45H ACG55H ACG75H ACG95H Calorific output kw 16 21 26 28 35 36 45 55 71 92 Usable power kw 14.5 19.5 23.5 25,5 31,5 32.5 40,5 50 64,4 84 Efficiency % > 91 >91 >91 > 91 > 91 >91 > 91 > 91 > 91 > 91 No of fans 1 1 1 1 1 1 1 1 1 2 Rotation speed Rpm 1 400 900 900 900 900 900 900 900 900 900 Air flow at 15 C Air flow at 50 C m 3 /h 1 350 1 500 1 450 1 625 2 000 2 250 2 050 2 300 2 900 3 250 2 900 3 250 4 000 4 450 4 900 5 500 5 800 6 500 Delta T of air C 32 40 35 36 32 33 30 30 32 31 Reach of air jet m 12 12 16 16 23 23 26 28 30 30 Gas flow at 15 C Natural G20 20 mbar 25 1.69 m 3 / h 1.88 m 3 / 2.22 m 3 / h 2.46 m 3 / 2.75 m 3 / h 3.06 m 3 / 2.96 m 3 / h 3.29 m 3 / 3.70 m 3 / h 4.11 m 3 / 3.81 m 3 / h 4.23 m 3 / 4.76 m 3 / h 5.28 m 3 / 5.82 m 3 / h 6.43 m 3 / 7.40 m 3 / h 8.22 m 3 / Smoke diameter mm 100 130 130 130 80 / 125 80 / 125 80 / 125 80 / 125 80 / 125 80 / 125 Air inlet mm 100 130 130 130 Supply voltage Mono-phase 230 Volts / 50 Hz - IP42 Electrical power VA 290 300 310 310 320 320 350 500 580 750 Weight kg 54 81 82 82 85 85 105 125 152 194 Noise level (fan) dba 37 39 40 40 41 41 46 51 52 49 8 000 8 950 10.0 m 3 / h 11.1 Overall dimensions of ACGH models Connection for 20/28/35 Smoke Air Gas Connection for 45/55/75/95 Smoke Air Gas 5 A B C Ø F Ø Air Ø G ACG16H 810 780 356 80 / 125 1/2 ACG20H 1 040 800 460 80 / 125 1/2 ACG26H 810 820 460 80 / 125 1/2 ACG28H 1 040 820 460 80 / 125 1/2 ACG35H 1 040 820 510 80 / 125 1/2 ACG36H 810 820 570 80 / 125 1/2 ACG45H 1 040 820 570 100 100 1/2 ACG55H 1 040 840 700 130 130 1/2 ACG75H 1 120 840 820 130 130 3/4 ACG95H 1 120 840 1075 130 130 3/4

Vertical model ACGV ACGV destratificators are equipped with an axial fan. They are intended for direct vertical blowing and are equipped with a double deflection grille. They are specially suitable for direct blowing into corridors and offer the special feature of both heating and destratifying. 2-2 Performance of the ACGV gas destratificator TYPES ACG26V ACG28V ACG36V ACG45V ACG55V ACG75V ACG95V Calorific output kw 26 28 36 45 55 71 92 Usable power kw 23.5 25.5 32.5 40,5 50 64,4 84 Efficiency % >91 >91 >91 > 91 > 91 > 91 > 91 No of fans 1 1 1 1 1 1 2 Rotation speed Rpm 900 900 900 900 1400 1400 900 Air flow at 15 C Air flow at 50 C m 3 /h 2 000 2 250 2 000 2 250 2 900 3 250 4 000 4 450 4 900 5 500 5 800 6 500 8 000 8 950 Delta T of air C 35 36 33 30 30 32 31 Reach of air jet m See page 7 Height of installation m 4/5 4/5 4/6 5/8 5/10 6/12 6/12 Gas flow at 15 C Natural G20 Groningue G25 Propane G31 20 mbar 25 mbar 37 mbar 2.75 m 3 / h 3.06 m 3 / h 2.03 kg/h 2.96 m 3 / h 3.29 m 3 / h 2.18 kg/h 3.81 m 3 / h 4.23 m 3 / h 2.81 kg/h 4.76 m 3 / h 5.28 m 3 / h 3.51 kg/h 5.82 m 3 / h 6.43 m 3 / h 4.30 kg/h 7.40 m 3 / h 8.22 m 3 / h 5.46 kg/h 10.0 m 3 / h 11.1 m 3 / h 7.40 kg/h Smoke diameter mm 100 130 130 130 80 / 125 80 / 125 80 / 125 Air input diameter mm 100 130 130 130 Supply voltage Monophase 230 Volts / 50 Hz - IP42 Electrical power VA 310 310 320 350 500 580 750 Weight kg 82 82 90 105 127 152 194 Sound level (fan) At 5 m in free field dba 40 40 41 46 51 52 49 ACGV model operating principle Destratificators in the ACGV range incorporate two functions : Heating, operating identically to that of a gas unit heater. Destratification, the fan operating in accordance with the temperature of the ambient air. CAUTION : When determining the equipment to be used, supplement the destratification volume by non-heating destratificators (see photo opposite), to respect the minimum recommended rate of agitation*. 6

Overall dimensions of the ACGV models I I Types ACG26V ACG28V ACG36V ACG45V ACG55V ACG75V ACG95V A 810 1040 810 1 040 1 040 1 120 1 120 B 800 790 820 820 840 840 840 C 460 460 570 570 700 820 1075 D 134.5 120 134.5 128 134.5 149.5 149.5 E 380 380 490 490 610 730 H 162 164 217 217 252 366 455 I 479 677 479 677 677 677 677 Ø F 130 130 130 80/125 80/125 80/125 100 / 100 Ø Air 130 130 130 Ø G (gas) 1/2 1/2 1/2 1/2 1/2 3/4 3/4 Installation height of ACGV models The ACGV models are retained at their upper part by four tightened M8 nuts. Blowing is vertical towards the ground and the installation height must not be lower or higher than that recommended. To get the best performance from the ACGV gas destratificators, we recommend you to respect the following heights. Types ACG26V ACG36V ACG55V ACG75V ACG95V L1 (min) m 0,45 0,45 0,45 0,50 0,60 L2 (min) m 1 1 1 1 1 L3 (min) m 1 1 1 1 1 H : Height (mini/ max) P : Max air reach m 4 / 5 4 / 6 5 / 8 6 / 12 6 / 12 m P = 16- H P = 20- H P = 25- H P = 28- H P = 30- H 7

Centrifugal model. ACGC ACGC unit heaters are equipped with a centrifugal fan and are supplied as standard with an air case (assembly p. 9). They are intended for blowing or taking air from a sheath network. Mixture dampers and a filter can be incorporated on the air case. 2-3 Performance of ACGC centrifugal gas unit heaters TYPES ACG20C ACG28C ACG35C ACG45C ACG55C ACG75C Calorific output kw 21 28 35 45 55 71 Useable power kw 19.5 25.5 31.5 40.5 50 64.4 Efficiency % > 91 > 91 > 91 > 91 > 91 > 91 Type of fan BD25/25 M6 BD28/28 M6 BD28/28 M6 BD33/33 M6 BD33/33 M6 BD33/33 M6 Motor electrical power kw - Hp 0.25-1/3 0.37-1/2 0.37-1/2 0.75-1 0.75-1 1.1-1.5 Motor rotation speed Rpm 720 680 850 750 860 980 Motor coupling Speed MV GV PV MV Flow/pressure curve N 2 4 5 8 9 10 Air flow at 15 C Air flow at 50 C m 3 /h 1 700 1 900 2 050 2 300 2 800 3 150 3 900 4 350 4 400 4 950 Delta T of air C 33.7 36.6 33.1 30.5 33.4 35.1 Pressure of available Pa 120 90 135 110 135 130 5 400 6 050 ACG95C 92 84 > 91 BD33/33 M6 2 (0.75-1) 750 PV - 7 600 8 500 29.1 130 Gas flow at 15 C Natural G20 Groningue G25 Propane G31 20 mbar 25 mbar 37 mbar 2.22 m 3 / h 2.46 m 3 / h 1.64 kg / h 2.96 m 3 / h 3.29 m 3 / h 2.18 kg / h 3.70 m 3 / h 4.11 m 3 / h 2.73 kg / h 4.76 m 3 / h 5.28 m 3 / h 3.51 kg / h 5.82 m 3 / h 6.43 m 3 / h 4.30 kg / h 7.40 m 3 / h 8.22 m 3 / h 5.46 kg / h 10.00 m 3 / h 11.1 m 3 / h 7.4 kg / h Smoke diameter mm 80 / 125 80 / 125 80 / 125 100 130 130 Air input diameter mm 100 130 130 Supply voltage Mono-phase 230 Volts / 50 Hz - IP42 Electrical power VA 860 900 920 1250 1350 1700 Weight kg 99 117 125 140 165 180 130 130 2 400 260 Assembly of the fan case for ACGC Preparation for assembly : Disassemble the side panels (1) and (2) of 2 the fan case A 3 Assembly of A and B : Assemble the fan case A on the thermal case B, using the 4 BTR M8 (3) screws 1 provided. B Caution : Position the fan supply electrical connector (5) at the supply cable end (7), See photo (I) above. Electrical connection : Connect the fan connector (5) with the thermal module connector (6), see photo (II) above. I 5 7 6 II A Fan case B Thermal case Reinstall the side panels (1) and (2) using the hardware supplied. 8

Flow/pressure curves Pa 200 180 160 4 6* 5 140 120 100 1* 2 3* 80 60 40 Pa 220 200 180 160 140 120 100 80 60 40 1 400 1 600 1 800 2 000 2 200 2 400 2 600 2 800 3 000 M 3 /h ACG20C t 41 C t 36 C t 32 C t 29 C ACG28C t 42 C t 37 C t 34 C ACG35C t 36 C t 33 C t 31 C 7* 8 9 10 3 400 3 600 3 800 4 000 4 200 4 400 4 600 4 800 5 000 5 200 5 400 5 600 M 3 /h ACG45C t 35 C t 33 C t 31 C t 30 C ACG55C t 37 C t 35 C t 33 C t 32 C ACG75C t 40 C t 38 C t 36 C t 35 C t 34 C * Flow/pressure curves with filter, consult us for this application. Maximum dimension of the ACGC models and optional accessories A A1 A2 A3 A4 B B1 H L L1 L2 L3 P Ø F Ø Air Ø AT 20 1040 750 750 780 388 480 440 460 356 381 310 155 480 80 / 125 1/2 AT 28 1040 750 750 780 388 480 440 460 356 381 310 155 480 80 / 125 1/2 AT 35 1040 750 750 780 388 480 440 510 406 431 360 180 480 80 / 125 1/2 AT 45 1040 750 750 780 388 580 540 570 466 491 420 210 580 100 100 1/2 AT 55 1040 750 750 780 388 580 540 700 594 618 540 270 580 130 130 1/2 AT 75 1120 750 750 780 388 580 540 825 720 775 690 220 580 130 130 3/4 AT 95 1120 750 750 780 388 1080 1040 1075 1020 1040 940 250 680 130 130 3/4 9

3 MOUNTING OF UNIT HEATERS (See instructions supplied with the consoles) 3-1 Installation recommandations For good functionnning and the security of devices it s necessary to respect the munimum installation distances (see the schema below). 200 mini 700 mini 200 mini 200 mini 2000 mini 2000 mini 200 mini 200 mini 200 mini 3-2 Rotating console for IPN adjustable for ACGH 16/20/26/28/35/36/45/55 C Caution: make sure of the strength of the bracket ACG16 H ACG20H ACG26H ACG28H ACG35H ACG36H ACG45H ACG55H Connection B22 C32 B22 C32 B22 C32 B22 C32 B22 C32 B22 C32 B22 C32 B22 C32 Dim A (mm) Dim B (mm) Dim C (mm) 110 160 162 160 185 217 200 250 115 125 115 125 115 125 125 190 135 205 279 394 279 394 394 279 394 394 The CORAT kit is a wall fixing console for gas unit heaters ACGH 16/20/26/28/35/36/45/55. Assembly : See instructions supplied with the consoles. Attention: The CORAT kit can t be used with ACGH 75/95. 10

3-3 Wall mounted console for ACGH 16/20/26/28/35/36/45/55/75/95. Caution: make sure that the bracket is strong enough ACG75H ACG95H Connection B22 C32 B22 C32 Dim A (mm) 135 205 135 205 Dim B (mm) 460 645 Dim C (mm) 460 460 Dim D (mm) 120 135 The COAT kit is a wall-fixing console for gas unit heaters ACGH 16/20/26/28/35/36/45/55/75/95. Assembly: See instructions supplied with the consoles. 3-4 Wall-mounted console for ACGC 20/28/35/45/55/75. CAUTION : this console is not suitable for assembly with dampers or filter Caution: make sure that the bracket is strong enough ACG20C ACG28C ACG35C ACG45C ACG55C ACG75C Connection B22 C32 B22 C32 B22 C32 B22 C32 B22 C32 B22 C32 Dim A (mm) 115 125 115 125 115 125 125 190 135 205 135 205 Dim B (mm) 205 205 230 245 295 410 Dim C (mm) 585 585 585 585 585 585 Dim D (mm) 105 105 105 105 105 120 The COAT kit is a wall-mounted console for gas unit heaters ACGC 20/28/35/45/55/75. Attention: COAT kit can t be used for ACGC 95. Assembly : See instructions supplied with the console. 11

4- ELECTRICAL WIRING 4-1 Electrical schematics of the gas heaters ACGH ACGC Phase/ brown Neutral/ blue Earth/ green- yellow Pilot/ black 4-2 Electrical schematics of centrifugal gas air heaters ACG75 Phase/ brown Neutral/ blue Earth/ green- yellow Pilot/ black 12

4-3 Electrical schematics for the 2 stages gas air heaters and ACGV Phase/ brown Neutral/ blue Earth/ green- yellow Pilot/ black TV RFP Limit Fan Reg Mod CC Blowing fan Pilot wire receiver Excess heat airstat with manual reset Fan triggering airstat Burner regulation airstat Burner modulator airstat (modulation option) Inspection box MVE PA SI EA MOD EVG TI Smoke extractor Burner air pressure switch Ionisation sensor Ignition electrode Gas modulating valve (2 speed option) Gas solenoid valve Isolation transformer Under normal operation, never stop the device by cutting off the electrical power. Wait for the fan to stop Pilot wire receiver card Burner connector Supply connector Fan connection Burner defect Burner reset 13

4-4 Basic connection schematic with pilot wire thermostat 1 2 4 3 Connection of the unit heater :A : Neutral (blue) - B: Phase (brown) - D: pilot wire (black) - C: Earth ( green/ 1 - Switch off proximity items 2 - Unit heaters 4 Regulation and remote control panel 3 - Remote signalling module BSAT4P TFP1 TFP2TE TFP3 - ACG gas unit heaters are equipped as standard with a receiver for pilot wire, which enables using a single conductor to carry the functions of the ambient thermostat, the forced ventilation and remote resetting. - Several models of thermostat (4) are available. The use of these thermostats will provide you with supplementary functions such as remote resetting and forced ventilation. - The remote signalling module is not obligatory, in case of use, disconnect the connector supplied on the unit heater receiving card and replace it by the signalling module cable. Provide a sufficient length of cable for the number of devices on the line. The electrical connection of the devices must be in conformity with the regulations in force in the country concerned. Caution : 6 unit heaters maximum per TFP1 14

4-5 Basic connection schematic using individual thermostat REG110 REG111 REG112 Model : REG110 Individual controller without thermostat. On/off fan switch and remote resetting. Signalling indicator lamps : on, burner defect and excess heat. REG110 Model : REG111 Individual controller with an ambient thermostat with remote resetting. On/off fan switch and remote resetting. Signalling indicator lamps : on, burner defect REG111 REG112 Model : REG112 Individual controller without thermostat. Ambient thermostat with on/off fan switch and remote resetting. Clock programmable. Connecting the unit heater : A : Neutral (blue) - B: Phase (brown) - C: Earth ( green/yellow) ACG gas unit heaters are equipped as standard with a receiver which enables the AIRCALO regulator to be connected directly. Several models of individual thermostats are available: REG110, REG111, REG112, 1 Replace the four conductor supply cable with the three conductor cable supplied with the regulator. 2 Make a connection of individual thermostat REG according to the technical manual Individual control box supplied with the gas unit heaters. 3 Connect the 230 V AC power supply of the unit heater. 15

5 CONNECTING THE EVACUATION CONDUITS 5-1 Evacuation conduit accessories for ACG 20/28/35 1 Concentric telescopic extension 2 Concentric horizontal cup with finishing flap 3 Concentric roof cup 10 1 4 Chimney outlet with moulding 5 Sealed length of 250/500/1000 mm 6 Concentric length of 500/1000 mm 7 Sealed elbow at 45 or 90 4 5 6 3 2 8 Concentric elbow at 45 or 90 9 Flat flashing 7 9 8 10 Tilted flashing with lead strip 5-2 Evacuation conduit accessories for ACG 45/55/75/95 2 Horizontal concentric cup with finishing flap 3 Concentric roof cup 4 Chimney outlet ( moulding not supplied ) 2 7 8 5 Sealed length of 250/500/1000 mm 6 Concentric length of 500/1000 mm 7 Sealed elbow at 45 3 4 6 10 8 Sealed elbow at 90 9 Flat flashing 10 Tilted flashing with lead strip 5 9 5-3 Connecting to the unit heater Correct assembly Incorrect assembly α = 2 NO - Assembly of the smoke conduits must be carried out using a slope opposed to the device, α = 2 minimum. - The assembly of the conduits must be carried out so that no water can penetrate into the device, due to the electrical risk. For this purpose, please use a purge T-piece and a condensate recoverer, - Make sure not to damage the connector seals when assembling the conduits onto the device, check the sealing after assembly. - For greater lengths, it is essential to provide a condensate recoverer; this also applies to assemblies using cups. 16

5-4 Wall mounted concentric cup connection - C12 for ACGH and ACGC unit heaters ( I ) C12 - for ACGH and ACGC 20/28/35 The connections for fuel air inlet and evacuation of smoke are made horizontally at the outside of the building. The KC1280 kit consists of a terminal (1) and two rubber sliding clamps (2) which give a perfect finish. The connection is concentric with a diameter of 80/125 and connects directly onto the unit heater. Side (A) must be between 200 and 350 mm. A length (B) of 820 mm can only be obtained by using the cup. It is possible to shorten, extend or to deviate the cup outlet using accessories such as elbows, straight lengths of 0.5 m or 1 m or the telescopic extensions shown on page 15. CAUTION : The junctions between the tubes must be sealed and rigid. The total length of the circuit must not exceed 6 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. In the case of a greater length, please consult us. I II ( II ) C12 for ACGH and ACGC 45/55/75/95 The connections of the combustion air inlet and the smoke evacuation are to be horizontal, at the outside of the building. The KC12100 kit for ACG45 and KC12130 for ACG55/75/95 consists of two lengths of 250 mm (3) of a terminal (1) delivered with its bi-tubes/concentric transformer connector (4) and two wall mounted finishing plates (2). The diameters of the cups are 100/150 for model 45 and 130/200 for models 55/75/95. These kits are intended for a maximum wall thickness (A) of 270 mm for side B of 550 mm. It is possible to shorten, extend or to deviate the cup outlet using accessories such as elbows, straight lengths of 0.5 m or 1 m shown on page 15. CAUTION : The junctions between the tubes must be sealed and rigid. The total length of the circuit must not exceed 6 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. In case of greater lengths, please consult us. 5-5 Concentric roof cup connection - C32 for ACGH and ACGC unit heaters ( III ) C32 - for ACGH and ACGC 20/28/35 The connections for combustion air inlet and smoke evacuation are vertical through the roof to the outside of the building. The connection is concentric in diameter 80/125 and is connected directly onto the unit heater. The KC3280 kit consists of a roof terminal (1) and a concentric 90 elbow (2). Roof sealing will be carried out using a standard flashing or special flashing depending on the type of roof. The sliding moulding (7) supplied with the terminal enables the flashing to be covered for perfect sealing. The dimension (A) must be at least 250 mm. The terminal with its elbow enables a length (B) of 1195 mm to be obtained, dimension (C) 125 mm. It is possible to shorten, extend or to deviate the cup outlet using accessories such as elbows, straight lengths of 0.5 m or 1 m or telescopic extensions shown on page 15. CAUTION : The junctions between the tubes must be sealed and rigid. The total length of the circuit must not exceed 6 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. In the case of greater lengths, please consult us. III IV ( IV ) C32 - for ACGH and ACGC 45/55/75/95 Connections for the combustion air inlet and the smoke evaluation are made vertically through the roof to the outside of the building. Kit KC32100(ø 100/150 ) for ACG45-1 cup terminal (1) -2 x 90 elbows diameter 100 mm (2) -2 extensions length 250 mm (3) -1 transformation part (4) Kit KC32130 (ø 130/200 ) for ACG55/75/95-1 cup terminal (1) -2 x 90 elbows diameter 130 mm (2) -1 extension length 500 mm (3) -1 extension length 250 mm (3) -1 transformation part (4) It is possible to shorten, extend or to deviate the cup outlet using accessories such as elbows, straight lengths of 0.5 m or 1 m shown on page 15. CAUTION: The junctions between the tubes must be sealed and rigid. The total length of the circuit must not exceed 8 metres, taking into account the fact that an elbow of 90 or 45 corresponds to a length of 1 metre. In the case of greater lengths, please consult us. 17

5-6 Connection to outlet - B22 for ACGC, ACGH unit heaters and ACGV destratificator (V) B22 - for ACGH and ACGC 20/28/35/45/55/75/95 The combustion air is taken directly in the room and the evacuation of the smoke is made vertically through the roof. The kits KB2280 (ø80), KB22100 (ø100) and KB22130 (ø130) consists of: a T-piece with sealed plug (2), length one metre (1), and a roof terminal (3). The kit KB2280 is delivered with a sliding moulding (7). The minimum height of the roof outlet must be the same as the ridge of the roof. The kits for 20/28/35/45 provide for a dimension (B) of 2150 mm, dimension (C) 125 mm. For the 55/75/95 a dimension (B) of 2150 mm, dimension (C) 135 mm. It is possible to extend or deviate the roof outlet using accessories such as elbows and straight lengths of 0.5 m or 1 m shown on page 15. Provide sufficient ventilation. The required new air supply must be at least 100 m 3 /h per unit heater. CAUTION : The section of the smoke conduits must be at least equal to the outlet diameter. Smoke evacuation can only be vertical or at a maximum of 45. The total length of the circuit must not exceed 8 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. A double wall conduit must be provided if the part outside the building is over 2 metres. V VI (VI) B22 - for ACGV 28/35/55/75/95 The combustion air is taken directly in the room and smoke evacuation is made vertically through the roof. The kits KB2280V (ø 80) and KB22130V (ø 130) consists of a sealed elbow at 90 (1), a sealed length 0.5 m (2), a T-piece with sealed plug (3), two lengths of one metre (4) and a chimney cap (5). The kit KB2280V is supplied with a sliding moulding (6). The roof outlet must be as a minimum the same as the height of the roof ridge. Dimension (B) of kits KB2280V and KB22130V is 2150 mm, dimension (C) 630 mm for ACG28/35V and dimension (C) 750 mm for ACG55/75/95V. It is possible to extend or to deviate the roof outlet using accessories such as elbows and straight lengths of 0.5 m or 1 m shown on page 15. Provide sufficient ventilation. The required new air supply must be at least 100 m 3 /h per unit heater. CAUTION : The section of the smoke conduits must be at least equal to the outlet diameter. The smoke evacuation can only be vertical or at a maximum of 45. The total length of the circuit must not exceed 8 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. A double wall conduit must be provided if the part outside the building is over 2 metres. 5-7 Concentric roof cup connection - C32 for ACGV destratificator (VII) C32 - for ACGV 28/35 The connections for combustion air intake and smoke evacuation are made vertically through the roof at the outside of the building. The connection on the device is concentric at Ø 80/125. The kit KC3280V (ø 80/125) consists of a roof terminal (1) and a condensate recoverer (3). The roof sealing must be used using standard flashing or special flashing depending on the type of roof. The sliding moulding (5) supplied with terminal can be used to cover the flashing for perfect sealing. The exterior part must be at least 250 mm, dimension (A), the terminal provides for a total length of 1095 mm, dimension (B). It is possible to shorten, lengthen or to deviate the cup outlet using accessories such as elbows, straight lengths of 0.5 m or 1 m or the telescopic extensions shown on page 15. CAUTION : The junction between the tubes must be sealed and rigid. The total length of the circuit must not exceed 6 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. In the case of greater lengths, please consult us. 18 VII VIII (VIII) C32 - for ACGV 55/75/95 The connections for combustion air intake and smoke evaculation are made vertically through the roof to the outside of the building. The connection on the device uses bi-tubes Ø130 mm. The kit KC32130V (ø 130/200) consists of a roof terminal (1), of a condensate recoverer (2) and of a sealed length of 250 mm (3). Roof sealing is carried out using a standard flushing or special flashing depending on the type of roof. The fixed moulding mounted on the terminal can be used to cover the flashing (minimum dimension of 201 mm maximum dimension of 208 mm), for perfect sealing. The exterior part of the terminal 955 mm dimension (A), interior part 1060 mm dimension (B). It is possible to shorten, extend or to deviate the cup outlet using accessories such as elbows, straight lengths of 0.5 m or 1 m or telescopic extensions shown on page 15. CAUTION : The junction between the tubes must be sealed and rigid. The total length of the circuit must not exceed 8 metres, taking into account that an elbow of 90 or 45 corresponds to a length of 1 metre. In the case of greater lengths, please consult us.

6- GAS CIRCUIT 6-1 Changing gas The unit heaters are equipped with atmospheric gas torch burners, permitting the use of Natural gas G20, Natural gas G25 and Propane. The combustion ports are engineered so as to ensure very good stability of the flame without separation or return towards the injectors. THE SERVICE VISITS MUST BE CARRIED OUT BY A QUALIFIED PROFESSIONAL PERSON. Changing the gas is carried out in the following manner: 1- Disconnect the electrical supply connector and close the gas inlet. 2- Unscrew the gas line fixing nut (Item 1) on the gas valve and also the three screws (Item 2) which retain the injector ramp on the burner block. 3 Change the injectors (see adjustment table). 4 Screw in the new injectors (Item 3) changing the seals (Item 4) and making sure concerning sealing. The injectors must be installed dry. 5 Reassemble the ramp and connect the gas line to the gas valve, replacing the seal, make sure during assembly not to forget, or damage the seal. 6 Check for sealing after assembly. 7 Adjust the gas ramp pressure on the regulator. 4 3 2 1 CAUTION : This operation must be done with the gas and electricity supplies cut off. The adjustment of the gas pressure is made with the burner running Adjusting the gas pressure is done in the following manner: 1 Open the solenoid valve pressure regulating protection screw. 2- Unscrew the pressure test point, connect the pressure gauge (5) 2- Adjust the ramp pressure (6), in accordance with the adjusting table. 6 3- After adjustment, do not forget to put the protective screw back in place and to close the pressure test point. 5 6 Check for sealing after making the adjustment. 19

6-2 Valve adjustment table single speed Types Regulator pressure Adjustment for G20 Adjustment for G25 Adjustment for G31 Gas ramp injectors Washer extractor Regulator pressure Gas ramp injectors Washer extractor Regulator pressure Gas ramp injectors Washer extractor ACG16 9 mbar 4 x AL 1.90 40 12 mbar 4 x AL 1.90 40 25 mbar 4 x AL 1.10 40 ACG20 9 mbar 5 x AL 1.90 40 12 mbar 5 x AL 1.90 40 25 mbar 5 x AL 1.10 40 ACG26 10.4 mbar 6 x AL 1.90 40 13.8 mbar 6 x AL 1.90 40 29 mbar 6 x AL 1.10 40 ACG28 9 mbar 5 x AL 2.20 27 12 mbar 5 x AL 2.20 27 25 mbar 5 x AL 1.30 27 ACG35 9 mbar 6 x AL 2.20 30 12 mbar 6 x AL 2.20 30 25 mbar 6 x AL 1.30 30 ACG36 10.4 mbar 8 x AL 1.90 40 13.8 mbar 8 x AL 1.90 40 29 mbar 8 x AL 1.10 40 ACG45 9 mbar 8 x AL 2.20 none 12 mbar 8 x AL 2.20 none 25 mbar 8 x AL 1.30 none ACG55 9 mbar 10 x AL 2.20 none 12 mbar 10 x AL 2.20 none 25 mbar 10 x AL 1.30 none ACG75 9 mbar 12 x AL 2.20 none 12 mbar 12 x AL 2.20 none 25 mbar 12 x AL 1.30 none ACG95 9 mbar 16 x AL 2.20 27 12 mbar 16 x AL 2.20 27 25 mbar 16 x AL 1.30 30 Gas solenoid valve 20/70 kw Gas solenoid valve 90 kw Regulator pressure adjustment Regulator pressure adjustment Gas Gas Pressure test point Pressure test point 6-3 Modulating valve adjustment table Adjustment for G20 Adjustment for G25 Adjustment for G31 Types Low speed ACG16 6 mbar ACG20 6 mbar ACG26 6 mbar ACG28 6 mbar ACG35 6 mbar ACG36 6 mbar ACG45 6 mbar ACG55 6 mbar ACG75 6 mbar ACG95 6 mbar Regulator pressure High speed 9 mbar 9 mbar 10.4 mbar 9 mbar 9 mbar 10.4 mbar 9 mbar 9 mbar 9 mbar 9 mbar Gas ramp injectors 4 x AL 1.90 5 x AL 1.90 5 x AL 1.90 5 x AL 2.20 6 x AL 2.20 8 x AL 1.90 8 x AL 2.20 10xAL 2.20 12xAL 2.20 16xAL 2.20 Extractor washer Low speed Regulator pressure High speed 40 7 mbar 12 mbar 40 7 mbar 12 mbar 40 7 mbar 13.8 mbar 27 7 mbar 12 mbar 30 7 mbar 12 mbar 40 7 mbar none none none Gas solenoid valve 20 to 75 kw 13.8 mbar 7 mbar 12 mbar 7 mbar 12 mbar 7 mbar 12 mbar 27 7 mbar 12 mbar 8 Gas ramp injectors 7 4 x AL 1.90 5 x AL 1.90 6 x AL 1.90 5 x AL 2.20 6 x AL 2.20 8 x AL 1.90 8 x AL 2.20 10xAL 2.20 12xAL 2.20 16xAL 2.20 Extractor washer Low speed Regulator pressure High speed Gas ramp injectors Extractor washer 40 13 mbar 25 mbar 4 x AL 1.10 40 40 13 mbar 25 mbar 5 x AL 1.10 40 40 13 mbar 29 mbar 6 x AL 1.10 40 27 13 mbar 25 mbar 5 x AL 1.30 27 30 13 mbar 25 mbar 6 x AL 1.30 30 40 13 mbar 29 mbar 8 x AL 1.10 40 none 13 mbar 25 mbar 8 x AL 1.30 none none 13 mbar 25 mbar 10xAL 1.30 none none 13 mbar 25 mbar 12xAL 1.30 none 27 13 mbar 25 mbar 16xAL 1.30 27 Gas solenoid valve 90 kw 8 High speed Gas 7 Low speed 8 High speed 7 Low speed 20 Pressure test point

7- GAS CONNECTION A precise engineering study must be carried out on the diameters of the piping depending on the nature of the gas flow and the length of the piping. Make sure that the pressure drops in the piping do not exceed 5 % of the supply pressure. The gas connections must be carried out in conformity with the requirements concerning interior installations regardless of the type of gas. 7-1 Connection of unit heaters The unit heaters operate with a pressure of between 20 and 25 mbar for Natural gas and 37 mbar for the Propane versions. 1/ The gas supply network pressure corresponds to the entry pressure of the device: - in this case, connect each device with a dam valve item 1 and the gas filter item 2. 2/ The gas supply network pressure is higher than the intake pressure of the device: - in this case, connect each device with a dam valve item 1, a gas filter item 2 and a pressure regulator item 2, to reduce the supply pressure to the unit heater. CAUTION Any supply pressure which is higher than the maximum intake pressure tolerated by the gas solenoid valve will cause irreparable damage to that solenoid valve. To connect the unit heater to the gas network, use the union item 4 with the seal item 5 delivered with the device. Tighten the union onto the network before connecting it to the unit heater. Check that the gas supply circuit is correctly sealed upto the gas solenoid valve. (see schematic). 1 2 3 4 5 Network Check the sealing up to the gas solenoid valve input 8- COMMISSIONING OF GAS UNIT HEATERS 8-1 Operating principle: 1- For the commissioning of the device, turn the regulation to demand. The inspection box tests the air pressure switch contact switch in its at rest position, and then triggers the smoke extractor. Its correct functioning is controlled by the differential air pressure switch which, if there is not enough air, will prevent the control box from following its cycle. 2- After pre-ventilation, the ignition electrode lights up and the gas solenoid valve allows the gas to pass to the injectors. 3- If the air/gas mixture is not ignited or is not detected by the ionisation sensor, the flame control box tries once more and then changes to safety position. 4- Once the burner is ignited, the blowing fan is triggered when the air temperature is higher than the fan airstat regulation value (35 C to 40 C). 5- In the case of a fan malfunctioning, the excess heat safety thermostat cuts off the unit heater burner if the temperature exceeds 90 C. CAUTION : Never stop the device before the fan has totally stopped. The lack of cooling can necessitate the excess heating airstat to be reset and can damage the heat exchanger over the long term. 21

8-2 Bill of material Detail of RFP card 4 19 17 25 16 15 14 12 13 Detail of connections ACG 20 / 28 / 35 1 23 22 2 3 ACG 45 / 55 / 75 / 95 1 2 20 21 5 24 6 18 8 7 11 9 10 3 No. Description Spare parts part number ACG20 ACG28 ACG35 ACG45 ACG55 ACG75 ACG95 1 Smoke outlet ATE131 ATE131 ATE131 ATE004 PF329 PF329 PF329 2 Extractor washer ATE167 ATE168 ATE169 3 Air inlet ATE132 ATE132 ATE132 ATE004 PF329 PF329 PF329 4 Helicoidal fan for ACGH ATE223 ATE123 ATE192 ATE118 ATE119 ATE108 2 x ATE119 4 Centrifugal fan for ACGC ATE065 ATE061 ATE061 ATE063 ATE063 ATE194 5 Gas inlet ATE212 ATE212 ATE212 ATE212 ATE212 ATE213 ATE213 6 Gas tube GAZ0102 GAZ0102 GAZ0102 GAZ0102 GAZ0102 GAZ0102 GAZ0102 7 Gas S/V with pressure regulator ( 1 Al. ) GAZ0011 9EL0070 Gas S/V with pressure regulator ( 2 Al. ) GAZ0007 PB509 8 Upstream gas pressure test point 9 Ramp pressure test point 10 Gas ramp 11 Ignition electrode ATE021 + ATE023 12 Ionisation sensor ATE022 + ATE024 ATE022 + ATE025 13 Inspectioni and safety box ATE318 ATE318 ATE318 ATE318 ATE318 ATE318 ATE318 14 Burner regulation airstat (65 C) ATE146 ATE146 ATE146 ATE146 ATE146 ATE146 ATE146 15 Fan airstat (30 to 35 C) ATE146 ATE146 ATE146 ATE146 ATE146 ATE146 ATE146 16 Excess heating airstat with reset (100 C) ATE147 ATE147 ATE147 ATE147 ATE147 ATE147 ATE147 17 Lack of air pressure switch ATE204 ATE204 ATE204 ATE204 ATE204 ATE204 ATE204 18 Smoke box SE0411 SE0420 SE0403 SE0430 SE0439 SE0448 SE0462 19 Smoke extractor ATE002 ATE002 ATE013 ATE013 ATE013 ATE112 ATE113 21 Burner reset 22 Regulation connector 23 5A unit heater protecting fuse ATE201 ATE201 ATE201 ATE201 ATE201 ATE201 ATE201 24 Pilot wire receiver ATE248 ATE248 ATE248 ATE248 ATE248 ATE248 ATE248 25 Airstat 2 nd speed (25 to 30 C) ATE146 ATE146 ATE146 ATE146 ATE146 ATE146 ATE146 22

9-MAINTENANCE Correct and regular use and maintenance of the unit heater will determine rational and efficient operation, minimum consumption as well as long life. The maintenance must be done with the device cold, with the gas and electricity supplies cut off. These service visits must be carried out by a qualified professional person Parts Unit heater Maintenance operations Check the correct functioning of all the safety devices and verify that all the screws are correctly tightened. Heat exchanger, smoke extractor and venturi Get access to the heat exchanger by disassembling the burner and smoke boxes, clean it. Clean the extractor and the venturi via the rear smoke connection. Fan Clean with compressed air Smoke conduit Disassemble the conduit and sweep it out Blowing cases and grilles with adjustable vanes Clean using a duster Burner torches Disassemble the burner ramp, check their condition and clean them Injectors Clean the gas injectors Ionisation sensor and electrodes Check their condition, change them if necessary. Gas filter Disassemble the dirty cartridge and clean it with compressed air 10- RECOMMENDATIONS FOR THE USER Precautions to be respected : - Never obstruct the evacuation of the smoke and the intake of new air. - Never make any modifications to the adjustments which have been carried out by the qualified professional person. - Never spray any water onto the gas heater - Warn the after-sales technician when there is a change of gas, of gas pressure or a modification of the power supply voltage. You are strongly recommended to take out a maintenance contract: see with your installer. What should be done in case of problems? PROBLEMS Smell of gas REMEDIES - Close the external gas valve and the electrical supply then warn the maintenance technician. The burner stays in safety position (burner defect indicator lamp is lighted) - Press the reset button of the burner located on the thermostat control box. - If the problem persists, contact the after-sales technician. 23

11- TROUBLESHOOTING In case of problems, make sure that the conditions required prior to operating the unit heater are present. If the control box is in the safety position (with the burner defect indicator lamp lighted up), reset it. CAUTION : All electrical or mechanical operations must be carried out when the electrical supply is cut off and the gas supply is closed. Defect Cause Remedy The device does not start - Incorrect wiring - No voltage -The ambient thermostat is not triggered - The pilot wire receiver switch is not in the automatic position Excess heat safety airstat triggered. - Check the wiring - Verify the electrical supply - Increase the setting point of the ambient thermostat - Check the position of the receiver switch in the unit heater - Reset the airstat The burner preventilates continuously -Extractor defective -Air pressure switch disconnected -Air pressure switch defective - Replace the extractor - Reconnect the pressure air pipes - Replace the air pressure switch The ignition electrode is making sparks, the burner lights, the control box goes into safety position (burner defect indicator lamp lighted up) The device goes into safety position during operation (red light comes on) -Gas solenoid valve defective -Control box defective -Ionisation sensor out of adjustment or defective -Air in the piping -No gas -Gas supply interrupted - Replace it - Replace it - Adjust it or replace it - Bleed the piping - Check the pressure - Reset by pressing the red push button on the control box Cold air when starting -Incorrect adjustment of internal thermostat - Check the adjustment of the ventilation thermostat (adjustment 35 C) The device does not heat sufficiently -Incorrect placing of the thermostat -Incorrect adjustment of the thermostat -Insufficient gas pressure -Injectors are unsuitable - Modify its location - Check the thermostat - Check the gas supply pressure - Check that the injectors are correctly selected and replace them if necessary. The device never stops -The thermostat is set too high or is defective - Incorrect wiring - Lower the setting point or replace it - Check the wiring 24