Carrier 48TCA04---A12 }

requirements and terminal locations. See Fig. 50 for

typical CO2sensor wiring schematic.

87654321

24 VAC

24 VDC

NC ALARM

RELAY

CONTACTS

COM

}

0-10VDC

SIG COM (J4-6)

4-20mA (J4-5)

C07134

Fig. 50 --Indoor/Outdoor Air Quality (CO2)Sensor

(33ZCSENCO2) --Typical Wiring Diagram

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return--air

grille (if present) so it senses the concentration of CO2

leaving the space. The sensor should be mounted in a

location to avoiddirect breath contact.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

Wiring the Indoor Air QualitySensor —

For each sensor,use two 2--conductor 18 AWG(American

Wire Gage) twisted--pair cables (unshielded) to connect

the separate isolated 24 vac power source to the sensor

and to connect the sensor to the control board terminals.

To connectthe sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 50. Connect the 4--20 mA terminal to

terminal TB1--9 and connect the SIGCOM terminal to

terminal TB1--7. See Fig. 51.

SEN J5-5

J5-6

COM

TB1

IAQ Sensor

24 VAC

C08274

Fig. 51 --Indoor CO2Sensor (33ZCSENCO2)

Connections

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 CO2sensor is

designed to monitor carbon dioxide (CO2) levels in the

outside ventilation air and interface with the ventilation

damper in an HVACsystem. The OAQ sensoris packaged

with an outdoor cover. See Fig. 52. The outdoor air CO2

sensor must be located in the economizer outside air hood.

COVER REMOVED SIDE VIEW

C07135

Fig. 52 --Outdoor Air Quality Sensor Cover

Wiringthe Outdoor Air CO2Sensor — 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 terminals1 and 2.

To connectthe sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 50. Connect the 4 to 20 mA

terminal to 48TC’s terminal TB1--11. Connect the SIG

COMterminal to 48TC’sterminal TB1--13.See Fig. 53.

SEN J5-2

J5-3

COM

TB1

TB1 PL

OAQ Sensor/RH Sensor

24 VAC

C08275

Fig. 53 --Outdoor CO2Sensor 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 48TC units equipped with factory--installed Smoke

Detector(s), the smoke detectorcontroller implements the

48TC