Additional Checks for Troubleshooting
ESIE13-02
Part 4 – Troubleshooting
160
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1
4
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6.10
Check No.11 - 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 con-
firming 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.
P — U
Continuity
P — V
Continuity
P — W
Continuity
U — P
∞
V — P
∞
W — P
∞
U — P
∞
V — P
∞
W — P
∞
P — U
Continuity
P — V
Continuity
P — W
Continuity
*
*
(S2678)
