Air-Con ACZCI4C4R12, Service Manual

Page: 53 / 81

50
Installation and Maintenance
Service Manual
Energize and
switch on
IPM protection
occurs after the machine has run for
a period of time?
Use AC voltmeter
to measure the
voltage between
terminal L and N
on the wiring
board XT)
If the voltage
between terminal L and N on wiring
board XT is within
210VAC~250VAC?
Restart the unit. Before
protection occurs,use DC
voltmeter to measure the
voltage between the two
ends of electrolytic
capacitor on control
panel AP1 (test3)
Voltage between
the two ends of celectrolytic
capacitor (test3) is higher than
250V
Y
Check the supply
voltage and
restore it to
210VAC~250VAC
Y
N
If the unit can
work normally?
N
Stop the unit and disconnect
the power supply. Then, check
the connection of capacitor
C2 according to Electrical
Wiring Diagram.
N
The connection
of capacitor C2 is loose.
Reconnect the capacitor C2
according to Electrical
Wiring Diagram. Then,
Restart the unit.
If the unit can
work normallv?
Y
Stop the unit and disconnect the
power supply. Wait 20 minutes,
or use DC voltmeter to measure
the voltage between the two
ends of capacitor C2, until the
voltage is lower than 20V
N
N
Remove the wires on the two
ends of capacitor C2. Then,
use capacitance meter to
measure the capacitor C2.
Verify as per the
Parameters Sheet.
If capacitor
C2 is failed?
Replace the capacitor
C2. Then, energize
and start the unit.
Y
ᴎ㒘ৃҹℷᐌᎹ԰
Replace the
control panel AP1
N N
Y
Y
Y
Please confirm:
1. If the indoor and
outdoor heat exchangers
are dirty? If they are
obstructed by other
objects which affect the
heat exchange of indoor
and outdoor unit.
2. If the indoor and
outdoor fans are
working normally?
3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
4. If the charge
volume of refrigerant is
too much, resulting in
that the system
pressure is too high?
5. Other conditions
resulting in that the
system pressure
becomes too high.
Y
If there is any
abnormality
described above?
Take corrective actions
according to Technical
Service Manual, and
then energize and start
the unit.
Y
If the unit can
work normally?
Y
Replace the
control panel AP1
N N
Refer to the Electrical Wiring
Diagram and check if the
connection between AP1 and
COMP is loose and if the
connection order is correct.
If the connection
between AP1 and COMP is unsecure
or the connectionorder is wrong?
Connect the control panel AP1 and
compressor COMP correctly according
to the Electrical Wiring Diagram.
Then, energize and start the unit.
If the unit can
work normally?
Y
Y
Use ohmmeter to measure the
resistance between the three
terminals on compressor COMP,
and compare the measurements
with the compressor resistance on
Service Manual.
If the
resistance is
normal?
Replace the
compressor COMP
N
Use ohmmeter to measure the
resistance between the two
terminals of compressor
COMP and copper tube.
Resistance higher
than 500M?
N
Replace the
control panel AP1
N
END