Specifications
Indoor Air Humidity Sensor — The monitor ther-
mostat measures relative humidity through a solid-state hu-
midity sensor. The sensor can be located up to 500 ft from
the single zone relay pack or zone damper actuator. The sen-
sor measures zone humidity with a range of 0 to 100%.
When the monitor thermostat is configured as a Monitor
Only thermostat, the humidity sensor is interfaced through
the single zone relay pack. See Fig. 27.
When the monitor thermostat is configured as a VVTt
Monitor thermostat, the humidity sensor is interfaced through
the printed circuit board in the zone damper actuator. See
Fig. 28.
When the Humidity Sensor option is set to ON, the moni-
tor thermostat will measure zone relative humidity.
When the Humidity Sensor option is set to OFF, the moni-
tor thermostat will not measure indoor humidity.
To configure the Humidity Sensor option, configure cat-
egory 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
cannot be used at the same time.
HUMIDITY SENSOR CALIBRATION — To calibrate the
local humidity sensor, configure category 5, option 12. Ob-
tain a correct humidity reading with an accurate psychrom-
eter. 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 Function — The Comfort IAQ
feature 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 sen-
sor (CO
2
) is used to monitor the IAQ levels in the return air
duct.
When the CO
2
level exceeds the preset level (factory con-
figuration is 1000 ppm and cannot be changed without op-
tional software), the sensor signals the monitor thermostat.
The monitor thermostat energizes the indoor-fan motor (if
not already running). If the Auxiliary Relay has been con-
figured for IAQ operation, the monitor thermostat energizes
the relay after a pre-configured delay. This is intended for
use with an economizer, but can be wired to an exhaust fan
or HRV (Heat Recovery Ventilator).
The monitor has 3 lockout features which will prevent IAQ
mode if the outdoor humidity is too high or the outdoor tem-
perature is too high or too low. See the IAQ Humidity Lock-
out Set Point, the IAQ Low Temperature Lockout, and the
IAQ High Temperature Lockout sections on page 24, for fur-
ther details.
An IAQ problem is defined in the VVT system as either
a local zone IAQ problem or a system IAQ problem. A local
zone IAQ problem occurs when a zone controller has an IAQ
sensor attached to it and it receives an alarm. A system IAQ
problem occurs when a bypass controller gives the monitor
thermostat the system IAQ mode or, in the case of Monitor-
only mode, operates its own local IAQ sensor trips.
The difference between VVT Monitor operation and
Monitor-only operation is that if the monitor thermostat is
controlling a damper there is no place to wire/connect the
IAQ sensor. The bypass controller has extra input points so
one can connect the system IAQ sensor to it when the moni-
tor thermostat is controlling a damper. The Monitor-only de-
vice is connected to a TSR-01, TRS-01W, or 33CSSUCE-06
relay pack that has enough input ports to accommodate an
IAQ sensor.
IAQ SENSOR CALIBRATION — IAQ sensor calibration
can only be done with special calibration software which must
be purchased separately. Call a local Carrier representative
for more information about this product.
SYSTEM IAQ PARTICIPATION — The system IAQ par-
ticipation option tells the monitor thermostat whether a zone
will or will not participate in the IAQ mode if the monitor
thermostat is controlling a damper. To configure the System
IAQ Participation option, set category 14, option 1. When
the option is configured ON, the monitor thermostat will par-
ticipate in IAQ system operation. When the option is con-
figured OFF, the monitor thermostat will not enter system
IAQ mode. The default is ON.
LOCAL IAQ SENSOR — To configure the IAQ sensor op-
tion, set category 14, option 2. When the option is config-
ured ON, the monitor thermostat (monitor-only mode) will
use information from the IAQ sensor wired to the relay pack.
When the option is configured OFF, the IAQ sensor is not
used. The default is OFF.
Fig. 27 — Indoor Air Humidity Sensor Wiring
(Monitor Only Configuration)
Fig. 28 — Indoor Air Humidity Sensor Wiring
(VVT Monitor Configuration)
23