Daikin RTSQ20PY1 Service Manual page 350

Troubleshooting (Heat Reclaim Ventilation)
CHECK 1
Check on connector of fan motor (Power supply cable)
(1) Turn off the power supply.
CHECK 2
(1) Turn off the power supply.
(2) Measure the resistance between Vcc and each phase of U,V,W, and GND and each phase
339
Measure the resistance between phases of U,V,W at the motor side connectors (three-core
wire) to check that the values are balanced and there is no short circuiting, while connector
or relay connector is disconnected.
Red
White
Black
at the motor side connectors (five-core wire) to check that the values are balanced within the
range of ± 20 %, while connector or relay connector is disconnected.
Furthermore, to use a multiple meter for measurement, connect the probe of negative pole
to Vcc and that of positive pole to GND.
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
U
Measure the resistance
V
values between phases
U,V,W.
W
GND
Vcc
Measure the resistance
values between Vcc
W
and U,V,W, and GND
and U,V,W.
V
U
SiBE31-801_C
Troubleshooting