22
Installation and Maintenance
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:
Energize the unit
and start it
If the compressor wire COMP(UVW) is
well connected and connection sequence
is correct
.
Replace control board AP1
Replace the
compressor
If malfunction is
removed?
If the stop time of compressor
is more than 3
min?
N
If the stop time is not enough and the
high and low pressure of system is not
balance
d
, please start it after 3
min
.
Improve the connection situation
of control board AP1 and
compressor COMP, connect it
with wiring diagram
.
N
Y
N
If the refrigerant charging is
too much?
Y
Does the unit start
up normally?
N
Charge the
refrigerant according
to
service manual
.
Y
Does the unit start
up normally?
N
Y
End
