Prolon VC2000 Series - Page 87

1.6.1 - Unit with Heating Stages (On-O)
• Choose which available outputs will be used for the heating stages (Digital Output 4, Digital Output 5 and/or Analog Output
  1).Eachoutputhasadropdownmenu.Ifaspecicoutputis notbeingused,setit to“OFF”intheoutput’srespective
dropdown list.
OFF ON
Setpoint
Dierential
Demand
OFF ON
Setpoint
45% 65%
55%
20%
Dierential
Demand
•  IfusingAnalogOutput1tocontrolanon-oheatingstage,besuretoselect“Dierential”.(“Proportional”isusedfora
modulating output, details in Section 3.5.2)
•  Thesetpointanddierentialvaluesdeterminewhentheheatingstageturnson,andwhenitturnso.Thedierentialis
centered on the setpoint.
•  LookingatStage1,withasetpointof55%andadierentialof20%.
• Stage 1 will be activated once the demand (source: Math 2) reaches the following point:
Stage 1 On = Setpoint + 1/2 (Dierential)
Stage 1 On = 55% + 1/2 (20%) = 65%
• When Stage 1 is activated, the unit will supply warm/hot air to the zones.
• All VAV zones with a heating demand will open their dampers. All zones with a cooling demand will close their dampers to
their minimal positions.
•  As thezonesreceivewarm/hotair, theirindividual heating demandswill decrease, thus directly aecting Math2.As a
result, Math 2 will decrease.
• Stage 1 will be deactivated once the demand (source: Math 2) reaches the following point:
Stage 1 O = Setpoint - 1/2 (Dierential)
Stage 1 O = 55% - 1/2 (20%) = 45%
•  Congureadditionalheatingstagesasneededusingthesameguidelines.
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