Danfoss DHP-AQ Series Service Instructions Manual Download Page 14 | Manualshive

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3.3.2

Positioning sensors

Heat pump

7

8

9

DHP-AQ Maxi

7

DHP-AQ Midi

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.

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

Service Instructions

DHP-AQ

VMGFJ202

Danfoss Heating Solutions

14

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Summary of Contents for DHP-AQ Series

Page 1: ...MAKING MODERN LIVING POSSIBLE Service Instructions DHP AQ www heating danfoss com...

Page 2: ...anty 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 D...

Page 3: ...mation Safety regulation 6 2 1 General safety precautions 6 2 2 Refrigerant 7 2 3 Electrical connection 8 2 4 Water quality 8 2 5 Commissioning 9 3 Troubleshooting 10 3 1 Alarm 10 3 2 Components 11 3...

Page 4: ...lation Supplied with the heat pump on delivery The Service instructions and Wiring diagrams are available for download here www documentation heatpump danfoss com 1 2 Symbols in documents The instruct...

Page 5: ...alve 304 Circulation pump 363 Exchange valve hot water 365 Supply line sensor 366 Return line sensor 406 or 62 Room sensor 408 EVU 417 Defrost sensor Explanation Component ordinary delivery according...

Page 6: ...om a safety qualified person Caution The heat pump must be located in a frost free environment Caution The heat pump must be placed in an area with a floor drain Caution The heat pump must be located...

Page 7: ...ied engineer 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...

Page 8: ...by an authorized electrician and must follow applicable local and national regulations Caution The electrical installation must be carried out using permanently routed cables It must be possible to is...

Page 9: ...culation pumps can be damaged Caution If the installation is only to be driven by the immersion heater during the installation ensure that the heating system is filled and the brine pump and compresso...

Page 10: ...PPLY 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 tempera...

Page 11: ...condarily with the auxiliary heater Hot water will stop to indicate that something noteworthy has occurred 3 2 Components 3 2 1 Outdoor unit 11 10 12 13 14 16 15 17 1 2 3 4 5 6 7 8 9 19 18 Fig 1 Compo...

Page 12: ...5 DHP AQ Maxi 1 Control module transparent in image 2 Immersion heater 3 Reversing valve 4 Circulation pump 5 Water heater 3 3 Measurement points Caution When reading the resistance of the sensors the...

Page 13: ...50 1194 8 5 55 7 1 60 1232 6 0 65 5 0 70 1271 4 2 75 3 7 80 3 1 85 2 7 3 3 1 Measurement checking sensors during fault tracing 1 Disconnect the relevant sensor from I O card terminal block 2 Measure t...

Page 14: ...orth 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 3 4 Check points Tem...

Page 15: ...ist 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 troubleshooti...

Page 16: ...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 i...

Page 17: ...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 conden...

Page 18: ...place 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 betwee...

Page 19: ...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 sy...

Page 20: ...e 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 refrig...

Page 21: ...e 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...

Page 22: ...s 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 pre...

Page 23: ...n 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 sm...

Page 24: ...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 RE...

Page 25: ...valves 11 The total output of the heat pump and auxiliary heater is too low in relation to the building s power de mand What is the building s power demand What is the output of the heat pump What is...

Page 26: ...ve 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 functio...

Page 27: ...ess 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 t...

Page 28: ...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 ala...

Page 29: ...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 au...

Page 30: ...e 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 l...

Page 31: ...he 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 pressu...

Page 32: ...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 U...

Page 33: ...d that it is correctly calibrated 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...

Page 34: ...Service Instructions DHP AQ VMGFJ202 Danfoss Heating Solutions 34...

Page 35: ...Service Instructions DHP AQ Danfoss Heating Solutions VMGFJ202 35...

Page 36: ...rves the right to alter its products without notice This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifica...

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