LX Series Unit Ventilator Controller User's Guide 31
Heating Modulate (HEATING_MOD)
Provides the modulated heating control output.
Heating or Cooling Valve Modulate (HEATING_VALVE_MOD)
(COOLING_VALVE_MOD)
These outputs provide modulated heating or cooling valve outputs.
Fresh Air Damper Modulate (FRESH_AIR_DAMPER_MOD)
This output provides a modulated fresh air damper signal.
Fresh Air Damper Open or Close
These outputs operate the floating fresh air damper.
Mode Selection
The UVC has several different modes of operation. Each mode has a unique set of
setpoints. Modes can be initiated as a result of any one item in the following list:
• change of value in nviOccCmd
• change of value in nviOccManCmd
• occupied button press
• bypass button press
• window open/close contact
While in any mode, the controller can enter a heating or cooling state as required to
maintain the space within the limits of the setpoints. Setpoints for each mode are
shown in Table 5.
Network Variables Used for Mode Selection
The network variable nviOccCmd commands the UVC to change modes according
to the value of the variable. The value of nviOccCmd is changed by a schedule or
other supervisory input.
Table 5: Values of nviOccCmd or nviOccManCmd and Modes
Identifier Unit Ventilator Controller
Mode
Setpoints
OC_OCCUPIED Occupied mode Occupied heat and cool
OC_UNOCCUPIED Unoccupied mode Unoccupied heat and cool
OC_BYPASS Bypass mode Occupied heat and cool
OC_STANDBY Standby mode Standby heat and cool
OC_NUL Invalid data Unoccupied heat and cool
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