JOHNSON CONTROLS
146
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
SECTION 9 – SERVICE AND TROUBLESHOOTING
Discharge Air Temperature Sensor
J6-5 =
+5 VDC regulated supply to sensor.
J6-8 =
vdc input signal to the microboard.
See
for voltage
readings that correspond to specific
discharge temperatures.
J6-2 =
drain (shield connection = 0 VDC)
Analog Inputs – Pressure
Refer to the unit wiring diagram. Pressure inputs are
connected to the microboard on plugs J7 and J9. These
analog inputs represent varying dc signals correspond-
ing to varying pressures. All voltages are in reference
to the unit case (ground).
System 1 discharge and suction pressures will be con-
nected to J7 of the microboard. System 2 discharge and
suction pressure transducers will be connected to J9 of
the microboard.
The discharge transducers are optional on all units. If
the discharge transducers are not installed, no connec-
tions are made to the microboard and the discharge
pressure readout on the display would be zero.
The suction pressure transducers are standard on all
YLUA’s. The suction pressure transducers have a range
of 0 psig to 400 psig. The output will be linear from 0.5
VDC to 4.5 VDC over the 400 psig (27.5 barg) range.
The discharge transducers have a range from 0 psig to
650 psig. The output will be linear from 0.5 VDC to 4.5
VDC over the 650 psig (41.25 barg) range. Following
is the formula that can be used to verify the voltage
output of the transducer. All voltage reading are in ref-
erence to ground (unit case).
TABLE 36 -
DISCHARGE AIR TEMPERATURE
SENSOR TEMPERATURE/VOLTAGE/RESISTANCE
CORRELATION
TEMP °F VOLTAGE RESISTANCE
TEMP °C
0
1.71
25619
-18
2
1.78
24046
-17
4
1.85
22580
-16
6
1.93
21214
-14
8
2.00
19939
-13
10
2.07
18749
-12
12
2.15
17637
-11
14
2.22
16599
-10
16
2.30
15629
-9
18
2.37
14721
-8
20
2.45
13872
-7
22
2.52
13077
-6
24
2.59
12333
-4
26
2.67
11636
-3
28
2.74
10982
-2
30
2.81
10370
-1
32
2.88
9795
0
34
2.95
9256
1
36
3.02
8750
2
38
3.08
8276
3
40
3.15
7830
4
42
3.21
7411
6
44
3.27
7017
7
46
3.33
6647
8
48
3.39
6298
9
50
3.45
5970
10
52
3.51
5661
11
54
3.56
5370
12
56
3.61
5096
13
58
3.67
4837
14
60
3.72
4593
16
62
3.76
4363
17
64
3.81
4145
18
66
3.86
3941
19
68
3.90
3747
20
70
3.94
3564
21
72
3.98
3392
22
74
4.02
3228
23
76
4.06
3074
24
78
4.10
2928
26
80
4.13
2790
27
Summary of Contents for YLUA0078
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