Daikin RXTA30B2V1B Service Manual page 60

4 | Components
Service manual
60
U Wire terminal U
V Wire terminal V
W Wire terminal W
CAUTION
Before measuring the compressor motor windings resistance, measure the
resistance of the multimeter probes by holding the probes against each other. If the
measured resistance is NOT 0 Ώ, this value MUST be subtracted from the measured
winding resistance.
4 Measure the resistance between the compressor motor windings U-V, V-W
and U-W.
Result: All measurements MUST be 1.114±5% Ω and equal.
Compressor motor winding
measurements are correct?
Yes
No
5 Measure the continuity of the U, V and W wires between the compressor and
the PCB. If no continuity, correct as needed, see
6 Install the compressor wire terminals cover.
7 Install the compressor insulation.
8 Turn ON the power using the respective circuit breaker.
9 Start the unit operation via the user interface.
CAUTION
NEVER operate the compressor with the compressor wire terminals cover removed.
10 Wait for – or create condition to operate the compressor.
11 Once the compressor operates, measure the U-V-W inverter voltages.
ALWAYS measure at the PCB side.
Result: All measurements MUST be the same.
V U
W
Action
Continue with the next step.
Replace the compressor, see
"4.2.2 Repair procedures" [
"7.2 Wiring
RXTM-R+RXTP-R+ARXTP-R+RXTA-B+FTXTA30B2V1B(W)
(B)+FTXTM30+40R2V1B+FTXTP25+35M5V1B+ATXTP25+35M5V1B
4
62].
4
diagram" [ 232].
R32 Optimized Heating 4 Split
ESIE21-12A – 2022.02