Table of Contents
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Table of Contents
Related Manuals for Danfoss DHP-AQ Mini
Summary of Contents for Danfoss DHP-AQ Mini
- Page 1 Service instructions DHP-AQ VMGFJ102...
- Page 2 If these instructions are not followed during installation and service, Danfoss A/Sliability according to the applicable warranty is not binding. Danfoss A/S retains the right to make changes to components and specifications without prior notice. © 2011 Copyright Danfoss A/S.
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Page 3: Table Of Contents
Contents About documents and decals ............3 Introduction ..................3 Symbols in documents ..............3 Symbols on decals ................ 3 Terminology ..................5 Important information ..............6 General safety precautions ............6 Refrigerant ..................6 Electrical connection ..............7 Important information ..............7 Commissioning ................ -
Page 5: About Documents And Decals
Sheet with adhesive decals that will be used as translation for the existing English language type plates. The Service instructions and Electrical instructions are available for download here: www.documentation.heatpump.danfoss.com Symbols in documents The instructions contain different warning symbols, which, together with text, indicate to the user that there are risks involved with actions to be taken. - Page 6 Warning symbols Warning, danger! Read the documentation provided. Read the documentation provided. Warning, hazardous electrical voltage! Warning, hot surfaces! Warning, moving parts! Warning, risk of crushing injury! Electrical components Component, normal Component, accessory Outdoor unit Shunt valve Outdoor sensor Exchange valve hot water Hot water sensor Supply line sensor Sensor hot-water top...
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Page 7: Terminology
Pipe connections Bleeding Defrosting tank Expansion tank with safety valve, brine Brine Temperature and pressure relief valve Tap water Outdoor unit Water heater Heating system Terminology Term Meaning Heating system/Heat transfer fluid The circuit that generates heat to the property or to the water heater. circuit Supply line The heating system’s supply line with flow direction from the heat pump to radiators/... -
Page 8: Important Information
Important information General safety precautions Warning! Risk of personal injury! Children are not permitted to play with the product. Caution! 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. Caution! 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 on how the apparatus functions from a safety qualified person. -
Page 9: Electrical Connection
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 Danfoss are void if, when filling with refrigerant other than Danfoss A/S specified refrigerant, if there has not been written notification that the new refrigerant is an approved replacement refrigerant together with other remedies. -
Page 10: Commissioning
Commissioning Caution! The installation may only be commissioned if the heating system is filled and bled. Otherwise the circulation pump can be damaged. Caution! If the installation is only to operate using an auxiliary heater during the installation, ensure that the heating system is filled and bled and that the compressor cannot be started. -
Page 11: Troubleshooting
Troubleshooting 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 required. 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... -
Page 12: Components
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). Note! In event of alarm the heat pump will if possible supply heating to the house, primarily with the compressor, secondarily with the auxiliary heater. -
Page 13: Measurement Points
Operating pressure switch Return line heating system Four-way valve Solenoid Discharge pipe Non-return valve Air heat exchanger 3.2.2 Indoor unit DHP-AQ Mini DHP-AQ Maxi DHP-AQ Midi Position Description Control module (transparent in image) Immersion heater Reversing valve Circulation pump Water heater... - Page 14 Table 1. Outdoor / Defrost sensor Table 2. PT1000 sensor Table 3. Other sensors °C 150 ohm, Ω °C 1000 ohm, Ω °C 22 kilo ohm, kΩ 1884 1000 66,3 1443 1039 52,4 1115 1078 41,8 1117 33,5 1155 27,1 1194 22,0 1232...
- Page 15 3.3.2 Positioning sensors Heat pump DHP-AQ Midi DHP-AQ Maxi Symbol explanation DISCHARGE PIPE SENSOR SUCTION TEMP SENSOR REFR.1 SENSOR REFR.2 SENSOR DEFROST SENSOR (located to rear beside air intake) OUTDOOR SENSOR (positioned on wall to north) SUPPLY LINE SENSOR HOT WATER TOP HOT WATER SENSOR RETURN LINE SENSOR - Located on return pipe that runs to heat pump.
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Page 16: Check Points
Check points Table 4. Temperatures Name Values 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 Table 5. Break pressure switch/pressure transmitter Refrigerant Pressure switch/pressure transmitter Break pressure R407C... - Page 17 3.5.1 Alarm Table 6. Problem – Alarm LP (lower pressure transmitter) Cause Troubleshooting Remedy • 1. Cable break or loose cable to lower If a cable has come loose, reconnect it. Check that both cables are connected pressure transmitter. to the lower pressure transmitter. If there is a cable break, replace the •...
- Page 18 Cause Troubleshooting Remedy 5. Shut-off main tap in heating sys- Check that the main tap is open. Open closed main tap. tem. • 6. Cable break or loose cable to high If a cable has come loose, reconnect it. Check that both cables are connected pressure switch.
- Page 19 Cause Troubleshooting Remedy 12. Blocked condenser on the water If there is no strainer in the heating sys- If the condenser is thought to be side. tem, there is a risk of dirt sticking in the blocked, try flushing it. If this does not condenser and blocking it.
- Page 20 Cause Troubleshooting Remedy 5. Defective or incorrectly set motor Use a hook-on meter to establish when If the motor protection is defective, protection. the motor protection deploys, check what replace it. the motor protection is set to. If incorrectly set, adjust to the correct Compare with the table.
- Page 21 Table 11. Problem – Alarm electric heater error Cause Troubleshooting Remedy 1. The overheating protection has trip- Check if the overheating protection has If the overheating protection has trip- ped. tripped. ped, reset it. • 2. Phase drop. If the overheating protection has trip- Check if the overheating protection ped, reset it.
- Page 22 Table 13. Problem – Operating pressure switch open alternatively high hot gas temperature Cause Troubleshooting Remedy 1. Operating pressure switch, func- Switch off the main switch for the If the pressure switch is closed, bridge tion. heat pump, wait until the com- the pressure switch cables temporarily pressor has been stationary for at and switch on the voltage to the heat...
- Page 23 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 refrig- erant side. • 7. Associated leakage in the con- If the condenser has a leak, replace it.
- Page 24 Table 16. Problem – Loud compressor noise Cause Troubleshooting Remedy 1. Phase drop. Check that there is 400 V between Check where the phase drop is and rec- incoming phases on the heat tify. The compressor attempts to start or pump.
- Page 25 3.5.4 Hot-water Table 19. Problem – Temperature and/or quantity Cause Troubleshooting Remedy 1. Defective 3-way valve motor. Check the function of the reversing valve If the motor is defective, replace it. by test running it manually. 2. Jammed reversing valve. Detach the motor and test closing and If it jams, replace with a new one.
- Page 26 Cause Troubleshooting Remedy 9. Insufficient exchange surface to Is the exchange surface too small? Replace with a heater with a larger transfer the heat pump’s output to the exchange surface. Can the heater cope with the heat pump’s heater. output? (Only applies to heat pumps with a separate heater.) 10.
- Page 27 Cause Troubleshooting Remedy 4. The 3-way valve has jammed in hot Check the function of the 3-way Is the motor being supplied with voltage water mode. valve motor by test running it according to the wiring diagram in both manually. If the motor does not operating instances? shift mode during manual test MANUAL TEST –...
- Page 28 Cause Troubleshooting Remedy 10. Closed or partially closed thermo- Check that the thermostats/valves in the Open closed thermostats/valves. stats/valves in the heating system. heating system are open. 11. The total output of the heat pump What is the building’s power demand? Ensure that available power is at least as and auxiliary heater is too low in relation great as the building’s power demand.
- Page 29 Cause Troubleshooting Remedy 3. Defective 3-way valve motor. Check the function of the 3-way valve Is the motor being supplied with voltage motor by test running it manually. If the according to the wiring diagram in both The motor should set the valve to the motor does not shift mode during manual operating instances? relevant position depending on oper-...
- Page 30 3.5.6 Other Table 23. Problem – The heat pump runs and runs but never stops Cause Troubleshooting Remedy 1. Air in the heating system. Listen for air in the heat pump and heat- Bleed the heating system according to ing system. the installation instructions.
- Page 31 Cause Troubleshooting Remedy • 5. The heat pump has stopped on If the MAX RETURN value is not adjusted Check what the MAX RETURN value is HIGH RETURN. for the system according to the trouble- set at in the heat pump’s control com- shooting window, adjust it.
- Page 32 Cause Troubleshooting Remedy • • 4. The heat pump has stopped on high Check what the MAX value is set at in If the MAX RETURN value is not return. the heat pump’s control computer. It adjusted for the system according must be adjusted to the unit’s maxi- to the troubleshooting window, mum supply temperature and the...
- Page 33 Table 26. Problem – The heat pump consumes too much energy Cause Troubleshooting Remedy 1. Blocked strainer in the heating sys- Check that the strainer is not blocked. Clean the strainer if necessary. tem. 2. The compressor cannot run due to Check the alarm that is indicated in the dis- Rectify the problem and rest the alarm.
- Page 34 Cause Troubleshooting Remedy 8. The compressor has been stopped Check if a square appears in the display’s If the operating pressure switch has by the operating pressure switch or lower left corner. If so, the operating pres- stuck in the open position, try gently delivery line sensor.
- Page 35 Table 27. Problem – Auxiliary heater cuts in too soon Cause Troubleshooting Remedy 1. The heat pump’s control computer Check the ROOM, CURVE, INTEGRAL A1 and Adjust incorrect values in the heat is not set/adjusted to the customer’s INTEGRAL A2 settings pump’s control computer.
- Page 36 3.5.7 Heat pump Table 30. Problem – Noise/loud noise Cause Troubleshooting Remedy 1. Positioning the heat pump. Determine whether the heat pump can Move the heat pump if possible. be moved to a more suitable location. 2. Connection/wall lead-ins. Check that the unit is installed according Rigid mountings can generate noise to the instructions.
- Page 37 VMGFJ102...