Installation; Location And Mounting - Honeywell T775A Product Data

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 ratings given in instructions and on the product to
ensure 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.
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 any convenient interior location using
the two mounting holes provided on the back of the metal
enclosure (mounting screws are not provided and must be
obtained separately). Use controller dimensions in Fig. 1
(T775A,B) or Fig. 2 (T775C,D) as a guide.
Sensor Location
The 193987GA Sensor can be located up to 1000 feet (304m)
from the T775 using standard AWG 18/2 unshielded wire. For
cable runs greater than 25 feet shielded cable is
recommended. See Fig. 5. It may be located on pipes, in an
immersion well, in a wall-mounted case or on a bulb holder.
See Fig. 7. The 193987GA is not a water tight or water
resistant sensor. For wet applications, see the Accessories list
in the Specifications section.
Multiple sensors can be parallel-series wired to sense average
temperatures in large spaces.
To maintain control accuracy, the number of sensors parallel-
series wired must be of the n2 power (for example, 4, 9, 16,
etc.). See Fig. 8.
Sensor Mounting
Sensors can be mounted on a wall or panel for sensing space
temperature (Fig. 7), strapped to a pipe or inserted in a well
(Fig. 6) for hot/cold water sensing, or taped to a standard cap
or bulb holder for duct air sensing. To prevent moisture or
condensation entering the sensor through the leadwire holes,
mount the sensor with the lead wires exiting the bottom of the
sensor.
T775A,B,C,D REMOTE TEMPERATURE CONTROLLER
GROUND
SHIELD
TO T775
CABLE OR TO
GROUNDING
SCREW
SHIELDED
CABLE
SHIELDED
CABLE
NOTE: DO NOT GROUND
SHIELDED CABLE AT
SENSOR END.
NOTE: TO MINIMIZE NOISE PICKUP, MAKE CONNECTION
FROM SHIELDED CABLE AS CLOSE AS POSSIBLE
TO SENSOR BODY.
Fig. 5. Using shielded cable (cable runs longer than 25 ft).
NOTE: Use heat conductive compound in immersion wells.
See Accessories in the Specifications section.
CAUTION
Electrical Shock Hazard.
Can short equipment circuitry.
Make sure that metal tube of sensor does not short
against T terminals in wall-mounted case.
COVER SENSOR
LEADS WITH
HEAT CONDUCTIVE
COMPOUND
Fig. 6. Sensor inserted in immersion well.
5
T775
SET
SELECT ENTER
4 6
1 2 3 5 7 8
24V SENSOR
SENSOR TOD
B
A
OUTPUT 2 OUTPUT 1
NC
NC
COM
COM
NO
NO
NO
NO
COM
COM
NC
NC
OUTPUT 3
OUTPUT 4
GROUNDING SCREW
SENSOR
SENSOR PLACED
IN WELL
1/2 NPT
C \ F
SA SB
120V
COM
240V
M7430
IMMERSION
WELL
M5249
63-2489—2