Carrier 50TCA04-A07 appendix Indoor CO2 Sensor 33ZCSENCO2 Connec, Tions

	IAQ Sensor			TB1	PL
			SEN	9	J5-5
				TB1	J5-6
			COM	7
		24 VAC
					C08274
	Fig. 44 - Indoor CO2 Sensor (33ZCSENCO2) Connec-
				tions
	Refer to Form 33CS-58SI, PremierLink Installation,
	Start-up, and Configuration Instructions, for detailed
	configuration information
	Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
	weatherproof enclosure) — The outdoor air CO2 sensor is
	designed to monitor carbon dioxide (CO2) levels in the
50TC	outside ventilation air and interface with the ventilation
	damper in an HVAC system. The OAQ sensor is packaged
	with an outdoor cover. See Fig. 45. The outdoor air CO2
	sensor must be located in the economizer outside air hood.

COVER REMOVED SIDE VIEW

C07135

Fig. 45 - 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. 43. Connect the 4 to 20 mA terminal to 50TC’s terminal TB1-11. Connect the SIG COM terminal to 50TC’s terminal TB1-13. See Fig. 461.

OAQ Sensor/RH Sensor

TB1PL SEN 13 J5-2

TB1

COM 11 J5-3

24 VAC

C08275

Fig. 46 - Outdoor CO2 Sensor Connections

Refer to Form 33CS-58SI, PremierLink Installation, Start-up, and Configuration Instructions, for detailed configuration information.

Smoke Detector/Fire Shutdown (FSD) — This function is available only when PremierLink is configured for (Space) Sensor Mode. The unit is factory-wired for PremierLink FSD operation when PremierLink is factory-installed.

On 50TC 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 LCTB input. The FSD function is initiated via the smoke detector’s Alarm NO contact set. The PremierLink communicates the smoke detector’s tripped status to the CCN building control. See Fig. 23 for unit smoke detector wiring.

Alarm state is reset when the smoke detector alarm condition is cleared and reset at the smoke detector in the unit.

If the PremierLink mode has been changed to Thermostat, disconnect the BLU lead (from LCTB DDC-1) at TB1-6 (Y2) and tape off before connecting the thermostat to TB1.

Filter Status Switch — This function is available only when PremierLink is configured for (Space) Sensor Mode.

PremierLink control can monitor return filter status in two ways: By monitoring a field-supplied/installed filter pressure switch or via supply fan runtime hours.

Using switch input: Install the dirty filter pressure switch according to switch manufacturer’s instructions, to measure pressure drop across the unit’s return filters. Connect one side of the switch’s NO contact set to LCTB’s THERMOSTAT-R terminal. Connect the other side of the NO contact set to TB1-10. Setpoint for Dirty Filter is set at the switch. See Fig. 47.

Filter Switch (NO, close on rising pressure (high drop))

LCTB

Thermostat

R

TB1PL

10 J4-4

C08216

Fig. 47 - PremierLink Filter Switch Connection

When the filter switch’s NO contact set closes as filter pressure drop increases (indicating dirt-laden filters), the input signal to PremierLink causes the filter status point to read “DIRTY”.

Using Filter Timer Hours: Refer to Form 33CS-58SI for instructions on using the PremierLink Configuration screens and on unit alarm sequence.

Supply Fan Status Switch — The PremierLink control can monitor supply fan operation through a field-supplied/installed differential pressure switch. This

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