Bryant 548J*14D RTU-MP / Indoor CO2 Sensor, 33ZCSENCO2 Connections, weatherproof enclosure, J4-2

To connect the sensor to the control, identify the positive (4 to 20 mA) and ground (SIG COM) terminals on the sensor. See Fig. 42. Connect the 4-20 mA terminal to RTU-MP J4-2 and connect the SIG COM terminal to RTU-MP J4-3. See Fig. 43.

IAQ Sensor

					SEN	J4-2
					COM
						J4-3
		24 VAC
						C08462
			Fig. 43 - RTU-MP / Indoor CO2 Sensor
				(33ZCSENCO2) Connections
548J*14D
	The outdoor air CO2 sensor is designed to monitor carbon
	Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
	weatherproof enclosure) —
	dioxide (CO2) levels in the outside ventilation air and
	interface with the ventilation damper in an HVAC system.
	The OAQ sensor is packaged with an outdoor cover. See
	Fig. 44. The outdoor air CO2 sensor must be located in the
	economizer outside air hood.

COVER REMOVED SIDE VIEW

C07135

Fig. 44 - Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO2 Sensor: A dedicated power supply is required for this sensor. A two-wire cable is required to wire the dedicated power supply for the sensor. The two wires should be connected to the power supply and terminals 1 and 2.

To connect the sensor to the control, identify the positive (4 to 20 mA) and ground (SIG COM) terminals on the OAQ sensor. See Fig. 42. Connect the 4 to 20 mA terminal to RTU-MP J4-5. Connect the SIG COM terminal to RTU-MP J4-6. See Fig. 45.

OAQ Sensor/RH Sensor

SEN J4-5

COM J4-6

24 VAC

C08463

Fig. 45 - RTU-MP / Outdoor CO2 Sensor

(33ZCSENCO2) Connections

On 548J*14D units equipped with factory-installed Smoke Detector(s), the smoke detector controller implements the unit shutdown through its NC contact set connected to the unit’s CTB input. The FSD function is initiated via the smoke detector’s Alarm NO contact set. The RTU-MP controller communicates the smoke detector’s tripped status to the BAS building control. See Fig. 35, RTU-MP System Control wiring schematic.

The Fire Shutdown Switch configuration, MENU→Config→Inputs→input 5, identifies the normally open status of this input when there is no fire alarm.

Connecting Discrete Inputs —

Filter Status: The filter status accessory is a field-installed accessory. This accessory detects plugged filters. When installing this accessory, the unit must be configured for filter status by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Filter Status and normally open (N/O) or normally closed (N/C). Input 8 or 9 is recommended for easy of installation. Refer to Fig. 33 and Fig. 35 for wire terminations at J5.

Fan Status: The fan status accessory is a field-installed accessory. This accessory detects when the indoor fan is blowing air. When installing this accessory, the unit must be

configured for fan status by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan Status and normally open (N/O) or normally closed (N/C). Input 8 or 9 is recommended for easy of installation. Refer to Fig. 33 and Fig. 35 for wire terminations at J5.

Remote Occupancy: The remote occupancy accessory is a field-installed accessory. This accessory overrides the unoccupied mode and puts the unit in occupied mode. When installing this accessory, the unit must be configured for remote occupancy by setting MENU→Config→Inputs→input 3, 5, 8, or 9 to Remote Occupancy and normally open (N/O) or normally closed (N/C).

Also set MENU→Schedules→occupancy source to DI on/off. Input 8 or 9 is recommended for easy of installation. Refer to Fig. 33 and Table 2 for wire terminations at J5.

24