Invacare IRC5P, IRC5PO2 4 Way Valve Function Test

SECTION 23—LEAK TEST
Perfecto2™78 Part No 1148070
4 Way Valve Function Test
NOTE:Forthisprocedure,refertoFIGURE 23.1onpage 77.
The4‐wayvalveusedinthePerfecto2SeriesConcentratorsdoeshaveanacceptable
toleranceofleakageperRexRoth®.
Bynatureofthevalvedesignitispossibleforthevalvetoexperiencesmallleaks,andstill
operatewithoutaffectingtheoverallperformanceoftheunit.Thevalveisassembled
wherethecomponentsthatmakeupthevalve“Snap”together.Theonlyscrewsinthe
valveareforsecuringthevalvetothemanifoldassembly.
AccordingtoRexRoththereisanacceptableleakspecificationof60ccperminuteat20
psioneachvalve.Val ves thathaveleakswithinthisspecificationwillfunctionproperly
withoutanyadverseeffectstotheperformanceoftheconcentrator.Aleakintheamount
of60ccorlesswouldbeindicativeofthetypeofsmallleakyouwouldnoticewherethe
endcapsconnecttothemainbodyorwherethethreepiecesofthemainbodyconnect
together.A60ccleakwouldnotbenoticeablewhenexaminingthesystempressure
swings.
Leaksgreaterthan60ccareindicativeofcracksintheendcaps,orablownsealwherethe
endcapconnectstothemainbodyofthevalve.Theseleaksaredetectedbyeitherreading
thesystemswingpressures,noticingtwoconsecutiveswingsnotbeingequalorby
hearinganaudibleleakeveryothercycle.Leaksofthisextremenatureindicatethevalve
needstobereplaced.
Valv esshouldonlyneedtobereplacedwhenthefollowingconditionsexist:
1. Avisiblecrackisnotedoneitheroftheendcapsormainbodyofthe4wayvalve,
regardlessoftheamountofleak.
2. Alargeleakispresentonthevalvethatcausesanimbalanceinthesievebedswing
pressures.Example:SieveBed1pressureswingsfrom14psito16psi,within7‐20
secondsandSieveBed2pressureswingsfrom13psito16psislowly,andmaytake
aslongas25‐30secondsbeforeshifting(timesover30secondwillshutdown
automatically).
3. Valvewillnotshiftandthepilotvalvesolenoidandcircuitboardareworking
properly.
NOTE:Theconcentrator’sP.C . B . shouldexhibitanerrorcodeforHighPressureFailure(1Red/
2Green).
NOTE:Thebestmethodtotestthe4‐wayvalveoperationisbymeasuringtheunitpressure
swings.ThiscaneasilybedoneattheHomeFillportwitha0‐30psipressuregaugeanda¼”fill
lineadapter.Uponstartingtheunitshouldbuildpressureupto16psiforoutputflows3L/min
andbelowor21psiforoutputflows4L/minandabovebeforeitsinitialshift.Aftertheinitialshift
theunitshouldshiftconsistentlyinequalamountsoftime+/‐1second(timerecordedinseconds).