Daikin RXTA30B2V1B, Service Manual

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4 | Components
Service manual
90
RXTM-R+RXTP-R+ARXTP-R+RXTA-B+FTXTA30B2V1B(W)
(B)+35M5V1B
R32 Optimized Heating 4 Split
ESIE21-12A – 2022.02
To perform an electrical check of the DC fan motor assembly
FTXTA-B and FTXTM-R units
Prerequisite: First perform a mechanical check of the DC fan motor assembly, see
"4.8.1 Checking procedures" [
4
89].
1 Remove the cover from the switch box; see "4.17 Plate work" [
4
144].
2 Disconnect the DC fan motor connector from the appropriate PCB.
3 Measure the resistance between the pins 1-2, 1-3, and 2-3 of the DC fan
motor connector.
Result: All measurements MUST be approximately the same.
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
"4.8.2 Repair procedures" [ 4 90].
FTXTP-M and ATXTP-M units
Prerequisite: First perform a mechanical check of the DC fan motor assembly, see
"4.8.1 Checking procedures" [ 4 89].
1 Remove the cover from the switch box; see "4.17 Plate work" [ 4 144].
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
"4.8.2 Repair procedures" [
4
90].
4.8.2 Repair procedures
To remove the DC fan motor assembly
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.