27
•
If the working loads of the machine are too hight? If the radiation is good?
•
If the charge volume of refrigerant is correct?
Fault diagnosis process:
Energize and switch on
IPM Protection occurs
after the machine has run
for a periode 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?
Check the supply
voltage and restore it
to 210VAC 250VAC
If the unit can
work normall?
Start and run the unit. Before
protection occurs, use DC voltmeter
to measure the voltage between the
two ends of electrolytic capacitor on
control panel AP1.
Voltage between the
two ends of electrolytic
capacitor (tes3) is
higher than 250V.
Stop the unit and disconnect
the power supply. Then,
check the connection of
capacitor C2 according to
wiring diagram.
The connection
of capacitor C2
is loose
Reconnect the capacitor
C2 according to electrical
wiring diagram, then
energize and start 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 (spec).
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
If the unit can
work normally?
If capacitor
C2 is failled?
Replace the capacitor
C2. Then, energize
and start the unit
If the unit can
work normally
Replace the control
panel AP1
Please confirm:
1. In the indoor and
outdoor heat
exchangers 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
and exceeds the
permissible range?
4. If the charge volume
of refrigerant is too
much, resulting in that
the system the system
pressure is too high?
5. Other conditions
resulting in that the
system pressure is
becomes too high.
The corrective actions
according to Technical
Service Manual, and then
energize and start the unit.
If the unit can
work normally
Replace the control panel
AP1.
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?
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.
Use ohmmeter to measure the
resistance between the three terminals
on compressor COMP, and compare
the measurments with the compressor
resistance on servuice manual
If the resistance
is normal?
Replace the
compressor
COMP
Use ohmmeter to measure the
resistance between the two terminals of
compressor COMP and copper tube.
Resistance higher
than 500M
Ω
?
Replace the control panel AP1
End
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Содержание BDS28A
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