Trouble Criterion Of Main Parts - Mitsubishi Electric Mr.SLIM PEAD-A24AA Service Manual

10-6. TROUBLE CRITERION OF MAIN PARTS

PEAD-A24AA
PEAD-A30AA
PEAD-A36AA
PEAD-A42AA
Part name
Room temperature
thermistor
(TH1)
Pipe temperature
thermistor/liquid
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Wiring diagram
10-7. Thermistor
<Thermistor Characteristic graph>
Room temperature thermistor (TH1)
Thermistor for
Pipe temperature thermistor (TH2)
lower temperature
Condenser/evaporator temperature
thermistor (TH5)
Thermistor R =15k" ± 3%
0
Fixed number of B=3480k" ± 2%
1
Rt=15exp { 3480(
273+t
0°C (32°F) 15k"
10°C (50°F) 9.6k"
20°C (68°F) 6.3k"
25°C (77°F) 5.2k"
30°C (86°F) 4.3k"
40°C (104°F) 3.0k"
Check method and criterion
Measure the resistance with a tester.
(Part temperature 10°C (50°F) ~ 30°C (86°F))
Normal
4.3kΩ~9.6kΩ
Vm (Power supply for motor)
Vcc (Power supply for control)
Regulator
Vsp (Speed command voltage)
PG (Pulse output for rotation)
GND
1
) }
273
Abnormal
Opened or short-circuited
Motor
Board with build-in motor
Hall IC
Power
device
Current detecting resistor
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0
-4 14 32 50 68 86 104 122
32
Motor winding
Pre
driver
(˚C)
10 20 30 40 50
˚F
Temperature