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

When the Outside-Air Temperature Sensor option is set to
OFF, the TEMP system thermostat can receive outside-air
information 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 tem-
peratures 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
humidity sensor. The sensor can be located up to 1000 ft
from the single zone relay pack. The sensor measures hu-
midity 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
information 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
humidity sensor nor the filter status sensor is used. When the
option 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 can-
not be used at the same time.
INDOOR-AIR HUMIDITY SENSOR CALIBRATION —
To calibrate the indoor-air humidity sensor, configure cat-
egory 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 reading 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 qual-
ity of indoor air within acceptable limits. An IAQ sensor (CO
is used to monitor the IAQ levels in a zone.
When the CO level exceeds the preset level (factory con-
2
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 minutes, if the CO level still exceeds the set point, the
2
economizer damper opens. This forces fresh outside air to
enter the space. When the IAQ level drops below the IAQ
set point, the economizer returns to its standard operating
mode. The IAQ sensor contacts open for 4
IAQ mode.
When the system is bringing in additional outside air, the
thermostat is reset 0 to 10° F (field-configured) above or be-
low 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
597
The TEMP system
The Comfort IAQ fea-
)
2
1 ⁄ minutes to end
2
14
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
information about this product.
IAQ SENSOR — To configure the IAQ sensor option, set
category 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 sensor is not used. The default is OFF.
IAQ ECONOMIZER DELAY — The IAQ Economizer De-
lay option controls how long the indoor fan will run before
the economizer is energized once in IAQ mode. To config-
ure the IAQ Economizer Delay option, set category 14, op-
tion 2. The number of minutes will be shown. The range of
acceptable values is 5 to 30 minutes in 1-minute increments.
Use the left set point buttons to set the time limit to the de-
sired value. The default value is 10 minutes.
IAQ MAXIMUM SPACE TEMPERATURE RESET — When
the IAQ mode brings in fresh outdoor air, the space tem-
perature will rise or fall depending on the outside-air tem-
perature. 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 Maxi-
mum Space Temperature option will keep the HVAC equip-
ment from entering heating or cooling unless the tempera-
ture 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
Humidity Lockout Set Point is the maximum outdoor air hu-
midity reading at which a zone will allow air to be brought
into the zone to satisfy IAQ requirements. The IAQ Humid-
ity Lockout Set Point option will keep the IAQ mode from
beginning unless the outdoor humidity is below acceptable
levels. The option is configured in category 14, option 4. The
set point can be configured from 0 to 100. The default value
is 0. The system relative humidity is broadcast by a device
(comfort controller) on the network.
→
IAQ LOW TEMPERATURE LOCKOUT — When the IAQ
mode brings in fresh outdoor air, the space temperature will
rise or fall depending on the outside-air temperature. The
IAQ Low Temperature Lockout Set Point is the minimum
outdoor-air temperature reading at which a zone will allow
air to be brought into the zone to satisfy IAQ requirements.
The IAQ Low Temperature Lockout Set Point option will
keep the IAQ mode from beginning unless the outdoor tem-
perature is above the set point. The option is configured in
category 14, option 5. The set point can be configured from
0 to 110 F. The default value is 45 F.
IAQ HIGH TEMPERATURE LOCKOUT — When the IAQ
mode brings in fresh outdoor air, the space temperature will
rise or fall depending on the outside air temperature. The
IAQ High Temperature Lockout Set Point is the maximum
outdoor-air temperature reading at which a zone will allow
air to be brought into the zone to satisfy IAQ requirements.
The IAQ High Temperature Lockout Set Point option will
keep the IAQ mode from beginning unless the outdoor tem-
perature is below the set point levels. The option is config-
ured in category 14, option 6. The set point can be config-
ured from 0 to 110 F. The default value is 80 F.
IAQ ALARM DELAY — The IAQ Alarm Delay option con-
trols how long the TEMP system thermostat will wait before
issuing an IAQ alarm. To configure the IAQ Alarm Delay
option, set category 14, option 7. The number of minutes