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For an office project, we have cooling during February–November and heating during December–January. The system uses: a)4-coil AHU (water-based cooling coil + water-based heating coil connected to heat pump) b) Separate TFA unit with DX cooling coil, HRW, and prefilters c) Water-cooled chillers for cooling In DesignBuilder, we are modelling this by introducing the TFA components into a single AHU template, along with the water-based coils positioned before the fan. Cooling and heating schedules have been provided as per seasonal operation.

My questions: 1. Availability Schedules: Should the cooling coil and heating coil availability schedules inside the AHU be kept ON 24/7, or should they follow the same seasonal operation schedule as the cooling/heating mode?

1. Setpoint Managers: Do we need to switch the setpoint managers between cooling SAT and heating SAT according to the months (Feb–Nov for cooling, Dec–Jan for heating), or does DB handle this automatically?

For an office project, we have cooling during February–November and heating during December–January. The system uses: a)4-coil uses:

1. 4-coil AHU (water-based cooling coil + water-based heating coil connected to heat pump) b) pump)
2. Separate TFA unit with DX cooling coil, HRW, and prefilters c) prefilters
3. Water-cooled chillers for cooling cooling

In DesignBuilder, we are modelling this by introducing the TFA components into a single AHU template, along with the water-based coils positioned before the fan. Cooling and heating schedules have been provided as per seasonal operation.

My questions: 1. questions:

1. Availability Schedules: Schedules: Should the cooling coil and heating coil availability schedules inside the AHU be kept ON 24/7, or should they follow the same seasonal operation schedule as the cooling/heating mode?

   2. Setpoint Managers: Managers: Do we need to switch the setpoint managers between cooling SAT and heating SAT according to the months (Feb–Nov for cooling, Dec–Jan for heating), or does DB handle this automatically?

For an office project, we have cooling during February–November and heating during December–January. The system uses:

1. 4-coil AHU (water-based cooling coil + water-based heating coil connected to heat pump)
2. Separate TFA unit with DX cooling coil, HRW, and prefilters
3. Water-cooled chillers for cooling

In DesignBuilder, we are modelling this by introducing the TFA components into a single AHU template, along with the water-based coils positioned before the fan. Cooling and heating schedules have been provided as per seasonal operation.

My questions:

1. Availability Schedules: Should the cooling coil and heating coil availability schedules inside the AHU be kept ON 24/7, or should they follow the same seasonal operation schedule as the cooling/heating mode?

2. Setpoint Managers: Do we need to switch the setpoint managers between cooling SAT and heating SAT according to the months (Feb–Nov for cooling, Dec–Jan for heating), or does DB handle this automatically?