Polyaire Zonemaster ZoneTouch V2 - 7.1.4 Spill;Bypass Mode Configuration

ZONEMASTER ZONETOUCH V2 ZONE CONTROL SYSTEM - Installation Manual
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7.1.4 Spill/Bypass Mode
Bypass and spill modes are another safety feature of the ZONETOUCH V2
  systemtopreventpressurefrombuildingupandcausingductdamage.This
  usuallyoccursifsomeonehasturnedoalldamperswhiletheA/Cunitis
  runningleadingtoapressurebuildup(andpotentialofductpuncture,blow-os
or joints splitting).
Whenopenedzonesinthesystemarelessthanthebypass/spillset-point
  whichisapercentageofopenedzonesagainsttotalzones,thedesignatedspill
  dampersorBypassdamperwillbeautomaticallyopenedtopreventpressure
from building up.
Spill Mode
  Thisisaprogramdesignedtoautomaticallyopenseveraldampersifsomeone
  attemptstoshutdownalldampersthuspreventingpressurebuildup.Spillmode
  usesthezoneswithloweraddressesinthesystem.Whenallocatingaddresses
  t o zonesinspillmode,itisstronglyrecommendedtogiveloweraddressesto
  thosezonesthathavehigherspillprivileges.Thesezonesarenormallylocated
  closertothereturnairgrilles.Thelowertheaddress,thehigherthespillprivilege
  thezonehas.
AnotherpointtorememberisDONOTusebedroomsasspillzones.Duringsleep
  timeiftheairconditionerisonandspillzonesareautomaticallyforcedtoopen,

  t h e spillzoneswillbeverycoldorhot.Thismaycausediscomfortifbedrooms
  areusedasspillzones.
Whenthespillset-pointisreached,themaincontrolmoduleinstructszone1to
  openasspillzone.Iftherstspillzonecannotsatisfythespillaircontrol,zone2
  willautomaticallyopentospillexcessair.Thisprocesswillcontinueuntilthespill
  airset-pointissatisedinthesystem.Example:Inaneightzonesystem,ifset
  pointissetat30%thenitwillhaveatleast3(calculatedvalue=2.4)ormore
  zonesremainingopen.
Bypass Mode
  InBypassModethereisanextradamperandalengthofductthatgoesdirectly
  fromthesupplyairductbacktothereturnairduct.Themaincontrolmodule
  instructsthebypassdampertoopenanddumpexcessairtothereturnairduct.
Thebypassdampershouldbecarefullysizedtobeabletohandleexcessairwhile
  allzonesareclosed.Thebypassdampershouldbeconnectedtothe‘B’porton
the main control module.
Thefactorydefaultissetinspillmodeandtheset-pointis30%.
Whenthesetpoint
  isreachedforspill,thehomescreenshows‘SpillisActivated‘andsomeofthe
  lowerorderzonesremainopenandthestatusoftheGroupswilldisplay‘Spill’in
  thehomescreen(Figure12)ifthelowerordergroupswereclosed.