ZONEMASTER ZONETOUCH V2 ZONE CONTROL SYSTEM - Installation Manual 13
7.1.4 Spill/Bypass Mode
Bypass and spill modes are another safety feature of the ZONETOUCH V2
systemtopreventpressurefrombuildingupandcausingductdamage.This
usuallyoccursifsomeonehasturnedoalldamperswhiletheA/Cunitis
runningleadingtoapressurebuildup(andpotentialofductpuncture,blow-os
or joints splitting).
Whenopenedzonesinthesystemarelessthanthebypass/spillset-point
whichisapercentageofopenedzonesagainsttotalzones,thedesignatedspill
dampersorBypassdamperwillbeautomaticallyopenedtopreventpressure
from building up.
Spill Mode
Thisisaprogramdesignedtoautomaticallyopenseveraldampersifsomeone
attemptstoshutdownalldampersthuspreventingpressurebuildup.Spillmode
usesthezoneswithloweraddressesinthesystem.Whenallocatingaddresses
t o zonesinspillmode,itisstronglyrecommendedtogiveloweraddressesto
thosezonesthathavehigherspillprivileges.Thesezonesarenormallylocated
closertothereturnairgrilles.Thelowertheaddress,thehigherthespillprivilege
thezonehas.
AnotherpointtorememberisDONOTusebedroomsasspillzones.Duringsleep
timeiftheairconditionerisonandspillzonesareautomaticallyforcedtoopen,
t h e spillzoneswillbeverycoldorhot.Thismaycausediscomfortifbedrooms
areusedasspillzones.
Whenthespillset-pointisreached,themaincontrolmoduleinstructszone1to
openasspillzone.Iftherstspillzonecannotsatisfythespillaircontrol,zone2
willautomaticallyopentospillexcessair.Thisprocesswillcontinueuntilthespill
airset-pointissatisedinthesystem.Example:Inaneightzonesystem,ifset
pointissetat30%thenitwillhaveatleast3(calculatedvalue=2.4)ormore
zonesremainingopen.
Bypass Mode
InBypassModethereisanextradamperandalengthofductthatgoesdirectly
fromthesupplyairductbacktothereturnairduct.Themaincontrolmodule
instructsthebypassdampertoopenanddumpexcessairtothereturnairduct.
Thebypassdampershouldbecarefullysizedtobeabletohandleexcessairwhile
allzonesareclosed.Thebypassdampershouldbeconnectedtothe‘B’porton
the main control module.
Thefactorydefaultissetinspillmodeandtheset-pointis30%.Whenthesetpoint
isreachedforspill,thehomescreenshows‘SpillisActivated‘andsomeofthe
lowerorderzonesremainopenandthestatusoftheGroupswilldisplay‘Spill’in
thehomescreen(Figure12)ifthelowerordergroupswereclosed.