I am setting up a PackagedTerminalAirConditioner to run on constant fan during the day and cycle the fan at night. The system also provides outside air and looking to close the outside air dampers when the fan cycles at night. How could I achieve this?
The setup I have below does cycle the fan at night but also brings in outside air during night fan cycling.
ZoneHVAC:PackagedTerminalAirConditioner,
zone1 PTAC, ! Component name
On 24/7, ! Availability schedule
zone1 PTAC Return, ! Air inlet node to heat pump; also a zone exhaust node
zone1 PTAC Supply Inlet, ! Air outlet node to heat pump; also a zone inlet node
OutdoorAir:Mixer, ! Outdoor air mixer object type
zone1 PTAC Outdoor Air Mixer,! Outdoor air mixer name
autosize, ! Supply air flow rate during cooling operation (m3/s)
autosize, ! Supply air flow rate during heating operation (m3/s)
autosize, ! Supply air flow rate when no heating or cooling is needed (m3/s)
autosize, ! Outdoor air flow rate during cooling operation (m3/s)
autosize, ! Outdoor air flow rate during heating operation (m3/s)
autosize, ! Outdoor air flow rate when no heating or cooling is needed (m3/s)
Fan:OnOff, ! Type of supply fan
zone1 PTAC Supply Fan, ! Name of supply fan
Coil:Heating:Gas, ! Type of heating coil
zone1 PTAC Heating Coil, ! Name of heating coil
Coil:Cooling:DX:SingleSpeed, ! Type of cooling coil
zone1 PTAC DX Cooling Coil, ! Name of cooling coil
DrawThrough, ! Fan placement
Fan cycle mode sch; ! Supply air fan operating mode schedule
Schedule:Compact,Fan cycle mode sch,
on/off,
Through: 12/31,
For: Weekdays SummerDesignDay,
Until: 06:00,0.0,
Until: 20:00,1.0,
Until: 24:00,0.0,
For: Saturday WinterDesignDay,
Until: 06:00,0.0,
Until: 18:00,1.0,
Until: 24:00,0.0,
For: Sunday Holidays AllOtherDays,
Until: 24:00,0.0;
