Orion System VCM-X/RNE Operator Interfaces - Manual (Page 60)

VAV/ZONE CONTROLLER PROGRAMMING
VCM-X / RNE Operator Interfaces Technical Guide 60
VAV/Zone 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 - Auxiliary Heat Setpoint
XX Box Spts IDXXXX
Auxiliary Heat
Setpoint..: XXºF
This setpoint allows you to set a Space Temperature that will enable
the Auxiliary Heat Relay (Relay 4) on the VAV/Zone Controller Re-
heat Expansion Board for heating options other than box heat, such as
baseboard heat or an external duct heater. This could control a stage of
electric heat or an on/off hot water valve. The Auxiliary Heat Relay will
energize at .5˚F below this setpoint and will de-energize at .5˚F above
this setpoint. The Auxiliary Heat will continue to function regardless of
the HVAC Mode the unit is in and at any airfl ow condition.
Description Minimum Default Maximum
Auxiliary Heat Setpoint 50ºF 70ºF 90ºF
Setpoint Screen #5 - 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