Daikin SUPER MULTI NX G Series Service Manual page 165

SiUS12-928_A
6.1.10 Capacitor Voltage Check
Check No.12
Before this check, be sure to check the main circuit for short circuit.
With the circuit breaker still on, measure the voltage according to the drawing of the model in
question. Be careful never to touch any live parts.
18 class
24/32 class
6.1.11 Power Transistor Check
 Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
Check No.13
 If unavoidably necessary to touch a live part, make sure the power transistor's supply voltage is
 For the UVW, make measurements at the terminal on the PCB or the relay connector.
Tester's negative terminal
Tester's positive terminal
Normal resistance
Abnormal resistance
Service Diagnosis
Multimeter
(DC. voltage range)
Fan motor
lead wire
Multimeter
(DC. voltage range)
Fan motor lead
below 50 V using the tester.
Power transistor
Compressor Reactor
lead wire lead wire
S40
S90 S92 S93
S20 S21 S22
(Room-A) (Room-B) (Room-C)
Electronic expansion valve coil lead wire
Reactor lead wire Compressor lead wire
(Room-A) (Room-B) (Room-C)
Electronic expansion valve coil lead wire
UVW
(+)
Power transistor
UVW
(+)
Several kΩ to several MΩ
Overload
protector
lead wire
Thermistor
lead wire
Thermistor
lead wire
(Gas pipe)
Thermistor
S80
lead wire
(Liquid pipe)
Four way valve coil
lead wire
Overload protector lead wire
Thermistor lead wire
Thermistor lead wire
(Gas pipe)
Thermistor lead wire
(Liquid pipe)
Four way valve coil lead wire
(Room-D)
Power transistor
(–)
Power transistor
UVW
0 or ∞
Check
(R11308)
(R11230)
UVW
(–)
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