Check
6.1.12 Main Circuit Electrolytic Capacitor Check
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
Check No.14
If unavoidably necessary to touch a live part, make sure there is no DC voltage using the tester.
Check the continuity with the tester. Reverse the pins and make sure there is continuity.
6.1.13 Rotating Pulse Input on the Outdoor Unit PCB Check
Check No.15
<Outdoor fan motor>
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 ~ 15 VDC.
5. Keep operation off and power off. Connect the connector S70.
6. Check whether 2 pulses (0 ~ 15 VDC) are output at the pins 1 - 4 when the fan motor is rotated
When the fuse is melted, check the outdoor fan motor for proper function.
157
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 → Replace the PCB.
PCB
S70
1
2
3
4
5
6
7
→ Replace the PCB.
Actual rotating pulse output (0-15V)
Rotation command pulse input (0-15V)
15V
320VDC
SiUS12-928_A
Service Diagnosis