Outdoor Air Sensor Temp./Volt./Resistance - York YCUL0045 Installation Operation & Maintenance

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 = 0VDC)
JOHNSON CONTROLS
TABLE 34 – 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 150.63-NM6 (1020)
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
125
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