Mitsubishi Electric PUZ-HWM140VHA, Руководство по обслуживанию

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36
OCH748
9-6. HOW TO CHECK THE COMPONENTS
9-6-1. Thermistor feature chart
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <2-phase pipe> (TH6)
• Thermistor <Ambient> (TH7)
• Thermistor <Suction> (TH32)
• Thermistor <Plate Hex liquid> (TH34)
Thermistor R0 = 15 k
"
± 3%
B constant = 3480 ± 2%
R
t
=15exp{3480( 273+t – 273 )}
1
Thermistor R50 = 17 k
"
± 2%
B constant = 4150 ± 3%
R
t
=17exp{4150( 273+t – 323)}
1
Thermistor R120 = 7.465k
"
± 2%
B constant = 4057 ± 2%
R
t
=7.465exp{4057( 273+t – 393)}
1
1
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
High temperature thermistors
• Thermistor <Discharge> (TH4)
• Thermistor <Comp. surface> (TH33)
0
10
20
30
40
50
-20 -10 0 10 20 30 40 50
Temperature (°C)
Resistance (k
"
)
200
150
100
50
0
25 50 75 100 125
Temperature (°C)
Resistance (k
"
)
500
400
300
200
100
0
25
50 75 100 120
Temperature (°C)
Resistance (k
"
)
1
1
0
°C
15 kΩ
10
°C
9.6 kΩ
20
°C
6.3 kΩ
25
°C
5.2 kΩ
30
°C
4.3 kΩ
40
°C
3.0 kΩ
0
°C
180 kΩ
25
°C
50 kΩ
50
°C
17 kΩ
70
°C
8 kΩ
90
°C
4 kΩ
20
°C
250 kΩ
30
°C
160 kΩ
40
°C
104 kΩ
50
°C
70 kΩ
60
°C
48 kΩ
70
°C
34 kΩ
80
°C
24 kΩ
90
°C
17.5 kΩ
100
°C
13.0 kΩ
110
°C
9.8 kΩ