Orion System OE392-10 System Manager TS - Manual (Page 43)

SMTS Technical Guide
VCM, VCM-X & VCB-X Controllers
43
VCB-X Controllers
VCB-X Static Setpoints
Static Setpoints
Touch the
< Static>
button to access the Static Setpoint
Screens.
Heating Maximum Fan VFD Speed
If this unit is confi gured for Single Zone VAV operation, and you have a
Modulating Heat source that will allow VAV heating, then the Heat Mode
Minimum Fan VFD Signal will be the fan speed at which the VFD will
start operating at when heating is initiated. It can then modulate up to the
Heating Maximum Fan VFD Signal Setpoint as the Space Temperature
falls within the range created by the High Space Setpoint and the Low
Space Setpoint. If this is a CAV unit or a Single Zone VAV unit that will
have CAV Heating, these minimum and maximum setpoints should both
be set at the same value which represents the constant speed you want
the fan to operate at during the Heating Mode. High limit = 100%; Low
limit = 30%; Default = 100%.
Vent Mode Minimum Fan VFD Signal
The Vent Mode Minimum Fan VFD Signal is the speed at which the fan
will operate at during the Vent Mode in a unit confi gured for Single Zone
VAV operation. High limit = 100%; Low limit = 0%; Default = 20%.
Economizer Minimum Position
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. High
limit = 100%; Low limit = 0%; Default = 10%.
Economizer Max Pos in High CO2
This Setpoint allows you to set the Maximum Position the Economizer
will open if high CO
2
conditions occur in the space. The Maximum
Economizer Position Setpoint is used to limit the amount of Outdoor
Air that will be introduced to the HVAC unit in order to ensure the unit
is operating within its Heating and Cooling design limitations. The
Minimum setting for this Setpoint is the value previously set for the
Economizer Min Position Setpoint. High limit = 100%; Low limit =
0%; Default = 50%.
Economizer Max Pos in Heating Mode
This Setpoint allows you to set the Maximum Position the Outdoor Air
Damper will open to while Heating is operating. This takes priority over
the Economizer Maximum Position in High CO
2
Setpoint. High limit =
100%; Low limit = 0%; Default = 50%.
Minimum Outdoor CFM
If controlling the Outdoor Air Damper to an airfl ow setpoint, this screen
allows you to set the design Minimum Outdoor Air CFM Setpoint. High
limit = 200.00 kCFM; Low Limit = 0.10 kCFM; Default = 2.00 kCFM.
Outdoor CFM Deadband
The Outdoor CFM Setpoint uses this proportional value to calculate
the maximum reset of the minimum CFM requirements. High limit =
9999.00 CFM; Low Limit = 200 CFM; Default = 10 CFM.
IAQ Altitude {For CO2 Sensor}
Enter the distance above sea level for the installed Carbon Dioxide Sen-
sor. Altitude correction is required for valid readings if you are above
500 feet. High limit = 15,000 feet; Low limit = 0 feet; Default = 1000.
IAQ Minimum CO2 Setpoint
The CO
2
Minimum Setpoint is the threshold CO
2
level at which the
Economizer Minimum Position will begin to be reset higher. In between
the set minimum and maximum CO
2
levels, the Economizer Minimum
Position will be proportionally reset between the set Economizer
Minimum and Maximum position. High limit = 2000 PPM; Low limit
0 PPM; Default = 900 PPM.
IAQ Maximum CO2 Setpoint
The CO
2
Maximum Setpoint is the CO
2
level at which the Economizer
Minimum Position will be reset to the Economizer Maximum Position.
In between set minimum and maximum CO
2
levels, the Economizer
Minimum Position will be proportionally reset between the set Econo-
mizer Minimum and Maximum position. High limit = 2000 PPM; Low
limit 0 PPM; Default = 1000 PPM.
Static Pressure Setpoint
For VAV units, a Supply Fan VFD or Bypass Damper Actuator is used to
maintain the Duct Static Pressure Setpoint. The Static Pressure Output
Signal varies to control to the Static Pressure Setpoint. The Duct Static
Pressure is maintained at this setpoint anytime the Main Fan is running.
High limit = 3.00”WG; Low limit = 0.10”WG; Default = 0.50”WG.
Static Setpoint Deadband
The Duct Static Setpoint accuracy is controlled by this value. No
Main Fan VFD changes are made if the static is within this range of
this setpoint. High limit = 1.00”WG; Low limit = 0.01”WG; Default
= 0.10”WG.
Building Pressure Setpoint
The Building Pressure is maintained at this setpoint while the Main Fan
is running. See detailed explanation that follows. High limit = 0.20”WG;
Low limit = -0.20”WG; Default = 0.10”WG.
Building Setpoint Deadband
The Building Pressure Setpoint accuracy is controlled by this value. No
Relief Fan VFD changes are made if the pressure is within this range
of this setpoint. See detailed explanation that follows. High limit =
0.10”WG; Low limit = 0.01”WG; Default = 0.02”WG.
Static