Orion System System Manager TS II In-House - Manual (Page 39)

SMTS II Technical Guide
VCM & VCM-X Controllers
39
VCM & VCM-X Miscellaneous Setpoints
Trend Logging Interval
An Internal Trendlog is constantly updated at a rate equal to this value.
High limit = 120 minutes; Low limit = 1 minute; Default = 15 minutes.
Indoor Humidity Setpoint
On VAV or CAV confi gured units that are not using 100% Outdoor Air,
when the Indoor Relative Humidity percentage rises above the Indoor
Humidity Setpoint, the unit will start operating in Dehumidifi cation
Mode. If an Indoor Humidity Sensor is installed, the unit will reset the
Coil Suction Temperature Setpoint as needed to maintain this Indoor RH
Setpoint. This includes VAV, CAV and MUA applications. High limit =
100%; Low limit = 1%; Default = 50%.
Return Bypass Damper Factor
This setpoint is used when your HVAC unit is confi gured for Return
Air Bypass Damper control. The Return Air Bypass Damper Factor
Setpoint is a percentage value that is used to calculate the Return Air
Damper position in relation to the Return Air Bypass Damper position.
This provides a method for adjusting the airfl ow through the Return Air
Bypass Damper.
Increasing this percentage increases the airfl ow through the Return Air
Bypass Damper by causing the Return Air Damper to move further
towards its closed position in relation to the Return Air Bypass Damper
moving towards its open position.
Decreasing this percentage decreases the airfl ow through the Return
Air Bypass Damper by causing the Return Air Damper to move further
towards its open position in relation to the Return Air Bypass Damper
moving towards its closed position. High limit = 100%; Low limit =
0%; Default = 40%.
Head Pressure Setpoint (VCM-X Modular, VCM-X WSHP)
Enter the maximum head pressure setpoint for the Head Pressure Module.
High limit = 420 PSI; Low limit = 240 PSI; Default = 315 PSI.
Reheat Head Pressure (VCM-X Modular, VCM-X WSHP)
Enter the maximum head pressure setpoint for the Reheat Mode of op-
eration. High limit = 400 PSI; Low limit = 250 PSI; Default = 400 PSI.
Figure 65: VCM-X Miscellaneous Setpoints Screen 3
Setpoints for Unit 0102
Max Fan Voltage All Modes 10.0 VDC
Miscellaneous Page 3 of 4
Figure 66: VCM-X Miscellaneous Setpoints Screen 4
Max Fan Voltage All Modes
This is the maximum fan voltage allowed in all modes of operation.
High limit = 10.0 vdc; Low limit = 0.0 vdc; Default = 10.0 vdc.