Daikin Rebel DPS Series Installation And Maintenance Manual page 41

Figure 45: Ideal for Neutral Air Ventilation Control
• The rooftop mainly dehumidifies the required ventilation air
• Terminal units provide additional sensible cooling as required
Dehumidification Initiation
An analog sensor is mounted in the return duct, the space, or
outdoors to sense Relative Humidity. The location is selected
by setting the Sensor Location value on the keypad to Return,
Space, or OAT. OAT can only be selected for units with DAT
control. Dehumidification is disabled when the unit is in either
the Heating or Minimum DAT state. When Dehumidification is
enabled, Dehumidification operation is initiated when Humidity
Control is set to either Relative Humidity or Dew Point and
that value rises above the appropriate setpoint by more than
half its deadband. Economizer operation is disabled in the
Dehumidification mode so the unit immediately transitions to
Cooling if Dehumidification is initiated in Economizer state.
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Optional Modulating Hot Gas Reheat
Dehumidification Termination
Dehumidification is terminated if the selected variable, Relative
Humidity or Dew Point, drops below the appropriate humidity
setpoint by more than half its deadband. Dehumidification is
also terminated if cooling is disabled for any reason or the unit
enters either the Heating or Minimum DAT state. For units with
compressors, the number of cooling stages is reduced by one
and control reverts to normal control when dehumidification
is terminated in the Cooling state. Another compressor stage
change could then occur after one Cooling Stage Time has
elapsed .
41 IM 1125-13 • REBEL ROOFTOPS