40
HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
Outdoor pipe <liquid> temperature thermistor (TH3)
Outdoor condenser/evaporator temperature thermistor (TH6)
Outdoor outside temperature thermistor (TH7)
Thermistor R0 = 15k
'
± 3%
B constant = 3480k
'
± 2%
R
t
=15exp{3480( 273+t
–
273 )}
0
:
15k
'
10
:
9.6k
'
20
:
6.3k
'
25
:
5.2k
'
0
:
180k
'
25
:
50k
'
50
:
17k
'
70
:
8k
'
90
:
4k
'
30
:
4.3k
'
40
:
3.0k
'
1
1
Thermistor R50 = 17k
'
± 2%
B constant = 4150k
'
± 3%
R
t
=17exp{4150( 273+t
–
323)}
1
1
Thermistor R120 = 7.465k
'
± 2%
B constant = 4057k
'
± 2%
R
t
=7.465exp{4057( 273+t
–
393)}
1
1
Medium temperature thermistor
Heat sink temperature thermistor (TH8)
20
:
250k
'
30
:
160k
'
40
:
104k
'
50
:
70k
'
60
:
48k
'
70
:
34k
'
80
:
24k
'
90
:
17.5k
'
100
:
13.0k
'
110
:
9.8k
'
High temperature thermistor
Discharge temperature thermistor (TH4)
0
10
20
30
40
50
-20 -10 0
10 20 30 40 50
Temperature (
:
)
Resistance (K
"
)
200
150
100
50
0
25
50
75
100
125
Temperature (
:
)
Resistance (K
"
)
500
400
300
200
100
0
25
50
75
100
120
Temperature (
:
)
Resistance (K
"
)
OC294--2.qxp 03.6.9 7:37 PM Page 40
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