Table 34 - Outdoor Air Sensor Temperature/Voltage / Correlation; Checking Inputs And Outputs - York YCAL0019 Installation, Operation And Maintenance Manual

FORM 150.67-NM1
ISSUE DATE: 4/28/2017

CHECKING INPUTS AND OUTPUTS

Digital Inputs
Refer to the unit wiring diagram. All digital inputs are
connected to J13-1 of the I/O board. The term "digital"
refers to two states – either ON or OFF. As an example,
when the flow switch is closed, 30VDC will be applied
to J13, pin 5 (J13-5) of the I/O board. If the flow switch
is open, 0VDC will then be present at J13-5.
Pin 1 of J13 is an unregulated 30VDC source used to
supply the DC voltage to the various user 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 respective 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, voltages of 24 to 36VDC could be measured
for the DC voltage on the digital inputs. This voltage is
in reference to ground. The unit case should be suffi-
cient 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 ana-
log inputs represent varying DC signals corresponding
to varying temperatures. All voltages are in reference
to the unit case (ground). Following are the connec-
tions for the temperature sensing inputs:
Outside Air Sensor
J6-6 = +5VDC regulated supply to sensor.
J6-9 = VDC input signal to the microboard.
See Table 34 for voltage readings that correspond to
specific outdoor temperatures.
J6-3 = drain (shield connection = 0VDC) Return
JOHNSON CONTROLS
SECTION 9 – SERVICE AND TROUBLESHOOTING
TABLE 34 - OUTDOOR AIR SENSOR TEMPERA-
TURE/VOLTAGE / CORRELATION
VOLTAGE
TEMP °F (SIGNAL INPUT
TO RETURN)
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
TEMP °C
-18
-15
-12
-9
-7
-4
-1
2
4
7
10
13
16
18
21
24
27
29
32
35
38
41
43
46
49
52
54
9
207