Specifications

ManualsBrandsCarrier ManualsConsumer electronicsCARRIER COMFORT SYSTEM 33CS

LOCAL ZONE IAQ PROBLEM — When the monitor ther-

mostat scans the bus to gather information to operate the sys-

tem it also gathers the IAQ status of the associated zone

controller and bypass. When a zone controller gives the moni-

tor thermostat the Zone In IAQ ﬂag, the monitor turns on the

fan. If the IAQ Economizer Delay times out and one of its

zones still has an IAQ problem the monitor will qualify hu-

midity and outside air temperature against its lockout set points

and energize it economizer relay as long as humidity and

outdoor air are acceptable. When the Zone In IAQ either sat-

isﬁes or reaches its reset temperature it will not send the moni-

tor thermostat the Zone In IAQ ﬂag and the monitor ther-

mostat will deenergize the economizer relay. It will also

deenergize the fan if the fan switch is in AUTO and there is

no mode or all of its zones are in the Unoccupied mode and

there is no mode.

SYSTEM IAQ PROBLEM — When the monitor thermostat

gets a system IAQ ﬂag from the bypass or its local IAQ sen-

sor alarms in the Monitor-Only operation, it starts the Sys-

tem IAQ mode. First the monitor gives all of the zone con-

trollers the system IAQ ﬂag. The zone controllers then look

at their system IAQ option to determine if they are going to

participate in the system IAQ mode, if not, they will not send

the monitor the Zone In IAQ ﬂag. If the System IAQ option

is on in each zone controller then the zone controllers will

look at their Reset Temperature window to determine if they

can do System IAQ. If the zone controllers are within their

reset window they will give the monitor the Zone In IAQ

ﬂag and position their dampers at the maximum damper po-

sition. If the IAQ economizer delay times out and one of its

zones still has the Zone In IAQ ﬂag active the monitor will

qualify humidity and outside air temperature against its lock-

out set points and energize its economizer relay as long as

humidity and outside air are acceptable. When the last Zone

In IAQ reaches its reset temperature or the system IAQ sen-

sor satisﬁes, the monitor will deenergize the economizer re-

lay. It will also deenergize the fan if the fan switch is in AUTO

and there is no mode or all of its zones are in the unoccupied

mode and there is no mode. The damper modulation for the

monitor’s zone is identical to the zone controller’s. When

the monitor has a System IAQ trip it will look at the system

mode and if the mode matches zone demand its zone will

participate in the System IAQ mode. If the system mode does

not match zone demand, it will use the Reset window. If the

Reset window check fails the monitor will look at duct tem-

perature and if the duct temperature will improve its space

conditions it will participate in the System IAQ mode.

IAQ ECONOMIZER DELAY — The IAQ Economizer

Delay option controls how long the indoor fan will run

before the economizer is energized. With a Carrier integrated

economizer, the outside-air damper will go to the minimum

damper position whenever the fan is energized. If the moni-

tor thermostat is still receiving a Zone In IAQ ﬂag after the

IAQ economizer delay has been timed out, the monitor ther-

mostat will energize the auxiliary (AUX) relay (economizer

relay). To conﬁgure the IAQ Economizer Delay option, set

category 14, option 3. 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 desired 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 Zone 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 Temperature 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 4. 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 rela-

tive humidity reading at which a zone will allow air to be

brought into the zone to satisfy IAQ requirements. The IAQ

Humidity Lockout Set Point option will keep the IAQ mode

from beginning unless the outdoor humidity is below ac-

ceptable levels. The option is conﬁgured in category 14, op-

tion 5. The set point can be conﬁgured from 0 to 100. The

default value is 0. The system relative humidity must be broad-

cast 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 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 tempera-

ture is above the set point. The option is conﬁgured in

category 14, option 6. 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. The option is conﬁgured in

category 14, option 7. The set point can be conﬁgured from

0 to 110 F. The default value is 80 F.

IAQ ALARM DELAY — The IAQ Alarm Delay option con-

trols how long the monitor thermostat will wait before is-

suing an IAQ alarm. To conﬁgure the IAQ Alarm Delay op-

tion, set category 14, option 8. 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.

NOTE: The alarm is issued only after the local IAQ alarm

is active for the entire alarm delay.

Fan/Filter Status Switch — The fan/ﬁlter status switch

can be conﬁgured to signal when the system fan is operating

or to monitor the HVAC equipment ﬁlter and send a dirty

ﬁlter alarm.

NOTE: The humidity sensor and fan/ﬁlter status sensor can-

not be wired at the same time, only one sensor can be used.

To conﬁgure to monitor thermostat to use a fan/ﬁlter sta-

tus switch, set category 5, option 11. A value of 0 conﬁgures

the system for no sensor. A value of 1 conﬁgures the system

for an indoor humidity sensor. A value of 2 conﬁgures the

system for a fan/ﬁlter status switch. The default is 0.

Category 5, option 10 conﬁgures whether the fan status or

ﬁlter status capability of the sensor is used. Set the option to

ON for a fan status switch. Set the option to OFF for a ﬁlter

status switch. The default is OFF.

Refer to the fan/ﬁlter status installation instructions for

more information.