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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
Outside Air
Damper Limit
Heating
110°F (43°C)
0%
N/A
100°F (38°C)
100%
N/A
Cooling
48°F (9°C)
100%
100%
40°F (4.5°C)
0%
0% OA
Freeze protection (optional)
The unit shuts down when it receives a freezestat status.
Fan
The fan runs when the unit runs, unless safeties stop the fan. The fan runs at:
•
Low speed when the zone temperature is within setpoints
•
High speed when the zone temperature is outside of setpoints *
The fan runs for 5 minutes after the heating or cooling coils go inactive, to cool or dry the
coils.
* If using a single-speed fan, the fan runs when the unit runs, regardless of temperature.
Cooling
The Room Controller measures the zone temperature and stages the cooling to maintain
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.
Cooling is enabled when:
•
The unit is running, and
•
The fan status is on, and
•
The unit is not heating, and
•
The economizer (if enabled) is maintaining the zone temperature.
Heating
If staged heating is used, the Room Controller measures the zone temperature and turns
on the first and second stage heating (if available) as needed to maintain the heating
setpoint. A 5-minute delay between stages prevents short cycling, and each stage has a 1-
minute minimum on time and a 1-minute minute minimum off time.
If hot water heating is used, the Room Controller measures the zone temperature and
modulates the heating analog output to maintain the heating setpoint.
