NOTE:
Optional Outdoor Temperature Control
at One Heater Stage –
Move either heater wire to this terminal and connect outdoor temperature switch between 2nd and 3rd terminals.
548J*14D
C10354
Fig. 31 - Accessory Electric Heater Control Connections
Outdoor Air Enthalpy Control (PNO 33CSENTHSW)
The enthalpy control (33CSENTHSW) is available as a
Return Air Enthalpy Sensor —
Mount the
the enthalpy control. (The separate
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. 32. Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to 24V) and BLK (connect to GND).
The outdoor enthalpy changeover setpoint is set at the enthalpy controller.
Differential Enthalpy Control —
Differential enthalpy control is provided by sensing and
B R
LE K D
Enthalpy |
|
|
| |||
Switch | 24V |
| RED | |||
– |
|
|
| |||
|
|
| ||||
| GND |
| BLK | |||
In |
|
|
|
| ||
| ||||||
|
|
|
|
|
|
|
+VDC Out
LOW | GRA |
Return Air
Enthalpy Sensor
+
–
ESL
| ECONO | |
| MOTOR | |
7 | CTB | |
ECON | ||
|
Factory
Wiring
Harness
C10282
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.
Fig. 32 - Outside and Return Air Enthalpy Sensor
Wiring
18