Mitsubishi Electric Lossnay LGH-50RVS-E Handbook page 34

(5) Temperatures and thermistor resistance table
Temperature Resistance
(°C) value (kΩ)
-30 64.2 to ∞
-20
37.2
-19
35.3
-18
33.5
-17
31.8
-16
30.2
-15
28.7
-14
27.3
-13
26.0
-12
24.7
-11
23.6
-10
22.4
-9
21.4
-8
20.4
* Measure the return air (RA) thermistor resistance across pin No. 1 and 2 of CN5, and the outdoor air (OA)
thermistor resistance across pin No. 1 and 3 of CN7.
(6) Motor resistance table
Cautions:
• Before disconnecting the motor connectors, make sure that the power is turned OFF and the circuit board is
discharged adequately.
• Even after the power supply is cut off, the capacitor is charged. Therefore, high voltage is applied to the
motor for a while. Make sure that the LEDs on the circuit board are turned OFF before starting work.
• Never touch the circuit board while the power is ON. It causes electric shock and failure of the unit.
Replace the fan motor in the following cases.
[1] If it is hard to rotate the motor shaft by hand
[2] If the resistance between the motor leads is significantly different from the values specified in the table below
*Before measuring the resistance, the motor connectors must be disconnected from the circuit board.
Lead color
Normal resistance
Temperature Resistance Temperature
(°C) value (kΩ)
-7
19.4
-6
18.5
-5
17.7
-4
16.9
-3
16.1
-2
15.4
-1
14.7
0
14.0
1
13.4
2
12.8
3
12.3
4
11.8
5
11.3
6
10.8
7
10.3
Black-Red
∞ kΩ
Resistance Temperature
(°C) value (kΩ) (°C)
8 23
9.9
9 24
9.5
10 25
9.1
11 26
8.7
12 27
8.4
13 28
8.0
14 29
7.7
15 30
7.4
16 31
7.1
17 32
6.8
18 33
6.6
19 34
6.3
20 35
6.1
21 36
5.8
22 37
5.6
Black-White Black-Yellow
About 50 kΩ About 150 kΩ
─ 34 ─
Resistance Temperature Resistance
value (kΩ) (°C)
38
5.4
39
5.2
40
5.0
41
4.8
42
4.6
43
4.5
44
4.3
45
4.2
46
4.0
47
3.9
48
3.7
49
3.6
50
3.5
3.3
90
3.2
Black-Blue
∞ kΩ
value (kΩ)
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.5
2.4
2.3
2.2
2.2
2.1
0 to 0.7