Mitsubishi Electric Mr. Slim PUZ-M200YKA2.UK Service Manual page 53

10-6. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <2-phase pipe> (TH6)
• Thermistor <Ambient> (TH7)
Thermistor R0 = 15 kΩ ± 3%
B constant = 3480 ± 1%
1
R =15exp{3480( –
t
273+t
0°C 15 kΩ
30°C
10°C 9.6 kΩ
40°C
20°C 6.3 kΩ
25°C 5.2 kΩ
Medium temperature thermistor
• Thermistor <Heat Sink> (TH8)
Thermistor R50 = 17 kΩ ± 2%
B constant = 4150 ± 3%
1
=17exp{4150( 273+t – 323 )}
R
t
0°C 180 kΩ
25°C 50 kΩ
50°C 17 kΩ
70°C 8 kΩ
90°C 4 kΩ
High temperature thermistors
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. Surface> (TH33)
Thermistor R120 = 7.465 kΩ ± 2%
B constant = 4057 ± 2%
1
=7.465exp{4057( 273+t – 393 )}
R
t
20°C 250 kΩ 70°C
30°C 160 kΩ 80°C
40°C 104 kΩ 90°C
50°C 70 kΩ 100°C 13.0 kΩ
60°C 48 kΩ 110°C
OCH775B
1
)}
273
4.3 kΩ
3.0 kΩ
1
1
34 kΩ
24 kΩ
17.5 kΩ
9.8 kΩ
50
40
30
20
10
0
−20 −10 0 10 20 30 40 50
200
150
100
50
0
500
400
300
200
100
0
53
Temperature (:)
25 50 75 100 125
Temperature (:)
50 75 100
25
Temperature (:)
120