Johnson Controls YVAHP0721CW Series, Service Manual

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Is expansion valve of I.U.
open-locked in cooling operation?
Is expansion valve of O.U.
open-locked in heating operation?
Is supply voltage
AC 208/230V+10%
or AC 460V+10%?
Is refrigerant
overcharged?
Is discharge
pressure high?
Yes
Check capacity
and wiring of
power source.
Check stop valves
and expansion valve.
Check clogging of
heat exchanger.
Check fan motor.
Replace
expansion valve.
Charge refrigerant
correctly.
No
No
Restart operation
after main switch ON.
Check compressor.
No
No
No
No
Is crankcase
heater ON?
Yes
No
Is compressor running current
same as operating current?
Yes
Yes
No
Yes
Yes
Yes
Yes
O.U.: Outdoor Unit
I.U.: Indoor
Unit
In case of 208/230V 60Hz:
Is voltage higher than 177V at any time?
In case of 460V 60Hz:
Is voltage higher than 391V at any time?
In case of 208/230V 60Hz:
Is voltage higher than 177V during operation?
In case of 460V 60Hz:
Is voltage higher than 391V during operation?
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