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54

Ifthereisdustontheedgesoftheplates,removeitwithasoftbr ush.Ifgreaseorothersuchsubstances

arepresent,thentheedgesmustbewashedusinggreasedissolvingdetergents

r.5.4.1By‐passdamper

Thedamperbladesarefittedwithsyntheticbearings requiringnolubrication. Eachda mperbladeis

connected byapivotingsystem.Thesteelrodsandbrassbushesdo notrequirelubrication.Air‐tightnessof

thedampers,whenthedampermotor  isintheclosedposition,mustbe

visually

checked onceayear.The

dampermotor istobeadjustedifthedamperdoesnotclosetightly.

r.5.4.2Condensatewaterdrain

Onceayearcleanthedrip  traybeneaththeheatexchanger,aswellasthedrainandthewatertrap.

Takecarethatthatthereissufficientwaterinthewatertrap.Ifadropleteliminatorhasbeenfitted,this

mustbecheckedonceayearandcleanedifnecessary.

r.5.5Run‐aroundheatexchangerDVR



Aheatrecoverysystemofthistypeconsistsofaheatingcoilinthesupplyair‐flowandacoolingcoilinthe

exhaustair‐flow.Afteranextendedrunningperiod(normallyafewyears)dustparticlescanaccumulateon

thesurfaceofthecoils.Thiscan

reducetheefficiencyofthecoils.Cleaningmustbecarriedoutwiththe

utmostcaretoensurethatthecoilfins arenotdamaged.

Thepipingsystemmustbeventedonceayearasairinthesystemcansignificantlyreducethecapacityof

thecoils.

r.5.5.1Pumpandpressureexpansion

Theserviceinstructionsissuedbythepump manufacturermustbefollowed.Thepressureexpansionsystem

mustbecheckedonceayear.Ifnecessary,thepressuremustbeincreasedto the

cor

rectlevel.

r.5.5.2Condensatewaterdrain

Onceayearcleanthedrip  traybeneaththeheatexchanger,aswellasthedrainandthewatertrap.

Takecarethatthatthereissufficientwaterinthewatertrap.Ifadropleteliminatorhasbeenfitted

to

the

coolingcoil,thismustbecheckedonceayearandcleanedifnecessary.

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