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Table 3. 10K thermistor output.
Resistance
97820
32740
19920
12500
10000
8056
5326
3604
2491
1756
1261
920.9
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.
IMPORTANT
All wiring must agree with applicable codes,
ordinances and regulations.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Location and Mounting
Mount the controller on a convenient interior location using the
three mounting holes provided on the back of the enclosure
(mounting screws are not provided and must be obtained
separately). Use controller dimensions in Fig. 1 as a guide.
°C
°F
-20
-4
0
32
10
50
20
68
25
77
30
86
40
104
50
122
60
140
70
158
80
176
90
194
T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS
Sensor Location
The sensor can be located up to 400 feet (122 meters) from
the T7079 using standard AWG 18/2 unshielded wire. The
sensor may be attached to pipes, in an immersion well, in a
wall-mounted case or on a bulb holder.
NOTES:
—
For cable runs greater than 25 feet, shielded cable
is recommended.
—
Multiple sensors can be parallel-series wired to
sense average temperatures in large spaces.
See Fig. 2.
—
To maintain control accuracy, the number of
sensors wired parallel-series must be n
(examples: 4, 9, 16).
SENSORS
Fig. 2. Parallel-series wiring of sensors.
Sensor Mounting
IMPORTANT
The T7079 is an operation control, not a limit or safety
control. If used in applications requiring safety or limit
controls, use a separate safety or limit control device
in conjunction with the T7079.
Mount the sensor(s) in one of the following manners:
— Hot/cold water sensing: Strap sensor to a pipe or insert in a
well (see Fig. 3).
— Space temperature sensing: Mount on a wall or panel
(see Fig. 4).
— Duct air sensing: Tape to a standard cap or bulb holder.
COVER SENSOR
LEADS WITH
HEAT CONDUCTIVE
COMPOUND
Fig. 3. Sensor inserted in an immersion well.
3
2
TO T7079
M13129
SENSOR PLACED
IN WELL
1/2 NPT
IMMERSION
WELL
M5249
63-2572—04
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