Daikin RZQS100B7V3B [261/344] And continuity may be reversed

Daikin RZQS100B7V3B [261/344] And continuity may be reversed
Troubleshooting by Remote Controller Display / LED Display SiBE27-702
248 Troubleshooting
Outdoor Unit: Check for Power Transistor
Judgment according to the continuity check by using an analog tester:
(1) Do not touch the charged area (high voltage) for 10 minutes after turning the power supply
off.
(2) If you must touch such an area, make sure that the power supply voltage of power transistor
is 50 V or less.
(3) Disconnect the connector of the outdoor unit fan motor.
When the outdoor unit fan is rotating against a strong wind, the condenser is charged and
electric shock may result. Therefore, disconnect the connector from the outdoor unit fan
motor after confirming that the outdoor unit fan has stopped.
(4) Before measuring the continuity, disconnect the connection between compressor and power
transistor.
(5) Measure the continuity in the following procedure.
[Judgment] Normal if the continuity check results in the following.
Power transistor
(on inverter PC
board)
*
If there is continuity, the resistance should be the same as each phase.
*
If a digital tester is used for the measurement of continuity,
and continuity may be
reversed.
Check No.11
C+— U Continuity
C+— V Continuity
C+— W Continuity
U— C+
V— C+
W— C+
C- — U
C- — V
C- — W
U— C- Continuity
V — C- Continuity
W — C- Continuity
(S2678)

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