Orion System VAV II Controller v.1 - Manual (Page 58)

VAV/ZONE CONTROLLER PROGRAMMING
VAV/CAV/MUA Operator Interface SD 58
VAV/Zone Setpoint Screens
Setpoint Screen #8 - Damper Airfl ow Night Min
and Fan On Min
XX Box Spts IDXXXX
Damper/Airflow Spt
Night Min.: XXX %
Fan On Min.:
XXX %
The Night Min is the position the damper will move to when the sys-
tem is in Override Mode and this particular damper is not part of the
override group. This Night Min position only affects non-fan powered
boxes. The Fan On Min is the minimum damper or airfl 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
30000 CFM
Fan On Min 0% or
0 CFM
25% or
250 CFM
100% or
30000 CFM
Setpoint Screen #9 - Damper Airfl ow Reheat Min
XX Box Spts IDXXXX
Damper/Airflow Spt
Reheat Min.: XXX %
The Reheat Min is the damper or airfl 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 Airfl 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 specifi c damper position or airfl ow setting. This setpoint
can be used to determine where the damper/airfl 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
30000 CFM
Setpoint Screen #11 - SAT HVAC Mode
Deadband
XX Box Spts IDXXXX
SAT HVAC Mode
Deadband.: XXºF
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......: XXºF
Lo Zone......: XXºF
The VAV/Zone Controller can be setup to generate an alarm anytime the
box goes into the Occupied Mode and the Zone Temperature exceeds
the user-defi ned alarm limits for a user-defi 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 defi ned by the Alarm Delay setpoint, the controller can gen-
erate 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
Setpoint Screen #13 - Zone Alarm Delay
XX Box Spts IDXXXX
Zone Alarm Delay
Must Be Out Of
Limits For.: XXX Min
As mentioned above, if you confi gure the controller to generate zone
temperature alarms, this is the amount of time after the box goes into the
Occupied Mode that the temperature must be outside the alarm limits
before an alarm is generated.