Wiring Connections Access

T775A/B/M SERIES 2000 CONTROLLER

WIRING

To access the wiring connections, remove the two screws on the left side of the enclosure and gently swing open the top. Be careful to not stress the ribbon cables that connect the keypad and LCD display to the controller circuit board.

Temperature Sensor Wiring

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.

IMPORTANT

Poor wiring practices can cause erratic readings from the sensor. Avoid the following to ensure proper operation:

•Do not route the temperature sensor wiring with building power wiring.

•Do not locate the temperature sensor wiring next to control contactors.

•Do not locate the temperature sensor wiring near electrical motors.

•Do not locate the temperature sensor wiring near welding equipment.

•Make sure good mechanical connections are made to both the sensor and the controller.

•Do not mount the sensor with the lead wire end pointing up in an area where condensation can occur.

If any of the above conditions cannot be avoided, use shielded cable.

NOTE: Each T775 controller must be wired to its own sensor(s). However, a benefit of the T775 controller’s accuracy is that there is no more than a 2°F differential between any two T775 controllers.

Multiple Parallel Sensors

Multiple sensors can be parallel-series wired to sense average temperatures in large spaces. To maintain control accuracy, the number of sensors to be parallel- series wired must be of the n2 power (for example, 4, 9, 16, etc.). See Fig. 3.

SENSORS

TO T775 CONNECTIONS (SENSOR A) OR (SENSOR B).

M24471

Fig. 3. Parallel-series wiring of sensors.

Temperature Sensor Wire Type and Size

Temperature sensors use standard AWG 18/2 unshielded wire. For cable runs greater than 25 feet or where electrical interference may be a problem, shielded cable is recommended. See Fig. 4.

Refer to “Temperature Sensor Calibration” on page 10 for wire size selection where cable runs are longer than 25 feet.

SHIELDED

CABLE

SENSOR A

NOTE: SHIELDED CABLE MUST BE CONNECTED TO AN EARTH

T SENSOR B

SHIELDED

CABLE

1SENSOR A AND SENSOR B TERMINAL WIRING IS POLARITY INSENSITIVE.

GROUND.

HOWEVER, DO NOT GROUND SHIELDED CABLE AT SENSOR END.

SENSOR

NOTE: TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.

M24472

Fig. 4. Sensor wiring — showing shielded cable connection to Sensor A.

62-0254–03

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