Daikin Sensira Series, Service Manual

Page: 65 / 172

2 | Components
Service manual
65
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
To perform a mechanical check of the DC fan motor assembly
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "2.10 Plate work" [
4
101].
1 Check the fan for damage, deformations and cracks. Replace the fan as
needed.
2 Check that the fan is correctly installed on the DC fan motor. Correct as
needed.
3 Manually rotate the fan and check the friction of the DC fan motor shaft
bearing.
Is the DC fan motor shaft friction
normal? Action
Yes Perform an electrical check of the DC
fan motor assembly, see
"2.5.1 Checking procedures" [
4
64].
No Replace the DC fan motor assembly, see
"2.5.2 Repair procedures" [ 4 65].
To perform an electrical check of the DC fan motor assembly
Prerequisite: First perform a mechanical check of the DC fan motor assembly, see
"2.5.1 Checking procedures" [
4
64].
1 Remove the cover from the switch box; see "2.10 Plate work" [ 4 101].
2 Disconnect the DC fan motor connector from the appropriate PCB.
3 Measure the resistance between the pins 6-9, 6-12, and 9-12 of the DC fan
motor connector.
Result: All measurements MUST be 71.6~82.4 Ω.
4 Check the diode module by measuring the voltage between the following pins
of the DC fan motor connector.
VDC Comm Voltage
1 3 0.992 V DC
2 3 1.433 V DC
3 1 OL
3 2 OL
DC fan motor measurements are
correct? Action
Yes Return to the troubleshooting of the
specific error and continue with the
next procedure.
No Replace the DC fan motor, see
"2.5.2 Repair procedures" [
4
65].
2.5.2 Repair procedures
To remove the DC fan motor assembly
Prerequisite: Stop the unit operation via the user interface.