49
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
2
) SENSOR
The indoor air quality sensor accessory monitors space
carbon dioxide (CO
2
) levels. This information is used to
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
2
present in the space air.
The CO
2
sensors are all factory set for a range of 0 to 2000
ppm and a linear mA output of 4 to 20. Refer to the instruc-
tions supplied with the CO
2
sensor for electrical requirements
and terminal locations. See Fig. 68 for typical CO
2
sensor
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
2
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. 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.
Fig. 68 — Indoor/Outdoor Air Quality (CO
2
) Sensor
(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. 68. Connect the 4-20 mA terminal to terminal TB3-9
and connect the SIG COM terminal to terminal TB3-11. See
Fig. 69.
Fig. 69 — Indoor CO
2
Sensor (33ZCSENCO2)
Connections
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
2
sensor is designed to monitor carbon
dioxide (CO
2
) levels in the outside ventilation air and inter-
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
2
sensor must be located in the economiz-
er outside air hood.
Fig. 70 — Outdoor Air Quality Sensor Cover
Wiring the Outdoor Air CO
2
Sensor
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.
Fig. 71 — Outdoor CO
2
Sensor Connections
8
7 6 5 4
3
2 1
2 1
H G 24 VAC
OR
24 VDC
NC
ALARM
RELAY
CONTACT
S
COM
NO
}
0-10VDC
S
IG COM
4-20mA
+
+
-
+ -
J
3
J4
SEN
J5-5
J5-3
COM
9
11
TB3
TB3
IAQ Sensor
PL
24 VAC
COVER REMOVED
S
IDE VIEW
SEN
J5-2
J5-3
COM
13
11
TB3
TB3
OAQ Sensor
PL
24 VAC
Summary of Contents for WeatherMaster 50HC14
Page 4: ...4 Fig 2 Unit Dimensional Drawing 14 Size Unit ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit cont HORIZONTAL ECONOMIZER VERTICAL ECONOMIZER ...
Page 8: ...8 Fig 4 Roof Curb Details ...
Page 24: ...24 Fig 46 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 39: ...39 Fig 54 50HC14 Control Box Component Locations with ComfortLink Controls ...
Page 40: ...40 Fig 55 50HC14 ComfortLink Control Wiring Diagram ...
Page 41: ...41 Fig 56 50HC14 ComfortLink Power Wiring Diagram ...
Page 42: ...42 Fig 57 50HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...
Page 44: ...44 Fig 60 PremierLink Wiring Schematic ...
Page 45: ...45 Fig 61 PremierLink Wiring Schematic with Humidi MiZer System Option ...
Page 53: ...53 Fig 80 RTU Open System Control Wiring Diagram ...
Page 54: ...54 Fig 81 RTU Open System Control Wiring Diagram with Humidi MiZer System Option ...
Page 64: ......
Page 65: ......