Capacitor Voltage Check; Power Module Check - Daikin C-Series Service Manual
Inverter pair duct connected type c-series
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Also See for C-Series:
- Installation manual (104 pages) ,
- Operation manual (27 pages) ,
- Technical manual (73 pages)
Table of Contents
SiBE07-618_C
5.1.9 Capacitor Voltage Check
Check No.12
Before this check, be sure to check the main circuit for short circuit.
With the circuit breaker still on, measure the voltage according to the drawing of the model in
question. Be careful never to touch any live parts.
5.1.10 Power Module Check
Check No.13
Note:
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
Resistance in OK
Resistance in NG
Service Diagnosis
Multimeter
(DC voltage range)
Compressor lead wire
Fan motor lead wire
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the terminals of the DB1 and
the terminals of the compressor with a multi-tester. Evaluate the measurement results for a
judgment.
Reactor lead wire
Electronic expansion valve
lead wire
DB1 (+)
UVW
UVW
DB1 (+)
several kΩ ~ several MΩ
W
V
U
OL lead wire
Thermistor lead wire
Four way valve
lead wire
(R5222)
DB1 (–)
UVW
DB1 (–)
0 Ω or ∞
(R5237)
Check
UVW
99
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