![Fig. 52 - Space Temperature Sensor Typical Wiring](/images/new-backgrounds/33923/3392357x1.webp)
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
Connect
BRN (COM) |
|
| |
BLK (STO) | SENSOR |
BLU (SPT) | WIRING |
| |
|
|
OR SET SEN
OPB COM- PWR+ |
|
|
| POWER | 50HCQA |
24 VAC | WIRING |
|
NOTE: Must use a separate isolated transformer. |
|
|
|
| C07132 |
Fig. 52 - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Economizer Controls
Outdoor Air Enthalpy Control (PNO 33CSENTHSW) —
The enthalpy control (33CSENTHSW) is available as a
SEN
SEN J20-2
Fig. 50 - RTU-MP T-55 Sensor Connections
C08460
Locate the enthalpy control in the economizer next to the Actuator Motor. Locate two GRA leads in the factory harness and connect the gray lead labeled “ESL” to the terminal labeled “LOW”. See Fig. 36. Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to 24V) and BLK (connect to GND).
Connect
SEN J20-1
SEN J20-2
Jumper
SET
SET J20-3
Fig. 51 - RTU-MP T-56 Sensor Connections C08461
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
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