Friedrich MRM09Y1J Service Manual

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Installation and Maintenance
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(4) Malfunction diagnosis of startup failure
Main detection points:
Is wiring of compressor correct.
Is the stop time of compressor enough?
Is compressor damaged?
Malfunction diagnosis process:
Energize the
unit and start it
Is the stop time
of compressor more
than 3min
Start it 3 min later
Startup failure?
Is compressor wire connected correctly?
Connect it according
to wiring diagram
Replace parts of outdoor
electric box
Remove the error?
Replace
compressor
finish
(5) Diagnosis of losing synchronism for compressor
Main detection points:
Is pressure of the system too high?
Is voltage too low?
Malfunction diagnosis process:
Adjust
connecting wire
Losing synchronism
upon startup of
the unit
Is the stop time
of compressor more
than 3min
Is wire of compressor
well connected?
Replace parts
of outdoor
electric box
Remove error?
Replace
compressor
Finish
Losing synchronism
during running
Is outdoor fan normal?
Is outdoor fan
blocked by
stuff?
Replace parts
of outdoor
electric box
Remove error?
Replace
compressor
Finish
Is fan well
connected?
Remove
stuff
Reliable
connected?
Replace parts
of outdoor
electric box
Remove error?
Replace
outdoor fan
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Friedrich MRM09Y1J Specifications

General

Brand	Friedrich
Model	MRM09Y1J
Category	Air Conditioner
Language	English