Mitsubishi Electric PEA-RP200GA Service Manual page 26

9-5. HOW TO CHECK THE PARTS
PEA-RP200GA PEA-RP250GA
PEA-RP400GA PEA-RP500GA
Parts name
Room temperature
thermistor (TH1)
Pipe temperature
thermistor/liquid (TH2)
Condenser/evaporator
temperature thermistor
(TH5)
•PEA-RP200/250GA
Thermal protector trip temperature
135 ±5˚C : open
86 ±15˚C : close
Red
Yellow
U2
THERMO
Red
Yellow
Black marking
U1
(HI) W1 V1
Blue
Black marking
W2
(LO) Blue
•PEA-RP400/500GA
Thermal protector trip temperature
150 ±5˚C : open
96 ±15˚C : close
a b
THERMO
Z Y
W
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R =15k' ± 3%
0
Fixed number of B=3480 ± 2%
1
Rt=15exp { 3480(
273+t
0: 15k'
10: 9.6k'
20: 6.3k'
25: 5.2k'
30: 4.3k'
40: 3.0k'
Disconnect the connector then measure the resistance using a tester.
(Surrounding temperature 10:~30:)
Normal
4.3k"~9.6k"
Measure the resistance value across the terminals with a multimeter. (Winding
temperature 20 ˚C)
(LO)
PEA-RP
(HI)
200/250GA
PEA-RP
White (HI)
Black marking
400GA
V1
White (LO)
PEA-RP
500GA
U
X
V
•Room temperature thermistor(TH1)
•Pipe temperature thermistor/liquid(TH2)
•Condenser/Evaporator temperature
thermistor(TH5)
1
) }
273
Check points
Abnormal
Open or short
Normal
Hi Red-White / White-Blue / Red-Blue
Lo Red-White / White-Blue / Red-Blue
Red-White / White-Blue / Red-Blue
Red-White / White-Blue / Red-Blue
50
40
30
20
10
0
26
(Refer to the thermistor)
Abnormal
20.6Ω
25.6Ω
34.2Ω
Open or short
25.2Ω
< Thermistor for lower temperature >
-20 -10 0 10 20 30 40 50
Temperature (:)