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51

r.3.1Bagfilters

Releasethebagfiltercellsbyactivatingthehandlesandpulloutthefiltercellsoftheunitcasing.Theframe

profilesaretobecleanedandallsealscheckedfordamage. Thehandlesandlockingguiderailsarealsoto

be

checkedtoensurethattheycanoperate

unob

structed.Thenewfilterbagsmustbepushedcarefully

intotheunitinorderto ensurethattheyaresealedproperly.Thevariousfiltersizesshouldbeplacedinan

ordercorrespondingtothewayinwhichtheunitisdesigned,andthefiltersmusthave verticalbags.

r.3.2Panelfilters

Thef iltercellguiderailsareto becleanedbeforefittingthenewfilters.

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r.4.ChangingtheInternalBatteryinthecontroller

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Note:

ThisprocedurerequiresknowledgeofproperESDprotection;i.e. anearthedwristbandmustbeused

!

Whenthealarm”InternalBattery”isactivatedandthebatteryLEDlightsupred,thebatteryforbackupof

programmemoryandreal‐timeclockhasbecometooweak.Thebatteryisreplacedasdescribed

below.A

backupcapacitorsavesthememoryandkeepstheclockrunningforatleast10minutesafterthepower

supplyisremoved.Therefore,ifthebatteryreplacementtakeslessthan10minutes,ther ewillbenoneed

toreloadtheprogram,andtheclockwillcontinuetorunnormally. 



ThereplacementbatterymustbeofthetypeCR2032.



Removethecoverbypressingdownthelocking

torquesattheedgeofthecoverusingasmall

screwdriver,andatthesametimepulling theedges

outwards.



Gripthebatteryfirmlywithyourfingersandliftit

upwardsuntilitrisesfromitsholder.Pressthenew

batteryfirmlydownintoplace.Notethatto

preservecorrectpolarity;thebatterycanonlybe

insertedthe“rightwayround”.



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