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

will be shown. The range of acceptable values is 0 to 240
minutes in 1-minute increments. Use the left set point but-
tons to set the time limit to the desired value. The default
value is 0 minutes.
Fan/Filter Status Switch —
can be configured to signal when the system fan is operating
or 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.
CONTROL OF HEATING AND
COOLING EQUIPMENT
The system heating and cooling equipment is operated by
the TEMP system thermostat in response to the zone con-
ditions. 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 deter-
mine the equipment staging.
To protect the equipment, the TEMP system thermostat
utilizes a time guard function to prevent excessive equip-
ment cycling. To prevent excessive temperatures, the TEMP
system thermostat can deenergize stages of equipment op-
eration based on a comparison of supply-air temperatures to
system operating limits which will turn off equipment. The
TEMP system thermostat can also lockout heating or cool-
ing based on outside air temperature.
Heating/Cooling Equipment Interface —
heating/cooling equipment is interfaced to the TEMP sys-
tem 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. 10. 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 sys-
tem thermostat 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
The fan/filter status switch
The system switches are located
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 mechanical heat switch setting). When the option is set
to 2, the thermostat 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 thermo-
stat 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 thermostat is able to select system cool mode.
To control the cool switch setting, configure category 4,
option 19. These range is from 0 to 2. When the option is set
to 0, the thermostat will use the setting of the mechanical
cool switch. When the option is set to 1, the thermostat will
perform as if the cool switch is set to AUTO (regardless of
the mechanical cool switch setting). When the option is set
to 2, the thermostat will perform is if the cool switch is set
to OFF (regardless of the mechanical cool switch setting).
The setting of 0, is the default setting.
Fan Switch —
of the TEMP system thermostat. The fan switch controls the
system fan operation. See Fig. 10.
When the fan switch is set to ON, the TEMP system ther-
mostat energizes the fan relay continuously when the TEMP
system thermostat is in occupied mode. The fan does not
operate in unoccupied mode.
NOTE: When the TEMP system thermostat is in unoccupied
override mode, the fan operates as if it is in occupied mode.
When the fan switch is set to AUTO, the TEMP system
thermostat energizes the fan relay only during the system
heating or system cooling modes.
To control the fan switch setting, configure category 4,
option 18. These range is from 0 to 2. When the option is set
to 0, the thermostat will use the setting of its mechanical fan
switch. When the option is set to 1, the thermostat will per-
form as if the fan switch is set to ON (regardless of the me-
chanical fan switch setting). When the option is set to 2, the
thermostat will perform is if the fan switch is set to AUTO
(regardless of the mechanical fan switch setting). The set-
ting of 0 is the default setting.
The
Fig. 10 — System Switch Locations
15
The fan switch is located on the bottom