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JOHNSON CONTROLS
125
FORM 150.63-NM6 (1020)
CHECKING INPUTS AND OUTPUTS
DIGITAL INPUTS
Refer to the unit wiring diagram. All digital inputs are
connected to J9 of the microboard. The term “digital” re-
fers to two states – either on or off. As an example, when
the flow switch is closed, 30 volts
DC
will be applied to
J9, pin 5 (J9-5) of the microboard. If the flow switch is
open, 0 volts DC will then be present at J9-5.
Pin 1 of J9 is an
unregulated
30VDC that is the
DC
volt-
age
source
used to supply the DC voltage to the various
contacts, unit switch, flow switch, etc. This
DC source
is factory wired to CTB1, terminal 13. Any switch or
contact used as a digital input would be connected to
this terminal, with the other end connecting to its respec-
tive digital input on the microboard. Any time a switch
or contact is closed, 30VDC would be applied to that
particular digital input. Any time a switch or contact is
open, 0VDC would be applied to that particular digital
input.
Typically, as high as 34VDC could be measured for the
DC voltage on the digital inputs. This voltage is in ref-
erence to ground. The unit case should be sufficient as a
reference point when measuring digital input voltages.
ANALOG INPUTS – Temperature
Refer to the unit wiring diagram. Temperature inputs are
connected to the microboard on plug J6. These
analog
inputs represent varying DC signals corresponding to
varying temperatures. All voltages are in reference to
the unit case (ground). Following are the connections
for the temperature sensing inputs:
Outside Air Sensor
J6-4 = +5VDC
regulated supply to sensor.
J6-7 =
VDC
input signal to the microboard. See Table
45 for voltage readings that correspond to
specific outdoor temperatures.
J6-1 = drain (shield connection = 0
VDC
)
TABLE 34 –
OUTDOOR AIR SENSOR
TEMPERATURE/VOLTAGE/
RESISTANCE CORRELATION
TEMP °F
VOLTAGE
RESISTANCE
TEMP C°
0
0.7
85398
-18
5
0.8
72950
-15
10
0.9
62495
-12
15
1.0
53685
-9
20
1.1
46240
-7
25
1.2
39929
-4
30
1.4
34565
-1
35
1.5
29998
2
40
1.7
26099
4
45
1.8
22673
7
50
2.0
19900
10
55
2.2
17453
13
60
2.3
15309
16
65
2.5
13472
18
70
2.6
11881
21
75
2.8
10501
24
80
2.9
9298
27
85
3.1
8250
29
90
3.2
7332
32
95
3.4
6530
35
100
3.5
5827
38
105
3.6
5209
41
110
3.7
4665
43
115
3.8
4184
46
120
3.9
3759
49
125
4.0
3382
52
130
4.1
3048
54
3
Summary of Contents for YCUL0045
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