VISIONPRO
®
IAQ TOTAL HOME COMFORT SYSTEM
35
68-0287—04
installed with Thermostat Installer Setup Number 340 set to 2,
the temperature displayed on the thermostat home screen as
Inside Temperature will be a 50/50 average between the
temperature sensed at the remote sensor location and the
temperature sensed at the thermostat location.
The C7189U1005 Wall Mount Temperature Sensor converts
room temperature to a resistance that the thermostat can
interpret.
The C7189U1005 has a negative temperature coefficient
(NTC), which means that resistance decreases as the
temperature increases. See Table 13.
The C7189U1005 can be used to provide one remote sensor
input (see Fig. 26) or as a temperature averaging network with
multiple C7189U1005 Sensors connected, as shown in Fig. 27.
Checkout
For best results, allow C7189U1005 Wall Mount Temperature
Sensor to absorb the air moving through the room for a
minimum of twenty minutes before taking a resistance
measurement.
With an accurate thermometer (±1°F [0.5°C]) measure the
temperature at the sensor location, allowing time for the
thermometer to stabilize before reading.
To verify sensor resistance, remove one wire from one of
C7189U1005 wiring terminals. Use an ohmmeter to measure
the resistance across the sensor. Then verify the sensor
accuracy with the temperature/resistance in Table 13.
Calibration
The C7189U1005 Wall Mount Temperature Sensor is
calibrated at the factory and cannot be recalibrated in the field.
COMMUNICATION ERROR CODES
VisionPRO
®
IAQ can alert the homeowner and installer to
problems with the HVAC equipment, thermostat, or equipment
interface module by using error codes. Please see Table 14 for
a list of error codes. When an error is active (the condition
causing the error is still present) it will be displayed in the time
field on the thermostat home screen. The home screen can
display up to 5 active errors. The time field will flash the time,
“Err,” and a list of up to 5 error codes, beginning with the most
critical, and repeat until the errors have been remedied.
A log of error codes can be viewed at the end of the installer
setup after the system tests. Active errors will be shown first.
The Error Log will log the last ten errors (active and inactive).
Pressing the reset button will clear all inactive errors from the
error log; active errors can not be cleared until the condition
has been remedied.
Table 13. Sensor Resistance at Room Temperature.
Room
Temperature
Ohms of
Resistance
Room
Temperature
Ohms of
Resistance
°F
°C
°F
°C
40
4.4
22537
72
22.2 11100
42
5.6
21516
74
23.3 10644
44
6.7
20546
76
24.4 10210
46
7.8
19626
78
25.6 9795
48
8.9
18754
80
26.7 9398
50
10.0 17926
82
27.8 9020
52
11.1
17136
84
28.9 8659
54
12.2 16387
86
30.0 8315
56
13.3 15675
88
31.1 7986
58
14.4 14999
90
32.2 7672
60
15.6 14356
92
33.3 7372
62
16.7 13743
94
34.4 7086
64
17.8 13161
96
35.6 6813
66
18.9 12607
98
36.7 6551
68
20.0 12081
100
37.8 6301
70
21.1 11578
—
Table 14. VisionPRO
®
IAQ Error Codes.
Error Code
Meaning
027
Faulty thermostat (must be replaced)
035
Duplicate thermostat zone detected
036
Duplicate UV timer
037
Duplicate filter timer
038
Duplicate humidifier pad timer
039
Duplicate indoor humidity sensor
040
Compressor should be running but it is not
050
Duplicate outdoor temperature sensor
052
Faulty post-coil air discharge sensor
053
Faulty outdoor temperature sensor
054
Faulty indoor humidity sensor
089
Heating/cooling equipment is missing
090
Data interface is continuously busy
091
Thermostat is not receiving data from other
equipment
118
Faulty discharge air temperature sensor
119
Faulty temperature sensor
121
Duplicate post-coil air discharge sensor
Table 13. Sensor Resistance at Room Temperature.
Room
Temperature
Ohms of
Resistance
Room
Temperature
Ohms of
Resistance
°F
°C
°F
°C
