Johnson Controls P Series Installation And Maintenance Manual page 31

4.Diagnosis for failure start up malfunction (AP1 below is control board of outdoor unit)
Main detection point:
● If the compressor wiring is correct?
● If the stop time of compressor is enough?
● If the compressor is damaged?
● If the refrigerant charging is too much?
Malfunction diagnosis process:
Installation and Maintenance
Energize the unit
and start it
If the stop time of compressor
is more than 3 min?
Y
If the compressor wire COMP(UVW) is
well connected and connection sequence
is correct.
Y
If the refrigerant charging is
too much?
Y
Charge the
refrigerant according
to service manual.
Does the unit start
up normally?
N
Replace control board AP1
If malfunction is
removed?
N
Replace the
compressor
End
If the stop time is not enough and the
N
high and low pressure of system is not
balanced, please start it after 3 min.
Improve the connection situation
of control board AP1 and
N
compressor COMP, connect it
with wiring diagram.
Does the unit start
up normally?
N
Y
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