Trane OABD OABE OADD OADE OAGD OAKD OAKE OAND OANE Catalog
18
OAU-PRC001E-EN
Application Considerations
Dehumidification
Consider
. If the outdoor air dew point is above the dehumidification setpoint, the
OAU will dehumidify the outdoor air. 100 percent outdoor air enters the OAU (h1). The unit filters,
cools and dehumidifies the air as it is drawn through the evaporator coils. Air leaves the evaporator
coils saturated at a preset dew point setpoint (h3). Since the dew point setpoint is fully adjustable,
the desired dew point condition is maintained at all load conditions.
cools and dehumidifies the air as it is drawn through the evaporator coils. Air leaves the evaporator
coils saturated at a preset dew point setpoint (h3). Since the dew point setpoint is fully adjustable,
the desired dew point condition is maintained at all load conditions.
Cooling or Heating
Consider
. If the outdoor air dew point is below the dehumidification setpoint, the
OAU will heat or cool the outdoor air to separate cooling or heating setpoints. 100 percent outdoor
air enters the OAU (t1 or t3). The unit filters and cools or heats the air as it is drawn through the
evaporators and heating section. The air leaves the OAU at the cooling or heating setpoint.
air enters the OAU (t1 or t3). The unit filters and cools or heats the air as it is drawn through the
evaporators and heating section. The air leaves the OAU at the cooling or heating setpoint.
Figure 7.
Refrigeration system diagram without reheat
Main Condenser
Main Evaporator
Expansion Valves
Compressors
Indoor Fan
Figure 8.
Psychrometric chart with dehumidification, no reheat
Dry Bulb Temperature
Dewpoint Temperature
Wet Bulb Temperature
Dehumidification
h1
h2
h3