C7189A
Wall Mount Temperature Sensor
INSTALLATION INSTRUCTIONS
3 Installer must be a trained, experienced service
technician.
4 After installation is complete, check out product
operation as provided in these instructions.
APPLICATION
The C7189 Wall Mount Temperature Sensor provides the
input required by the PC8900 Perfect Climate® Comfort
Center with the W8900 Remote Module to sense tempera-
ture in indoor air spaces.
CAUTION
Disconnect power supply before connecting wiring
to prevent electrical shock or equipment damage.
SPECIFICATIONS
Operating Ambient Temperature Range:
40 to 95°F (4.4°C to 35°C)
Location and Mounting
Locate the C7189 Wall Mount Temperature Sensor where
the setting will not be subjected to tampering.
Humidity Setting Range:
1 Choose a location for the sensor on an inside wall
about 5 ft (1.5 m) above the floor. A horizontally
mounted standard 2 x 4 in. (51 x 102 mm) junction
box can also be used at the selected location for the
C7189.
None
Operating Relative Humidity:
5% to 95% noncondensing
2 Be sure that the wire distance between the C7189
and the W8900 does not exceed 200 feet.
3 Make sure that there is good air circulation at
average temperature at the chosen location. Avoid
the following locations because they can introduce
errors in sensor measurements. See Fig. 1:
Hot areas caused by:
Finish:
White
Dimensions in Inches (millimeters):
2 3/4 (70) width x 4 5/8 (117) height x 1 1/16 (27) depth
Accessories:
202689A Mounting Plate Assembly used to cover marks
left on the wall by the old thermostat
• Concealed pipes or ducts.
• Drafts from fireplaces or other heat sources.
• Convection or radiant heat from the sun or
electrical equipment.
INSTALLATION
Cold areas caused by:
• Concealed pipes or ducts.
• Drafts from windows and doors.
• Unheated areas on the other side of the wall
location.
Dead air areas:
• Behind doors, furniture and curtains.
• In corners and alcoves.
When Installing this Product...
1
2
Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
4 Mark the area on the wall where the C7189 Sensor
or junction box will be mounted.
®U.S. Registered Trademark
Copyright © 1995 Honeywell Inc. •
•
All Rights Reserved
69-0895-1
C7189A WALL MOUNT TEMPERATURE SENSOR
W8900
2
3
S1
S
C7189
LED
GND
C
R
RH
RC
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
IF MORE THAN ONE C7189 REMOTE SENSOR IS REQUIRED, REFER TO FIGURE BELOW.
IF SHIELDED CABLE IS REQUIRED, GROUND TO GND TERMINAL ON W8900.
W8900
1
2
3
W8900
4
S1
S
S1
S
C7189
C7189
C7189
C7189
C7189
C7189
C7189
C7189
C7189
C7189
C7189
C7189
C7189
4
4
SENSORS MUST BE ARRANGED IN THIS NUMBER AND CONFIGURATION FOR PROPER OPERATION.
M4456
Fig. 2. Wiring Diagram for the C7189 Sensor to the W8900 Remote Module.
as the temperature increases. Fig. 3 shows how sensor
resistance decreases by 19 ohms per degree Fahrenheit.
OPERATION
The C7189 Wall Mount Temperature Sensor converts
room temperature to a resistance that the controller can
interpret. The C7189 has a negative temperature coeffi-
cient (NTC), which means that the resistance decreases
The C7189 can be used to control as one remote sensor,
as a temperature averaging network with the PC8900, or
with multiple C7189 Sensors connected as shown in Fig. 2.
3
69-0895—1
C7189A WALL MOUNT TEMPERATURE SENSOR
CHECKOUT
CALIBRATION
Allow the C7189 Wall Mount Temperature Sensor to soak
in the air moving through the room for a minimum of five
minutes before taking a resistance measurement.
The C7189 Remote Sensor is calibrated at the factory and
cannot be recalibrated in the field.
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. Remove one wire
from one of the C7189 wiring terminals. Use an ohmmeter
to measure the resistance across the sensor. Then verify
sensor accuracy with the temperature/resistance curve of
Fig. 3.
2300
2200
2100
2000
ROOM TEMPERATURE
OHMS OF
RESISTANCE
°F
°C
7.8
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
2131 to 2094
2094 to 2057
2057 to 2019
2019 to 1982
1982 to 1945
1945 to 1908
1908 to 1871
1871 to 1833
1833 to 1796
1796 to 1759
1759 to 1722
1722 to 1685
1685 to 1647
1647 to 1610
1610 to 1573
1573 to 1536
1536 to 1499
1499 to 1461
1461 to 1424
1424 to 1387
1387 to 1350
1350 to 1313
1313 to 1275
1275 to 1238
1238 to 1201
1201 to 1164
1164 to 1127
1127 to 1089
8.9
10.0
11.1
12.2
13.3
14.4
15.6
16.7
17.8
18.9
20.0
21.1
22.2
23.3
24.4
25.6
26.7
27.8
28.9
30.0
31.1
32.2
33.3
34.4
35.6
36.7
37.8
1900
1
1800
1700
1600
1500
1400
1300
1200
1000
70
(21)
80
(27)
90
(32)
100
(38)
40
(4)
50
(10)
60
(16)
°F
(°C )
TEMPERATURE
1
RESISTANCE DECREASES 18.6 OHMS PER 1°F
CHANGE OR 33.4 OHMS PER 1°C CHANGE.
M6357
Fig. 3. C7189 Sensor Resistance vs. Temperature Performance Characteristics.
Home and Building Control
Honeywell Inc.
1985 Douglas Drive
Home and Building Control
Honeywell Limited-Honeywell Limitée
740 Ellesmere Road
Helping You Control Your World
Golden Valley, MN 55422
Scarborough, Ontario
M1P 2V9
QUALITY IS KEY
69-0895—1 J.H. Rev. 5-95 Printed in Mexico
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