Greenheck DOAS v8.1 Reference Manual page 16

16 Microprocessor Controller for DOAS
Unit Status Overview
e v s
x TaTus
The ExV Status screen is active when the unit is equipped with an inverter
scroll compressor and electronic expansion valve (ExV). The screen displays
information from the EVD (electronic valve driver) including the number of steps
(stp) of the valve, the open percentage of the valve, the EVD control status,
the suction superheat, the suction temperature, the suction pressure, and the
saturated suction temperature. The second status screen also displays the
capacity of the circuit the valve is installed on and the discharge refrigerant
temperature for that circuit.
i c s
nverTer ompressor
The inverter compressor screen is active when an inverter scroll compressor is
installed in the unit. This screen displays information about the operation of the
inverter scroll starting with the requested capacity of the compressor compared
to its actual operating capacity. The requested capacity and the actual could
be different at startup and depending on where it is in the operating envelope.
The status of the compressor, current envelope zone and current refrigerant
temperatures and pressures are also displayed.
c F s
ondenser an TaTus
The pressure control status screen is active when a unit is equipped with active
head pressure control. This screen provides information regarding the outside fan
ramp status, circuits affected by the ramp, the status of the fans, the set point,
offset and current saturated temperature.
r c s
eFrigeranT ircuiT TaTus
The refrigerant circuit status screen is active when the unit is equipped with active
head pressure control. This screen provides temperatures and pressures for
suction and discharge sensors, when installed. Superheat is also displayed when
suction temperature and pressure sensors are installed.
h r
eaTing amp
This screen displays the active setpoint, supply air temperature, status of the
heating control ramp, and heating ramp being sent from the controller.
F s
urnace TaTus
This screen displays the status of the furnace(s) installed in the unit. One
modulating with up to two additional fixed stage furnaces will show the status
of each furnace. The status of each furnace tells what mode of operation the
furnace is currently in. The number of furnace stages on and the total number of
stages appear at the bottom of the screen.
d
ehumidiFicaTion
This screen will display the overall dehumidification status and selected
dehumidification control mode.
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.
TaTus