Orion System VCC-X Controller - Manual (Page 47)

VCC-X Operator Interface SD
VCC-X SETPOINTS
47
Setpoint Screen #22 - Head Pressure
Setpoints - Cooling and Reheat
VCC-X Spts ID:#
Head Pressure Spts
Cooling: 340psi
Reheat: 390psi
If a Head Pressure Transducer is connected to the RSMV Module
you can control a Condenser Fan or a Condenser Water Valve to
maintain these Head Pressure Setpoints in the Cooling and Dehu-
midifi cation Reheat Modes.
Description Minimum Default Maximum
Cooling Head Pressure
Setpoint 240 PSI 340 PSI 420 PSI
Reheat Head Pressure
Setpoint 240 PSI 390 PSI 420 PSI
Setpoint Screen #23 - Economizer Enable
Setpoint
VCC-X Spts ID:#
Economizer Enable
Setpoint: 72.0ºF
If this unit has been confi gured for Economizer control and an Out-
door Humidity Sensor is not connected to the VCC-X Controller, if
the Outdoor Temperature falls below this setpoint, the Economizer
can be used for free cooling. If a combination Outdoor Air Tem-
perature/Humidity Sensor is connected to the VCC-X Controller and
the Wetbulb or Dewpoint Temperature falls below this setpoint, the
Economizer can be used for free cooling.
Description Minimum Default Maximum
Economizer Enable -30ºF
(-34.4 º C)
55ºF
(12.8 º C)
80ºF
(26.6 º C)
Setpoint Screen #24 - Economizer Minimum
Damper Position
VCC-X Spts ID:#
Economizer Min
Damper Pos: 10%
The Economizer (OA Damper) Minimum Position Setpoint is
maintained during the Occupied Mode even if the Economizer is
disabled due to the OA Temperature being above the Economizer
Enable Setpoint.
Description Minimum Default Maximum
Economizer Min Position 0% 10% 100%
Setpoint Screen #25 - Maximum Economizer
Position in Heat Mode
VCC-X Spts ID:#
Max Econo Pos In
Heat Mode: 50%
This Setpoint allows you to set the Maximum Position the Outdoor
Air Damper will open to while Heating is operating. This takes prior-
ity over the Economizer Maximum Position in High CO
2
Setpoint.
Description Minimum Default Maximum
Maximum Economizer
Position in Heat Mode 0% 50% 100%
Setpoint Screen #26 - Minimum Outdoor
Airfl ow Setpoint & Deadband
VCC-X Spts ID:#
Min. Outdoor Airflow
Setpoint.: 2.00kCFM
Deadband.: 200CFM
If controlling the Outdoor Air Damper to an airfl ow setpoint, this
screen allows you to set the design Minimum Outdoor Air CFM
Setpoint. The Deadband controls the rate of change for the damper
signal. As OA CFM moves further from setpoint within this window,
the damper makes a larger change.
Description Minimum Default Maximum
Minimum Outdoor
Airfl ow Setpoint 0.10 kCFM 2.00 kCFM 200 kCFM
Deadband 10 CFM 200 CFM 9999 CFM
VCC-X Setpoint Screens