Johnson Controls Z Series Installation And Maintenance Manual page 43

5. Diagnosis for failure start up malfunction (AP1 below is control board of outdoor unit)
Main detection point:
If the compressor wire COMP(UVW) is
well connected and connection sequence
35
Energize the unit
and start it
If the stop time of compressor
is more than 3min?
Yes
is correct
Yes
If the refrigerant charging is
too much?
Yes
Charge the
refrigerant according
to service manual
Does the unit start
up normally?
No
Replace control board AP1
If malfunction is
removed?
No
Replace the
compressor
End
If the stop time is not enough and the
No high and low pressure of system is not
balance , please start it after 3min
Improve the connection situation
of control board AP1 and
N
No
compressor COMP, connect it
with wiring diagram
Does the unit start
up normally?
No N
Yes
Installation and Maintenance