70
Notes on the compressor service
When checking the inverter output, remove all the compressor wires.
Checking the inverter output
1
Shut down the power.
2
Remove all the leads from the compressor.
3
Turn on the power, and then start cooling or heating.
Be careful not to touch the fasten terminals of the compressor leads or other parts of the set box.
4
Check the compressor lead output voltage on the inverter.
If one of the following criteria is not met, replace the IPDU board:
* When reconnecting the compressor lead to the compressor terminal after checking the output, check if the fasten
terminal is not loose. If it is, tighten it with pliers or the like and then connect it.
Checking the compressor coil resistance
1
Shut down the power.
2
Remove the leads from the compressor.
3
Use the tester to check the coil resistance between the phases of each compressor and the
outdoor box resistance.
Does grounding occur?
ĺ
There is no problem if it is 10 M
ȍ
or higher.
Does a short circuit occur between the coils?
ĺ
There is no problem if it is 0.1
ȍ
– 0.4
ȍ
. (Check with the digital tester.)
Checking the outdoor fan motor
1
Shut down the power.
2
Remove the fan motor leads from the outdoor fan IPDU board. (CN703 – CN705)
3
Turn the fan manually. If it does not turn, a fan motor error (lock) has occurred. Replace the fan
motor.
If it turns, use the tester to check the coil resistance between the phases.
There is no problem if it is 1.14 – 1.70
ȍ
. (Check with the digital tester.)
No.
Position to check
Criteria
1
Between red and white
180 V – 260 V
2
Between white and black
180 V – 260 V
3
Between black and red
180 V – 260 V
Summary of Contents for MD-VNK802HEXE
Page 120: ...118 11Owner s Manual Excerpt ...
Page 137: ...135 12Installation Manual Excerpt ...
