The following sections outline the operation details.
BI input
With a BI occupied command the supply fan turns on for a 5-minute stabilization period and then operating space temperature is compared to the morning warm-up return air temperature setpoint.
If the value is equal to or below the morning warm-up return air temperature setpoint, all heat stages operate for at least 5 minutes. If the value is above the morning warm-up return air temperature setpoint, the control goes into occupied mode.
The heat stages energize until 5 minutes pass and the operating space temperature is below the morning warm-up setpoint or the early start period expires. Then the control goes into occupied mode.
Optimal start
Historical data determines when the optimal start begins. The optimal start time is always within the same calendar day. All heating stages run until the demand is satisfied. The control uses the operational VAV heating setpoint to determine when the demand is satisfied. Then the control goes into occupied mode.
Schedule
At the early start period before the scheduled occupancy, the supply fan turns on for a 5-minute stabilization period and then the operating space temperature is compared to the morning warm-up return air temperature setpoint.
If the value is equal to or below the morning warm-up return air temperature setpoint, all heating stages operate for at least 5-minutes. If the value is above the morning warm-up return air temperature setpoint, the control goes into occupied mode.