18
Technical Information
YES
YES
YES
YES
YES
NO
NO
Energize and switch on
Does 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)
Is the voltage
between terminal L and N
on wiring board XT is within
210VAC~250VAC?
Check the supply
voltage and restore it to
210VAC~250VAC
Voltage between
the two ends of
electrolytic is higher
than 250v
Restart the unit. Before protection occurs,
use DC voltmeter to measure the voltage
between the two ends of electrolytic
capacitor on control panel AP1
Does the unit
work normally?
Stop the unit and
disconnect the power
supply. Then, check the
connection of capacitor
C2 according to Electrical
Wiring Diagram.
The connection of
capacitor C2 is loose
Reconnect the capacitor C2
according to Electrical Wiring
Diagram. Then, Restart the unit.
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.
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
Does the unit
work normally?
Please confirm:
1. If the indoor and outdoor
heat exchangers
are dirty? Are they
obstructed by other
objects which affect the
heat exchange of indoor
and outdoor unit.
2. If the indoor and outdoor
fans working normally?
3. If the environment
temperature is too
high, this will result in
the system pressure
exceeding the
permissible range?
4. Is the charge volume of
refrigerant is too much?
5. Other conditions
resulting in the system
pressure becoming too
high.
Has capacitor
C2 failed?
Replace the capacitor C2. Then
start the unit.
Replace the control panel AP1
Are there any abnormality
described above?
Take corrective actions according
to Technical Service Manual, and
then energize and start the unit.
Connect the control panel AP1 and compressor
COMP correctly according to the Electrical Wiring
Diagram. Then start the unit.
Does the unit
work normally?
Is the resistance normal?
Replace the compressor comp
Resistance higher than 500M
Ω
?
Replace the control panel AP1
End
Refer to the Electrical Wiring
Diagram and check if the
connection between AP1
and COMP is loose and if the
connection order is correct.
Is the connection between AP1
and COMP 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.
YES
NO
YES
YES
YES
NO
YES
NO
NO
Does the unit
work normally?
YES
Does the unit
work normally?
Replace the control panel AP1
NO
NO
YES
NO
NO
YES
