Crown Bermuda Installation Manual

CAUTION

If,duringnormaloperation,itisnecessarytoaddwatertothisboilermorefrequentlythanonceamonth,consultaqualied

servicetechniciantocheckyoursystemforleaks.Aleakysystemwillincreasethevolumeofmake-upwatersuppliedto

theboilerwhichcansignicantlyshortenthelifeoftheboiler.Entrainedinmake-upwateraredissolvedmineralsandoxy-

gen.Whenthefresh,coolmake-upwaterisheatedintheboilerthemineralsfalloutassedimentandtheoxygenescapesas

agas.Bothcanresultinreducedboilerlife.Theaccumulationofsedimentcaneventuallyisolatethewaterfromcontact-

ingthecastiron.Whenthishappensthecastironinthatareagetsextremelyhotandmayeventuallycrack.Thepresence

offreeoxygenintheboilercreatesacorrosiveatmospherewhich,iftheconcentrationbecomeshighenough,cancorrode

thecastironthroughfromtheinside.Sinceneitherofthesefailurestypesarearesultofacastingdefectthewarrantydoes

notapply.

• ForMcDonnell&Miller#67lowwatercut-offs-Removeandinspectswitchandoatmechanism.Inspectoat

bowlformudaccumulation.Cleanasrequired.Replacetheswitchandoatmechanismeveryveyearsor100,000

cycles.ConsulttheMcDonnellandMiller#67manualforanyadditionalmaintenanceinformation.Testthelow

watercut-offbeforeplacingtheboilerbackintoservice.

13)Allowtheboilertocooltoroomtemperature.Removethedrainvalveand2x3/4bushingontheleftsideoftheboiler.

Useaashlighttoinspectthebottomrowofpushnipplesforaccumulatedscaleormud.Ifasignicantamountispresent,use

thefollowingproceduretocleantheinsideoftheheatexchanger:

a)Temporarilyinstalla11/4inchorlargerfullportballvalveinplaceoftheboilerdrain.Temporarilypipetheoutlet

ofthisvalvetoalocationwherehotwaterandsteamcanbesafelydischarged.

b)Makesurethatthisvalveisclosedandthatthewaterlevelisatthenormalwaterline.

c)Ifakingvalveispresentinthesteammaintakeoff,closeit.Alternatively,temporarilyreplaceenoughofthe

ventsonthemainsand/orradiatorswithplugssothat2-5psicanbedevelopedwhentheboilerisred.

d)Firetheboilerandallowittosteamuntil2-5psiisregisteredonthegauge.

e)Turnofftheburnersandimmediatelyfullyopenthe1-1/4valve.

f)Allowtheboilertoblowdownuntileitherthewaterrunsclearorthewaterlevelreachesthebottomofthegauge

glass.

g)Allowallpartsoftheboilertocooltoroomtemperature.Draintheboilercompletelyandremovethe1-1/4valve.

h)Ifsignicantmudorscaleisstillpresentinthebottomoftheboiler,repeatsteps(b)through(g)untilallmudor

scaleisremoved.

i)Onceallmudorscaleisremoved,replacethe1-1/4valveandtemporaryblow-downpipingwiththestandarddrain

valve.Afterallpartsoftheboilerareatroomtemperature,relltheboilertothenormalwaterline.

14) Placetheboilerbackinoperationusingtheprocedureoutlinedin“Start-up”.Checkthepilotlineandanyothergaspip-

ingdisturbedduringtheinspectionprocessforleaks.

Heat Exchanger Cleaning Procedure

1) Turnoffelectricalpowerandgassupplytotheboiler

2) Disconnectthedamperandventconnectorfromtheboiler.

3)Removetheupperfrontandtopjacketpanels.Ifpossible,removetherearandleftsidejacketpanels

4) Removetheburners.

5) Removetheblockedvent(“spill”)switch

6) Removethe¼-20nutsandwashersholdingtheuecollectorontotheheatexchanger.

7) Carefullyremovetheuecollectorgasketstripsandsetthemaside.

8) Removetheuecollectorfromtheheatexchanger.

9) Cleantheuepassagewaysusingastiffbristlebrush.Becertainthatallforeignmaterialisremovedfromthegaps 

 betweenthepins

10) Cleanthebottomsurfacesoftheheatexchanger

11) Putalightinthecombustionchamberandlookthroughtheuepassagesfromthetoptoverifythattheyhavebeen 

 thoroughlycleaned.