Microprocessor Controller for DOAS
13
Unit Status Overview
The microprocessor controller will revert to a default main menu loop. This loop includes several screens to view the
operating conditions of the unit. Scroll through the menu screens by using the
buttons.
Unit Status Screen Symbols
Symbol
Indicates
Supply air fan status.
Rotation indicates airflow; static blades indicate no airflow.
Cooling
Heating
Dehumidifying
Economizing
Defrost
T
he
iniTial
menu
screen
displays
The
job
name
,
uniT
Tag
,
uniT
sTaTus
,
ouTside
air
condiTions
,
space
condiTions
and
seT
poinTs
.
Possible modes include:
• Off/Standby
• Unoccupied Start
• Dampers Open
• Fan Start Delay
• Fans Starting
• Startup Delay
• System On
• Soft Shutdown
• System Disabled
• Remote Off
• Shutdown Alarm
• Fans Only
• Economizing
• Cooling
• Dehumidifying
• Heating
• HGRH Purging
• Defrost Active
• Overrides Active
• Expansion Offline
i
npuT
o
uTpuT
s
TaTus
Displays real time conditions from sensors located in the unit and building space
if equipped with space mounted sensors. Controller output conditions can also
be viewed from this screen. To view the desired input/output point, the user must
select the desired channel. Reference the Controller Overview section in this
manual for individual point locations.
o
ccupancy
s
TaTus
Displays current status of occupancy and the configured occupancy control
method and time zone.
s
upply
F
an
s
TaTus
This screen displays the fan enable command, fan proving status, and the supply
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.
d
amper
c
ommanded
p
os
This screen appears if equipped with modulating OA and recirculated air
dampers. Displays current position of the OA damper.
abb F
an
1 s
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.
