Gree GWH12UB-K3DNA4F Service Manual page 74

Service Manual
Energize and
switch on
IPM protection
occurs after the
machine has run for
a period of time?
3. If the environment
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 connection
order is wrong?
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
Installation and Maintenance
Use AC voltmeter
to measure the
voltage between
Yes Y
terminal L and N
on the wiring
board XT)
Voltage between
the two ends of celectrolytic
Yes
Y
capacitor (test3) is
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
Stop the unit and
dirty? If they are
disconnect the power
obstructed by other
supply. Then, check
objects which affect
the connection of
the heat exchange
capacitor C2
of indoor and
according to Electrical
outdoor unit.
Wiring Diagram.
2. If the indoor and
outdoor fans are
working normally?
Remove the wires
on the two ends of
temperature is too
capacitor C2. Then,
high, resulting in
use capacitance
that the system
meter to measure
pressure is too high
and exceeds the the capacitor C2.
Verify as per the
permissible range?
Parameters Sheet.
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
If capacitor
pressure is too
high? C2 is failed?
5. Other conditions
resulting in that the
system pressure
becomes too high.
described above?
Yes
Y
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
higher than
capacitor on control
250V
panel AP1 (test3 )
No
N
The connection
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
Replace the capacitor
Yes Y C2. Then, energize
and start the unit.
Replace the
No N
control panel AP1
If there is any
abnormality
Yes
Y
then energize and start
No
N
control panel AP1
Connect the control panel
AP1 and compressor
COMP correctly according
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
If the
Replace the
resistance is
compressor
No
N
normal?
Resistance higher
than 500M ?
Yes
Y
Replace the
control panel
AP1
END
If the voltage
No N
Y
No
N
Reconnect the
capacitor C2 according
to Electrical Wiring
Yes
Y
Diagram. Then,
of capacitor C2
Restart the
is loose.
unit.
No
N
No N
Take corrective actions
according to Technical
Service Manual, and
the unit.
Replace the
If the unit can
work
normally?
COMP
N
No
Check the supply
voltage and
restore it to
210VAC~250VAC
If the unit can
Y
Yes
work
normally?
If the unit can
Yes
Y
work normallv?
If the unit can
Yes Y
work normally?
N
No
If the unit can
Yes
Y
work normally?
N
No
Yes Y
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