Mitsubishi Electric EHST20C-VM6HA Service Manual page 54

<Thermistor Characteristics Charts>
• Room temperature thermistor (TH1)
• Liquid refrigerant temperature thermistor (TH2)
• Flow water temperature thermistor (THW1)
• Return water temperature thermistor (THW2)
• DHW tank temperature thermistor (THW5B)
Thermistor R0 = 15kΩ ± 3%
B constant = 3480 ± 2%
1 1
Rt = 15exp {3480 ( 73+t – 73 )}
0°C 15kΩ
10°C 9.6kΩ
20°C 6.3kΩ
25°C 5.2kΩ
30°C 4.3kΩ
40°C 3.0kΩ
• Booster heater temperature thermistor (THW3)
Thermistor R120 = 7.465kΩ ± 2%
B constant = 4057 ± 2%
1 1
Rt = 7.465exp {4057( 73+t – 393 )}
250kΩ
0°C 70°C
160kΩ
30°C 80°C
104kΩ
40°C 90°C
70kΩ
50°C 100°C
48kΩ
60°C 110°C
34kΩ
24kΩ
17.5kΩ
13.0kΩ
9.8kΩ
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature ( )
500
400
300
200
100
0
25
Temperature ( )
54
50 75 100 120