Mitsubishi Electric EHGT17D-YM9ED Service Manual page 60

<Thermistor Characteristics Charts>
Low temperature thermistors
• Room temperature thermistor (TH1)
• Liquid refrigerant temperature thermistor (TH2)
• Liquid thermistor (TH3)
• Ambient thermistor (TH7)
• Flow water temperature thermistor (THW1)
• Return water temperature thermistor (THW2)
• DHW tank temperature thermistor (THW5A/B)
• Zone1 flow water temperature thermistor (THW6)
• Zone1 return water temperature thermistor (THW7)
• Zone2 flow water temperature thermistor (THW8)
• Zone2 return water temperature thermistor (THW9)
• Brine inlet thermistor (TH32)
• Brine outlet thermistor (TH34)
Thermistor R0 = 15kΩ ± 3%
B constant = 3480 ± 1%
1 1
Rt = 15exp {3480 ( 273+t – 273 )}
Medium temperature thermistor
• Thermistor <Heat sink> (TH8)
Thermistor R50 = 17 k" ± 2 %
B constant = 4150 ± 3 %
1 1
Rt =17exp{4150( 273+t – 323 )}
0 : 180 k"
25 : 50 k"
50 : 17 k"
70 : 8 k"
90 : 4 k"
High temperature thermistor
• Discharge thermistor (TH4)
• Comp. surface thermistor (TH33)
Thermistor R120 = 7.465 k" ± 2 %
B constant = 4057 ± 2 %
1
1
Rt =7.465exp{4057( 273+t – 393 )}
20 : 250 k"
70 :
30 : 160 k"
80 :
40 : 104 k"
90 :
50 : 70 k"
100 :
60 : 48 k"
110 :
• Boiler flow water temperature thermistor (THWB1)
• Mixing tank water temperature thermistor (THW10)
Thermistor R100 = 3.3kΩ ± 2%
B constant = 3970 ± 1%
1 1
Rt = 3.3exp {3970 ( 273+t – 273 )}
0°C 162.8 kΩ
10°C 97.4 kΩ
20°C 60.3 kΩ
25°C 48.1 kΩ
30°C 38.6 kΩ
40°C 25.4 kΩ
50°C 17.1 kΩ
60°C 11.9 kΩ
70°C 8.4 kΩ
80°C 6.0 kΩ
OCH722A
0°C 15 kΩ
10°C 9.6 kΩ
20°C 6.3 kΩ
25°C 5.2 kΩ
30°C 4.3 kΩ
40°C 3.0 kΩ
34 k"
24 k"
17.5 k"
13.0 k"
9.8 k"
50
40
30
20
10
0
-20 -10 0 10
Temperature (:)
200
150
100
50
0
25 50
Temperature (:)
500
400
300
200
100
0
50
25
Temperature (:)
1000
900
800
700
600
500
400
300
200
100
0
-30 -20 -10 0 10 20
Temperature (°C)
60
20 30 40 50
75 100 125
75 100 120
30 40 50 60 70 80