Microprocessor Controller for DOAS
16
®
E
XHAUST
F
AN
S
TATUS
This screen displays the fan enable command, fan proving status, and the
exhaust fan ramp being sent from the controller to the VFD. The minimum and
maximum speeds are set in the VFD (Reference unit Installation and Operation
Manual for VFD programming). The controller can modulate the fan between the
min and max speeds via an analog output.
A
IRFLOW
S
TATUS
This screen displays the current status of airflow volumes if the unit is provided
with airflow monitoring.
A
MBIENT
L
OCKOUT
S
TATUS
Displays heating and cooling lockout status based on the outside air ambient
temperature. Ambient lockouts for heating and cooling can be altered by entering
Main Menu/Ctrl Variables/Temp Control/Cooling or Heating.
O
UTSIDE
R
ESET
This screen will be active if the controller is configured for outside air reset. The
heating and cooling devices modulate to maintain the supply air temperature
setpoint as determined by the outside reset calculation.
S
UPPLY
S
ETPOINT
Displays current supply temperature and supply temperature setpoint to be
achieved.
E
CONOMIZER
R
AMP
The economizer ramp screen will be active if the unit is configured for an
economizer control method. This screen displays the economizer setpoint, supply
air discharge temperature, economizer ramp status, and economizer control
mode of control. Economizer control mode options include, outside dry bulb,
outside enthalpy, comparative dry bulb, and comparative enthalpy.
CO
2
R
AMP
O
UTPUT
The CO
2
Ramp Output screen will be active if the unit is configured for CO
2
control. This screen displays the CO
2
setpoint, CO
2
level from the space, and the
status of the control ramp.
E
NERGY
R
ECOVERY
W
HEEL
S
TATUS
This screen provides overall status of the energy recovery wheel.
A
CTIVE
R
ESET
This screen will be active if temperature control mode is set for space or return air
reset. The supply temperature setpoint is calculated based on the active setpoint
and the current space or return temperature. The calculated setpoint is scaled
between the supply temperature minimum and maximum setpoints determined by
the current mode of operation.
Unit Status Overview
