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Trouble Criterion Of Main Parts - Mitsubishi Electric Mr.Slim PEAD-RP35JALQ Service Manual

Series pead, ceiling concealed r410, 2010 split-type, heat pump air conditioners.
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9-6. TROUBLE CRITERION OF MAIN PARTS

Part name
Room temperature
thermistor
(TH1)
Pipe temperature
thermistor/liquid
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Wiring diagram
9-7. Thermistor
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R
=15k" ± 3%
0
Fixed number of B=3480k" ± 2%
Rt=15exp { 3480(
273+t
0:
15k"
10:
9.6k"
20:
6.3k"
25:
5.2k"
30:
4.3k"
40:
3.0k"
Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)
Normal
4.3kΩ~9.6kΩ
Vm (Power supply for motor)
Vcc (Power supply for control)
Vsp (Speed command voltage)
PG (Pulse output for rotation)
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature
thermistor (TH5)
1
1
) }
273
Check method and criterion
Abnormal
Opened or short-circuited
Board with build-in motor
Regulator
Hall IC
GND
37
Motor
Motor winding
Power
Pre
device
driver
Current detecting resistor
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0
10 20 30 40 50
Temperature (:)

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