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DN-Series Integrated Programmable Controls
DOAS
SYSTEM MONITORING
UNIT STATUS CONDITIONS
STATUS SHOWN
MEANING
Unit on
The unit is on and running.
Unit switched off due to alarm
The unit is off by a serious alarm.
Unit switched off by BMS
The unit is off by command from the BMS.
Unit switched off by time band
The unit is off by the scheduler.
Unit switched off by digital input
The unit is off due to contacts across 17 and 18 open.
Unit switched off by local keypad The unit is off by the setting on the menu screen.
Exhaust Fan Only Mode
The unit is in single fan mode with exhaust fan running.
Supply Fan Only Mode
The unit is in single fan mode with supply fan running.
Unoccupied Mode
The unit is set to unoccupied mode.
Cool Locked Out by BMS
A BMS command has the cooling locked out.
Heat Locked Out by BMS
A BMS command has the heating locked out.
Device Test
The system is in device test mode for more than an hour.
Sens Ovrd Active
The system has a sensor overwritten for more than
24 hours.
The third screen shows:
u
Whether the unit is enabled. (See
Unit Status Conditions
in the first screen to assess why the
unit is not on).
u
Whether the OA and RA dampers are open—they should be open if the unit is ON and in
occupied mode, if applicable.
u
The status of the bypass damper which is used for economizer and frost control, if the
features are enabled.
u
Whether the recirculation damper is present. This was set in
Unit Configuration
. This damper
is optional, used for unoccupied operation.
If the CO2/VOC and/or duct pressure sensors were enabled and installed, their value and
setpoint are shown here.
12.4 FIELD-INSTALLED SENSOR SCREENS