Part number 550-142-850/0115
35
FreeStyle
™
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
16
Install water piping
Domestic Water Piping – Combi Boiler
s 4HERMOSTATIC-IXING6ALVE!MIXINGVALVEFORREGULATINGDOMES
-
tic heating water ) must be used to regulate the water temperature
leaving the plate heat exchanger. NOTE: the valve must be set
TOSUPPLYADOMESTICWATERTEMPERATUREOFNOTMORETHAN
DEGREES&)TISTHERESPONSIBILITYOFTHEINSTALLERTOSETTHEVALVE
and remove the dial.
s $(7&ILTER)NSTALLATIONOFAMICRONORLOWERWATERlLTERAT
THEENTRANCEOFTHE$(7CONNECTIONTOPROTECTTHE$(7mOW
SWITCH&AILURETOINSTALLTHE$(7WATERlLTERFROMDIRTANDDEBRIS
WILLCAUSEITTOMALFUNCTION
s #HECK6ALVE!CHECKVALVEMUSTBElELDPROVIDEDANDINSTALLED
ONTHEOUTLETOFTHEMIXINGVALVETOPREVENTEXPANSIONDEVICES
DOWNSTREAMFROMBACKmOWINGWHENTHEWATERPRESSUREDROPS
during cold water draws. Failure to prevent the backflow will
cause water to flow through the flow switch, activating it, when
the cold water draw has ended and the water pressure increases.
s $RAINAND)SOLATION6ALVES)NSTALLDRAINANDISOLATIONVALVESON
THEINLETANDOUTLETOFTHE$(7CONNECTIONSSOTHATTHE$(7
HEATEXCHANGERCANBEmUSHEDANDCLEANEDFROMPOSSIBLEBUILDUP
caused by dirty or hard water, which is a maintenance require-
ment.
s (ARD7ATER4OPREVENTTHEFORMATIONOFSCALEONTHEINSIDEOF
the plate DHW heat exchanger and other components in the do-
mestic hot water system, water with hardness higher than 50 ppm
#ALCIUM#ARBONATEMUSTBETREATEDWITHAh7ATER3OFTENERvPRIOR
TOENTERINGTHEBOILER0LUGGINGOFTHEDOMESTICSYSTEMBYSCALING
ORACCUMULATIONOFDIRTISNOTTHERESPONSIBILITYOF7ILLIAMSON
Thermoflo, and suitable steps must be taken to avoid it.
s #LEANINGREFERTOTHEINSTALLATIONMANUALMAINTENANCESECTIONFOR
THEPROPERCLEANINGPROCEDUREFORTHEPLATE$(7HEATEXCHANGER
ANDTHEREQUIREDCLEANINGFREQUENCY
Minimum
Maximum
$(7
0RESSURE
2ATING
03)'
4.5
130
Hot Water Can Scald!
s #ONSUMER0RODUCT3AFETY#OMMISSIONANDSOME
states recommend domestic hot water tempera-
TUREOF&ORLESS
s
When installing an automatic mixing valve, se-
lection and installation must comply with valve
MANUFACTURERSRECOMMENDATIONSANDINSTRUCTIONS
s 7ATERHEATEDTOATEMPERATURESUITABLEFORCLOTHES
washing, dish washing and other sanitizing needs
will scald and cause injury.
s #HILDREN ELDERLY INFIRM OR PHYSICALLY HANDI
-
capped persons are more likely to be injured by
hot water. Never leave them unattended in or near
a bathtub, shower or sink. Never allow small chil-
DRENTOUSEAHOTWATERFAUCETORDRAWTHEIROWN
BATH)FANYONEUSINGHOTWATERINTHEBUILDING
lTSTHISDESCRIPTIONORIFSTATELAWSORLOCALCODES
require certain water temperatures at hot water
FAUCETSTAKESPECIALPRECAUTIONS
s
Install automatic mixing valve set according to
those standards.
s
Use lowest practical temperature setting.
s #HECKWATER TEMPERATUREIMMEDIATELYAFTERlRST
HEATINGCYCLEANDAFTERANYADJUSTMENT
)FTHEBOILERPIPINGSYSTEMISCONNECTEDTOHEATINGCOILS
located in air handling units where there may be exposed
TOREFRIGERATEDAIRCIRCULATIONTHENITMUSTBE EQUIPPED
with flow control valves or other automatic means to
PREVENTGRAVITYCIRCULATIONOFTHEBOILERWATERDURINGTHE
cooling cycle.
4OPIPE$(7
1. Size piping no smaller than flat plate heat exchanges
inlet and outlet.
2. Additional anti-scald devices may be installed at each
HOTWATERFAUCETBATHANDSHOWEROUTLET
3.
)NHARDWATERAREASSOFTENCOLDDOMESTICSUPPLYWATER
to heaters to prevent scale build-up.
4.
2EFERTO
Figure 43
BELOWFORMAXIMUMANDMINIMUM
DOMESTICWATERPRESSURERATINGFOROURUNITSONTHE
domestic pipes (Combi only).
5.
)NSTALLlELDSUPPLIED DOMESTICWATERPRESSURERELIEF
VALVEWITHAMAXIMUMPRESSURERATINGOFPOUNDS
Figure 43
$OMESTICWATERPRESSURERATING
Figure 44
$(7INLETHASAlLTERSCREEN
6. Combi Boiler
: Domestic water inlet connection showing filter
SCREENTOPROTECTPADDLEmOWSWITCHFROMSANDANDOTHERDEBRIS
Pipe in a “union” fitting below this adapter to service
this filter screen.