Orion System OE392-10 System Manager TS - Manual (Page 30)

VCM & VCM-X Controllers
SMTS Technical Guide 30
VCM & VCM-X Temperature & Static Setpoints
Cooling High Reset Source
As the Reset Source Temperature rises to this level, the Supply Air
Setpoint drops to its minimum setting (Cooling SAT/Low Reset Limit
Setpoint). If doing VFD Reset in a Single Zone VAV application, this
Space Temperature will cause the VFD to modulate toward its 30%
minimum. High limit = 200; Low limit = 0; Default = 75.
Cooling Low Reset Source
As the Reset Source Temperature drops to this level, the Supply Air
Setpoint rises to its maximum setting (Cooling SAT/High Reset Limit
Setpoint). If doing VFD Reset in a Single Zone VAV application, this
Space Temperature will cause the VFD to modulate toward 100%. High
limit = 200; Low limit = 0; Default = 75.
Heating High Reset Source
As the Reset Source Temperature rises to this level, the Supply Air
Setpoint drops to its minimum setting (Heating SAT/Low Reset Limit
Setpoint). If doing VFD Reset, the Space Temperature will cause the
VFD to modulate toward its 50% minimum. High limit = 200; Low
limit = 0.; Default = 70.
Heating Low Reset Source
As the Reset Source Temperature drops to this level, the Supply Air
Setpoint rises to its maximum setting (Heating SAT/High Reset Limit
Setpoint). If doing VFD Reset, the Space Temperature will cause the VFD
to modulate toward 100%. High limit = 200; Low limit = 0; Default = 70.
Heat Pump Defrost Temperature
If the Coil Temperature is below this value, the Defrost Mode is activated
if the Heat Pump Defrost Interval is satisfi ed. High limit = 50ºF; Low
limit = 0ºF; Default = 30ºF. (This setpoint is only available if your unit
has this feature.)
Heat Pump Defrost Interval
The Heat Pump Defrost Mode can only occur this often when the Coil
Temperature is below the Defrost Temperature Setpoint. High limit = 90
minutes; Low limit = 10 minutes; Default = 30 minutes. (This setpoint
is only available if your unit has this feature.)
Defrost Adaptive Timer (VCM-X Modular)
Enter a value greater than zero to enable the Adaptive Defrost Cycle
Mode. High limit = 30 minutes; Low limit = 0 minutes; Default = 30
Static Setpoints
Touch the
< Static>
button to access the Static Setpoint
Screens.
Duct Static 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 the Static Pressure Setpoint. The Duct Static
Pressure is maintained at this setpoint while the Main Fan is running.
High limit = 3.00”WG; Low limit = 0.10”WG; Default = 0.50”WG.
Static
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 set-
point. High limit = 1.00”WG; Low limit = 0.01”WG; Default = 0.10”WG.
Static Control Interval
The Duct Static Control output is adjusted at a rate equal to this value. If
the Duct Static Pressure is above the Static Setpoint plus the Deadband,
the Static Pressure Output Signal will be reduced at every Control Rate
interval. If the Static Pressure is below the Static Setpoint minus the Dead-
band, the Output signal will be increased at every Control Rate interval.
High limit = 30 seconds; Low limit = 1 second; Default = 10 seconds.
Building Pressure Setpoint
The Building Pressure is maintained at this setpoint while the Main
Fan is running. See detailed explanation in next column. 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 in next column. High limit =
0.10”WG; Low limit = 0.01”WG; Default = 0.02”WG.
Building Pressure Setpoint and Deadband
Direct Acting Control:
If an Exhaust Fan Relay is confi gured, when the Building Static Pressure
rises above the Building Pressure Setpoint plus the Deadband, the Exhaust
Fan Relay will activate. It will remain on until the Building Pressure falls
below the Building Pressure Setpoint minus the Deadband. If Modulating
Building Pressure is confi gured, when the Building Static Pressure rises
above the Building Pressure Setpoint plus the Deadband, the Building
Pressure Output Signal will increase until the Building Static Pressure
falls within the Deadband. If the Building Static Pressure falls below the
Building Pressure Setpoint minus the Deadband, the Building Pressure
Output Signal will decrease until the Building Static Pressure rises within
the Deadband. The Building Pressure Output Signal is confi gurable for
0-10 or 2-10 VDC. For more detailed operation information, see the
VCM-X Controller Technical Guide for the complete Building Pressure
Control Sequence of Operation.
Reverse Acting Control:
The Building Pressure Output Signal remains a Direct Acting 0-10 or
2-10 VDC signal, but the logic is reversed. On a drop in Building Static
Pressure below the Building Pressure Setpoint minus the Deadband,
the Building Pressure Output Signal will increase to modulate open the
Outdoor Air Damper. When this option is used, no economizer or IAQ
operation will be available.
Economizer Minimum Position
The Economizer (Outdoor Air Damper) Min Position Setpoint is main-
tained during the Occupied Mode even if the Economizer is disabled
due to the Outdoor Air Temperature or Wetbulb Temperature being
above the Economizer Enable Setpoint. Anytime the Economizer is
not modulating for a cooling demand, it will remain at this Minimum
Ventilation Position during Occupied hours. High limit = 100%; Low
limit = 1%; Default = 10%.