Daikin F-Series Service Manual page 264

SiBE12-712C
5.1.14 Turning Speed Pulse Input on the Outdoor Unit PCB Check
Check No.15 <Propeller fan motor>
Make sure the voltage of 270±30V is being applied.
(1) Stop the operation first and then the power, and disconnect the connector S70.
(2) Make sure there is about DC 270 V between pins 4 and 7.
(3) With the system and the power still off, reconnect the connector S70.
(4) Make a turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at
If the fan motor protection fuse is blown out, the outdoor-unit fan may also be in trouble. Check
the fan too.
If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB.
If the pulse in Step (4) is not available, it means the Hall IC is defective. Replace the DC fan
motor.
If there are both the voltage (2) and the pulse (4), replace the PCB.
∗
5.1.15 Hall IC Check
Check No.16 1. Check the connector connection.
2. With the power ON, operation OFF, and the connector connected, check the following.
Failure of (1)
Failure of (2)
Both (1) and (2) result
Service Diagnosis
pins 1 and 4.
Propeller fan motor : S70
∗
Output voltage of about 5 V between pins 1 and 3.
∗
Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
faulty PCB
faulty Hall IC
Replace the PCB.
PCB
S70
1 Turning speed pulse input (0-15 V)
2
3 15V
4
5
6
7
DC270V
Replace the PCB.
Replace the fan motor.
(R7044)
Check
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