User Guide

SECTION 22—TIMING

Part No 1148070 73 Perfecto

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SECTION 22—TIMING

 DANGER

Topreventelectricalshock,ALWAYSdisconnectconcentratorfromelectricaloutlet

beforeservicing.

Useextremecarewhenmakingadjustmentstothetimingswitch.DONOTallow

screwdriveroryourhandstocontacttheP.C. Boardwhenunitispluggedinand/oron.

Turnunitoffandunplugbeforeadjustingtimingswitch.Electricalshockispossible.

Toaccommodatethevaryingtoleranceswhenreplacingcomponents,anadjustabletimer

isusedtocontroltheshifttimeofthepressureequalization(P.E.)valve.TheSensO

board

allowsforautomatic(microprocessorcontrolled)adjustmentsoftheP. E . shifttimes.Non‐

SensO



boardsallowformanualadjustment.

Autotuning

 WARNING

DONOTpushtheautotunebuttonwhilepoweringup.Otherwise,thefactorysettings

willbeerased.

NOTE:Forthisprocedure,refertoFIGURE 22.1onpage 74.

1. Turnpoweroff()andunplugtheunit.

2. Removecabinet.RefertoRemovingCabinetonpage 23.

3. Plugtheunitinandturnthepoweron().

4. LocatetheP. C . board.

5. Waitforthemainvalveshifttoindicateoneofthefollowing:

•IftheP. C . boardisnew,thefrontpanelREDindicatorlightwillslowlyblink,

indicatingautotunehasinitiated.

•IftheP. C . boardisused

andhasperformedautotuningbefore,pressandrelease

thesmallpushbuttonontheP. C . board.ThefrontpanelREDindicatorlightwill

slowlyblink,indicatingtheunitisautotuningandautomaticallyadjustingtheP. E . 

valvetiming.

6. Settheoutputflowto5.0L/min.

7. TheGREEN(onboard)diagnosticlightwillflashthecurrentvalueoftheP.E.valve

timingnumber.

8. PlacethecoverbackontheunitbutDONOTinstallthecoverscrews.Lettheunitrun

untilautotuningiscompleted.

9. Whenautotuningiscomplete,theREDfrontpanelindicatorlightwillchangefroma

slowblinkingtoaflashingofthefinalP. E . valvetimingnumber.