VAV/ZONE CONFIGURATION
VCC-X Operator Interface SD
77
Setpoint Screen #8 - Damper Air
fl
ow Night Min
and Fan On Min
XX Box Spts IDXXXX
Damper/Airflow Spt
Night Min.: XXX %
Fan On Min.:
XXX %
The Night Min position is the position the damper will move to
when the system is in Pushbutton Override Mode and this particular
damper is not part of that Override Group. When not in Pushbutton
Override, pressure independent boxes will only go to the Night Min
CFM setpoint position if it is set to 0. Pressure dependent boxes will
always stay at the Night Min position. This Night Min position only
affects non fan powered boxes. The Fan On Min is the minimum
damper or air
fl
ow setting used to activate the parallel fan if installed.
Pressure Independent = CFM. Pressure Dependent = %.
Description
Minimum
Default
Maximum
Night Min
0% or
0 CFM
0% or
0 CFM
100% or
9999 CFM
Fan On Min
0% or
0 CFM
25% or
250 CFM
100% or
9999 CFM
Setpoint Screen #9 - Damper Air
fl
ow Reheat Min
XX Box Spts IDXXXX
Damper/Airflow Spt
Reheat Min.: XXX %
The Reheat Min is the damper or air
fl
ow setting used during the
Space Reheat Mode of operation.
Description
Minimum
Default
Maximum
Reheat Min
0% or
0 CFM
0% or
0 CFM
100% or
30000 CFM
Setpoint Screen #10 - Damper Air
fl
ow Fixed
Position
XX Box Spts IDXXXX
Damper/Airflow Spt
Fixed Pos: XXX %
Many times while troubleshooting a system, it is useful to have the
zone damper set to a speci
fi
c damper position or air
fl
ow setting. This
setpoint can be used to determine where the damper/air
fl
ow will
remain when the VAV/Zone Controller receives a
Force to Fixed
Position
command.
Description
Minimum
Default
Maximum
Fixed Pos
0% or
0 CFM
0% or
0 CFM
100% or
9999 CFM
Setpoint Screen #11 - SAT HVAC Mode
Deadband
XX Box Spts IDXXXX
SAT HVAC Mode
Deadband.: XX
º
F
If the supply air temperature is above the space temperature by this
amount, the VAV/Zone controller enters the Supply Air Heating
Mode. It will remain in the Supply Air Heating Mode until the supply
air drops to 2ºF above the space temperature. At that point the unit
enters the Supply Air Vent Mode and remains there until the supply
air drops this deadband below the space temperature. At that point
the VAV/Zone Controller enters the Supply Air Cooling Mode and
will remain there until the supply air temperature rises to 2ºF below
the space temperature.
Description
Minimum
Default
Maximum
SAT HVAC Mode
Deadband
0ºF
10ºF
20ºF
Setpoint Screen #12 - Zone Alarm Offsets
XX Box Spts IDXXXX
Zone Alarm Offsets
Hi Zone......: XX
º
F
Lo Zone......: XX
º
F
The VAV/Zone Controller can be setup to generate an alarm anytime
the box goes into the Occupied Mode and the Zone Temperature ex-
ceeds the user-de
fi
ned alarm limits for a user-de
fi
ned period of time.
A
High Temperature Alarm Setpoint
is created by adding the
Hi Zone
Alarm
offset to the current
Cooling Setpoint
. The
Low Temperature
Alarm Setpoint
is created by adding the
Lo Zone Alarm
offset to the
current
Heating Setpoint
. If the zone temperature exceeds either of
these limits for a period de
fi
ned by the
Alarm Delay
setpoint, the
controller can generate an alarm callout if all the optional hardware
components required for this to occur are installed.
Description
Minimum
Default
Maximum
Hi Zone Alarm
+1ºF
+30ºF
+50ºF
Lo Zone Alarm
-1ºF
-30ºF
-50ºF
VAV/Zone Setpoint Screens
