Daikin Sensira Series, Service Manual

Page: 47 / 172

2 | Components
Service manual
47
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Split Sensira R32
ESIE18-12E – 2021.02
Compressor motor winding
measurements are correct? Action
Yes Continue with the next step.
No Replace the compressor, see
"2.2.2 Repair procedures" [
4
49].
5 Measure the continuity of the U, V and W wires between the compressor and
the PCB. If no continuity, correct as needed, see
"5.2 Wiring diagram" [
4
142].
6 Connect the Faston connectors to the compressor wire terminals U, V and W
V U
W
U Wire terminal U
V Wire terminal V
W Wire terminal W
7 Install the compressor insulation.
8 Turn ON the power using the respective circuit breaker.
9 Start the unit operation via the user interface.
10 Wait for – or create condition to operate the compressor.
11 Once the compressor operates, measure the U-V-W inverter voltages. All
measurements MUST be the same.
Inverter voltage measurements are
correct? Action
Yes Continue with the next step.
No Perform a check of the appropriate PCB,
see
"2 Components" [
4
37].
12 Measure the current in each phase U, V and W while compressor is operating.
All measurements MUST be the same.
Compressor motor winding current
measurements are correct? Action
Yes Perform an insulation check of the
compressor, see
"2.2.1 Checking
procedures" [
4
44].
No Preventively replace the compressor,
see
"2.2.2 Repair procedures" [
4
49].