Nobu NBL4-09IDU32 Service Manual page 52

Service Manual
Outdoor unit:
(1) Capacitor charge fault (Fault with outdoor unit) (AP1 below refers to the outdoor control panel)
Main Check Points:
●Use AC voltmeter to check if the voltage between terminal L and N on the wiring board is within 210VAC~240VAC.
●Is the reactor (L) correctly connected? Is the connection loose or fallen? Is the reactor (L) damaged?
Fault diagnosis process:
Voltage higher than 200V?
Measure the AC voltage between
terminal L and N on wiring board
XT(power supply)
Shut down the power and wait 20 minutes;
or use DC voltmeter to measure the voltage
on the two ends of capacitor , until the
voltage is lower than 20V
48
Turn on the unit
and wait 1 minute
Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor
Yes
No
Voltage within
No
210VAC~250VAC?
Yes
Check the
connection of reactor
(L in the Electrical
Wiring Diagram)
If the wiring of
No
reactor L is normal?
Yes
Replace the control
panel AP1
End
Fault with the voltage
Replace the control
testing circuit on
panel AP1
control panel AP1
Shut down the power
power on and
and repair the power
restart the unit
supply to restore the
range
210VAC~250VAC
Connect the reactor
Laccording to Elec-
Re-energize and
trical Wiring Diagr-
turn on the unit
am correctly
No
If the fault is
eliminated?
No
If the fault is
eliminated?
Installation and Maintenance
Service Manual
Yes
Yes
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