Reference Data - Mitsubishi Electric PRH-P8MYA Technical & Service Manual

[6] Reference Data

<Thermistor characteristic table>
Low temperature thermistor
Thermistor <Liquid temperature detection> (TH1, 5)
Thermistor <Condenser/evaporater temperature detection> (TH3, 6)
Thermistor <Indoor-side intake temperature (TH4)
Thermistor Ro = 15 kΩ ± 3 %
B constant = 3,460 kΩ ± 2 %
Rt = 15 exp {3,460 (–––––– – ––––)}
0 °C: 15 kΩ
10 °C: 9.7 kΩ
20 °C: 6.4 kΩ
25 °C: 5.3 kΩ
30 °C: 4.3 kΩ
40 °C: 3.1 kΩ
High temperature thermistor
Thermistor (Discharge temperature detection) (TH2)
Thermistor R120 = 7.465 kΩ ± 2 %
B constant = 4,057 kΩ ± 2 %
Rt = 7.465 exp {4,057 (–––––– – ––––)}
20 °C: 250 kΩ
30 °C: 160 kΩ
40 °C: 104 kΩ
50 °C: 70 kΩ
60 °C: 48 kΩ
1 1
273 + t 273
Thermistor <Discharge temperature detection> (TH2)
1 1
273 + t 393
70 °C:
34 kΩ
80 °C:
24 kΩ
90 °C: 17.5 kΩ
100 °C: 13.0 kΩ
110 °C: 9.8 kΩ
- 54 -
<Low temperature thermistor>
50
40
30
20
10
0
-20 -10 0 10 20
Temperature
<High temperature thermistor>
25
20
15
10
5
0
90 100
Temperature
30 40 50 60
110 120