Microprocessor Controller for DOAS
14
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 min and max
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.
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 set
point as determined by the outside reset calculation.
s
upply
s
eT
p
oinT
This screen is active when supply temp control is selected or the active mode of
control. Displays current supply temperature and supply temperature set point to
be achieved.
e
conomizer
r
amp
The economizer ramp screen will be active if the unit is configured for economizer
control. This screen displays the economizer set point, supply air discharge
temperature, economizer ramp status, and economizer control mode. 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
set point, 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 set point is calculated based on the active set
point and the current space or return temperature. The calculated set point is
scaled between the supply temperature min and max set points determined by
the current mode of operation.
Unit Status Overview
