Mitsubishi Electric PCA-A24GA Service Manual page 23

<Thermistor Characteristic graph>
Thermistor for Room temperature thermistor(TH1)
lower temperature
Pipe temperature thermistor(TH2)
Condenser/evaporator temperature
thermistor(TH5)
Thermistor R =15kΩ ± 3%
0
Fixed number of B=3480 ± 2%
t(:):Rt=15exp { 3480(
T(˚F):Rt=15exp { 3480(
0: (32˚F)
10: (50˚F)
20: (68˚F)
25: (77˚F)
30: (86˚F)
40:(104˚F)
10-6.TEST POINT DIAGRAM
10-6-1. Power board
PCA-A24GA PCA-A30GA
PCA-A24GA PCA-A30GA
1
1
1
) }
273+t 273
1 1
) }
T-32
273+
273
1.8
15kΩ
9.6kΩ
6.3kΩ
5.4kΩ
4.3kΩ
3.0kΩ
PCA-A36GA
PCA-A36GA
1
< Thermistor for lower temperature >
50
40
30
20
10
0
PCA-A42GA
PCA-A42GA
1 1
CN2S
Connect to the indoor controller board (CN2D)
Between 1 to 3 12.6-13.7V DC (Pin1 (+))
CNSK
Connect to the indoor controller board
(CNDK)
Between 1 to 3 208/230V AC
23
-20 -10 0 10 20 30 40
-4 -14 32 50 68 86 104 122
Temperature
50
:
˚F