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In the zone sizing object, Sizing:Zone, there is an input for the zone design outdoor air for rate. The PT unit in that zone, if it has an OA mixer, will size the outdoor air flow rate to meet the OA flow specified in the DesignSpecification:OutdoorAir object.

Sizing:Zone,
  WEST ZONE,               !- Zone or ZoneList Name
  SZ DSOA WEST ZONE,       !- Design Specification Outdoor Air Object Name

DesignSpecification:OutdoorAir,
  SZ DSOA WEST ZONE,       !- Name
  flow/person,             !- Outdoor Air Method
  0.00944,                 !- Outdoor Air Flow per Person {m3/s-person}
  0.0,                     !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
  0.0;                     !- Outdoor Air Flow per Zone {m3/s}

ZoneHVAC:PackagedTerminalHeatPump,
  Zone3PTHP,               !- Name
  FanAndCoilAvailSched,    !- Availability Schedule Name
  Zone3PTHPAirInletNode,   !- Air Inlet Node Name
  Zone3PTHPAirOutletNode,  !- Air Outlet Node Name
  OutdoorAir:Mixer,        !- Outdoor Air Mixer Object Type
  Zone3PTHPOAMixer,        !- Outdoor Air Mixer Name
  autosize,                !- Cooling Supply Air Flow Rate {m3/s}
  autosize,                !- Heating Supply Air Flow Rate {m3/s}
  autosize,                !- No Load Supply Air Flow Rate {m3/s}
  autosize,                !- Cooling Outdoor Air Flow Rate {m3/s}
  autosize,                !- Heating Outdoor Air Flow Rate {m3/s}
  autosize,                !- No Load Outdoor Air Flow Rate {m3/s}

In the zone sizing object, Sizing:Zone, there is an input for the zone design outdoor air for flow rate. The PT unit in that zone, if it has an OA mixer, will size the outdoor air flow rate to meet the OA flow specified in the DesignSpecification:OutdoorAir object.

Sizing:Zone,
  WEST ZONE,               !- Zone or ZoneList Name
  SZ DSOA WEST ZONE,       !- Design Specification Outdoor Air Object Name

DesignSpecification:OutdoorAir,
  SZ DSOA WEST ZONE,       !- Name
  flow/person,             !- Outdoor Air Method
  0.00944,                 !- Outdoor Air Flow per Person {m3/s-person}
  0.0,                     !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
  0.0;                     !- Outdoor Air Flow per Zone {m3/s}

ZoneHVAC:PackagedTerminalHeatPump,
  Zone3PTHP,               !- Name
  FanAndCoilAvailSched,    !- Availability Schedule Name
  Zone3PTHPAirInletNode,   !- Air Inlet Node Name
  Zone3PTHPAirOutletNode,  !- Air Outlet Node Name
  OutdoorAir:Mixer,        !- Outdoor Air Mixer Object Type
  Zone3PTHPOAMixer,        !- Outdoor Air Mixer Name
  autosize,                !- Cooling Supply Air Flow Rate {m3/s}
  autosize,                !- Heating Supply Air Flow Rate {m3/s}
  autosize,                !- No Load Supply Air Flow Rate {m3/s}
  autosize,                !- Cooling Outdoor Air Flow Rate {m3/s}
  autosize,                !- Heating Outdoor Air Flow Rate {m3/s}
  autosize,                !- No Load Outdoor Air Flow Rate {m3/s}