Remote Room Temperature Sensor; Indoor-Air Quality Sensor - Carrier 33CS Installation, Service And Instructions

Remote Room Temperature Sensor

pass controller can measure zone temperature through a solid-
state temperature sensor located at a remote location up to
1000 ft from the bypass controller. The sensor has a range of
30 to 180 F in 1/10 degree increments. The remote room
temperature sensor is connected to the bypass controller through
the wiring connector board. See Fig. 11. Up to 4 remote room
sensors can be used. When more than one remote room sen-
sor is used, the temperatures are averaged.
All sensors must be wired in parallel. When adding re-
mote room sensors, a field-supplied 9.2 K ohm resistor must
be added to the connector block for each sensor. See Fig. 11.
Fig. 9 — Duct Temperature Sensor
Fig. 10 — Zone Temperature Sensor
NOTE: For each additional sensor (2 or more total) a resistor must be
added. Resistors are wired in parallel between terminals RS- and W
on the thermostat terminal block.
Example shown is for 4 Remote Room Sensors.
Fig. 11 — Remote Room Sensor Wiring
REMOTE ROOM TEMPERATURE SENSOR CALIBRA-
— The by-
TION — To calibrate the remote room temperature sensor,
configure category 5, option 3. The temperature reading of
the sensor will be displayed. Compare the reading to an ac-
curate thermometer placed in the approximate center of the
space (or measure temperature at each sensor and manually
compute the average). Use the left upper or lower informa-
tion buttons to raise or lower the temperature reading (by
tenths of a degree) until the desired calibrated temperature is
shown. The range of possible temperatures is 30 to 180 F.

Indoor-Air Quality Sensor

ture allows the Carrier Comfort system to interface with the
economizer (if available) on the HVAC equipment and main-
tain the quality of indoor air within acceptable limits. An
IAQ sensor (CO
zone or in the return air duct. On bypass controllers, the by-
pass controller is configured to either participate in the IAQ
system, or to ignore IAQ commands. The bypass controller
will not participate in IAQ mode when a local IAQ mode
occurs on a zone controller.
When the CO
figuration is 1000 ppm and special software is required to
modify this value), the sensor signals the indoor fan motor
to run for 5 to 30 minutes (field-configured). The indoor fan
circulates the air throughout the occupied space. At the end
of the 5 to 30 minutes, if the CO
point, the system will enter IAQ mode.
When the system is bringing in additional outside air (in
IAQ mode), the bypass controller will modulate its damper
to keep system static pressure at the IAQ Pressure Set Point
to allow the outside air to circulate. A set of contacts are also
available on the relay pack which can be used to start a local
exhaust fan when the system is bringing in additional out-
side air. The bypass controller will display status when the
system is in this mode. When the IAQ level drops below the
IAQ set point, the bypass damper returns to its standard op-
erating mode. Sensor contacts open for 4
IAQ mode.
To configure the IAQ sensor option, set category 14,
option 1. When the option is configured ON, the bypass con-
troller will modulate during IAQ fan operation. When the
option is configured OFF, the IAQ commands are not used.
The default is OFF.
IAQ PRESSURE SET POINT — When the IAQ mode brings
in fresh outdoor air, the system static pressure will rise or
drop depending on the amount of air needed and the number
of zones participating in the IAQ mode. The IAQ Pressure
Set Point option will keep the system static pressure at the
defined value to allow the necessary airflow through the sys-
tem. The option is configured in category 14, option 2. The
set point can be configured from 0.0 to 5.0 in. wg. The de-
fault value is 0.0 in. wg.
IAQ ALARM DELAY — The IAQ Alarm Delay option con-
trols how long the bypass controller will wait before issuing
an IAQ alarm. To configure the IAQ Alarm Delay option,
set category 14, option 3. The number of minutes will be
shown. The range of acceptable values is 0 to 240 minutes
in 1 minute increments. Use the left set point buttons to set
the time limit to the desired value. The default value is
0 minutes.
12
— The Comfort IAQ fea-
) is used to monitor the IAQ levels in a
2
level exceeds the preset level (factory con-
2
level still exceeds the set
2
1 ⁄ minutes to end
2