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(5) Temperatures and thermistor resistance table
Resistance
Temperature
value
( kΩ )
(°F) (°C)
-22
-30 53.9 -
-4.0
-20
32.8
-2.2
-19
31.2
-0.4
-18
29.8
1.4
-17
28.4
3.2
-16
27.1
5.0
-15
25.8
6.8
-14
24.7
8.6
-13
23.6
10.4 -12
22.5
12.2 -11
21.5
14.0 -10
20.6
15.8
-9
19.7
17.6
-8
18.8
* Measure the indoor air (RA) thermistor resistance across pin No. 1 and 2 of CN5, and the outdoor air (OA)
thermistor resistance across pin No. 1 and 2 of CN22.
(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.
<LGH-F300RVX-E>
Lead color
Normal resistance
<LGH-F470RVX-E, LGH-F600RVX-E, LGH-F1200RVX-E>
Lead color
Normal resistance
Resistance
Temperature
Temperature
value
( kΩ )
(°F) (°C)
19.4
-7
18.0
21.2
-6
17.2
23.0
-5
16.5
24.8
-4
15.7
26.6
-3
15.1
28.4
-2
14.5
30.2
-1
13.8
32.0
0
13.3
33.8
1
12.8
35.6
2
12.2
37.4
3
11.7
39.2
4
11.2
41.0
5
10.7
42.8
6
10.3
44.6
7
10.0
Black-Red
About 815 kΩ
Black-Red
∞ kΩ
Resistance
Temperature
value
( kΩ )
(°F) (°C)
46.4
8
9.5
73.4
48.2
9
9.2
75.2
50.0
10
8.8
77.0
51.8
11
8.5
78.8
53.6
12
8.1
80.6
55.4
13
7.8
82.4
57.2
14
7.6
84.2
59.0
15
7.3
86.0
60.8
16
7.0
87.8
62.6
17
6.7
89.6
64.4
18
6.5
91.4
66.2
19
6.3
93.2
68.0
20
6.0
95.0
69.8
21
5.8
96.8
71.6
22
5.6
98.6
Black-White
Black-Yellow
About 40 kΩ
About 105 kΩ
Black-White
Black-Yellow
About 50 kΩ
About 150 kΩ
─ 36 ─
Resistance
Temperature
value
( kΩ )
(°F) (°C)
(°F) (°C)
23
5.4
100.4 38
24
5.1
102.2 39
25
5.0
104.0 40
26
4.8
105.8 41
27
4.7
107.6 42
28
4.5
109.4 43
29
4.3
111.2
30
4.2
113.0 45
31
4.0
114.8 46
32
3.9
116.6 47
33
3.7
118.4 48
34
3.6
120.2 49
35
3.5
122.0 50
36
3.4
37
3.2
194
Black-Blue
∞ kΩ
Black-Blue
∞ kΩ
Resistance
value
( kΩ )
3.1
3.1
3.0
2.8
2.7
2.7
44
2.6
2.5
2.4
2.3
2.2
2.2
2.1
90
0 - 0.7
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