Orion System VCM-X/RNE Controller - Manual (Page 49)

VCM-X / RNE Operator Interface SD
VCM-X / RNE SETPOINTS
49
based on the highest head pressure reading of up to 4 Head Pressure
Sensors. This screen only applies if using the VCM-X E-BUS Control-
ler, or RNE Controller.
See the One Condenser Head Pressure Module Technical Guide, the
Two Condenser Head Pressure Module Technical Guide, or the RNE
Controller Technical Guide for detailed information.
Description Minimum Default Maximum
Reheat Head Pressure
Setpoint
200 PSI 400 PSI 400 PSI
Setpoint Screen #17 - Economizer OAT/WB
Enable
VCM-X / RNE Spts
Economizer Setpoints
OAT/WB Enable: 55ºF
If an Outdoor Air Humidity Sensor is not connected to the Unit Con-
troller and the Outdoor Air Temperature falls below this Setpoint, the
Economizer can be used for Free Cooling. If an Outdoor Air Humidity
Sensor is connected to the controller, then a Wetbulb Temperature will
be calculated and used instead of the Outdoor Air Drybulb Temperature
to determine when Free Cooling can be used.
Description Minimum Default Maximum
Economizer Setpoints
OAT/WB Enable
0ºF 55ºF 80ºF
Setpoint Screen #18 - Economizer Minimum
Position & Control Rate
VCM-X / RNE Spts
Economizer Setpoints
Min Position.: 10 %
Control Rate.: 90
The Economizer (OA Damper) Min Position Setpoint is maintained
during the Occupied Mode even if the Economizer is disabled due to the
OA Temperature or Wetbulb Temperature being above the Economizer
Enable Setpoint. The Control Rate Setpoint allows you to adjust the
Economizer to modulate the OA Damper Actuator faster or slower as
desired. The Control Rate Setpoint range is 10-99. Larger numbers make
the Economizer Outdoor Air Damper Actuator modulate faster, smaller
numbers make the Outdoor Air Damper Actuator modulate slower.
Description Minimum Default Maximum
Economizer Min Position 0% 10% 100%
Economizer Control Rate 10 90 99
VCM-X / RNE Setpoint Screens
Setpoint Screen #14 - Dehumidifi cation Coil
Temperature
VCM-X / RNE Spts
Dehumidification
Coil Temperature
Setpoint.....: 45ºF
During the Dehumidifi cation Mode, the Unit Controller uses the cal-
culated Coil Temperature to activate DX Cooling based on this Dehu-
midifi cation Coil Temperature Setpoint. The controller uses a Suction
Pressure Transducer to read Suction Pressure (the Saturation Vapor
Pressure of the Refrigerant) and converts this Suction Pressure reading
to a Coil Temperature value. This calculation is based on using R22 or
R410A refrigerant only and will not work with any other refrigerant.
This setpoint determines the number of compressor stages that need to
be activated to maintain the Dehumidifi cation Coil Temperature Setpoint.
Description Minimum Default Maximum
Dehumidifi cation Coil
Temperature Setpoint 35ºF 45ºF 70ºF
Setpoint Screen #15 - Cooling Head Pressure
Setpoint
VCM-X / RNE Spts
Cooling
Head Pressure
Setpoint: 315PSI
If you are using the Head Pressure Module, this is the Cooling Setpoint
for control of the condenser fan speed. This is based on the highest
head pressure reading of up to 4 Head Pressure Sensors. This screen
only applies if using the VCM-X E-BUS Controller, or RNE Controller.
See the One Condenser Head Pressure Module Technical Guide, the
Two Condenser Head Pressure Module Technical Guide, or the RNE
Controller Technical Guide for detailed information.
Description Minimum Default Maximum
Cooling Head Pressure
Setpoint
200 PSI 315 PSI 400 PSI
Setpoint Screen #16 - Reheat Head Pressure
Setpoint
VCM-X / RNE Spts
Reheat
Head Pressure
Setpoint: 400PSI
If you are using the Head Pressure Module, this is the Reheat Setpoint
for control of the condenser fan speed during dehumidifi cation. This is