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Run conditions - scheduled
User-defined schedules determine when the unit runs in:
•
Occupied Mode
The unit maintains a 74°F (23.5°C) adjustable cooling setpoint and a 70°F (21°C)
adjustable heating setpoint.
•
Unoccupied Mode (night setback)
The unit maintains an 85°F (29.5°C) adjustable cooling setpoint and a 55°F (13°C)
adjustable heating setpoint.
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:
Mode
Discharge
Temperature
Capacity Limit
Heating
110°F (43°C)
0%
100°F (38°C)
100%
Cooling
48°F (9°C)
100%
40°F (4.5°C)
0%
Fan
The fan runs any time the unit is providing heating or cooling. 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 1
minute before heating or cooling is enabled and runs for 5 minutes after heating or
cooling turns off.
Heating and cooling - 2 compressor stages
The Room Controller measures the zone temperature and stages the compressors to
maintain 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. The
compressor runs subject to its internal safeties and controls.
Heating is enabled when:
•
The zone temperature is below the heating setpoint, and
•
The fan status is on, and
•
The reversing valve is in heat mode.
Sequence of
operation