How To Check The Components; Low Temperature Thermistors; High Temperature Thermistor - Mitsubishi Electric PUHZ-RP250YHA2 Service Manual

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
=15exp{3480( 273+t – 273 )}
R
t
0 15k 30
10 9.6k 40
20 6.3k
25 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 250k 70
30 160k 80
40 104k 90
50 70k 100
60 48k 110
1
4.3k
3.0k
1
34k
24k
17.5k
13.0k
9.8k
50
40
30
20
10
0
-20 -10 0
Temperature ( )
500
400
300
200
100
0
25
Temperature ( )
50
10 20 30 40 50
50 75 100 120