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Danfoss Heat Pump Troubleshooting Guide Page 18

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18
VMIFB202
Whistling expansion valve
Action:
Try tapping gently on the expansion valve.
Open and close the valve fully in and out and adjust the expansion valve to the recommended overheating.
(Gas R134-404A 4-8 K, Gas R407C 4 K +-0,5K) Note! Manometer apparatus required!
Check if the noise has stopped.
If the problem persists, replace the expansion valve.
Loud compressor noise
Action:
Check that there is 400V between incoming phases on the heat pump.
Check that there is supply to the heat pump, measure the voltage for all electrical components all the way to the compressor.
In event of phase drop, check where the phase drop is and rectify.
Go into the service menu and activate manual test and run the heat pump
Ensure that the contactor for the compressor is engaged by measuring the control signal
During operation there should be 230V on A1/A2.
On newer heat pumps with soft starter the control signal is on (K1) soft starter A1/A2
The compressor runs backwards
Action:
Check that the incoming phases do not have the incorrect sequence (only applies to 3-phase heat pumps).
If the compressor runs backwards, it will not cope with compressing the refrigerant and therefore does not produce the correct output,
which leads to the control computer requesting auxiliary heating.
If the text Err Phase Seq. is displayed L1 and L3 are incorrectly connected but still correct!
Check if the discharge pipe temperature rises quickly, if it does not switch L1 and L3
When the compressor is running, check the discharge pipe temperature by feeling the discharge pipe. If the phases are correctly seque-
nced it should be hot, not just warm, even a distance from the compressor.
When the compressor runs with the phases incorrectly sequenced a strange loud, rattling noise may be heard when the compressor
runs backwards.
If the phases are in the incorrect order, switch two incoming phases at the main terminal block and recheck the troubleshooting.
Troubleshooting Guide Alarm Sound
Measuring current of input supply to heat pump
1L1-0 must display 230V
1L2-0 must display 230V
1L3-0 must display 230V
1L1-1L2 must display 400V and similar between the others in dierent combinations
Motor protection incoming
1L1-0 must display 230V
3L2-0 must display 230V
5L3-0 must display 230V
1L1-3L2 must display 400V and similar between the others in dierent combinations
Motor protection outgoing
2L1-0 must display 230V
4L2-0 must display 230V
6L3-0 must display 230V
2L1-4L2 must display 400V and similar between the others in dierent combinations
Soft starter
L1-0 must display 230V
L2-0 must display 230V
L3-0 must display 230V
L1-L2 must display 400V and similar between the others in dierent combinations
Compressor
T1-0 must display 230V
T2-0 must display 230V
T3-0 must display 230V
T1-T2 must display 400V and similar between the others in dierent combinations
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