Potterton A-Cubed Installation, User And Maintenance Manual Download

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Installation, user and maintenance manual

– GAHP-A

Figure 5.18

– Button connection for fl ame controller reset

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Black

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Blue

Red

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Pink

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Reset

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Blind

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Summary of Contents for A-Cubed

Page 1: ...Working towards a cleaner future A Cubed Gas absorption heat pump Installation user and maintenance manual This manual must be kept with the appliance August 2010 ...

Page 2: ... manual other than for personal consultation must be previously authorised by Potterton Commercial The rights of those who have legitimately filed the registered trademarks contained within this publication are not affected With the aim of continuously improving the quality of its products Potterton Commercial reserves the right to modify the data and contents of this manual without prior notice ...

Page 3: ...4 2 POSITION OF THE APPLIANCE 25 4 3 HYDRAULIC CONNECTIONS 28 4 4 GAS SUPPLY 30 4 5 CONDENSATE DISCHARGE CONNECTION 31 4 6 FILLING OF HYDRAULIC CIRCUIT 32 4 7 FLUE INFORMATION 33 4 8 PROGRAMMING OF HYDRAULIC PARAMETERS 34 5 ELECTRICAL SYSTEM INSTALLATION TECHNICIAN 37 5 1 ELECTRICAL DIAGRAMS OF THE APPLIANCE 40 5 2 HOW TO CONNECT THE APPLIANCE ELECTRICALLY 41 5 3 CASCADE CONTROL 41 5 4 TYPE C Cons...

Page 4: ...4 ...

Page 5: ...s own requirements SECTION 4 is intended for use by the hydraulic installation technician it provides the indications necessary for the technician for the creation of the hydraulic circuit flue gas and gas supply system SECTION 5 is intended for use by the electrical installation technician it provides the information required to hook up the appliance electrically SECTION 6 is intended for use by ...

Page 6: ...mp GAHP A CCP Comfort Control Panel CCI Comfort Control Interface device DDC digital control panel Direct Digital Controller The icons present in the margin of the manual have the following meanings DANGER WARNING NOTE START OF OPERATING PROCEDURE REFERENCE to another part of the manual or other document ...

Page 7: ...ondensationboilerswithnominalthermalcapacity no greater than 70 kW The absorption heat pumps of the GAHP series emit values of nitrogen oxide NOx less than 60 mg kWh Safety The appliance must only be used for the purposes for which it has been designed Any other use is considered inappropriate and therefore dangerous The manufacturer does not accept any contractual or extra contractual liability f...

Page 8: ...untry of installation i e by professionally qualified personnel Professionally qualified personnel means personnel with specific technical competence in the sector of heating cooling plants and gas appliances Installation of the appliance must be carried out in compliance with current local and national regulations regarding the design installation and maintenance of heating and cooling plants in ...

Page 9: ...nce must never normally be switched on and off by shutting off the power supply upstream of the Controle Device CCP DDC or consent switch before having used the latter first and waited for the shutdown cycle to end approximately 7 minutes The shutdown cycle terminates when the hydraulic pump switches off no parts in motion Shutting off the power supply while the appliance is running can irreparabl...

Page 10: ...erature heating systems radiators fan coils it produces hot water to 65 C for heating purposes and up to 70 C for sanitary hot water Version LT optimised for low temperature floor heating systems it produces hot water to 55 C for heating purposes and up to 70 C for sanitary hot water The GAHP heat pump can be controlled with the Direct Digital Control or with a switch on the consent circuit During...

Page 11: ...119 1 Thermal power kW 27 5 1 OPERATING POINT A 7W50 G U E gas usage efficiency 125 Thermal power kW 31 5 Thermal capacity Nominal 1013 mbar 15 C kW 25 7 true peak kW 25 2 NOx emission class 5 NOx emission ppm 25 CO emission ppm 36 Hot water delivery temperature maximum for heating C 65 maximum for ACS C 70 Hot water return temperature maximum heating C 55 maximum for ACS C 60 minimum C 2 Hot wate...

Page 12: ... Size width mm 848 6 height mm 1281 6 1537 6 depth mm 1258 Weight In operation kg 390 400 GENERAL INFORMATION INSTALLATION MODE B23P B33 B53P COOLING FLUID AMMONIA R717 kg 7 WATER H2O kg 10 MAXIMUM PRESSURE OFTHE COOLING CIRCUIT bar 35 2 5 DIMENSIONS AND SERVICE PANEL Figure 2 1 Size Standard ventilation Front and side views dimensions in mm ...

Page 13: ...nd maintenance manual GAHP A 13 Figure 2 2 Size Front and side views dimensions in mm Figure 2 3 Service plate Hydraulic gas unions detail LEGEND G Gas fitting Ø F I Inlet water fitting Ø 1 F O Outlet water fitting Ø 1 F ...

Page 14: ...14 ...

Page 15: ...r exclusively by operating the DDC In this case refer to the manual supplied with it The appliance must never normally be switched on and off by shutting off the power supply upstream of the DDC before having used the latter first and waited for the shut down cycle to end approximately 7 minutes The shutdown cycle terminates when the hydraulic pump switches off no parts in motion Shutting off the ...

Page 16: ...RATIONS AND MANUAL DEFROSTINGon page 19 After it is reset the appliance will make a new attempt to activate If the appliance locks out several times contact a Potterton Commercial Engineer by calling the Technical Department of Potterton tel 0845 070 1057 Shut down Switch off the appliance via the on off command placing it in the OFF position The shutdown cycle takes approximately 7 minutes to com...

Page 17: ...resent or a DDC if present The Mod10 controller see detail D in Figure 3 1 On board controller on page 17 is used for combustion modulation Figure 3 1 On board controller S61 Mod10 LEGEND A 4 digit display B Knob C CAN port D Mod10 controller Description of menu of S61 controller The parameters and settings of the appliance are grouped in the menus shown on the controller s display Table 3 1 Menu ...

Page 18: ... may currently be selected but not used Display and knob The controller s display can be viewed through the glass of the viewing hole on the front panel of the appliance Upon activation all of the LEDs of the display light up for approximately three seconds andthenthenameoftheboard S61 appears Afteraround15secondsaftertheappliance powers up the appliance starts running if the required consent is a...

Page 19: ...us level For example to quit the menus turn the knob to scroll through menus 0 1 2 etc until the controller displays the quit screen E now press the knob to quit In the case of menus 0 and 1 the user can view any parameter For information about menu 2 refer to Section 3 3 RESET OPERATIONS AND MANUAL DEFROSTING on page 19 To set the parameters of menu 3 refer to Section 4 8 PROGRAMMING OF HYDRAULIC...

Page 20: ...HUT DOWN on page 15 when the appliance is in a permanent locked condition or after a long period of disuse see Section 3 5 PROLONGED PERIODS OF DISUSE on page 22 You will need access to the electrical panel see Section Display and knob To reset the flame control unit select menu 2 as indicated in the Section Accessing the Menus then proceed as follows 1 The display shows 2 Press the knob to access...

Page 21: ...ual defrosting command select menu 2 as described in the Section how to access the menus then proceed as follows 1 The display shows 2 press the knob to access the menu The display initially shows item 2 20 2 Turn the knob clockwise to display 2 22 3 Press the knob to display the manual defrosting flashing request deFr 4 Press the knob again to execute the command The manual defrosting request sto...

Page 22: ...expected to remain inactive for a long period If you wish to disconnect the appliance during the winter one of the following three conditions must be met 1 Make sure that the hydraulic circuit connected to the appliance contains an adequate percentage of glycol antifreeze see Section 4 6 FILLING OF HYDRAULIC CIRCUIT on page 32 and Table 4 2 Percentage of monoethylene glycol on page 33 2 Emptythehy...

Page 23: ...M winter temperature in the area of installation see Table 4 2 Percentage of monoethylene glycol on page 33 bring the circuit to the correct pressure making sure that the pressure of the water in the plant is not less than 1 bar and not over 2 bar You will need the appliance disconnected from the electricity gas supply 1 Open the plant gas supply valve to the appliance and make sure that there is ...

Page 24: ...24 ...

Page 25: ...an area in which air circulates naturally and which does not require any particular protection from the weather In no case must the appliance be installed inside a room The front of the appliance must be at least 80 cm away from walls or other fixed constructions the right and left sides must have a minimum clearance of 45 cm the minimum rear clearance from walls is 60 cm see Figure 4 2 Clearances...

Page 26: ...ce can be installed at ground level on a terrace or on a roof if compatible with its dimensions and weight The dimensions and weight of the appliance are given in Table 2 2 GAHP A HT technical data on page 13 MOUNTING BASE Always position the appliance on a flat level surface that is made of fireproof material and able to sustain the weight of the appliance itself In addition provide a small conta...

Page 27: ... GAHP A LT technical data on page 12 or Table 2 2 GAHP A HT technical data on page 13 Create a containing step and a suitable drainage channel for the water providing a gangway around the appliance for maintenance purposes Although the appliance produces vibrations of limited intensity the use of antivibration mounts available as accessories see Section 7 ACCESSORIES on page 65 is strongly recomme...

Page 28: ...ensate To prevent icing in the primary circuit in the winter the appliance is equipped with an antifreeze device that activates the external water circulation pump of the primary circuit if controlled by the appliance and the burner of the appliance itself when necessary It is therefore necessary to ensure a continuous supply of electricity and gas to the appliance throughout the whole of the wint...

Page 29: ...n page 29 The way the installation is operated can be the cause of possible degradation of water quality Itisadvisedtocheckregularlythewaterquality especiallyincaseofautomaticorperiodic top up In case water treatment is needed this operation should be carried out by a professional or competent person following strictly the instructions by the manufacturer or supplier of the chemical substances for...

Page 30: ... APPLIANCE located on the water inlet pipe of the appliance flowing towards the appliance variable rate WATER CIRCULATION PUMP FOR PLANT WITH SEVERAL APPLIANCES each appliance should have a pump flowing towards the appliance PLANT FILLING SYSTEM if automatic filling systems are used a seasonal check of the percentage of monoethylene glycol in the plant is recommended Theoperationsnecessaryforcommi...

Page 31: ... piece of pipe is attached During transport the pipe is stored inside the unit s left mounting bracket at the front of the appliance To install connect the pipe proceed as follows 1 Pass the pipe through the hole in the left mounting bracket see Figure 4 3 Position of condensate discharge and manual reset fumes thermostat on page 35 2 Connect the tube to a plastic condensate discharge manifold of ...

Page 32: ...llowing stages You will need the appliance connected hydraulically and electrically 1 Activate the automatic air bleeding valves present in the plant and open all thermostatic valves 2 Fill the hydraulic circuit ensuring the minimum water content in the plant and adding if necessary to the plant water free of impurities a quantity of monoethylene glycol in proportion with the minimum winter temper...

Page 33: ... and the consequent increased drop in pressure of the appliance and of the circuit of the plant according to the percentage of monoethylene glycol ThisTable 4 2 Percentage of monoethylene glycol on page 33 should be taken into account for the sizing of the pipes and the circulation pump for calculation of internal pressure drops of the appliance refer to the Table 2 1 GAHP A HT technical data on p...

Page 34: ...e outlet LEGEND A Elbow 90 Ø 80 B Pipe Ø 80 Lg 300 mm w terminal C rain cover 4 8 PROGRAMMING OF HYDRAULIC PARAMETERS The operations described in this paragraph are necessary only if the appliance is not connected to a DDC or to a CCP If the appliance is connected to a DDC follow the instructions given in the DDC manuals exclusively This paragraph explains how to set the hydraulic parameters on th...

Page 35: ...set point temperature At this point if the power modulation is not active parameter 181 it switches off The temperatureofthewatergoesdownagainuntilitreachesthetemperaturecorresponding to set point differential when this is reached the appliance switches on again Example Thermostating reading from inlet sensor Parameter 181 0 power modulation NOT active Set point 40 0 C Differential 2 0 C The appli...

Page 36: ...the parameter Press the knob to confirm the value selected the display shows the current parameter again 3 161 The new value for this parameter has been set 4 If other parameters are to be modified proceed as described previously and then exit from the menu by pressing the knob on the letter E To exit the menu turn the knob clockwise until E is displayed then press it to confirm For details regard...

Page 37: ...installation that is incorrect or that does not comply with current legislation Figure 5 1 Electronic board S61 on page 37 and Table 5 1 Electronic board S61 on page 38 detail the S61 controller s inputs and outputs The supplementary controller Mod10 is shown in detail in Figure 5 2 Mod10 controller on page 39 The appliance and the system can be controlled and regulated in one of the following way...

Page 38: ...d gas probe input JTAG S61 controller programming connector MAIN 230V L N S61 controller power 230V AC N O contact Pump contact N O P7 R W Y o Consent inputs P8 GND L H CAN BUS connector PUMP 230V L N Hydraulic pump power output SPI Communication port with Mod10 controller SRT1 Hydraulic pump rotation sensor input SRT2 Hot water flowmeter input E3 A GS WS TA Ambient temperature probe input TA1 Inp...

Page 39: ...Primary circuit hot water pump control output 0 10 V E3 A GS WS CPMP Cold side water pump control output E3 GS WS NC1 C1 Status indication of locking warnig error CN5 Blower control J82 W10 auxiliary controller connector J83 W10 cable shielding connection W10 CN1 Inputs 0 10V not used Figure 5 3 Direct Digital Control DDC LEGEND DDC Direct Digital Control ...

Page 40: ...Generator limit thermostat FM Flowmeter only for E3 A FL Flowmeter only for GAHP A CWS Condensation water sensor VD Defrosting valve TM Thermostat for electromagnet FAN Fan C Fan capacitor not in the low noise unit EM Electromagnet TS Winter kit thermostat RS condensation siphon resistance FS condensation pipe resistance RG Gas valve resistance THRC Hot water delivery temperature probe THMC Hot wa...

Page 41: ...efficient earthing system executed in accordance with current safety regulations BS7671 17th edition Do not use gas pipes to ground electrical appliances Figure 5 5 Electrical wiring diagram Example of connection of appliance to 230 V 1 N 50 Hz electricity supply LEGEND TER terminal board L phase N neutral Components NOT SUPPLIED GS general switch 5 3 CASCADE CONTROL This paragraph illustrates the...

Page 42: ...t more than one DDC on the same network up to a maximum of 3 Figure 5 6 Example of CAN BUS Terminal nodes and intermediate nodes LEGEND A CCP or DDC B C D Appliance 1 4 Terminal nodes 2 3 Intermediate nodes What is the CAN bus cable The CAN bus cable must meet the Honeywell SDS standard Table 5 2 CAN BUS cables type on page 42 gives details of some types of CAN bus cable grouped according to the m...

Page 43: ...gment of CAN bus cable for INTERMEDIATE NODES if required Before working on the electrical panel of the appliance make sure that it is not connected to the power supply 1 Cut a length of cable long enough to allow it to be installed without kinking 2 Having chosen one end of the length of cable remove the sheath from a length of approximately 70 80 mm taking care not to cut the shielding metallic ...

Page 44: ...n the orange connector on the board set the jumpers as shown in detail B of Figure 5 8 Electrical wiring diagram on page 44 Figure 5 8 Electrical wiring diagram Connection cable CAN BUS to electronic board detail A case terminal node detail B case intermediate node LEGEND SCH electronic board GND Common data L Data signal LOW H Data signal HIGH J1 Jumper CAN BUS in board A Detail case terminal nod...

Page 45: ...and wires contained inside 5 Roll the shielding and connect it to a 4 mm eyelet terminal as illustrated in Figure 5 9 Connection from CAN BUS to connector P8 on page 46 details C and D Now proceed as follows 6 If the DDC is an terminal node connect the three coloured wires to the orange connector P8 following the diagram provided in detail A of Figure 5 10 detail wires and jumpers J21 terminal int...

Page 46: ...l case terminal node 3 wires J21 jumper closed B detail case intermediate node 6 wires J21 jumper open H L GND data signal wires How to connect the DDC The DDC requires a low voltage power supply 24 V with a 230 24 V AC 50 Hz safety transformer the minimum power requirement is 20 VA For the connection use a cable with the minimum specifications 2 x 0 75 mm2 Connect the DDC to the transformer via t...

Page 47: ...l 3 of the DDC s 4 pole connector must always be grounded r 0 1Ω 4 On completion close the DDC s back panel with the 4 bolts The DDC is equipped with a backup battery which retains the memory settings in case of power failure The backup battery lasts approximately 7 years after which time it must be replaced by an authorised Potterton Commercial Technical Engineer Figure 5 11 DDC electric supply D...

Page 48: ...nnection cable CAN BUS between one DDC and one unit LEGEND DDC direct digital control SCH electronic board S61 J1 Jumper CAN BUS in board S61 J21 Jumper CAN BUS in board DDC A terminal nodes connection 3 wires J1 e J21 closed H L GND data signal wires rif cables table ...

Page 49: ...l control SCH electronic board S61 J1 Jumper CAN BUS in board S61 J21 Jumper CAN BUS in board DDC A terminal nodes connection 3 wires J1 e J21 closed B intermediate node connection 6 wires J1 closed H L Gnd data signal wires rif cables table How to connect the plant water circulation pump It is possible to control the pump of the plant either from the appliance s controller or independently ...

Page 50: ...e controller with power absorbed by the pump of more than 700 W If the power absorbed by the pump is more than or equal to 700 W make the connection as shown in Figure 5 15 Electrical wiring diagram see page 51 using a control relay In this case it is necessary to OPEN the jumper J10 located at the bottom left of the controller above the NO Contact contacts positioning it as shown in detail A of t...

Page 51: ...nic board TER terminal board J10 jumper open N O CONTACT clean exit normally open L phase N neutral Component NOT SUPPLIED CS ON OFF control switch PMP water pump 700W KP control pump relay GS general switch If several appliances are connected on the same hydraulic circuit it is always necessary to provide a safety transformer secondary SELV and a respective control relay make the connections acco...

Page 52: ...ard J10 jumper open N O CONTACT clean exit normally open L phase N neutral Components NOT SUPPLIED PMP water pump KP control pump relay GS general switch PTR safety transformer SELV IP bipolar pump switch Independent control of the pumps If it is intended to manage the operation of the plant water circulation pump separately it is necessary to provide a delayed relay with a de excitation time of 1...

Page 53: ...he last wire to be pulled away if the mains cable should accidentally be pulled and will thus guarantee the ground connection The electrical safety of the appliance is guaranteed only when it is correctly connected to an efficient grounding system executed in accordance with current safety regulations Do not use gas pipes to ground electrical appliances How to connect the consent switch You will n...

Page 54: ...the unit s electrical panel Connect the button as instructed below You will need the appliance disconnected from the electricity supply 1 The cable required to connect the reset button must be 3x0 75mm2 2 Cut a suitable length of cable 3 Connect the cable to the blind terminals A see Figure 5 18 Button connection for flame controller reset on page 55 The cable may not be longer than 20 metres Inco...

Page 55: ... manual GAHP A 55 Figure 5 18 Button connection for flame controller reset LEGEND 1 White 2 Grey 3 Orange 4 Green 5 Yellow Black 6 Black 7 Yellow Green Ground 8 Brown 9 Blue 10 Red 11 Violette 12 Pink PLS Reset button A Blind terminals ...

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Page 57: ...n parameters 3 Regulating the plant operating parameters Preliminary verification of plant compliance The Potterton Commercial Engineer must Check that the whole plant has been manufactured in accordance with its design following the instructions supplied by the manufacturer and respecting current legislation The design must have been drawn up by a qualified self employed professional person Check...

Page 58: ...switch Situations attributable to defects or failures of the appliance that took place during its transport or installation Smell of gas due to probable leaks from the plant itself and in any case all situations that are due to non compliant plants considered potentially hazardous Anomalous plant situations If one of the following situations exists the Potterton Commercial Engineer may carry out t...

Page 59: ... Network gas pressure on page 59 If the static mains pressure is greater than 50 mbar DO NOT switch on the appliance 3 Give the consent signal for operation 4 After a few seconds of operation check that the dynamic mains pressure is in line with the values given in Table 6 1 Network gas pressure on page 59 Figure 6 1 Gas valve Gas valve Honeywell VK 4115V LEGEND A Plug B Key Torx TX40 C screw adju...

Page 60: ...otentiality line with tolerance of 0 3 0 0 Example G20 gas if at point 4 a content of CO2 equal to 9 2 was detected at point 6 there must be a value of 9 2 0 4 with tolerance of 0 3 0 0 on the delta value i e a value in the range of 8 8 8 5 7 If this is not the case remove cap A from the gas valve see Figure 6 1 Gas valve on page 59 and use a Torx TX40 wrench to act on screw C in Figure 6 1 Gas va...

Page 61: ...ansing of the water filters Inspecting the condensate siphon and removing any foreign substances Checking that the oil pressure pump is operating correctly Checking the oil level Checking the transmission belts replacement every 5 years or 10 000 hours of operation Checking the ignition and flame detector system Checking the operation of internal components safety and regulation equipment Analysis...

Page 62: ...etween the venturi tube and the gas valve see detail F of Figure 6 2 Gas changeover on page 63 is correctly installed 8 Replace the white gasket between the blower and the burner 9 Reinstall the blower gas valve assembly to the burner with the 4 bolts E taking care not to damage the white gasket 10 Reconnect the gas pipe to the gas valve 11 Replace the sticker indicating the type of gas for which ...

Page 63: ...HP A 63 Figure 6 2 Gas changeover Gas changeover LEGEND A Gas valve B O ring C O ring D Gas nozzle E Fixing screws F Red silicon pipe G Fixing screws H Manual reset fumes thermostat M Sticker stating type of gas for which appliance is configured ...

Page 64: ...64 ...

Page 65: ...00 l O SRB002 Thermal tank three fittings 1000 l O SRB003 VALVES Flow regulator valve O VLV001 Only for E3 3 way valve DN20 Kvs 6 3 O VLV004 3 way valve DN25 Kvs 10 O VLV005 3 way valve DN32 Kvs 16 O VLV006 3 way zone ball valve 1 1 4 O VLV002 3 way zone ball valve 1 1 2 O VLV003 GLYCOL ANTIFREEZE Glycol antifreeze and corrosion protection for hot cold hydraulic systems O GLC006 5 liters tank REGU...

Page 66: ...66 ...

Page 67: ... may be performed from the CCI DDC or from the S61 board via menu 2 parameter 21 If the code persists contact authorised PottertonTAC u 412 FLAME CONTROL UNIT ARREST Failure to ignite burner Reset occurs automatically when the solenoid valve opens again new ignition attempt or if the code persists for 5 minutes E 412 FLAME CONTROL UNIT ARREST Flame arrest signal Reset may be performed from the CCI...

Page 68: ...s 18 C in this case the flame controller and then the circulator switch off u 480 INCOMPLETE PARAMETERS Incomplete parameters The code remains until operating parameters are entered and completed Contact authorised PottertonTAC If the board is replaced Code E_80 may appear this means that the unit s characterisation parameters have not been set E 80 480 INVALID PARAMETERS Invalid parameters or dam...

Page 69: ...ics INSPECTION PROCEDURE Before starting the inspection of the safety valve the unit must be switched off Remove the electric and gas power supplies and operate on each unit of the appliance as follows Electrically isolate the unit External master switch in OFF position and isolate the supply 1 Remove the front and upper panel of the unit 2 Identify the valve which lies behind the levelling chambe...

Page 70: ...VLV105 The manufacturer guarantees the safety of operation and only when equipped with original spare parts In the case of replacement the use of original spare parts is recommended see codes in Table 8 3 The manufacturer is exempt from any contractual or extra contractual responsibility for damage caused by the use of non original spare parts INSPECTION PROCEDURE Before starting the inspection of...

Page 71: ... connectthecablestothetwoconnectors payingattentiontocoverthecontacts completely with the two red silicone protections 7 Re mount the front panel of the unit Figure 8 3 Inspection of generator limit thermostat Thermostat detail Figure 8 4 Safety valve kit Necessary components LEGEND n 1 Safety valve n 1 O Ring n 1 Litmus test The components subject of the intervention are represented in Figure 8 5...

Page 72: ...MOVE THE COMPONENTS DISTINGUISHED BY THE WAX SEAL Figure 8 6 Removing the safety valve Safety valve disassembly LEGEND A Keep fixed B Rotate clockwise 4 Loosen the inspection valve in the direction indicated in detail 2 of Figure 8 6 Removing the safety valve on page 72 until complete assembly as indicated in Figure 8 7 Removing the movable safety valve on page 73 paying attention not to loosen pa...

Page 73: ...igure 8 8 O ring on page 73 Figure 8 8 o ring View of the underside LEGEND Detail o ring 6 Tighten part B of the inspection valve to part A see Figure 8 9 inspection valve on page 73 Figure 8 9 Inspection valve In particular A is a fixed part and B is a removable part LEGEND A Fixed part B Detachable part 7 Tighten the valve applying a torque of 62 Nm ...

Page 74: ...sequently immediate overheating of the generator This is caused by the interruption of the water ammonia solution evaporation process 2 Production of rust which detaching from the internal walls of the hermetic circuit rapidly blocks the circulation of refrigerant fluid thus blocking the orifices of the restrictors Thissituationleadstoalackofwater ammoniasolutiontobeevaporated in the generator and...

Page 75: ...Installation user and maintenance manual GAHP A 75 ...

Page 76: ...Baxi Commercial Division Wood Lane Erdington Birmingham B24 9QP Email andrews baxigroup com www andrewswaterheaters co uk Sales 0845 070 1056 Technical 0845 070 1057 ...

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