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Zone setpoint adjust
The occupant can adjust the heating and cooling setpoints at the zone sensor.
Zone unoccupied override
The occupant can press a button to override the schedule and place the unit in occupied
mode for 30 minutes. Each additional press of the button adds 30 minutes, to a
maximum of 90 minutes. When the override time ends, the schedule controls the unit
again.
Discharge temperature limit control (optional)
The unit monitors the discharge temperature and limits the heating or cooling outputs as
follows:
Heating 110°F (43°C) 0%
100°F (38°C) 100%
Cooling 48°F (9°C) 100%
40°F (4.5°C) 0%
Freeze protection (optional)
The unit shuts down when it receives a freezestat status.
Smoke detection (optional)
The unit shuts down when it receives a smoke detector status.
Fan
The controller turns on the fan any time the unit is providing cooling. The controller does
not control the fan in heating mode, and the fan output DO3 (G) is off. Fan operation in
heating mode is controlled by third-party controls on the heating equipment. The timed
local override control will override this fan control, forcing the fan to run for the duration of
the override time (optional). To ensure the coils are not active when there is no airflow,
the fan starts one minute before cooling is enabled and runs for five minutes after cooling
turns off.
Fan status (optional)
The Room Controller monitors the fan status. It requires a positive fan status before
enabling any heating or cooling stages.
Cooling
If staged cooling is used, the Room Controller measures the zone temperature and turns
on the first and second stage cooling (if available) as needed to maintain the cooling
setpoint. A 5-minute delay between stages prevents short cycling, and each stage has a 2-
minute minimum on time and a 4-minute minimum off time.
If chilled water is used, the Room Controller measures the zone temperature and
modulates the chilled water valve to maintain the cooling setpoint.
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