Outside-Air Temperature Sensor; Indoor-Air Humidity Sensor; Indoor-Air Quality Sensor - Carrier 33CS Installation, Service, And Troubleshooting Instructions

When the DX Coil Temperature Sensor option is set to ON,
the TEMP system thermostat will use information from the
temperature sensor for high and low temperature limits. The
high limits for this sensor are fixed at 105 F for second stage
and 110 F for first stage. The low limits are configured in cate-
gory 4, options 5 and 6.
When the DX Coil Temperature Sensor option is set to OFF,
the TEMP system thermostat will not use information from the
temperature sensor for high and low temperature limits.
To configure the DX Coil Temperature Sensor option, con-
figure category 5, option 6. Use the left set point buttons to tog-
gle the option ON and OFF. The default value is OFF.
DX COIL TEMPERATURE SENSOR CALIBRATION —
To calibrate the DX coil temperature sensor, Configure cate-
gory 5, option 7. Obtain a correct temperature reading with an
accurate thermometer. Use the left set point buttons to raise or
lower the temperature until the desired reading is shown. The
range of possible temperatures is 30 to 180 F.
Outside-Air Temperature Sensor —
tem thermostat measures outside-air temperature through a
solid-state temperature sensor. The sensor can be located up to
1000 ft from the single zone relay pack. The sensor measures
temperature with a range of –40 to 150 F with
resolution.
The temperature sensor is interfaced through the single zone
relay pack. See Fig. 3.
When the Outside-Air Temperature Sensor option is set to
ON, the TEMP system thermostat will measure outside-air
temperature and broadcast the outside-air temperature informa-
tion on the network.
When the Outside-Air Temperature Sensor option is set to
OFF, the TEMP system thermostat can receive outside-air in-
formation broadcast from another device on the network. A
communication bus must have only one outdoor-air sensor.
To configure the Outside-Air Temperature Sensor option,
configure category 5, option 8. Use the left set point buttons to
toggle the option ON and OFF. The default value is OFF.
OUTSIDE-AIR TEMPERATURE SENSOR CALIBRA-
TION — To calibrate the outside-air temperature sensor, con-
figure category 5, option 9. Obtain a correct temperature
reading with an accurate thermometer. The range of possible
temperatures is –40 to 150 F. Use the left set point buttons to
raise or lower the temperature until the desired temperature is
shown.
Indoor-Air Humidity Sensor —
thermostat measures relative humidity through a solid-state hu-
midity sensor. The sensor can be located up to 1000 ft from the
single zone relay pack. The sensor measures humidity with a
range of 0 to 100%.
The humidity sensor is interfaced through the single zone
relay pack. See Fig. 3.
When the Indoor-Air Humidity Sensor option is set to ON,
the TEMP system thermostat will measure relative humidity
and broadcast the relative humidity information on the
network.
When the Indoor-Air Humidity Sensor option is set to OFF,
the TEMP system thermostat can receive relative humidity in-
formation broadcast from another device on the network.
To configure the Indoor-Air Humidity Sensor option, con-
figure category 5, option 11. Use the left set point buttons to
toggle the display. When the option is set to 0, neither the hu-
midity sensor nor the filter status sensor is used. When the op-
tion is set to 1, a humidity sensor is used. When the option is set
to 2, a filter status sensor is used. The default is 0.
NOTE: The humidity sensor and the filter status sensor cannot
be used at the same time.
The TEMP sys-
1
/ -degree
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The TEMP system
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INDOOR-AIR HUMIDITY SENSOR CALIBRATION — To
calibrate the indoor-air humidity sensor, configure category 5,
option 12. Obtain a correct humidity reading with an accurate
psychrometer. The range of possible humidity readings is 0 to
100%. Use the left set point buttons to raise or lower the read-
ing until the desired humidity is shown.
Indoor-Air Quality Sensor —
ture allows the Carrier Comfort system to interface with the
economizer on the HVAC equipment and maintain the quality
of indoor air within acceptable limits. An IAQ sensor (CO
used to monitor the IAQ levels in a zone.
When the CO level exceeds the preset level (factory con-
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figuration is 1000 ppm and user software is required to change
set point), the sensor signals the indoor-fan motor to run. If the
auxiliary relay is user-configured to participate in IAQ, the
auxiliary relay will energize. If the auxiliary relay is wired to
the economizer, the IAQ uses the IAQ Economizer Delay for
the first IAQ mode of the day. The indoor fan circulates the air
throughout the occupied space. At the end of the 5 to 30 min-
utes, if the CO level still exceeds the set point, the economizer
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damper opens. This forces fresh outside air to enter the space.
When the IAQ level drops below the IAQ set point, the econo-
mizer returns to its standard operating mode. The IAQ sensor
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contacts open for 4 / minutes to end IAQ mode.
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When the system is bringing in additional outside air, the
thermostat is reset 0 to 10° F (field-configured) above or below
the original set point to allow the outside air to circulate before
the heating or cooling mode is initiated.
When the IAQ mode brings in fresh outdoor air, the space
temperature and humidity will rise or fall depending on the
outside-air temperature and humidity. The IAQ Temperature
and Humidity Lockout Set Points limit the air to be brought
into the zone to satisfy IAQ requirements upon start of IAQ
mode.
IAQ SENSOR CALIBRATION — IAQ sensor calibration can
only be done with special calibration software which must be
purchased. Call a local Carrier representative for more infor-
mation about this product.
IAQ SENSOR — To configure the IAQ sensor option, set cat-
egory 14, option 1. When the option is configured ON, the
TEMP system thermostat will use information from the system
IAQ sensor. When the option is configured OFF, the IAQ sen-
sor is not used. The default is OFF.
IAQ ECONOMIZER DELAY — The IAQ Economizer Delay
option controls how long the indoor fan will run before the
economizer is energized once in IAQ mode. To configure the
IAQ Economizer Delay option, set category 14, option 2. The
number of minutes will be shown. The range of acceptable val-
ues is 5 to 30 minutes in 1-minute increments. Use the left set
point buttons to set the time limit to the desired value. The
default value is 10 minutes.
IAQ MAXIMUM SPACE TEMPERATURE RESET —When
the IAQ mode brings in fresh outdoor air, the space tempera-
ture will rise or fall depending on the outside-air temperature.
The IAQ Maximum Space Temperature Reset is the maximum
amount of deviance from the set point that a zone will allow to
satisfy IAQ requirements. The IAQ Maximum Space Temper-
ature option will keep the HVAC equipment from entering
heating or cooling unless the temperature change is greater
than the set point. The option is configured in category 14,
option 3. The set point can be configured from 0 to 10° F. The
default value is 2° F.
IAQ HUMIDITY LOCKOUT SET POINT — When the IAQ
mode brings in fresh outdoor air, the space humidity will rise
or fall depending on the outside air humidity. The IAQ Humid-
ity Lockout Set Point is the maximum outdoor air humidity
reading at which a zone will allow air to be brought into the
zone to satisfy IAQ requirements. The IAQ Humidity Lockout
The Comfort IAQ fea-
) is
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