Honeywell Stud Sensor C7189A User Manual

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
69-08951  
 
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  
69-08951 J.H. Rev. 5-95 Printed in Mexico  
 

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