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SiUS091133 Check

Service Diagnosis 148

5.9 Rotation Pulse Check on the Outdoor Unit PCB

Check No.16 09/12 class

1. Check that the voltage between the pins 10 - 11 is 15 VDC.

2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 -12,

10 - 13, when the fan motor is manually rotated once.

15/18/24/30/36 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 ~ 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

1 turn by hand.

When the fuse is melted, check the outdoor fan motor for proper function.

If NG in step 2  Defective PCB  Replace the outdoor unit PCB.

If NG in step 4  Defective Hall IC  Replace the outdoor fan motor.

If OK in both steps 2 and 4  Replace the outdoor unit PCB.

S70

Phase U

15 VDC

Phase V

Phase W

HU (Hall IC)

HV (Hall IC)

Free pin

(R11907)

320 VDC

(R10811)

S70

PCB

Actual rotation pulse output (0 ~ 15VDC)

Rotation command pulse input (0 ~ 15VDC)

15 VDC

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