Gree GVH24AK-K3DNC8A Service Manual page 58

Service Manual
Energize and
switch on
IPM protection
occurs after the machine has run for
a period of time?
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?
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
Y
terminal L and N
on the wiring
board XT)
Voltage between
the two ends of celectrolytic
Y
capacitor (test3) is higher than
250V
Please confirm: Stop the unit and disconnect
1. If the indoor and the power supply. Then, check
the connection of capacitor
outdoor heat exchangers
C2 according to Electrical
are dirty? If they are
Wiring Diagram.
obstructed by other
objects which affect the
heat exchange of indoor
and outdoor unit.
2. If the indoor and Remove the wires on the two
ends of capacitor C2. Then,
outdoor fans are
use capacitance meter to
working normally?
measure the capacitor C2.
3. If the environment
Verify as per the
temperature is too
Parameters Sheet.
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
If capacitor
4. If the charge
C2 is failed?
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.
Connect the control panel AP1 and
compressor COMP correctly according
Y
to the Electrical Wiring Diagram.
Then, energize and start the unit.
If the
resistance is
normal?
Resistance higher
than 500M ?
Replace the
control panel AP1
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)
N
The connection
of capacitor C2 is loose.
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
Y C2. Then, energize
and start the unit.
Replace the
N
control panel AP1
Take corrective actions
If there is any
according to Technical
abnormality Service Manual, and
Y
then energize and start
described above?
the unit.
Replace the
N
control panel AP1
Replace the
N
compressor COMP
N
N
END
N
Y
N
Reconnect the capacitor C2
according to Electrical
Y
Wiring Diagram. Then,
Restart the unit.
N
N
N
N
If the unit can
work normally?
Check the supply
voltage and
restore it to
210VAC~250VAC
If the unit can
Y
work normally?
If the unit can
Y
work normallv?
Y
If the unit can
Y
work normally?
Y
55