Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 820

Resolución de averías
10-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Outdoor pipe> (TH3)
• Thermistor <Outdoor 2-phase pipe> (TH6)
Thermistor R0 = 15k' ± 3%
B constant = 3480 ± 2%
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
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
60 °C 48k 110
820
1
4.3k
3.0k
1
34k
24k
17.5k
°C 13.0k
°C 9.8k
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature (
500
400
300
200
100
0
50 75
25
Temperature (
°C
)
100 120
°C
)