Lennox Y6334, Руководство по обслуживанию

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49
Installation and Maintenance
Service Manual
(1) Malfunction of Desynchronizing of Compressor (H7)
Main check point:
Whether the system pressure is too high?
Whether the electronic expansion valve can work normally?
Whether the radiation for the unit is in good condition?
Malfunction diagnosis process:
Outdoot Unit
Desynchronizing malfunction
occurs after de-energizing
and turning on the unit
Whether stop time for
compressor is more than 3min?
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Whether valve of outdoor unit is
opened?
Whether wire connection for
compressor is correct?
Open the valve
Is malfunction eliminated?
Connect wire correctly
Is malfunction eliminated?
Replace electronic
expansion valve
Is malfunction eliminated?
End
Replace compressor
Is malfunction eliminated?
Replace main board of
outdoor unit
Whether electronic expansion
valve is damaged?