Johnson Controls Z Series Installation And Maintenance Manual page 33

4. Start-up failure (LC) (AP1 below means control board of outdoor unit)
Main detection points:
‰
‰
‰
If the stop time of compressor
COMP(UVW) is well connected and
connection sequence is correct?
25
Turn on the unit
is more than 3min?
Yes
If the compressor wire
Yes
If the refrigerant charging
amount is too much?
Yes
Charge the refrigerant
according to service
manual
Does the unit
start up normally?
No
Replace outdoor
mainboard AP1
Is the malfunction
eliminated?
No
Replace the
compressor
End
The stop time is not sufficient and
the high and low pressure of system
No
is not balanced , please start the unit
after 3min
Check the connection situation
of outdoor mainboard AP1 and
compressor COMP, and the
No
connect it according to wiring
diagram
Does the unit
start up normally?
No
Yes
Yes
Installation and Maintenance