Microprocessor Controller for DOAS 17
®
COOLING RAMP
This screen displays the active setpoint, supply discharge temperature, cooling
enable/disable, cooling ramp being sent from the controller, and the overall
capacity being demanded.
COMPRESSOR REQUEST
The compressor request screen will be active if the unit is equipped with DX
cooling. Screen displays overall status of individual compressor operation being
sent from the unit controller. Example: Circuit A compressor enable (On) with
modulating value of 26%.
HEATING RAMP
This screen displays the active setpoint, supply air temperature, heating enable/
disable, and heating ramp being sent from the controller.
DEHUMIDIFICATION
This screen will display the overall dehumidification status and selected mode of
dehumidification control.
The following dehumidification modes are available when the space is in occupied
mode:
• Cold coil setpoint plus offset (10ºF)
• Inside RH*
• Inside dew point*
• Outside dew point
• Inside RH or inside dew point*
• Inside RH or inside dew point or outside dew point
• Inside RH and inside dew point*
• Inside RH and inside dew point or outside dew point
*Available during unoccupied mode.
HGRH RAMP OUTPUT
This screen will display overall hot gas reheat status which includes active
setpoint, supply air discharge temperature, hot gas reheat enable/disable, and hot
gas reheat control loop being sent from the controller.
SUPPLY SPACE STATIC
This screen displays status points if the unit is configured for space static
pressure control. Status points include controller output ramp, static pressure
in the space, and the space static pressure setpoint. Similar status screen will
appear for the exhaust fan if the unit is configured for exhaust fan space static
control.
SUPPLY/RETURN DUCT STATIC
This screen displays status points if the unit is configured for duct static pressure
control. Status points include controller output ramp, static pressure in the duct,
and the duct static pressure setpoint. Similar status screen will appear for the
exhaust fan if the unit is configured for exhaust fan duct static control.
DEFROST RAMP OUTPUT
This screen only appears if the unit has an energy recovery wheel and a frost
control method was provided on the unit.
Upon sensing a high differential pressure across the energy wheel, the unit will
go into defrost if the outside air temperature is below the defrost temperature
setpoint.
Unit Status Overview
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