Greenheck DOAS v8.1 Reference Manual page 14

14 Microprocessor Controller for DOAS
Unit Status Overview
abb F 1 s
an TaTus
This screen appears if equipped with a Modbus controlled VFD. This screen
displays the fan speed, current, torque, bus voltage, output voltage and power
consumption being sent form the VFD to the controller.
e F s
xhausT an 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 controller can
modulate the fan between the min and max speeds.
a s
irFlow TaTus
This screen displays the current status of airflow volumes if the unit is provided
with airflow monitoring. Supply Fan, Exhaust Fan, and Outside Air airflow are
optional monitoring sensors that will appear when installed.
a l s
mbienT ockouT TaTus
Displays the lockout status for heating, cooling, economizing, preheat, and heat
pump heating based on the outside air ambient temperature. Ambient lockouts
for heating and cooling can be altered by entering Main Menu/Ctrl Variables/Temp
Control.
o r
uTside 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.
a r
cTive 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 min and max setpoints determined by the
current mode of operation.
s s
upply eTpoinT
This screen is active when supply temp control is selected or the active mode of
control. Displays current supply temperature and supply temperature setpoint to
be achieved.
e r
conomizer amp
The economizer ramp screen will be active if the unit is configured for economizer
control. This screen displays the economizer setpoint, 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.
c h
ase eaT
When the unit is off or in standby, the hot water valve will be modulated to
maintain the case temperature to the case heat setpoint.