Mitsubishi Electric PUHZ-ZRP100VKA3 Service Manual page 59

10-7. HOW TO CHECK THE COMPONENTS
<Thermistor feature chart>
Low temperature thermistors
• Thermistor <Liquid> (TH3)
• Thermistor <2-phase pipe> (TH6)
• Thermistor <Ambient> (TH7)
Thermistor R0 = 15 k" ± 3%
B constant = 3480 ± 2%
1
R =15exp{3480(
–
t
273+t
0: 15 k"
30:
10: 9.6 k"
40:
20: 6.3 k"
25: 5.2 k"
Medium temperature thermistor
• Thermistor <Heat sink> (TH8) (ZRP100–250Y only)
Thermistor R50 = 17 k" ± 2%
B constant = 4150 ± 3%
1
=17exp{4150( 273+t – 323 )}
R
t
0: 180 k"
25: 50 k"
50: 17 k"
70: 8 k"
90: 4 k"
High temperature thermistor
• Thermistor <Discharge> (TH4) (ZRP100–140 only)
• Thermistor <Comp. Surface> (TH32) (ZRP200/250)
Thermistor R120 = 7.465 k" ± 2%
B constant = 4057 ± 2%
1
=7.465exp{4057( 273+t – 393 )}
R
t
20: 250 k" 70:
30: 160 k" 80:
40: 104 k" 90:
100:
50: 70 k"
110:
60: 48 k"
OCH645
1
)}
273
4.3 k"
3.0 k"
1
(TH33) (ZRP100–140)
1
34 k"
24 k"
17.5 k"
13.0 k"
9.8 k"
50
40
30
20
10
0
−20 −10 0 10 20 30 40 50
200
150
100
50
0
500
400
300
200
100
0
59
Temperature (:)
25 50 75 100 125
Temperature (:)
50 75 100
25
Temperature (:)
120