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1. Cause Troubleshooting Remedy 1 The heat pump s control Check the ROOM and CURVE MIN MAX CURVES CURVEO Adjust incorrect values in the heat pump s computer is not set adjus CURVE 5 and HEAT STOP settings control computer ted to the customer s re ROOM Desired indoor temperature quirements wishes CURVE Should be set so that the desired indoor temperature ROOM is maintained regardless of the outdoor temperature MIN Lowest set point value on the supply line regardless of the outdoor temperature on the condition that heat stop does not apply MAX Highest set point value on the sup ply line regardless of the outdoor tempera ture CURVE5 0 5 The supply temperature can be adjusted up or down 5 C at these out door temperatures HEAT STOP Stops all production of heat when the outdoor temperature is the same as or greater than the set value To exit heat stop the outdoor temperature must drop to 3 C below the set value 2 Incorrectly positioned Check that outdoor sensors and any room sensors are in Check that the room sensor is posi installed sensors stalled according to the instructions and that they are cali tioned in a suitable place that is repre brated sentative of the building and calibrate it if necessary Avoid placing near ex ternal doors windows and heat sour ces Install the outdoor sensor according to the instructions and calibrate it if nec essary2. Thermia V rmepumpar VIIFM102 Service Instructions Atec Problem The heat pump runs and runs but never stops Thermia Cause Troubleshooting Remedy 1 Air in the heating system Listen for air in the heat pump and heating system Bleed the heating system according to the installation instructions 2 Changed conditions Have you increased your heating and or hot water demand Ifthe heat pump has been dimensioned for a certain demand and this demand is increased the heat pump might not be able to maintain the desired room tem perature If hot water consumption increases a larger propor tion of time is used to produce hot water which means less time for heat production If the heat pump cannot cope with the de mand replace it with one with a higher output or supplement it with a higher out put auxiliary heater 3 Lack of refrigerant not enough refrigerant in the system Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant Follow the correct procedure depending on type of refrigerant to add the correct amount of refrigerant If there appears to be a leak in the refriger ant circuit carry out leak tracing and any necessary corrective action If leak tracer is not available brush soap water on the sus pected leak and look for bubbles Also check for oil as this can come out from the refrigerant c
3. Clean the strainer if necessary 2 The compressor cannot run due to an alarm Check the alarm that is indicated in the display Rectify the problem and rest the alarm See section Alarm 3 Incorrect flow over hot side of the heat pump Measurement check what the difference between the sup ply and return line is using a thermometer At The differ ence should be about 8 C can vary depending on refriger ant A lower At results in reduced efficiency in the heat pump Adjust the system to obtain the correct At 4 The heat pump s control computer is not set adjus ted to the customer s re guirements wishes Check the ROOM and CURVE and MIN settings Adjust incorrect values in the heat pump s control computer ROOM Desired indoor temperature CURVE Should be set so that the desired indoor temperature ROOM is maintained regardless of the outdoor tem perature MIN Lowest set point value on the supply line regardless of the outdoor temperature VIIFM102 Thermia Varmepumpar Service Instructions Atec Thermia Cause Troubleshooting Remedy 5 The interval for peak heat operation has changed toa lower value than the factory set value This results in the heat pump going into peak heat operation more often than calculated Check the specified interval for peak heat operation in the control computer If there is a shorter interval between the peak heat pro
4. Danfoss can accept no responsibility for possible errors in catalogues brochures and other printed material Danfoss reserves the right to alter its products without notice This also applies to products already on order provided that such alterations can be made without subseguential changes being necessary in specifications already agreed All trademarks in this material are property of the respective companies Thermia V rmepumpar and the Thermia V rmepumpar logotype are trademarks of Danfoss A S All rights reserved VIIFM102 Produced by Thermia V rmepumpar Aug 2013
5. Pressure transmitter fault opens at a higher pressure than If the pressure transmitter breaks too early opens too soon indicated Check break pressure using the manometer ap replace it paratus 3 Lack of refrigerant not Using manometer apparatus and thermometer check that Follow the correct procedure depending enough refrigerant in the the unit s overheating is correct for the specific refrigerant on type of refrigerant to add the correct system amount of refrigerant If there appears to be a leak in the refriger ant circuit carry out leak tracing and any necessary corrective action Thermia Varmepumpar VIIFM102 Service Instructions Atec nm N Cause Troubleshooting Remedy 4 Drying filter blockage Check the temperature difference above the drying filter A difference of max 1 C is permissible If the difference is greater the filter is blocked Take a reading during opera tion If the drying filter is sealed replace it 5 Blocked evaporator on the refrigerant side Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant If the evaporator is thought to be blocked by oil for example try blowing nitrogen through it to release the oil If this does not work it must be replaced Problem Alarm HP high pr essure switch Cause Troubleshooting Remedy 1 Air in the heating syst
6. Using the buzzer check that there are no cable breaks In order to do this disconnect the cables from the pressure switch and circuit board If a cable has come loose reconnect it If there is a cable break replace the cable 7 The high pressure switch does not open Incorrect pressure switch installed Same or higher break pressure than the high pressure switch See marking Pressure switch fault opens at a higher pressure than indicated mark pressure Check using the manome ter apparatus Defective pressure switch never opens If the high pressure switch does not open replace it VIIFM102 Thermia Varmepumpar Service Instructions Atec Thermia Cause Troubleshooting Remedy 8 The high pressure switch opens too soon Incorrect pressure switch installed As low or lower break pressure than operating pressure switch See marking Pressure switch fault opens at a lower pressure than indicated mark pressure Check using the manome ter apparatus Defective pressure switch always open Ifthe high pressure switch opens too soon or is always open replace it 9 External system shunt that closes on time setting Check for shunts or valves in the system which are timer controlled that close down the entire or too large a part of the heating system Always ensure that there is a sufficiently large water volume for the heat pump to work against i e
7. What output is required to keep the room warm Ensure that available power is at least as great as the building s power demand If the heating system is dimensioned for greater supply temperatures than the heat pump can provide it must be adjusted by increasing the heat emitting surface for ex ample If the room requires a higher output than the heating system can provide extend the heating system 13 Changed conditions Have you increased your heating and or hot water demand Ifthe heat pump has been dimensioned for a certain demand and this demand is increased the heat pump might not be able to maintain the desired room tem perature If hot water consumption increases a larger propor tion of time is used to produce hot water which means less time for heat production only applies to system solution 1 If the heat pump cannot cope with the de mand replace it with one with a higher output or supplement it with a higher out put auxiliary heater Thermia Varmepumpar VIIFM102 Service Instructions Problem Too hot Atec nm N Cause Troubleshooting Remedy 1 The heat pump s control computer is not set adjus ted to the customer s re guirements wishes Check the ROOM and CURVE and MIN settings Adjust incorrect values in the heat pump s control computer ROOM Desired indoor temperature CURVE Should be set so that the desired indoor temperature ROOM is
8. out by an authorized electrician and must follow applicable local A and national regulations Caution The electrical installation must be carried out using permanently routed cables It must be possible to isolate 4 the power supply using an all pole circuit breaker with a minimum contact gap of 3 mm The maximum load for externally connected units is 2A 2 4 Water guality Caution A normal heating system always contains a certain amount of corrosion particulates rust and sludge prod A ucts from calcium oxide This comes from acid that is naturally occurring in the fresh water that the system is filled with It is not good practice to have to fill the heating system regularly which is why any leakage in the heating system should be repaired immediately Normal filling should occur only once or twice a year The water in the heating system should be as clean as possible always position the dirt filter on the return line from the heating system to the heat pump as close to the heat pump as possible Caution Hard water Normally it is not a problem installing a heat pump in areas with hard water because the normal 4 operating temperature for the hot water does not exceed 60 C In areas where there are exceptional prevail ing conditions with the water one can install a softening filter which softens the water cleans any impurities and prevents the build up of calcification E VIIFM102 Thermia V rmepumpar N Service Instructions Atec 2 5 Com
9. pressure switch If the delivery line sensor is defective replace it If the delivery line temperature gets so hot that the compressor stops start by leak tracing the unit Rectify the leak if a leak is found If no leak is found try draining and refilling the unit and then restarting the heat pump and seeing what the delivery line temperature is If the problem persists replace the compressor 9 Expansion valve defective or incorrectly set Using manometer apparatus and thermometer check what the overheating reading of the unit is If the expansion valve is defective replace it 10 Lack of refrigerant not enough refrigerant in the system Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant If there appears to be a leak in the refriger ant circuit carry out leak tracing and any necessary corrective action If leak tracer is not available brush soap water on the sus pected leak and look for bubbles Also check for oil as this can come out from the refrigerant circuit Thermia Varmepumpar VIIFM102 Service Instructions Atec ma N Cause Troubleshooting Remedy 11 Overfilled refrigerant cir cuit 12 Changed conditions Have you increased your heating and or hot water demand Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant Ifth
10. rotates using a screw driver Then read the temperature on both connection pipes to the condenser If the temperature difference is lt 3 C the condenser is probably blocked If the temperature difference is 3 13 C it is probably not blocked If the temperature difference is gt 13 C the condenser is probably blocked If the condenser is thought to be blocked try flushing it If this does not work it must be replaced 13 Blocked condenser on the refrigerant side Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant If the condenser is thought to be blocked by oil for example try blowing nitrogen through it to release the oil If this does not work it must be replaced 14 Overfilled refrigerant cir cuit Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant Follow the correct procedure depending on type of refrigerant to add the correct amount of refrigerant If there appears to be a leak in the refriger ant circuit carry out leak tracing and any necessary corrective action Thermia Varmepumpar VIIFM102 Service Instructions Atec Problem Alarm motor protection Thermia Cause Troubleshooting Remedy 1 Phase drop or blown fuse Check the fuses in the fuse box Check that all phases are present on the terminal block for
11. the condenser as it should In such a case hysteresis starts and stops the heat pump often phenomena Adjust ROOM and CURVE if necessary En sure that there is sufficient flow over the condenser and the heating circuit Problem Connection of ext ernal AH Cause Troubleshooting Remedy Incorrectly connected auxili ary heater Does not start when the control computer Check the connection against the instructions wiring dia gram Test the function in manual mode gives the signal If the auxiliary heater is incorrectly connec ted reconnect according to the instruc tions VIIFM102 Thermia Varmepumpar Service Instructions 3 5 7 Heat pump Problem Noise loud noise Atec nm K Cause Troubleshooting Remedy 1 Positioning the heat pump Determine whether the heat pump can be moved to a more suitable location Move the heat pump if possible 2 Connection wall lead ins Check that the unit is installed according to the instruc tions Rigid mountings can generate noise from the heat pump via walls in the house Problem Defrosting problems Cause Troubleshooting Remedy Location calibration of the outdoor sensor Defrost sensor calibration Check that the outdoor sensor is installed according to the installation instructions and that it is correctly calibrated Check that the defrost sensor is installed acc
12. the radiators Try lubricating lead ins in walls ceilings and floors with silicone spray Thermia Varmepumpar VIIFM102 Service Instructions Atec Problem Loud compressor noise Thermia Cause Troubleshooting Remedy 1 Phase drop The compressor attempts to start or operates on two phases only applies to 3 phase heat pumps 1 Check that there is 400 V between incoming phases on the heat pump 2 If there is supply to the heat pump measure the volt age for all electrical components all the way to the compressor see wiring diagram Check where the phase drop is and rectify 2 Touching pipes vibra tions Establish which pipe s is are causing the problem Try to remove the contact 3 Compressor fault Determine whether the compressor is unusually loud Check with a voltmeter at a point before and after the soft starter The measurement values should not dif fer If the compressor is defective replace it Problem Shrieking whistling noise Cause Troubleshooting Remedy 1 Noise from the soft start er Measurement check the input and output phases for the soft starter as well as the control signals from the heat pump card see wiring diagram If the soft starter is defective replace it 2 The compressor s safety valve opens The compressor has an integrated safety valve that opens when the pressure difference betwee
13. Check what the relevant sensor shows Is it a plausible actual value Measure the resistance of the sensor check against the ohm table in Measurement points If the sensor is defective replace it 4 The 3 way valve has jam med in hot water mode 1 Check the function of the 3 way valve motor by test running it manually If the motor does not shift mode during manual test operation check that there is volt age to the motor see wiring diagram 2 Detach the motor and test closing and opening the valve by turning the shaft by hand Is the motor being supplied with voltage according to the wiring diagram in both operating instances MANUAL TEST REV V HOT WATER 0 Radiator mode1 Hot water modelf there is voltage to the motor but it does not shift mode replace it 5 Defective electric heating element Use a buzzer and check if all coils in the electric heating el ement are intact If the electric heating element is defective replace it 6 The heat pump has stop ped on HIGH RETURN Check what the MAX RETURN value is set at in the heat pump s control computer It must be adjusted to the unit s maximum supply temperature and the sys tem s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is transmitted Check what the return line sensor shows Is it a plausi ble actual value If not take a resistance reading from the sensors and chec
14. SSURE ERROR High pressure switch has deployed LOW HEAT CIR FLOW The flow sensor has registered too low a flow MAX TEMP ELEC HW Too high temperature in heat pump junction box electrical cabinet NO OF TRIES X 5 where X 1 5 Circulation pump is jammed Start attempt made HEATING CIRC PUMP Circulation pump is jammed HEATING SYSTEM PUMP Circulation pump is jammed OUTDOOR SENSOR Sensor fault alternatively cable fault DEFROST SENSOR Sensor fault alternatively cable fault Defrost sensor SUPPLY LINE SENSOR Sensor fault alternatively cable fault Supply line sensor SYSTEM SUPPLY LINE SENSOR Sensor fault alternatively cable fault System supply line sensor RETURN LINE SENSOR Sensor fault alternatively cable fault Return line sensor HIGH RETURN LINE TEMP Return line temperature too high BUFFER TANK SENSOR Sensor fault alternatively cable fault HGW SENSOR Sensor fault alternatively cable fault HOT WATER SENSOR Sensor fault alternatively cable fault the lower sensor Start sensor HOT WATER TOP Sensor fault alternatively cable fault FAILSAFE MODE Sensor fault alternatively cable fault on one of the refrigerant sensors The heat pump goes to fail safe mode and defrosts on time REFR 1 SENSOR Sensor fault alternatively cable fault Refrigerant sensor 1 REFR 2 SENSOR Sensor fault alternatively cable fault Refrigerant sensor 2 LOW RETURN TEMP 1 The return line temperature is too low to start a defrosting LOW RETURN TEMP 2 Th
15. Service Instructions Atec Thermia www thermia com Thermia Varmepumpar is not liable or bound by warranty if these instructions are not adhered to during installation or service The English language is used for the original instructions Other languages are a translation of the original instructions Directive 2006 42 EC Copyright Thermia Varmepumpar gt N Service Instructions Atec Table of Contents 1 About documents and decals cece k ee ee eee ee eee eee eee ee KKKA 4 TA INGPOMUCHION eii ek a nace a ae aa we Ha ee RI ee Oe Rae ae Bogue Te S jaa 4 1 2 Symbols in docuMents lt osc mika cle eae tee Pee a a a E EA 4 13 Symbols on decals eiii ei GEE Kea wae Hh oon Gat Rae datana 4 2 Important information Safety regulation oooooooococnonnonoronannono nono 6 2 1 General safety precautions sa sas s maa a ska EEE DERE eee Ree ENT NK ee nan 6 22 R frigerant casadas a ie j ah Beatles Kd ta s ELIA ca ee s i det a a oa 7 2 3 Electrical CONNECTION s ss ewe evo a OE OG OE HOR SG REE a SES oS a T BS 8 24 Water quialllY cosmo bend a a e beh ee EE a oe 8 25 COMMISSIONING s 45 00 ae e dd ERA Ee ee RRA oie lad awe eS ae 9 3 Troubleshooting sses sneren oaeiae e Boe A a a wae 10 31 Alarmi sais artis pee dee ae inde Sw bd wa ad Ree Ea eee Aaa ee Bad ee eRe A aa di Ga la 10 3 2 COMPONENTES 3 aava s Ga Paes hale bk Mase aw Ge EE Se Ha we A Rone be a Mee ie Ae 11 3 3 Measurement points cesses 3 a
16. a The square symbol appears when the deliv ery pipe temperature is as high or greater than the maximum temperature of the dis charge pipe 140 C 4 Lack of refrigerant not enough refrigerant in the system Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant Follow the correct procedure depending on type of refrigerant to add the correct amount of refrigerant If there appears to be a leak in the refriger ant circuit carry out leak tracing and any necessary corrective action If leak tracer is not available brush soap water on the sus pected leak and look for bubbles Also check for oil as this can come out from the refrigerant circuit 3 5 2 Leakage Problem Leak fluid side Cause Troubleshooting Remedy 1 Insufficiently tightened connections Locate the leak Tighten the connection and check that it is sealed Ifitis still not sealed replace the entire connection and support sleeve only at soft pipes 2 Defective gasket or O ring Locate the leak Replace the gasket or O ring 3 Cracked nut or connec tion Locate the leak Replace nut or connection 4 There is no overflow pipe connected to the safety valve s Establish which safety valve does not have an overflow pipe Install an overflow pipe according to the applicable norms 5 Filler valve between in co
17. available for download here www thermia com documents 1 2 Symbols in documents The instructions contain different warning symbols which together with text indicate to the user that there are risks involved with ac tions to be taken The symbols are displayed to the left of the text and three different symbols are used to indicate the degree of danger Danger Indicates an immediate danger that leads to fatal or serious injury if necessary measures are not taken Warning Risk of personal injury Indicates a possible danger that can lead to fatal or serious injury if necessary measures are not taken Caution Risk of installation damage 4 Indicates a possible hazard that can lead to item damage if necessary measures are not taken A fourth symbol is used to give practical information or tips on how to perform a procedure A Information regarding making the handling of the installation easier or a possible operational technical disad vantage 1 3 Symbols on decals The following symbols can occur on decals on the different parts of the heat pump Which symbols are used depends on the heat pump model VIIFM102 Thermia V rmepumpar Service Instructions Atec 1 3 1 General N Warning danger A Read the documentation provided l Read the documentation provided mm K n Warning hot surfaces A Warning moving parts ja Warning risk of crushing injury A Warning hazardous electrical voltage 1 3 2 Electrica
18. d If the text HEAT PRESSURE ERROR is displayed it can mean that the phases are in the incorrect order When the compressor is running check the pressure pipe temperature by feeling the pressure pipe If the phases are correctly sequenced it should be hot not just warm even a distance from the compressor When the compressor runs with the phases incorrect ly sequenced a strange noise may be heard loud rat tling when the compressor runs backwards If the phases are in the incorrect order switch two incoming phases at the main terminal block and recheck according to the troubleshooting window VIIFM102 Thermia Varmepumpar Service Instructions Atec Problem Alarm electric heater error gt K Cause Troubleshooting Remedy 1 The overheating protec tion has tripped 2 Phase drop The alarm occurs when 230 Vis not registered between L2 on the circuit board and N Does not apply if MAX STEP P Check if the overheating protection has tripped Check if the overheating protection has tripped Check if any cables at the circuit board or overheating protection are loose or damaged If the overheating protection has tripped reset it If the overheating protection has tripped reset it If the cables are loose or damaged secure or replace them 3 Overheating protection fault cannot be reset Press the reset button measurement check for 230 V on the inc
19. ductions this explains why the unit consumes more current than calcu lated but this does not mean for sure that it should be increased there might be a reason why the interval has been changed 6 The heat pump has stop ped on HIGH RETURN Check what the MAX RETURN value is set at in the heat pump s control computer It must be adjusted to the unit s maximum supply temperature and the sys tem s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is transmitted Check what the return line sensor shows Is it a plausi ble actual value If not take a resistance reading from the sensors and check against the ohm table in Meas urement points If the MAX RETURN value is not adjusted for the system according to the troubleshoot ing window adjust it If the sensor is defec tive replace it 7 The compressor runs backwards The incoming phases have the incorrect sequence only applies to 3 phase heat pumps If the compressor runs backwards it will not cope with com pressing the refrigerant and therefore does not produce the correct power which leads to the control comput er requesting auxiliary heat ing If the text ERR PHASE SEQ appears in the display when the heat pump is powered only appears in the first 10 minutes this means that the phases have the incorrect sequence When the compressor is running check the pressure pipe te
20. e creates a poisonous irritating gas This gas can A be detected by its odour even at concentrations below its permitted levels Evacuate the area until it has been sufficiently ventilated Thermia V rmepumpar VIIFM102 Thermia Service Instructions Atec Caution When repairing the refrigerant circuit the refrigerant must not be released from the heat pump it must trea A ted in the appropriate way Draining and refilling must only be carried out using new refrigerant for the amount and type of refrigerant see manufacturer s plate through the service valves Caution All warranties from Thermia are void if when filling with refrigerant other than Thermia V rme AB specified A refrigerant if there has not been written notification that the new refrigerant is an approved replacement re frigerant together with other remedies Caution When the heat pump is to be scrapped the refrigerant must be extracted for disposal Local rules and regula Y tions related to the disposal of refrigerant must be followed 2 3 Electrical connection Warning Hazardous electrical voltage The terminal blocks are live and can be highly dangerous due to the risk of elec A tric shock All power supplies must be isolated before electrical installation is started The heat pump is con nected internally at the factory for this reason electrical installation consists mainly of the connection of the power supply Caution Electrical installation may only be carried
21. e heat pump has been dimensioned for a certain demand and this demand is increased the heat pump might not be able to maintain the desired room tem perature If hot water consumption increases a larger propor tion of time is used to produce hot water which means less time for heat production Follow the correct procedure depending on type of refrigerant to add the correct amount of refrigerant If the heat pump cannot cope with the de mand replace it with one with a higher output or supplement it with a higher out put auxiliary heater Problem Auxiliary heater cuts in too soon Cause 1 The heat pump s control computer is not set adjus ted to the customer s re quirements wishes Troubleshooting Check the ROOM CURVE INTEGRAL A1 and INTEGRAL A2 settings Remedy Adjust incorrect values in the heat pump s control computer ROOM Desired indoor temperature CURVE Should be set so that the desired indoor temperature ROOM is maintained regardless of the outdoor tem perature INTEGRAL A1 Start value for the compressor INTEGRAL A2 Start value calculated from A1 for the auxiliary heater 2 Changed conditions Have you increased your heating and or hot water demand Ifthe heat pump has been dimensioned for a certain demand and this demand is increased the heat pump might not be able to maintain the desired room tem perature If hot water consumption increases a larger propor ti
22. e heater Replace with a larger heater or supplement with an extra heater E g supplement with an MBH MBH or an electric heater 8 The operating pressure switch opens too soon at too low a pressure Hot water production ends when the operating pres sure switch opens Check the break pressure using manometer apparatus If the pressure switch opens at the incorrect pressure replace it The replacement pressure switch can be in stalled on the service output Schrader valve 9 Insufficient exchange sur face to transfer the heat pump s output to the heat er Only applies to heat pumps with a separate heat er Is the exchange surface too small Can the heater cope with the heat pump s output Replace with a heater with a larger ex change surface 10 Heat loss in the hot wa ter pipe Open the hot water tap read off the temperature on the outgoing hot water pipe from the heat pump and the tem perature of the hot water The temperature difference measured between the heat pump and hot water indicates the temperature loss Examples of temperature loss causes Long water pipes Uninsulated hot water pipes Hot water pipes routed through cold areas Other causes that can affect the hot water temperature Isa mixer valve installed in the system Temperature set too low on the mixer valve Leaking mixer valve Watertap fault Leaking thermostat mixer a VVC loss If any
23. e phases incorrect ly sequenced a strange noise may be heard loud rat tling when the compressor runs backwards If the phases are in the incorrect order switch two incoming phases at the main terminal block and recheck according to the troubleshooting window 7 Changed conditions Have you increased your heating and or hot water demand Ifthe heat pump has been dimensioned for a certain demand and this demand is increased the heat pump might not be able to maintain the desired room tem perature If hot water consumption increases a larger propor tion of time is used to produce hot water which means less time for heat production If the heat pump cannot cope with the de mand replace it with one with a higher output or supplement it with a higher out put auxiliary heater Problem The auxiliary heater is in operation but not the compressor Cause Troubleshooting Remedy 1 Operating mode AUX HEATER is selected If this operating mode is selected the auxiliary heater is used for heating and hot water production not the com pressor If AUX HEATER mode is selected and you no longer want it change to AUTO the heat pump then controls both the com pressor and auxiliary heater 2 Peak heat operation anti legionella function is run ning Check if the heat pump runs peak heat Peak heat operation occurs in connection with hot water production with the set in ter
24. e return line has fallen too low during defrosting LOW EVAP TEMP 1 Evaporation temperature too low LOW EVAP TEMP 2 Too great a deviation in evaporation temperature average value SUCTION TEMP SENSOR Sensor fault alternatively cable fault ROOM SENSOR Sensor fault alternatively cable fault DISCHARGE PIPE SENSOR Sensor fault alternatively cable fault DISTR CIR 1 SENSOR Sensor fault alternatively cable fault DISTR CIR 2 SENSOR Sensor fault alternatively cable fault POOL SENSOR Sensor fault alternatively cable fault COM ERROR HP CARD Communication broken between display card and heat pump card outdoor COM ERROR HUB CARD Communication broken between display card and hub card indoor HE VIIFM102 Thermia V rmepumpar Thermia N Service Instructions Atec Message Meaning COM ERROR EXV CARD Communication broken between display card and expansion valve control card outdoor COM ERROR EXPANSION CARD Communication broken between display card and expansion card indoor A In event of alarm the heat pump will if possible supply heating to the house primarily with the compressor secondarily with the auxiliary heater Hot water will stop to indicate that something noteworthy has occurred 3 2 Components Fig 1 Components Position Name Position Name 1 Electrical cabinet 11 Electronic expansion valve 2 Fan 12 Receiver 3 Pressure transmitter 13 Drying filte
25. em Listen for air in the heat pump and heating system Bleed the heating system according to the installation instructions 2 Blocked strainer in the heating system Check that the strainer is not blocked Clean the strainer if necessary 3 Closed or partially closed thermostats valves in the heating system Check that the thermostats valves in the heating system are open Open closed thermostats valves 4 The circulation pump that is defective or has jammed 5 Shut off main tap in heat ing system Is there voltage and 0 10V signal applies to A classed cir culation pumps up to the circulation pump Check that the main tap is open Check that the circulation pump is active in the control system s manual test menu Check if there is voltage to the circulation pump if there is and it does not run the circulation pump is jammed If this is the case open the bleed screw and try to re lease the paddle wheel using a screwdriver for example Does not apply to heat pumps in not valid If there is no voltage to the circulation pump check if there is voltage from the I O card see wiring diagram If there is voltage from the I O card check the components between the I O card and the circulation pump If a component is defective replace it Open closed main tap 6 Cable break or loose cable to high pressure switch Checkthatboth cables are connected to the pressure switch
26. for the heat to give off its heat to 10 Incorrectly facing non return valve with too high opening pressure Check the system s direction of flow and that the non return valve is turned the correct way Check that the heat pump s external available pres sure exceeds the non return valve s opening pressure If the non return valve is facing the wrong way turn it Ifthe non return valve has too great an opening pressure replace it 11 Large pressure drop in the heating system Dirtin the heating system Closed or partially closed thermostats valves in the heating system Under dimensioned pipe system Check that the HP s external available pressure exceeds the system pres sure drop If necessary clean flush the heating system Open closed thermostats valves If there is not sufficient pressure equip ment the heating system can be adjusted according to the system solution for large pressure drop 12 Blocked condenser on the water side If there is no strainer in the heating system there is a risk of dirt sticking in the condenser and blocking it Unfortu nately there is no easy way of checking ifthe condenser is blocked You can carry out a test by allowing the compressor and circulation pumps to remain in operation and after a while check that the pressure pipe becomes hot and that the cir culation pumps work for circ pumps with a bleed screw unscrew it and feel ifthe pump rotor
27. he instruc tions Install flexible hoses according to the in structions 2 Incorrectly installed flexi ble hoses Flexible hoses must be installed according to the instruc tions Install flexible hoses according to the in structions 3 Installing suspending pipes Check if vibrations are transmitted via one of the pipe mountings in the installation Remove or move the mounting point or in stall vibration isolating mounting parts 4 Circulation noise whis tling noise in the heating system Check the heating system Closed valves choke valves adjuster valves or other restrictions in the radiator system can cause circula tion noise Is the heating system correctly adjusted for flow Too great a flow in the heating system can cause cir culation noise If the incorrect type of valve is used to choke the flow replace with the correct type If the heating system is not correctly adjus ted make adjustments Can the heating system be run at a lower flow 5 Clicking Check that the volume tank is installed and has the correct dimensions for the relevant system See the installation instructions Establish when clicking occurs during heating and or in connection with completed hot water production Locate the clicking noises A surge tank can be installed on the supply line to mix the hot water with the existing slightly cooler water before it goes out to
28. incoming supply Also check that all wiring is secure if screw terminals are used they must be properly tightened if phoenix flat spring ter minals are used the cables must be secure in the correct hole with load on the cable If any of the phases are missing check backwards towards the building s main electrical cabinet If there are no phases there contact the network supplier 2 Cable break Check the supply to the motor protection soft starter or compressor If a cable is damaged replace it 3 Defective soft starter three phase heat pump Measurement check and establish that when the Heat pump card gives a signal there must be voltage between A1 amp A2 on the soft starter the soft starter releases all three phases down to the compressor If the soft starter does not release the pha ses when it receives signals from the heat pump card replace it 4 Defective soft starter sin gle phase heat pump 5 Defective or incorrectly set motor protection Check measure and establish that when the Heat pump card gives a signal there must be voltage between ON and N on the soft starter the soft starter releases the pha ses to the compressor Use a hook on meter to establish when the motor protec tion deploys check what the motor protection is set to Compare with the table For three phase heat pumps all three phases must be supplied Ifthe soft starter does not release the pha ses when i
29. ircuit Problem Runs on electric heating element Cause 1 Operating mode AUX HEATER is selected Troubleshooting If this operating mode is selected the auxiliary heater is used for heating and hot water production not the com pressor Remedy If AUX HEATER mode is selected and you no longer want it change to AUTO the heat pump then controls both the com pressor and auxiliary heater 2 The compressor cannot run due to an alarm Check the alarm that is indicated in the display Rectify the problem and rest the alarm See Alarm 3 The integral value has reached the start level for the auxiliary heater 4 Peak heat operation anti legionella function is run ning Check what the integral value is in the control system Check if the heat pump runs peak heat If the auxiliary heater is in operation be cause the integral value has counted down to the start value the computer reacts as it should see the Installation instructions for further information Peak heat operation occurs in connection with hot water production with the set in terval The compressor should then start to produce hot water and 2 minutes later the auxiliary heater starts The compressor must then stop and the stop temperature be reached with only the auxiliary heater connected Take no corrective action 5 The heat pump has stop ped on HIGH RETURN Check what the MAX RETURN value is set at in
30. k against the ohm table in Meas urement points If the MAX RETURN value is not adjusted for the system according to the troubleshoot ing window adjust it If the sensor is defective replace it 7 Heat production is stop ped by the HYSTERESIS function If the flow temperature rises as soon as heat production is stopped by HYSTERESIS before INTEGRAL reaches 0 there may be heating deficit in the house Check if heat production stops because the hysteresis value is set too low See the installation instructions for factory setting Check if heat production stops because thermostats valves in the heating system are closed or partially closed a Check if heat production stops because the heating system is under dimensioned Try increasing the hysteresis value un til the heat pump stops on INTEGRAL instead Open thermostats valves in the heat ing system and check that the heat pump stops on INTEGRAL Ifthe heating system is deemed to be under dimensioned the system must be extended the heat emitting sur face increased VIIFM102 Thermia Varmepumpar Service Instructions Atec gt K Cause Troubleshooting Remedy 8 The auxiliary heater is not permitted to cut in with suf ficient output Value set too low on MAX STEP MAXSTEP 1 3 kW MAXSTEP 2 6 kW MAXSTEP 3 9 kW MAXSTEP 4 12 kW MAXSTEP 5 15 kW 9 The external auxiliary heater does no
31. l components Outdoor unit 406 Room sensor Outdoor sensor or DANA Hot water sensor 62 of 55 y Hot water top sensor lt i a Defrost sensor CAL b Flow guard Drip tray i 362 y Shunt valve xplanation l l l AA Component ordinary delivery according to proposed sys 304 Circulation pump tem solutions 1363 y Exchange valve hot water y Component accessorie according to proposed system sol TE 7777 utions ESA 365 y Supply line sensor 366 Return line sensor on 1 3 3 Pipe connections gt Tap water Heating system IN goy Brine system Defrosting tank Expansion tank with safety valve brine Air bleeding Temperature and pressure relief valve Outdoor unit Water heater gt wo E nO Thermia V rmepumpar VIIFM102 Thermia N Service Instructions Atec 2 Important information Safety regulation 2 1 General safety precautions Warning Risk of personal injury Children are not permitted to play with the product gt n w o 5 The heat pump must be installed by authorised installation engineers and the installation must follow the applicable local rules and regulations as well as these installation instructions gt n w a o 5 This product is not intended for persons including children with reduced physical sensory or psychological capacity or who do not have knowledge or experience unless supervised or they have received instructions
32. l operation the heat pump operates with superheating of 5 5 C 7 C the expansion valve s degree of opening will vary depending on operating situation At outdoor temperatures of 5 C or lower the opening degree is below 20 At outdoor temperatures of 5C to 13 C the opening degree is around 40 50 When cooling A35W18 the degree of opening is 100 Caution If superheating is gt 9 C and the degree of opening of the expansion valve lies steady at 100 this can indicate A that a significant part of the refrigerant has leaked from the heat pump If this is the case the heat pump must be checked by service technicians with personal refrigeration certificates 3 5 Operational problems The tables list the most probable and common causes of the problem first When troubleshooting the cause of a problem start with the first cause and go down the list There may be more than one way of troubleshooting a cause where the most probable is given first Problem Alarm LP lower pressure transmitter Cause Troubleshooting Remedy 1 Cable break or loose cable Check that both cables are connected to the lower If a cable has come loose reconnect it to lower pressure transmit pressure transmitter If there is a cable break replace the cable ter Using the buzzer check that there are no cable breaks In order to do this disconnect the cables from the lower pressure transmitter and circuit board 2 The pressure transmitter
33. maintained regardless of the outdoor temperature MIN Lowest set point value on the supply line regardless of the outdoor temperature 2 Sensor fault OUTDOOR ROOM SUPPLY LINE Check what the relevant sensor shows Is it a plausible actual value Measure the resistance of the sensor check against the ohm table in Measurement points If the sensor is defective replace it 3 Defective 3 way valve mo tor The motor should set the valve to the relevant posi tion depending on operat ing conditions If it does not hot water from the water heater will mix with the radi ator water Check the function of the 3 way valve motor by test run ning it manually If the motor does not shift mode during manual test operation check that there is voltage to the motor see wiring diagram Is the motor being supplied with voltage according to the wiring diagram in both operating instances MANUAL TEST REV V HOT WATER 0 Radiator mode 1 Hot water mode If there is voltage to the motor but it does not shift mode replace it 4 Jammed reversing valve If the valve is not sealed hot water from the water heater will mix with the radiator water Detach the motor and test closing and opening the valve by turning the shaft by hand If it is sluggish or jams replace with a new one VIIFM102 Thermia Varmepumpar mm N Service Instructions Atec Problem Irregular indoor temperature
34. mela ee a e ee ea EO HUE HR ae eee ea Hee See SORIA SS 12 3 47 CHECKPOINTS tae Gig shin A alaa a a AA ee Taa Ae Gham Akane 14 3 5 Operational problems lt a aa sa odes ba ee ERS SG ae ee a ala 15 Thermia Varmepumpar VIIFM102 nm N Service Instructions Atec 1 About documents and decals 1 1 Introduction The following documents are available for this product Installation quick guide containing information to install a heat pump Supplied with the heat pump on delivery The Service instructions contain information about the heat pump s function accessories fault tracing and technical data The in structions also contain tips and advice that should be followed before a heat pump installation It is therefore recommended that the instructions are read before installation The Service instructions are available for download as below The Wiring diagrams that contain the wiring diagram for the heat pump intended for fault tracing and service The Wiring diagrams are available for download as below The User manual must handed over and gone through with the end customer Supplied with the heat pump on delivery Country specific instructions and forms are available where relevant Supplied with the heat pump on delivery Self adhesive decals with translation text Must be placed on the manufacturing plate in conjunction with installation Supplied with the heat pump on delivery The Service instructions and Wiring diagrams are
35. ming cold water and heating system not closed or leaking Check whether water continuously leaks from the safety valve on the expansion vessel on the hot side Try closing the filler valve and see if water stops dripping from the safety valve If not replace the filler valve VIIFM102 Thermia Varmepumpar Service Instructions Atec nm N Cause Troubleshooting Remedy 6 Leak at soldered joints Locate the leak Drain the system of fluid repair the leak If the leak is on the connection pipe to the heat exchanger also drain the refrigerant side 7 Associated leakage in the condenser Checkfor lack of refrigerant in the unit Check by smelling at the safety valve on the hot side open the valve and check If the condenser has a leak replace it 8 Leak at soldered joint on water heater only applies to Atec Total Atec Total Locate the leak If there is a leak at the soldered joint re place the water heater 9 Associated leakage on plate heat exchanger only applies to Atec Total Atec Total Check for lack of refrigerant in the unit Check by smelling at the safety valve on the hot side open the valve and check If there is leakage replace plate heat ex changer Problem Noise problem in the radiator system Cause Troubleshooting Remedy 1 Flexible hoses missing Flexible hoses must be installed according to t
36. missioning Caution The installation may only be commissioned if the heating system and brine system have been filled and bled A Otherwise the circulation pumps can be damaged Caution If the installation is only to be driven by the immersion heater during the installation ensure that the heating A system is filled and the brine pump and compressor cannot be started This is carried out by setting the oper ating mode to AUX HEATER Thermia Varmepumpar VIIFM102 9 nm N Service Instructions Atec 3 Troubleshooting 3 1 Alarm In event of alarm this is indicated in the display with the text ALARM and an alarm message see following table For alarms that are not reset automatically acknowledgement is reguired Acknowledge the alarm by setting the heat pump to operating mode OFF and then back to the desired operating mode Message Meaning MOTOR P COMP ERROR The compressor motor protection has deployed MOTOR P FAN ERROR The fan motor protection has deployed EL HEATER ERROR The electrical heater overheating protection has deployed HEAT PRESSURE ERROR The expected pressure and temperature change in the refrigerant circuit has not happened in the correct way at compressor start LOW PRESSURE ERROR Evaporation pressure has fallen too low LOW PRESSURE TRANSDUCER Fault in low pressure transmitter alternatively cable fault HIGH PRE
37. mperature by feeling the pressure pipe If the phases are correctly sequenced it should be hot not just warm even a distance from the compressor When the compressor runs with the phases incorrect ly sequenced a strange noise may be heard loud rat tling when the compressor runs backwards If the phases are in the incorrect order switch two incoming phases at the main terminal block and recheck according to the troubleshooting window 8 The compressor has been stopped by the operating pressure switch or delivery line sensor Check if a square appears in the display s lower left corner If so the operating pressure switch is open or the delivery pipe sensor triggers an alarm for too high temperature The operating pressure switch is most easily checked by using a buzzer to see if it is connected The delivery line sensor value is read off from the con trol computer in the HEAT PUMP menu Is it a plausi ble actual value If not take a resistance reading from the sensor and check against the ohm table in the in stallation instructions The compressor has been stopped by the delivery line sensor and you have established that it shows the correct temperature This may have been caused by a leak in the refrigerant circuit Ifthe operating pressure switch has stuck in the open position try gently tapping on the pressure switch head If this does not help or it sticks in the open position re peatedly replace the
38. n high and low pres sure sides is too large A whistling sound can be heard dur ing pressure equalisation Use a manometer to check at which pressure differential pressure equalisation occurs Replace the compressor if the valve opens at too low pressure or when the compres sor is stationary Problem Noise miscellaneous Cause Troubleshooting Remedy 1 Vibrating protective sleeves on the pressure switches Establish where the vibration noise is coming from Prevent the protection sleeve vibrating by using insulation tape for example 2 Vibration noise from the electrical installation Check for electrical steps or similar devices screwed to the heat pump and wall These can cause vibrations and noise Problem Temperature and or quantity Carry out according to the installation in structions Cause Troubleshooting Remedy 1 Defective 3 way valve mo tor 2 Jammed reversing valve The valve is not secure and releases hot water to the ra diators during hot water production Check the function of the reversing valve by test running it manually Detach the motor and test closing and opening the valve by turning the shaft by hand If the motor is defective replace it If it jams replace with a new one 3 Air in TWS coil or water outer jacket During hot water production Listen for air Check the temperature difference between supply and re
39. oming and outgoing connections If the overheating protection is defective replace it 4 Flow sensor fault Check what the flow sensor shows Is it a plausible actual value Measure the resistance of the sensor check against the ohm table in Measurement points If the sensor is defective replace it 5 No or insufficient circula tion in the heating system Check That the circulation pump spins That the shut off valves are open That the strainer is not blocked That there is no air in the heating system The circulation pump may have jammed If so open the bleed screw and try to release the paddle wheel using a screwdriver for example Open closed valves or taps Check and if necessary clean the strainer If necessary bleed the heating system ac cording to the installation instructions Problem Alarm circulation pump Cause Troubleshooting Remedy The circulation pump s inte grated alarm has deployed Only applies to not valid Airin the heating system a Has the circulation pump jammed Vent the heating system and TWS coil If the circulation pump has jammed there is an integrated shake function that at tempts to shake itself loose up to a maxi mum of 5 times if it does not succeed an alarm will occur Try cutting the voltage to the heat pump to stop the alarm and then manually run the circulation pump lf the alarm recurs repeat the proced
40. on how the apparatus functions from a safety qualified person gt n w c o 5 The heat pump must be located in a frost free environment gt n uy a o 5 The heat pump must be placed in an area with a floor drain gt n w a o 5 The heat pump must be located on a stable base The floor must be able to support the gross weight of the heat pump with filled hot water tank see Technical data gt A w c e o 5 To prevent leaks ensure that there are no stresses in the connecting pipes gt n w c a o 5 It is important that the heating system is bled after installation gt A w c a o 5 Bleed valves must be installed where necessary gt n w o 5 The hot water tank must be equipped with an approved safety valve gt Caution Heating systems with closed expansion tanks must also be supplied with approved pressure gauges and safe ty valves gt al VIIFM102 Thermia V rmepumpar Thermia Service Instructions Atec Caution Cold and hot water pipes and overflow pipes from safety valves must be made of heat resistant and corro 4 sion resistant material for example copper The safety valve overflow pipes must have an open connection to the drain and visibly flow into this in a frost free environment Caution The connecting pipe between the expansion tank and the safety valve must slope continuously upwards A A continuous upwards slope means that the
41. on of time is used to produce hot water which means less time for heat production If the heat pump cannot cope with the de mand replace it with one with a higher output or supplement it with a higher out put auxiliary heater 3 Lack of refrigerant not enough refrigerant in the system Using manometer apparatus and thermometer check that the unit s overheating is correct for the specific refrigerant If there appears to be a leak in the refriger ant circuit carry out leak tracing and any necessary corrective action If leak tracer is not available brush soap water on the sus pected leak and look for bubbles Also check for oil as this can come out from the refrigerant circuit Problem Short operating ti mes despite heating demand Cause Troubleshooting Remedy ROOM and or CURVE set too high in combination with a heating system with poor circulation due to closed ra diator valves too small ele ments or insufficient water volume A tight fitting sys tem with poor pipe dimen sions may produce the same Check if the heat pumps starts if the supply temperature rises quickly whilst nothing happens to the return temper ature If this happens and the heat pump is stopped by the hysteresis function to later quickly drop in temperature supply in order to start again but cannot due to time conditions in regulation this means that the heat pump cannot transport the heat away from
42. or too high temperature The operating pressure switch is most easily checked by using a buzzer to see if it is connected The pressure pipe sensor value is read off from the control system in the HEAT PUMP menu Is it a plausi ble actual value If not take a resistance reading from the sensor and check against the ohm table in Meas urement points The compressor has been stopped by the delivery line sensor and you have established that it shows the correct temperature This may have been caused by a leak in the refrigerant circuit If the operating pressure switch has stuck in the open position try gently tapping on the pressure switch head If this does not help or it sticks in the open position re peatedly replace the pressure switch If the delivery line sensor is defective replace it If the delivery line temperature gets so hot that the compressor stops start by leak tracing the unit Rectify the leak if a leak is found If no leak is found try draining and refilling the unit and then restarting the heat pump and seeing what the delivery line temperature is If the problem persists replace the compressor 6 The compressor runs backwards The incoming phases have the incorrect sequence only applies to 3 phase heat pumps If the compressor runs backwards it will not cope with com pressing the refrigerant and therefore does not produce the correct power which leads to the control system requesting a
43. ording to the installation instructions and that it is correctly calibrated Install according to the instructions and cal ibrate if necessary Calibrate if necessary Problem Build up of ice under and around the outdoor unit Cause Troubleshooting Remedy Insufficient drainage Does a lot of ice accumulate under and around the out door unit because the melted water has nowhere to run Drain the ground under and around the outdoor section or install a drainpipe rout ed to an indoor drain or gully NOTE Install a heating cable in the drainpipe Problem Water run off by the outdoor unit risk of moisture problems in house foundations Cause Troubleshooting Remedy Insufficient drainage During some periods when the outdoor unit is being de frosted large amounts of water can run off Drain the ground under and around the outdoor unit so that it can cope with the extra amount of water produced because of defrosting or install a drainpipe routed to an indoor drain or gully NOTE Install a heating cable in the drainpipe Thermia V rmepumpar VIIFM102 Thermia N Service Instructions Atec VIIFM102 Thermia Varmepumpar Thermia N Service Instructions Atec Thermia Varmepumpar VIIFM102 Thermia N Service Instructions Atec Thermia Heat Pumps Box 950 671 29 ARVIKA Phone 46 570 81300 E mail info thermia com Internet www thermia com
44. pipe must not slope downwards from the horizontal at any point Caution When cooling it is important to limit the lowest flow line temperature to prevent condensation N If there is any risk of groundwater infiltration at wall lead ins for brine pipes watertight grommets must be used N In addition to applicable local rules and regulations the installation should be carried out in a manner that prevents vibrations from the heat pump being transmitted into the house causing noise Caution Work on the refrigerant circuit must only be carried out by a certified engineer AA gt Although the heat pump cooling system refrigerant circuit is filled with a chlorine free and environmentally approved refrigerant that will not affect the ozone layer work on this system may only be carried out by authorized persons In normal use and normal conditions the refrigerant has low toxicity However although the toxicity of the refrigerant is low it can cause injury or be highly dangerous in abnormal circumstances or where deliberately abused Warning Risk of personal injury Spaces in which heavy vapour can collect below the level of the air must be well venti A lated Refrigerant vapour is heavier than air and in enclosed spaces below the level of a door for example and in the event of leakage concen trations can arise with a resultant risk of suffocation due to a lack of oxygen Warning Risk of personal injury Refrigerant exposed to a naked flam
45. problems occur during troubleshoot ing as per the points carry out corrective actions To quickly check that the heat pump s hot water production works as it should drain the hot water so that the heat pump starts to produce the hot water When done read off the temperature on the top sensor and on the start sensor The top sensor should show a temperature of around 50 55 C and the start sensor around 45 48 C If af ter completed hot water production these temperatures are obtained this means that you have the correct temperature and vol ume of hot water in the water heater Thermia Varmepumpar VIIFM102 Service Instructions Atec mm N Problem Too cold Cause Troubleshooting Remedy 1 The heat pump s control computer is not set adjus ted to the customer s re guirements wishes Check the ROOM and CURVE and MAX settings Adjust incorrect values in the heat pump s control computer ROOM Desired indoor temperature CURVE Should be set so that the desired indoor temperature ROOM is maintained regardless of the outdoor temperature MAX Highest set point value on the sup ply line regardless of the outdoor tempera ture 2 Incorrect operating mode setin the heat pump s con trol computer Check which operating mode is set If the incorrect operating mode is set change to the desired operating mode 3 Sensor fault OUTDOOR ROOM SUPPLY LINE RETURN LINE
46. r 4 Suction line 14 Heat exchanger 5 Compressor 15 Flow sensor 6 High pressure switch 16 Heating system supply line Thermia Varmepumpar VIIFM102 Service Instructions Atec Thermia Y Position Name Position Name 7 Operating pressure switch 17 Return line heating system 8 Four way valve 18 Solenoid 9 Discharge pipe 19 Non return valve 10 Air heat exchanger Atec Standard Atec Total 1 Control module transparent in image 2 Immersion heater 3 Reversing valve 4 Circulation pump Atec Plus 5 Water heater 3 3 Measurement points Caution When reading the resistance of the sensors the sensor leads must first be disconnected from the control A equipment AE Outdoor Defrost sensor PT1000 sensor Other sensors 150 ohm Q 1000 ohm Q 22 kilo ohm k 30 1884 25 1443 VIIFM102 Thermia Varmepumpar Thermia N Service Instructions Atec HE Outdoor Defrost sensor PT1000 sensor Other sensors 150 ohm Q 1000 ohm Q 22 kilo ohm kQ 20 1115 15 868 10 681 5 538 0 428 5 343 10 276 15 224 20 183 25 150 30 124 35 103 40 86 45 50 55 60 65 70 75 80 85 3 3 1 Measurement checking sensors during fault tracing 1 Disconnect the relevant sensor from I O card terminal block 2 Measure the resistance for the sensor and any ex
47. t receives signals from the heat pump card and does not alarm as below replace it If the motor protection is defective replace it If incorrectly set adjust to the correct value 6 Defective compressor Measurement check the voltage on the phase s each to zero at the compressor There must not be any large devi ation between the phases If measurement checking the winding s resistance the same value must be on one to three windings If the compressor is defective replace it 7 Alarm from single phase soft starter Check the fault cause using the soft start LEDs Problem Alarm sensor all Cause Troubleshooting Remedy Sensor fault alternatively ca ble fault When reading the resistance of the sensors the sen sor leads must first be disconnected from the control equipment or terminal block First take a reading from the sensor including cable and check against the ohm table in Measurement points Ifthe read off value does not correspond with the ta ble only measure the sensor and check the ohm table in Measurement points If the sensor gives a correct value the cable is defective If the sensor does not give a correct value the sensor is defective Problem Error phase sequence Cause Troubleshooting Remedy The incoming phases have the incorrect sequence only applies to 3 phase heat pumps appears after a mi nute when the compressor is starte
48. t start when the heat pump s control computer requests it Check the set value on MAXSTEP in the heat pump s con trol computer If an external auxiliary heater is used check that it is cor rectly installed by test running it in MANUAL TEST EXT AUX HEATER 1 If it does not start at manual test operation check that the start signal voltage comes from the heat pump See wiring diagram If necessary adjust the MAXSTEP value in the heat pump s control computer 230V 1 N MAXSTEP 1 3400 V 3 N MAXSTEP 1 5 MAXSTEP 1 3 kW MAXSTEP 2 6 kW MAXSTEP 3 9 kW MAX STEP 4 12 kW cannot cut in when the compressor is running MAX STEP 5 15 kW cannot cut in when the compressor is running Connect the external auxiliary heater ac cording to the instructions Measure the voltage on the I O card s probe L2 Oil Electricity 10 Closed or partially closed thermostats valves in the heating system Check that the thermostats valves in the heating system are open Open closed thermostats valves 11 The total output of the heat pump and auxiliary heater is too low in relation to the building s power de mand 12 Under dimensioned heating system What is the building s power demand What is the output of the heat pump What is the output of the auxiliary heater what is it set to Check existing heating system What output is it dimensioned for to produce at what sup ply temperature
49. tension cables 3 Then measure the sensor only A To ensure the sensor value the actual temperature must be checked against the measured resistance Thermia V rmepumpar VIIFM102 Thermia N Service Instructions Atec 3 3 2 Positioning sensors 4 3 Atec Total 1 DISCHARGE PIPE SENSOR 2 SUCTION TEMP SENSOR 3 REFR 1 SENSOR 4 REFR 2 SENSOR 5 DEFROST SENSOR located to rear beside air intake 6 OUTDOOR SENSOR positioned on wall to north 7 SUPPLY LINE SENSOR 8 HOT WATER TOP 9 HOT WATER SENSOR RETURN LINE SENSOR Located on return pipe that runs to heat pump See sys tem solution in the Installation instructions Atec Plus 3 4 Check points Temperatures Condensing temperature 0 5 1 5 C above supply line temperature Evaporation temperature 7 8 C Radiator circuit 8 K temperature difference Overheating R407C 4K 1 K VIIFM102 Thermia Varmepumpar mm N Service Instructions Atec Pressure switch pressure transmitter Break pressure Refrigerant R407C OP operating pressure switch 2 85 MPa High pressure switch 3 10 MPa Pressure transmitter low pressure 0 04 MPa Following parameters can be read off in the display Suction gas temperature Evaporation pressure Evaporation temperature calculated from Dew point Opening percent EXV Superheating This means new opportunities to diagnose the heat pump without having to remove the covers when working on the cooling circuit In norma
50. the heat pump s control computer It must be adjusted to the unit s maximum supply temperature and the sys tem s delta temperature so that it does not cut at too high a return temperature when the highest supply temperature is transmitted Check what the return line sensor shows Is it a plausi ble actual value If not take a resistance reading from the sensors and check against the ohm table in Meas urement points If the MAX RETURN value is not adjusted for the system according to the troubleshoot ing window adjust it If the sensor is defective replace it VIIFM102 Thermia Varmepumpar Service Instructions Atec mm K Cause Troubleshooting Remedy 6 The compressor runs backwards The incoming phases have the incorrect sequence only applies to 3 phase heat pumps If the compressor runs back wards it will not cope with compressing the refrigerant and therefore does not pro duce the correct power which leads to the control system requesting auxiliary heating f the text ERR PHASE SEO appears in the display when the heat pump is powered only appears in the first 10 minutes this means that the phases have the incorrect sequence When the compressor is running check the pressure pipe temperature by feeling the pressure pipe If the phases are correctly sequenced it should be hot not just warm even a distance from the compressor When the compressor runs with th
51. turn line Bleed the system A Large temperature difference can indi cate air in the system 4 Start temperature set too high for hot water produc tion Check that the start temperature is correctly set Should not be set above the factory set value Ifthe start value is set too high reduce it to the factory set value VIIFM102 Thermia Varmepumpar Service Instructions Atec Thermia Cause Troubleshooting Remedy 5 Sensor fault hot water sensor Hot water production is star ted by the hot water sensor Check what the hot water sensor the start sensor shows Is it a plausible actual value Measure the resistance of the sensor check against the ohm table in Measurement points If the sensor is defective replace it 6 Large drain flow gt 12 min Check how many litres of hot water approx 40 C per mi nute drains from the tap Use a clock and bucket to meas ure the drain flow If the drain water flow is greater than 12 1 min stratification in the water heater is af fected which reduces the hot water capaci ty Suggested corrective actions Install a pressure reduction valve on the incoming cold water pipe Change to a mixer with lower flow Adjust the drain flow on the existing mixer do not open the tap fully 7 Water heater too small in relation to reguirement How large is the reguirement and what is the capacity of th
52. ure several times If this does not help replace the circulation pump Thermia V rmepumpar VIIFM102 E Service Instructions Atec Problem Operating pressure switch open alternatively high hot gas temperature nm N Cause Troubleshooting Remedy 1 Operating pressure switch function 1 Switch off the main switch for the heat pump wait until the compressor has been stationary for at least 15 minutes 2 Disconnect the two cables on the pressure switch us ing a buzzer checkif the pressure switch is closed If the pressure switch is closed bridge the pressure switch cables temporarily and switch on the voltage to the heat pump again If there is an indication O zero in the display this means that the pressure switch is fault free and the problem is in the wiring or in the circuit board If the pressure switch is open try carefully tapping the head of the pressure switch with a screwdriver and use a buzzer test to see if it has closed again Replace the pressure switch if it appears to jam repeatedly 2 Fault in the discharge pipe sensor Check what the discharge pipe sensor shows Is it a plausi ble actual value Measure the resistance of the discharge pipe sensor check against the ohm table in Measurement points If the discharge pipe sensor is defective re place it 3 Hot gas temperature too high The discharge pipe sensor displays more than 140 C See operating dat
53. uxiliary heating If the text ERR PHASE SEQ appears in the display when the heat pump is powered only appears in the first 10 minutes this means that the phases have the incorrect sequence When the compressor is running check the pressure pipe temperature by feeling the pressure pipe If the phases are correctly sequenced it should be hot not just warm even a distance from the compressor When the compressor runs with the phases incorrect ly sequenced a strange noise may be heard loud rat tling when the compressor runs backwards If the phases are in the incorrect order switch two incoming phases at the main terminal block and recheck according to the troubleshooting window 7 The built in overheating protection bi metal protec tion in the compressor has tripped Check if the heat pump s control computer indicates that the compressor is in operation and if there is voltage in the soft starter control inputs Then read off and check that there is voltage on the compressor s electrical connec tion s If there is voltage on the compressor s elec trical connection s and the overheating protection does not close when the com pressor has not run and has cooled down for at least 1 hour replace the compressor Problem The heat pump consumes too much energy Cause Troubleshooting Remedy 1 Blocked strainer in the heating system Check that the strainer is not blocked
54. val The compressor should then start to produce hot water and 2 minutes later the auxiliary heater starts The compressor must then stop and the stop temperature be reached with only the auxiliary heater connected Take no corrective action this is normal 3 The compressor cannot run due to an alarm Check the alarm that is indicated in the display Rectify the problem and rest the alarm 4 The heat pump has stop ped on high return a Check what the MAX value is set at in the heat pump s control computer It must be adjusted to the unit s maximum supply temperature and the system s delta temperature so that it does not cut at too high a re turn temperature when the highest supply tempera ture is transmitted Check what the return line sensor shows Is it a plausi ble actual value If not take a resistance reading from the sensors and check against the ohm table in Meas urement points If the MAX RETURN value is not adjus ted for the system according to the troubleshooting window adjust it Ifthe sensor is defective replace it Thermia Varmepumpar VIIFM102 Service Instructions Atec nm N Cause Troubleshooting Remedy 5 The compressor has been stopped by the operating pressure switch or delivery line sensor Check if a square appears in the display s lower left corner If so the operating pressure switch is open or the delivery pipe sensor triggers an alarm f
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