Danfoss Heat Pump Troubleshooting Guide download pdf (Page 4)

VMIFB202

Hot gas temperature too high

See in service under heat pump also check using own digital thermometer.

Action:

Check the refrigerant circuit see section below

The discharge pipe sensor displays correctly but still has high overheating

Action:

Using manometer apparatus and a digital thermometer check what the cooling and overheating reading of the unit is.

Also check that bulb and capillary tube are undamaged and that the bulb is correctly positioned. (Bulb is positioned at two o’clock in

the suction pipe).

If the cooling is correct according to the instructions try adjusting the overheating using the expansion valve, if the overheating cannot

be adjusted using the expansion valve or if the capillary tube or bulb are damaged replace it.

Lack of refrigerant, not enough refrigerant in the hp cooling circuit.

Action:

Using manometer apparatus and a digital thermometer, check that the unit’s cooling and overheating is correct for the specic

refrigerant.

If cooling is not at the correct level compared with the specic refrigerant and is too low, there is insucient refrigerant in the unit.

If there appears to be a leak in the refrigerant circuit, carry out leak tracing and any necessary corrective action. If leak tracer is not

available, brush soap water on the suspected leak and look for bubbles.

Also check if oil has leaked. In event of leakage oil usually comes from the refrigerant circuit.

Troubleshooting Guide Working pressostat and high pressure pipe

Discharge

pipe sensor

location

temperatur ohm

-30 1884

-25 1443

-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

temperatur kohm

0 66.3

5 52.4

10 41.8

15 33.5

20 27.1

25 22

30 18

35 14.8

40 12.2

45 10.1

50 8.5

55 7.1

60 6

65 5

70 4.2

75 3.7

80 3.1

85 2.7

150 ohm sensor

Outdoor / Defrost sensor

22 kohm sensor

Supply line, return line, hot water,

brine in, brine out, discharge pipe sensor

1 2 3 4 5 6 7 8 9 ... 33 34

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Danfoss Heat Pump Troubleshooting Guide Page 4

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