Economizer Controls - Carrier WeatherMaster 50HC14 Installation Instructions Manual

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 controller is configured for Ther-
mostat Mode, these functions are not available: Fire Shut-
down (FSD), Remote Occupied (RMTOCC), Compressor
Safety (CMPSAFE), Supply Fan Status (SFS), and Filter
Pressure Switch (FILTER).

Economizer Controls

INDOOR AIR QUALITY (CO
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 tem-
perature 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 2000
2
ppm and a linear mA output of 4 to 20. Refer to the instruc-
tions supplied with the CO
2
and terminal locations. See Fig. 68 for typical CO
wiring schematic.
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
direct breath contact.
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources. Al-
low at least 3 ft (0.9 m) between the sensor and any corner.
Avoid mounting the sensor where it is influenced by the sup-
ply 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. 68 — Indoor/Outdoor Air Quality (CO
(33ZCSENCO2)
—
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
) SENSOR
2
sensor for electrical requirements
2
leaving the
2
+ 0-10VDC
-
SIG COM
+
4-20mA
NC } ALARM
COM
RELAY
NO CONTACTS
) Sensor
2
Typical Wiring Diagram
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. 68. Connect the 4-20 mA terminal to terminal TB3-9
and connect the SIG COM terminal to terminal TB3-11. See
Fig. 69.
IAQ Sensor
24 VAC
Fig. 69 — Indoor CO
Refer to PremierLink Controller Installation, Start-up, and
Configuration Instructions, for detailed configuration infor-
mation.
OUTDOOR AIR QUALITY SENSOR (P/N 33ZCSENCO2
PLUS WEATHERPROOF ENCLOSURE)
The outdoor air CO
dioxide (CO
sensor
face with the ventilation damper in an HVAC system. The
OAQ sensor is packaged with an outdoor cover. See Fig. 70.
The outdoor air CO
er outside air hood.
COVER REMOVED
Fig. 70 — Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO
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 pow-
er 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 sen-
sor. See Fig. 68. Connect the 4 to 20 mA terminal to the TB3-
13 terminal of the 50HC**14. Connect the SIG COM terminal
to the TB3-11 terminal of the 50HC**14. See Fig. 71.
OAQ Sensor
24 VAC
Fig. 71 — Outdoor CO
49
TB3
SEN
TB3
COM
Sensor (33ZCSENCO2)
2
Connections
sensor is designed to monitor carbon
2
) levels in the outside ventilation air and inter-
2
sensor must be located in the economiz-
2
Sensor
2
TB3
SEN 13
TB3
COM
Sensor Connections
2
PL
9 J5-5
11 J5-3
SIDE VIEW
PL
J5-2
11 J5-3