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Daikin RXYQ5PY1 Service Manual Page 212

R-410a heat pump 50hz/60hz cooling only 50hz.
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Appendix
7.14.14 Inferior Insulation of the Compressor before Test Operation
Applicable
VRV in general
Models
Condition
At the time of test operation, compressor was replaced since the insulation was found
insufficient in the insulation measurement with the power not supplied.
Cause
Insulation at the terminal section inside the compressor dropped temporarily due to non-
operational condition of liquid refrigerant accumulated inside the compressor.
Measure
Resolved by supplying power to the crank case heater for 6 hours.
Point of
Measure the insulation resistance of the compressor after supplying power to the crank case
heater for 6 hours.
Diagnosis
7.14.15 No Heating Operation is Available though Cooling Operation is
Possible. (Fan only Operation Continues with no Malfunction
Displayed.)
Applicable
VRV in general
Models
Condition
Compressor for one of two systems failed three times. Noise is heard on the compressor
another system.
Cause
Erroneous connection of wires and pipes.
Measure
Recovers by correcting the connection.
Point of
1. Operate a single indoor unit and check whether cold or hot air is obtained.
Diagnosis
2. Operate also an another indoor unit. Then stop the 1st unit and check whether cold or hot
3. Check the remaining units according to the above steps.
Note:
Please note that, if an operation of another unit is initiated after stopping the 1st unit, the
outdoor unit does not start for a while due to restart protection control.
206
blast is obtained.
SiEN34-705
General Information

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