JOHNSON CONTROLS
148
FORM 150.66-NM2
ISSUE DATE: 09/25/2020
SECTION 9 - SERVICE AND TROUBlEShOOTING
Liquid & Refrigerant Sensor Test Points
(Table 29)
Entering Chilled liquid Sensor
J6-5 = +5 VDC regulated supply to sensor.
J6-8 = VDC input signal to the microboard.
See
Table 29 for voltage readings that corre
spond to specific liquid temperatures.
J6-2 = drain (shield connection = 0 VDC) Return.
leaving Chilled liquid Temperature Sensor
J6-4 = +5 VDC regulated supply to sensor.
J6-7 = VDC input signal to the microboard.
See
Table 29 for voltage readings that corre
spond to specific liquid temperatures.
J6-1 = drain (shield connection = 0 VDC) Return.
TABLE 29 – ENTERING/LEAVING CHILLED LIQUID TEMP. SENSOR, COOLER INLET TEMPERATURE
SENSOR, AND SUCTION TEMPERATURE SENSOR: TEMPERATURE/VOLTAGE CORRELATION
TEMP°F
VOlTAGE
(Signal Input
to Return)
TEMP°C
10
1.33
-12
12
1.39
-11
14
1.46
-10
16
1.51
-9
18
1.58
-8
20
1.65
-7
22
1.71
-6
24
1.78
-4
26
1.85
-3
28
1.91
-2
30
1.98
-1
32
2.05
0
34
2.12
1
36
2.19
2
38
2.26
3
40
2.33
4
42
2.40
6
44
2.47
7
46
2.53
8
48
2.60
9
50
2.65
10
52
2.73
11
54
2.80
12
56
2.86
13
58
2.92
14
60
2.98
16
TEMP°F
VOlTAGE
(Signal Input
to Return)
TEMP°C
62
3.05
17
64
3.11
18
66
3.17
19
68
3.23
20
70
3.29
21
72
3.34
22
74
3.39
23
76
3.45
24
78
3.5
26
80
3.54
27
Summary of Contents for YCAL0012EC
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