Installation Condition Check - Daikin FTXM-K Series Service Manual

Check
42/50 class
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation off and power off. Disconnect the connector S70.
2. Check that the voltage between the pins 4 - 7 is 320 VDC.
3. Check that the control voltage between the pins 3 - 4 is 15 VDC.
4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 6.5 VDC.
5. Keep operation off and power off. Connect the connector S70.
6. Check whether 4 rotation pulses (0 ~ 15 VDC) are input at the pins 1 - 4 when the fan motor
When the fuse is melted, check the outdoor fan motor for proper function.
5.9

Installation Condition Check

Check No.17
103
is rotated 1 turn by hand.
If NG in step 2 → Defective PCB
If NG in step 4 → Defective Hall IC → Replace the outdoor fan motor.
If OK in both steps 2 and 4
PCB
S70
1
2
3
4
5
6
7

Installation condition check

Check the allowable
dimensions of the air
suction and
discharge area.
OK
Is the discharged air
short-circuited?
NO
Is the outdoor heat
exchanger very dirty?
NO
Is the airflow blocked by
obstacles or winds
blowing in the opposite
direction?
YES
→ Replace the outdoor unit PCB (main PCB).
→ Replace the outdoor unit PCB (main PCB).
Actual rotation pulse input (0 ~ 15 VDC)
Rotation command voltage (0 ~ 6.5 VDC)
Control voltage 15 VDC
320 VDC
NG
YES
YES
NO
SiBE041434E
(R19655)
Change the installation
location or direction.
Change the installation
location or direction.
Clean the outdoor heat
exchanger.
Check the outdoor
temperature. (The outdoor
temperature should be
within the operation range.)
Change the installation location
or direction.
(R19401)
Service Diagnosis