Prolon VC2000 Series - Annexes for Control Calculations

Proportional Component
Key Concepts
• Heating Setpoint:temperaturebelowwhichaheatingdemandwillbecreated.Inthegraphicabove,heatingsetpoint=70ºF,
  andisusuallysetbythewallsensorsetpointadjustmentdialortouchpad.
• Cooling Setpoint:temperatureabovewhichacoolingdemandwillbecreated.Inthegraphicabove,coolingsetpoint=72ºF
  andisusuallysetbythewallsensorsetpointadjustmentdialortouchpad.
• Deadband: temperature band between the heating and cooling setpoints, at which the space has a 0% demand, and the
  zoneisconsideredtobesatised.Inthegraphicabove,deadband=2.0ºFandcanbeconguredinthe“MinDeadband”
box.
• Proportional Band: Temperature band divided into 2 halves, with one half placed below the Heating Setpoint, and the other
half placed above the Cooling Setpoint. Each half band represents the temperature deviation from setpoint needed to
create a 100% demand.
This annex explains in detail how a zone’s demand is calculated. A zone’s demand is calculated by adding the integral
component to the proportional component.
Deadband
Annex A (Proportional + Integral Control)
9-14