Trane OABD OABE OADD OADE OAGD OAKD OAKE OAND OANE Catalog
16
OAU-PRC001E-EN
Application Considerations
Horizon OAU Operation
The Horizon™ OAU can use either DX cooling, condenser reheat, electric or gas heat to condition
outdoor air. The unit controls modulate cooling and heating capacity, reducing the supply air
temperature swings associated with staged heating and cooling.
outdoor air. The unit controls modulate cooling and heating capacity, reducing the supply air
temperature swings associated with staged heating and cooling.
OAU with Reheat
shows the OAU system with a DX refrigerant circuit design using reheat.
Dehumidification
. If the outdoor air dew point is above the dehumidification setpoint (or in
the case of zone control, the zone RH is above the RH setpoint), the OAU will:
•
cool the outdoor air to remove required moisture and
•
reheat to meet the discharge temperature setpoint.
Figure 3.
Indirect discharge to fan-coil units
Figure 4.
Refrigeration system diagram with reheat
Main Condenser
Reheat Coil
Main Evaporator
Expansion Valves
Compressors
Indoor Fan