YORK INTERNATIONAL
113
FORM 150.62-NM7 (103)
CHECKING INPUTS AND OUTPUTS
DIGITAL INPUTS
Refer to the unit wiring diagram. All digital in puts are con-
nect ed to J9 of the microboard. The term “digital” re fers
to two states – either on or off. As an ex am ple, when
the fl ow switch is closed, 30 volts DC will be ap plied to
J9, pin 5 (J9-5) of the microboard. If the fl ow 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
var i ous con tacts, unit switch, fl ow switch, etc. This DC
source is factory wired to CTB1, terminal 13. Any switch
or con tact used as a digital input would be con nect ed
to this ter mi nal, with the other end connecting to its
respective digital input on the microboard. Any time a
switch or con tact is closed, 30VDC would be applied to
that particular digital input. Any time a switch or con tact
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 volt age is in ref-
er ence to ground. The unit case should be suffi cient as a
ref er ence point when measuring digital input volt ag es.
ANALOG INPUTS – Temperature
Refer to the unit wiring diagram. Tem per a ture inputs are
connected to the microboard on plug J6. These analog
inputs represent varying DC signals cor re spond ing to
vary ing temperatures. All volt ag es are in ref er ence to
the unit case (ground). Fol low ing are the con nec tions
for the tem per a ture 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 read ings that
cor re spond to specifi c out door temperatures.
J6-1 = drain (shield connection = 0VDC)
TABLE 36 – OUTDOOR AIR SENSOR
TEMPERATURE/VOLTAGE/
RESISTANCE COR RE LA TION
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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