Honeywell C7089 User Manual
C7089
Outdoor Sensor
(USE WITH TH8000 AND TH7000 THERMOSTATS)
INSTALLATION INSTRUCTIONS
APPLICATION
This C7089 Outdoor Sensor is used with theTH8000 and
TH7000 Thermostat families.
SPECIFICATIONS
Operating Ambient Temperature Range:
-40 to 120°F (-40 to 49°C).
Display Range:
-40 to 127°F (-40 to 53°C).
Sensor Accuracy:
+/-1.5°F at 70°F (+/-.84 at 21°C)
Operating Relative Humidity:
5% to 95% non-condensing.
Dimensions in in. (mm):
2-1/4 (57) x 3/8 (10) with 60 (1524) leadwires.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Location and Mounting (Fig. 1)
Mount the sensor where:
• cannot tamper with settings.
• there is good air circulation.
• it can measure true outdoor ambient temperature.
• surface is flat.
• wire distance between C7089 and thermostat is less
than 200 feet.
Do not mount the sensor:
• in direct sunlight.
• where hot or cold air blows on the sensor. Discharge
line from an outdoor compressor unit, vent or fan
causes inaccurate temperature readings.
• where snow, ice or debris can cover it.
Use the following steps to mount the sensor:
1. Remove the sensor from the mounting clip.
2. Mark the area on the location selected for
mounting the sensor mounting clip.
3. Mount the clip.
CAUTION
Electrical Shock Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power supply before connecting
wiring.
® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. • • All Rights Reserved 69-1709EFS
Fig. 1. Typical locations for outdoor sensor.
M7514
C7089 OUTDOOR SENSOR
Wiring
CAUTION
Electrical Interference (Noise) Hazard.
Can cause erratic system operation.
Keep wiring at least one foot away from large
inductive loads such as motors, line starters,
lighting ballasts and large power distribution
panels.
Use shielded cable to reduce interference when
rerouting is not possible.
IMPORTANT
Erratic temperature readings from a sensor can
occur as a result of any of the wiring practices
described below. Avoid these practices to
assure correct operation. Use shielded cable to
reduce interference if rerouting of sensor wiring
is not possible.
— Be sure wires have a cable separate from the
thermostat cable.
— Do not route temperature sensor wiring with
building power wiring, next to control contactors
or near light dimming circuits, electric motors or
welding equipment.
— Avoid poor wiring connections.
— Avoid intermittent or missing building earth
ground.
CAUTION
Electrical Shock Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power supply before connecting
wiring.
Wiring must comply with applicable codes, ordinances
and regulations:
1. Wire the C7089 Outdoor Sensor to S1 and S2
terminals on the thermostat. If leadwire provided
with C7089 is not long enough (60 in.), run a cable
to a hole at C7089 location.
a. Using color-coded, 18-gauge thermostat wire is
recommended. For example of general wiring
of C7089, see Fig. 2.
b. Pigtail wiring can be used.
2. Mount C7089 in its mounting clip.
3. Plug wiring hole using nonhardening caulk or putty.
1
C7089
1
USE APPROPRIATE MOUNTING MEANS FOR THE
TYPE OF STRUCTURE.
2
PLUG WIRING HOLE WITH NON-HARDENING CAULK
OR PUTTY.
WIRING HOLE
THROUGH
2
STRUCTURE
M19970
69-1709EFS 2
Fig. 2. Wiring C7089 Outdoor Sensor to thermostat.
OPERATION
On
MON
UE
THUSASUN
O
Se
o
C7089 OUTDOOR SENSOR
Once installed and the Thermostat Installer Setup
Number 0340 is set to 1 or 2, the outside temperature
can be displayed on the thermostat. See Fig. 3.
T
AUT
SYSTEM
HEAT
SCHED HOLD CLOCK SCREEN MORE
Fig. 3. Outside temperature reading on
TH8000 Series Thermostat.
t T
Heat
Following
Schedule
AM
Outside
M19971
The C7089 Outdoor Sensor converts outdoor ambient
temperature to a resistance that the thermostat can
interpret.
The C7089 has a negative temperature coefficient (TC), which
means that resistance decreases as
the temperature increases. See Table 1.
CHECKOUT
Allow C7089B Outdoor Sensor to absorb outdoor air for a
minimum of twenty minutes before taking a reading.
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
the C7089 60-in. leadwires. Use an ohmmeter to
measure the resistance across the sensor. Then verify
the sensor accuracy with the temperature/resistance in
Table 1.
CALIBRATION
The C7089 Outdoor Sensor is calibrated at the factory and cannot be recalibrated in the field.
Table 1. Sensor Resistance
at Outdoor Temperature .
Outdoor Temperature
-20 -28.9 106926
-18 -27.8 100923
-16 -26.7 95310
-14 -25.6 90058
-12 -24.4 85124
-10 -23.3 80485
-8 -22.2 76137
-6 -21.1 72060
-4 -20.0 68237
-2 -18.9 64631
0 -17.8 61246
2 -16.7 58066
4 -15.6 55077
6 -14.4 53358
8 -13.3 49598
Ohms of
Resistance°F °C
3 69-1709EFS
C7089 OUTDOOR SENSOR
Table 1. Sensor Resistance
at Outdoor Temperature (Continued).
Outdoor Temperature
Ohms of
Resistance°F °C
10 -12.2 47092
12 -11.1 44732
14 -10.0 42506
16 -8.9 40394
18 -7.8 38400
20 -6.7 36519
22 -5.6 34743
24 -4.4 33063
26 -3.3 31475
28 -2.2 29975
30 -1.1 28558
32 0.0 27219
34 1.1 25949
36 2.2 24749
38 3.3 23613
40 4.4 22537
42 5.6 21516
44 6.7 20546
46 7.8 19626
48 8.9 18754
50 10.0 17926
52 11.1 17136
54 12.2 16387
56 13.3 15675
58 14.4 14999
60 15.6 14356
62 16.7 13743
64 17.8 13161
66 18.9 12607
Table 1. Sensor Resistance
at Outdoor Temperature (Continued).
Outdoor Temperature
Ohms of
Resistance°F °C
68 20.0 12081
70 21.1 11578
72 22.2 11100
74 23.3 10644
76 24.4 10210
78 25.6 9795
80 26.7 9398
82 27.8 9020
84 28.9 8659
86 30.0 8315
88 31.1 7986
90 32.2 7672
92 33.3 7372
94 34.4 7086
96 35.6 6813
98 36.7 6551
100 37.8 6301
102 38.9 6062
104 40.0 5834
106 41.1 5614
108 42.2 5404
110 43 .3 52 03
112 44 .4 50 10
114 45 .6 48 26
116 46 .7 46 49
118 47 .8 44 79
120 48.9 4317
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
69-1709EFS G.H. 03-04 www.honeywell.com/yourhome
M1V 4Z9
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