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11-9. How to Diagnose Trouble in Outdoor Unit
11-9-1. Summarized Inner Diagnosis of Inverter Assembly
Table 11-9-1
Diagnosis/Process fl owchart Item Contents Summary
Replace
outdoor
fan motor.
Remove connector
of compressor.
NG
NG
NG
NO
OK
OK
OK
YES
Check 25A fuse
(Part No.F01).
Does outdoor
fan rotate?
Replace fuse.
Check
electrolytic
capacitor, diode
block (DB01),
etc.
Check
electrolytic
capacitor, diode
(DB01),
etc.
Remove connector
CN300 of outdoor fan
motor, and using a
tester, check resistance
value between every
phases at motor side.
Check
terminal voltage
of electrolytic
capacitor.
BA
Preparation Turn “OFF” the power supply
breaker, and remove 3P
connector which connects
inverter and compressor.
Check Check whether 25A fuse on
the control board assembly
is blown or not. (F01)
• If fuse was blown, be sure
to check the electrolytic
capacitor and diode block.
(DB01)
Connect discharge
resistance (approx. 100,
40W) or soldering iron
(plug) between +, –
terminals of the electrolytic
capacitor (760F) of C14
(with printed CAUTION
HIGH VOLTAGE) on P.C.
board.
Discharging position
(Discharging period
10 seconds or more)
Plug of
soldering
iron
•
Check
Operation Turn on the power breaker,
and operate the air conditioner
in COOL mode by time
shortening.
OK if 760F
DC280 to 380V
Measurement Measure terminal voltage of
the electrolytic capacity.
760F:400WV × 3
Remove CN300 while
pushing the part indicated by
an arrow because CN300 is a
connector with lock.
Check After operation, turn off the
power breaker after 2 minutes
20 seconds passed, and
discharge the electrolytic
capacitor by soldering iron.
Check voltage between motor
phases.
Stop
Check
Measurement
Is not winding between a-
b‚ b-c, or a-c opened
or short-circuited?
•
Resistance between
phases should be approx.
55 to 77
Is not frame grounded with
a, b, or c?
• Should be 10M or more.
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