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CHECKING INPUTS AND OUTPUTS
BINARY INPUTS
Refer to the unit wiring diagram. All binary inputs are
connected to J9 of the microboard. The term "binary"
refers to two states - either on or off. As an example,
when the flow switch is closed, 30 volts dc will be ap-
plied 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 30 vdc 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, teminal 13. Any switch or contact
used as a binary input would be connected to this termi-
nal, with the other end connecting to it's respective bi-
nary input on the microboard. Anytime a switch or con-
tact is closed, 30 vdc would be applied to that particular
binary input. Anytime a switch or contact is open, 0 vdc
would be applied to that particular binary input.
Typically, as high as 34 vdc could be measured for the
dc voltage on the binary inputs. This voltage is in refer-
ence to ground. The unit case should be sufficient as a
reference point when measuring binary 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 = +5 VDC regulated supply to sensor.
J6-7 = VDC input signal to the microboard. See Table
44 for voltage readings that correspond to
specific outdoor temperatures.
J6-1 = drain (shield connection = 0 VDC)
YORK INTERNATIONAL
TABLE 44 – OUTDOOR AIR SENSOR
TEMPERATURE/VOLTAGE/
RESISTANCE CORRELATION
TEMP °F
VOLTAGE
0
0.7
5
0.8
10
0.9
15
1.0
20
1.1
25
1.2
30
1.4
35
1.5
40
1.7
45
1.8
50
2.0
55
2.2
60
2.3
65
2.5
70
2.6
75
2.8
80
2.9
85
3.1
90
3.2
95
3.4
100
3.5
105
3.6
110
3.7
115
3.8
120
3.9
125
4.0
130
4.1
FORM 150.62-NM2
RESISTANCE
TEMP C°
85398
-18
72950
-15
62495
-12
53685
-9
46240
-7
39929
-4
34565
-1
29998
2
26099
4
22673
7
19900
10
17453
13
15309
16
13472
18
11881
21
10501
24
9298
27
8250
29
7332
32
6530
35
5827
38
5209
41
4665
43
4184
46
3759
49
3382
52
3048
54
93
3
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