23
7-6. TROUBLE CRITERION OF MAIN PARTS
PEA-A12AA4
PEA-A18AA4
Room temperature
thermistor
(TH1)
Condenser/evaporator
temperature thermistor
(TH5)
Measure the resistance with a tester.
(Part temperature 10
°
C(50
°
F) ~ 30
°
C(86
°
F))
Pipe temperature
thermistor/liquid
(TH2)
Wiring diagram
Check method and criterion
Part name
Normal
8k
Ω
~20k
Ω
Abnormal
Opened or short-circuited
Motor
Board with build-in motor
Current detecting resistor
Regulator
Hall IC
Motor winding
Power
device
Pre
driver
Vm (Power supply for motor)
Vcc (Power supply for control)
Vsp (Speed command voltage)
PG (Pulse output for rotation)
GND