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Service Manual
TROUBLESHOOTING
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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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Summary of Contents for YVAHP072B31S
Page 2: ......
Page 10: ...viii Service Manual ...
Page 16: ......
Page 17: ...Service Manual 1 1 INSTALLATION 1 Installation ...
Page 577: ...Service Manual 1 561 INSTALLATION 9 Touch Back to return to the Service Menu screen 9 ...
Page 920: ......
Page 921: ...Service Manual 2 1 OPERATION 2 Operation ...
Page 1315: ...Service Manual 3 1 TROUBLESHOOTING 3 Troubleshooting ...
Page 1461: ...Service Manual 4 1 MAINTENANCE 4 Maintenance ...
Page 1728: ......
Page 1729: ...Service Manual 6 1 FIELD WORK INSTRUCTIONS 6 Field Work Instructions ...
Page 1738: ...6 10 Service Manual FIELD WORK INSTRUCTIONS 6 8 Mollier Chart for R410A ft 3 l b ...
Page 1739: ...SERVICE PARTS LIST Service Manual 7 1 7 Service Parts List ...
Page 1795: ......
Page 1796: ... 2015 Johnson Controls Inc SM 15001 ...