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If the 50HCQ unit has an economizer system and
free- - cooling operation is required, a sensor representing
Return Air Temperature must also be connected
(field- - supplied and installed). This sensor may be a T- - 55
Space Sensor (see Fig. 36) installed in the space or in the
return duct, or it may be sensor PNO 33ZCSENSAT,
installed in the return duct. Connect this sensor to TB3- - 1
and TB3- - 3 per Fig. 37.
Configure the unit for Thermostat Mode —
Connect to the CCN bus using a CCN service tool and
navigate to PremierLink Configuration screen for
Operating Mode. Default setting is Sensor Mode (value
1). Change the value to 0 to reconfigure the controller for
Thermostat Mode.
When the PremierLink is configured for Thermostat
Mode, these functions are not available: Fire Shutdown
(FSD), Remote Occupied (RMTOCC), Compressor Safety
(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure
Switch (FILTER).
Economizer Controls
To wire the return air enthalpy sensor, perform the
following:
1. Use a 2- - conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthal-
py controller.
2. Connect the field- - supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (- - ) spade connector on the return air en-
thalpy sensor and the (- - ) terminal on the enthalpy
controller.
Indoor Air Quality (CO
sensor) —
2
The indoor air quality sensor accessory monitors space
carbon dioxide (CO
) levels. This information is used to
2
monitor IAQ levels. Several types of sensors are available,
for wall mounting in the space or in return duct, with and
without LCD display, and in combination with space
temperature sensors. Sensors use infrared technology to
measure the levels of CO
present in the space air.
2
The CO
sensors are all factory set for a range of 0 to
2
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO
requirements and terminal locations. See Fig. 41 for
typical CO
sensor wiring schematic.
2
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 CO
leaving the space. The sensor should be mounted in a
location to avoid direct 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
sensor for electrical
2
2
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.
H G 24 VAC
OR
+ -
24 VDC
2 1
8 7 6 5 4 3 2 1
J3
J4
Fig. 41 - - Indoor/Outdoor Air Quality (CO
(33ZCSENCO2) - - Typical Wiring Diagram
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 control 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. 41. Connect the 4- - 20 mA terminal to
terminal TB3- - 9 and connect the SIG COM terminal to
terminal TB3- - 11. See Fig. 42.
IAQ Sensor
SEN
COM
24 VAC
Fig. 42 - - Indoor CO
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 CO
sensor is designed to monitor carbon
2
dioxide (CO
) levels in the outside ventilation air and
2
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
24
+
0-10VDC
-
SIG COM
+
4-20mA
}
ALARM
NC
COM
RELAY
NO
CONTACTS
C08635
) Sensor
2
TB3
9
J5-5
TB3
11
J5-3
C10284
Sensor (33ZCSENCO2)
2
PL
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