Orion System SA Controller - Manual (Page 48)

Zone
Zone
Programming
SA Controller Operator Interface 48
VAV/Zone Controller Setpoint Screens
VAV/Zone Controller Setpoints
Setpoint Screen #1 - Occupied Setpoints
XX Box Spts IDXXXX
Occupied Setpoints
Cooling.....: XXºF
Heating.....: XXºF
Enter the Occupied Cooling Setpoint as the maximum temperature
you would like the zone to reach before modulating the damper open
to bring in more cold air to cool the space. Enter the Occupied Heat-
ing Setpoint as the minimum temperature you would like the zone to
reach before activating the Reheat Stages on the optional Expansion
Relay board. If this is a Cooling Only box that doesn’t contain reheat,
this setpoint will be ignored.
Description Minimum Default Maximum
Cooling Setpoint 50ºF 74ºF 90ºF
Heating Setpoint 50ºF 70ºF 90ºF
Setpoint Screen #2 - Unoccupied Setbacks
XX Box Spts IDXXXX
Unoccupied Setbacks
Cooling SetUp: XXºF
Heating SetBk: XXºF
During unoccupied hours, the Occupied Cooling Setpoint is adjusted up
by the amount entered for the Cooling SetUp. The Occupied Heating Set-
point is adjusted down by the amount entered for the Heating SetBk.
Description Minimum Default Maximum
Cooling SetUp 0ºF +10ºF +30ºF
Heating SetBk 0ºF -10ºF -30ºF
Setpoint Screen #3 - AHU Heat Call Space Temp
XX Box Spts IDXXXX
AHU Heat Call
Space Temp...: XXºF
This setpoint allows you to set a Space Temperature that will cause the
VAV/Zone Controller to send a call for heat to the HVAC unit. This only
occurs in the Unoccupied Mode.
Description Minimum Default Maximum
AHU Heat Call Space Temp 50ºF 70ºF 90ºF
Setpoint Screen #4 - Damper Airfl ow Integral
XX Box Spts IDXXXX
Damper/Airflow Spt
Integral [Ki]..: XXX
The VAV/Zone Controller normally opens its damper based on a Pro-
portional Error from Setpoint. That means if the zone temperature is 4°F
from setpoint, the damper would be 100% open, or it would be modulat-
ing to provide the Maximum CFM on Pressure Independent boxes. If
the error is less than 4°F, the damper may stagnate at that position and
never satisfy the zone. If you add Integral into the damper calculation
process, this will cause the damper or airfl ow calculations to continue to
increase as long as the zone temperature is still above the setpoint. That
means it can provide 100% or Maximum CFM before the 4°F error is
achieved, bringing the zone under control faster than it normally would.
Start with a small (5 or 10) value, if you use this, and monitor the effect
it has. If you enter too large a value, you can create “hunting” situations
that can cause the damper actuator to prematurely wear out.
Description Minimum Default Maximum
Integral 0 0 100
Setpoint Screen #5 - Damper Airfl ow Max &
Vent Min
XX Box Spts IDXXXX
Damper/Airflow Spt
Maximum..: XXX %
Vent Min.: XXX %
The VAV/Zone Controller will not allow the damper or airfl ow calcula-
tion to exceed the Maximum setpoint while it is allowing the damper to
modulate. During Vent mode when there is no heating or cooling demand,
the damper or airfl ow will maintain at least the Vent Min amount of
airfl ow into the zone for ventilation.
Description Minimum Default Maximum
Maximum 0% or 0 CFM 100% or
1000 CFM
100% or
30000 CFM
Vent Min 0% or 0 CFM 25% or
250 CFM
100% or
30000 CFM