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YORK INTERNATIONAL
99
FORM 150.62-NM1
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
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 con-
tact used as a binary input would be connected to this
terminal, with the other end connecting to it’s respective
binary input on the microboard. Anytime a switch or con-
tact is closed, 30VDC would be applied to that particular
binary input. Anytime a switch or contact is open, 0VDC
would be applied to that particular binary input.
Typically, as high as 34VDC 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 = +5VDC regulated supply to sensor.
J6-7 = VDC input signal to the microboard. See Table
47 for voltage readings that correspond to
specific outdoor temperatures.
J6-1 = drain (shield connection = 0VDC)
TABLE 47 – 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
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