Sensors; Fan/Filter Status Switch; Control Of Heating And Cooling; Equipment - Carrier 33CS Installation, Service, And Troubleshooting Instructions

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 sys-
tem relative humidity is broadcast by a device (comfort con-
troller) 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 temperature 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 temperature is below
the set point levels. The option is configured in category 14,
option 6. 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 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 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.
Fan/Filter Status Switch —
switch can be configured to signal when the system fan is oper-
ating or monitor the HVAC equipment filter and send a dirty
filter alarm.
NOTE: The humidity sensor and fan/filter status sensor cannot
be wired at the same time, only one sensor can be used.
To configure to monitor thermostat to use a fan/filter status
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 sta-
tus switch. The default is OFF.
Refer to the fan/filter status installation instructions for
more information.
CONTROL OF HEATING AND
COOLING EQUIPMENT
The system heating and cooling equipment is operated by
the TEMP system thermostat in response to the zone condi-
tions. The TEMP system thermostat uses the System Mode to
determine the zone requirements of the system.
The TEMP system thermostat can control the heating or
cooling stages of the equipment and an economizer (if
applicable).
During equipment operation, zone temperature conditions
can be improving, staying the same, or becoming worse. The
TEMP system thermostat can analyze conditions to determine
the equipment staging.
The fan/filter status
To protect the equipment, the TEMP system thermostat
utilizes a time guard function to prevent excessive equipment
cycling. To prevent excessive temperatures, the TEMP system
thermostat can deenergize stages of equipment operation based
on a comparison of supply-air temperatures to system operat-
ing limits which will turn off equipment. The TEMP system
thermostat can also lockout heating or cooling based on
outside-air temperature.
Heating/Cooling Equipment Interface —
heating/cooling equipment is interfaced to the TEMP system
thermostat through a single zone relay pack.
Through the relay pack, the TEMP system thermostat is
able to control:
• 2 stages of cooling
• 2 stages of heating
• fan operation
• reversing valve operation/ auxiliary relay operation
System Switches —
on the bottom of the TEMP system thermostat. The system
switches control the system mode function. See Fig. 11. The
system switches can be set to a fixed position (locked) through
configuration and can also be controlled from the network
through software.
SYSTEM HEAT SWITCH — The TEMP system thermostat
heat switch has 2 settings. When the heat switch is set to OFF,
the TEMP system thermostat cannot select system heat mode.
When the heat switch is set to AUTO, the TEMP system ther-
mostat is able to select system heat mode.
To control the heat switch setting, configure category 4,
option 20. This range is from 0 to 2. When the option is set to 0,
the thermostat will use the setting of its mechanical cool
switch. When the option is set to 1, the thermostat will perform
as if the heat switch is set to AUTO (regardless of the mechani-
cal heat switch setting). When the option is set to 2, the thermo-
stat will perform is if the heat switch is set to OFF (regardless
of the mechanical heat switch setting). The setting of 0 is the
default setting.
SYSTEM COOL SWITCH — The TEMP system thermostat
cool switch has 2 settings. When the cool switch is set to OFF,
the TEMP system thermostat cannot select system cool mode.
When the cool switch is set to AUTO, the TEMP system ther-
mostat is able to select system cool mode.
COOL HEAT
SYSTEM
SWITCHES
Fig. 11 — System Switch Locations
15
The system switches are located
TEMP SYSTEM
THERMOSTAT
COOL HEAT FAN
OFF AUTO OFF AUTO ON
The
FAN
SWITCH