Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 811

10-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Outdoor 2-phase pipe> (TH6)
• Thermistor <Outdoor> (TH7)
Thermistor R0 = 15k ± 3%
B constant = 3480 ± 2%
1 1
=15exp{3480( 273+t – 273 )}
R
t
0 °C 15k 30 °C
10 °C 9.6k 40 °C
20 °C 6.3k
25 °C 5.2k
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
Thermistor R50 = 17k ± 2%
B constant = 4150 ± 3%
1 1
=17exp{4150( 273+t – 323 )}
R
t
0 °C 180k
25 °C 50k
50 °C 17k
70 °C 8k
90 °C 4k
High temperature thermistor
• Thermistor <Discharge> (TH4)
Thermistor R120 = 7.465k ± 2%
B constant = 4057 ± 2%
1
=7.465exp{4057( 273+t – 393 )}
R
t
20 °C 250k 70 °C
30 °C 160k 80 °C
40 °C 104k 90 °C
50 °C 70k 100 °C
60 °C 48k 110 °C
4.3k
3.0k
1
34k
24k
17.5k
13.0k
9.8k
Resolución de averías
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature (: )
200
150
100
50
0
25 50 75
Temperature (: )
500
400
300
200
100
0
50 75
25
Temperature (: )
100 125
100 120
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