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SPACE
THERMOSTAT
THERMOSTAT
R
G
Y1
Y2
W1
W2
C
Fig. 51 — Space Thermostat Connections
If the 50TC unit has an economizer system and free-cooling
operation is required, a sensor representing Return Air Tem-
perature must also be connected (field-supplied and installed).
This sensor may be a T-55 Space Sensor (see Fig. 47) installed
in the space or in the return duct, or it may be sensor P/N
33ZCSENSAT, installed in the return duct. Connect this sensor
to TB1-1 and TB1-3 per Fig. 48.
CONFIGURE
THE
UNIT
MODE — Connect to the CCN bus using a CCN service tool
and navigate to PremierLink Configuration screen for Operat-
ing Mode. Default setting is Sensor Mode (value 1). Change
the value to 0 to reconfigure the controller for Thermostat
Mode.
When the PremierLink controller is configured for Thermo-
stat 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
INDOOR AIR QUALITY (CO
air quality sensor accessory monitors space carbon dioxide
(CO
) levels. This information is used to monitor IAQ levels.
2
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 infra-
red technology to measure the levels of CO
space air.
The CO
sensors are all factory set for a range of 0 to 2000
2
ppm and a linear mA output of 4 to 20. Refer to the instructions
supplied with the CO
sensor for electrical requirements and
2
terminal locations. See Fig. 52 for typical CO
schematic.
CTB
R
TB1
PL
2
J
4-12
J4-10
4
J4-8
6
8
J4-6
J4-4
10
CTB
C
THERMOSTAT
FOR
THERMOSTAT
) SENSOR — The
indoor
2
present in the
2
sensor wiring
2
H G 24 VAC
OR
+ -
24 VDC
2 1
J3
Fig. 52 — Indoor/Outdoor Air Quality (CO
(33ZCSENCO2)
To accurately monitor the quality of the air in the condi-
tioned air space, locate the sensor near a return-air grille (if
present) so it senses the concentration of CO
space. The sensor should be mounted in a location to avoid di-
rect 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 re-
turn airstream.
Wiring the Indoor Air Quality Sensor
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 con-
trol 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. 52. Connect the 4-20 mA terminal to terminal TB1-9 and
connect the SIG COM terminal to terminal TB1-11. See
Fig. 53.
IAQ Sensor
SEN
COM
24 VAC
Fig. 53 — Indoor CO
Refer to PremierLink Controller Installation, Start-up, and
Configuration Instructions, for detailed configuration informa-
tion.
OUTDOOR AIR QUALITY SENSOR (P/N 33ZCSENCO2
PLUS WEATHERPROOF ENCLOSURE) — The outdoor
air CO
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
40
+
0-10VDC
-
SIG COM
+
4-20mA
}
ALARM
NC
COM
RELAY
NO
CONTACTS
8 7 6 5 4 3 2 1
J4
) Sensor
2
Typical Wiring Diagram
—
leaving the
2
For each sensor, use
—
TB1
9
TB1
11
Sensor (33ZCSENCO2)
2
Connections
PL
J5-5
J5-3
)
2
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