Johnson Controls YVAHP0721CW Series, Service Manual

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3-36
SM-16007
TROUBLESHOOTING
PROCEDURE REMINDERS:
• Measure the insulation resistance of a failed compressor.
Do not perform an emergency operation when the insulation resistance is 0
:
The other compressors may be damaged because there is a possibility that refrigerant oil is oxidized.
• Total operating capacity of indoor unit should be 90kBtu/h and over.
(Less than 90kBtu/h: Forced stoppage)
• In this emergency operation, compressor frequency cannot be controlled normally.
Therefore, an alarm code “07”, “43”, “44”, “45” or “47” may be indicated on the LCD.
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• This operation is a temporary emergency operation when the inverter compressor is damaged.
Therefore, replace it with the new one as soon as possible.
• Turn OFF DSW5-No.1 and No.2 of the outdoor unit PCB after replacing the compressor.
If this setting is not performed, the inverter compressor will be damaged.
(b) Operation Condition
< Indoor Unit Operation Capacity >
The compressor is forced to stop for compressor protection under the following condition:
Total Capacity of Thermo ON I.U. < 50% of O.U. Capacity and
Total Capacity of Thermo ON I.U. < 90kBtu/h
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because the compressor is operated and stopped repeatedly.)
NOTE:
Thermo-ON: The outdoor unit and some indoor units are running.
Thermo-OFF: The outdoor unit and some indoor units stay on, but don’t run.