Wolf CGB-2-24 - Page 17

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8. Standardsandregulations
Toprotectagainstscaling,theDHWtemperatureshouldbe
settomax.50°Cwhenthetotalwaterhardnessis15°dH
(2.5mol/m³)orabove.
UndertheDrinking Water Ordinance[Germany], thisis
thelowestpermissiblevalueforDHWtemperatures,asit
practicallyrulesouttheriskoflegionellaproliferationwith
dailyuseofthehotwatersystem(whenaDHWcylinder
≤400lisinstalled–waterinthecylinderisfullyreplaced
within3daysthroughusage.)
Withatotalhardness of20 °dHorhigher,theuse ofa
watertreatmentfacilityinthecoldwatersupplylinewhen
heatingDHWisessential,inordertoextendmaintenance
intervals.
Evenifwaterhardnessisbelow20°dH,ahigherriskof
scalebuild-upmayoccurlocally,necessitatingsuitable
softeningmeasures.Failuretotakesuchmeasureswill
resultinprematurescalingoftheapplianceandareduc-
tionintheconvenientavailabilityofdomestichotwater.
Thecontractorresponsibleshouldalwayscheckthelocal
conditions.
Theadjustablecylinderwatertemperaturecan
exceed 60 °C. Short-term operation at tempera-
turesabove60°Cmustbesupervisedinorder
topreventscalding.Forpermanentoperation,
appropriate precautions should be taken to
preventdraw-offtemperaturesabove60°C,e.g.
thermostaticvalve.
Fig: Wolf wall-mounted gas condensing boiler
CGB-2...wallmountedgascondensingboiler
Gas condensing boiler to EN 437/EN 13203-1/EN 15502-1/
EN 15502-2-1/EN 60335-1/EN 60335-2-102/EN 62233/EN
61000-3-2/EN 61000-3-3/EN 55014-1, as well as 92/42/
EEC (Efciency Directive) / 2016/426/EU (GasAppliances
Directive), 2014/30/EU (EMC Directive) / 2014/35//EU (Low
Voltage Directive) / 2009/125/EC (ErP Directive) / 2011/65/
EU (RoHS Directive) / Commission Delegated Regulation
(EU) No 811/2013 / Commission Delegated Regulation (EU)
No813/2013,withelectronicignitionandelectronicuegas
temperature monitoring, for low temperature heating and DHW
heatinginheatingsystemswithowtemperaturesupto90°C
and 3 bar permissible operating pressure in accordance with
EN 12828.This Wolf gas condensing boiler is also approved
for installation in garages.
Gascondensingboilersoperatedwithanopen
uemaybeinstalledonlyinroomsthatcomply
withtheappropriateventilationrequirements.
Otherwisethereisariskofasphyxiationorpoi-
soning.Readtheinstallationandmaintenance
instructions before installing the boiler.Also
takeintoconsiderationalltechnicalinformation.
WhenoperatingtheboilerwithLPGuseonly
propaneaccording to DIN 51 622, otherwise
faults may arise when starting andoperating
thegascondensingboiler,whichmayleadto
damagetotheapplianceandpersonalinjury.
 ApoorlyventedLPGtankcanleadtoproblems
withignition.Insuchacase,contactthecom-
panythatllstheLPGtank.