How To Check The Parts; Thermistor Characteristic Graph - Mitsubishi Electric Mr.Slim PKA Series Service Manual

9-6. HOW TO CHECK THE PARTS

Parts name
Room temperature
thermistor (TH1)
Pipe temperature
thermistor/liquid(TH2)
Condenser/evaporator
temperature thermistor (TH5)
Vane motor (MV)
Sky Blue
7
M
9 Sky Blue
Red
10
Sky Sky
Blue Blue
Connector(CNV)
6 8
pin No.
Vane motor (Lower MV2)
2 Sky Blue
M
4 Sky Blue
Red
5
Sky Sky
Blue Blue
Connector(CNV)
1 3
pin No.
Fan motor (MF)
9-6-1. Thermistor
<Thermistor Characteristic Graph>
Thermistors for
lower temperature
R : Thermistor resistance
t
t: Temperature
Thermistor R =15k" ± 3%
0
Fixed number of B=3480 ± 1%
{ (
R = R exp B
t 0
273 + t
t Rt
0: 15 k"
10: 9.6 k"
20: 6.3 k"
25: 5.4 k"
30: 4.3 k"
40: 3.0 k"
OCH758
Disconnect the connector then measure the resistance with a multimeter.
Refer to "9-6-1. Thermistor".
Measure the resistance between the terminals with a multimeter . (At the ambient temperature 25°C)
0-9 0-8
Red-Sky Blue Red-Sky Blue
300
Measure the resistance between the terminals with a multimeter. (At the ambient temperature 25°C)
5-4 5-3
Red-Sky Blue Red-Sky Blue
300 ± 26.3
Refer to "9-6-2. DC Fan motor (fan motor/indoor controller circuit board)".
Room temperature thermistor (TH1)
Pipe temperature thermistor/liquid (TH2)
Condenser/evaporator temperature ther-
mistor (TH5)
1 1
)}
-
273
Checkpoints
Normal
0-7 0-6
Red-Sky Blue Red-Sky Blue
"
± 7%
Normal
5-2 5-1
Red-Sky Blue Red-Sky Blue
"
25
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature (:)