Carrier 50TCQA - Page 23

23
8
7
6
5
4
32
1
2
1
HG
24 VAC
OR
24 VDC
NC
ALARM
RELAY
CONTACTS
COM
NO
}
0-10VDC
SIG COM
4-20mA
+
+
-
+
-
J3 J4
C08635
Fig. 38 -- Indoor/Outdoor Air Quality (CO
2
)Sensor
(33ZCSENCO2) -- Typical Wiring Diagram
To accurately monitor the quality of the a ir in the
conditioned air space, locate the sensor near a return--air
grille (if present) so it senses the concentration of CO
2
leaving the space. The sensor should be mounted in a
location to avoid direct breath c ontact.
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 se nsor where it is influence d
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 Quality Sensor —
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 c ontrol board terminals.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 38. Connect the 4--20 mA terminal to
terminal TB1--9 and connect the SIG COM terminal to
terminal TB1--11. See Fig. 39.
SEN J5-5
J5-3
COM
9
11
TB1
TB1
IAQ Sensor
PL
24 VAC
C08636
Fig. 39 -- Indoor CO
2
Sensor (33ZCSENCO2)
Connections
Refer to Form 33CS--58SI, PremierLink Installation,
Start--up, and Configurat ion Instructions, for detailed
configuration information
Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
weathe rproof enclosure) — The outdoor air CO
2
sensor is
designed to monitor carbon dioxide (CO
2
) 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. 40. The outdoor a ir CO
2
sensor must be located in the economizer outside air hood.
COVER REMOVED SIDE VIEW
C07135
Fig. 40 -- Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO
2
Sensor — A dedicated powe r
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 t he 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. 38. Connect the 4 to 20 mA
terminal to the TB1--13 terminal of the 50TCQ. Connect
the SIG COM terminal to the TB1--11 terminal of the
50TCQA. See Fig. 41.
SEN J5-2
J5-3
COM
13
11
TB1
TB1
PL
OAQ Sensor/RH Sensor
24 VAC
C08275
Fig. 41 -- Outdoor CO
2
Sensor Connections
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.
50TCQA