50TC
Field Connections - Field connections for accessory sensors and input devices are made the
Space Temperature (SPT) Sensors
A
S 33ZCT55SPT, space temperature sensor with override button
S 33ZCT56SPT, space temperature sensor with override button and setpoint adjustment
S 33ZCT59SPT, space temperature sensor with LCD (liquid crystal display) screen, override button, and setpoint adjustment
Use 20 gauge wire to connect the sensor to the controller. The wire is suitable for distances of up to 500 ft. Use a
Connect
SEN
SEN
C08460
Fig. 48 - RTU-MP T-55 Sensor Connections
Connect
SEN
SEN
Jumper
SET
SET
C08461
Fig. 49 - RTU-MP T-56 Sensor Connections
Connect
BRN (COM) |
|
| |
BLK (STO) | SENSOR |
BLU (SPT) | WIRING |
| |
|
|
OR SET SEN
OPB COM- PWR+
| POWER |
24 VAC | WIRING |
|
|
NOTE: Must use a separate isolated transformer.
C07132
Fig. 50 - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Economizer controls —
Outdoor Air Enthalpy Control (PNO HH57AC077) -
The enthalpy control (HH57AC077) is available as a
Locate the enthalpy control in the economizer hood. Locate two GRA leads in the factory harness and connect these leads to enthalpy control sensors 2 and 3. See Fig. 35. Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to TR) and BLK (connect to TR1).
The outdoor enthalpy changeover setpoint is set at the enthalpy controller.
Differential Enthalpy Control — Differential enthalpy control is provided by sensing and comparing the outside air and return air enthalpy conditions. Install the outdoor air enthalpy control as described above. Add and install a return air enthalpy sensor.
Return Air Enthalpy Sensor — Mount the
30