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WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
Actions For Cleaning Of Heat Exchanger
Water Circuit
s $ISCONNECTTHEUNITFROMTHEELECTRICALPOWERSUPPLYUSING
THESWITCHANDORTHESPECIALCUTOFFDEVICES
s #LOSETHE VALVEOF(EATEXCHANGERSYSTEMSUPPLY  AND
RETURNPLACEDBEFORETHEBOILERCONNECTIONS
s 2ELEASETHEPRESSUREOF(EATEXCHANGERCIRCUITBYLOOSENTHE
plastic screw placed next to the Heat exchanger return (6).
s $ISCONNECTTHESYSTEMPIPINGFROMv.04(EATEXCHANGER
system supply (1) and Heat exchanger system return (5).
s Tighten the plastic screw placed next to the Heat exchanger
return (6).
s #ONNECTTHETWOHOSESOFTHESUPPLYFORCLEANINGTOTHEv
NPT Heat exchanger system supply (1) and Heat exchanger
SYSTEMRETURNCONNECTIONSONTHEBOTTOMOFTHEBOILER
s &ILLTHEPUMPTANKWITHWATERANDIFNECESSARYWITHCHEMI-
cal conditioners. Use chemical conditioners that are able to
REMOVEFROMTHEWALLSOFTHEPIPEOFTHEHEATEXCHANGERDE-
bris, lime scale, sludge, metal oxides and, in low temperature
SYSTEMSALSOBIOMASSWITHJUSTTHECIRCULATIONOFTHEWATER
with system hot and/or cold. The products used must not be
CORROSIVEANDORAGGRESSIVEFORMETALSANDPLASTICSANDMUST
NOTSIGNIlCANTLYALTERTHENATURALP(OFTHEWATER
s The processing time must be chosen according to the amount
OFDEPOSITSPRESENTINTHEEXCHANGERANDHOWEVERSUCHTIME
must always be less than the maximum treatment time speci-
lEDBYTHEMANUFACTURERONTHEPRODUCTDATASHEET
s !TTHEENDOFTHECLEANINGCYCLEEMPTYTHEPUMPFROMTHE
washing water with chemical and recover the product in
APPROPRIATECONTAINERSFORDISPOSAL
s &ILLTHEPUMPWITHWATERANDPERFORMAWASHINGCYCLEIN
order to remove the chemical conditioner still present within
THECOILSOFTHEHEATEXCHANGERRECOVERINGTHELIQUIDINSUIT-
ABLECONTAINERSFORDISPOSAL
s $ISCONNECTTHETWOHOSESOFTHEPUMPFROMTHEv.04
Heat exchanger system delivery (1) and Heat exchanger
system return (5) connections.
s Reconnect the system piping to 3/4” NPT Heat exchanger
system delivery (1) and Heat exchanger system return (5).
s /PENTHEVALVEOF(EATEXCHANGERSYSTEMSUPPLY AND
RETURNPLACEDBEFORETHEBOILERCONNECTIONS
s Reconnect the unit to the electrical power supply using the
SWITCHANDORTHESPECIALCUTOFFDEVICESANDTURNIT/.
s 0URGEAIRFROM(EATEXCHANGERWATERSYSTEMOFTHEBOILER
ASDESCRIBEDIN 5SER-ANUALSFORTHElRSTINSTALLATION OF
the boiler.
s Refill to correct pressure the Heat exchanger circuit.
s #HECKTHECORRECTOPERATIONOFTHEBOILER
33 Maintenance (continued)
Procedure for chemical cleaning of
DHW circuit
#AREFULLYREADANDFOLLOWTHEINSTRUCTIONSCONTAINEDINTHISIN-
struction booklet.
Chemical cleaning and maintenance must be carried out by pro-
FESSIONALLYQUALIlEDPERSONNELINCOMPLIANCEWITHTHECURRENT
REGULATIONSANDACCORDINGTOTHEMANUFACTURERSINSTRUCTIONS$O
not carry out any operation on the sealed control parts.
"EFORECARRYINGOUTANYCLEANINGORMAINTENANCEOPERATIONDIS-
CONNECTTHEUNITFROMTHEELECTRICALPOWERSUPPLYUSINGTHESWITCH
ANDORTHESPECIALCUTOFFDEVICES
4HEDISPOSAL OF CHEMICALS AND RESIDUESOF CHEMICALCLEANING
should be carried out in an appropriate manner, in accordance
with current standards.
)NTHEPRESENCEOFWATERHARDERTHAN&R&PPM#A#/
use suitably treated water in order to avoid possible scaling in
the boiler.
)F IT IS NECESSARYA CHEMICALCLEANING OF THE HEATEXCHANGERTO
RECOVERYTHEFUNCTIONALITYOFDOMESTICHOTWATERPRODUCTIONASA
RESULTOFPROLONGEDBOILEROPERATIONWITHUNTREATEDWATERAND
ORVERYHARDWATERFEEDINGCONDITIONSISALLOWEDTHEUSEOFPROD-
UCTSFORTHECHEMICALCLEANINGIFANDONLYIFTHEMANUFACTUREROF
these fluids provides a guarantee which ensures that its products
ARESUITABLEFORUSEANDCAUSENODAMAGETOTHEHEATEXCHANGER
OROTHERCOMPONENTSANDORMATERIALSOFTHEBOILERANDSYSTEM
4HISPROCEDUREISINTENDEDASAGUIDELINEFORACORRECTRESTORA-
TIONOFTHEFUNCTIONALITYOFDOMESTICHOTWATERPRODUCTIONAFTER
prolonged boiler operation with untreated water and/or very hard
WATERFEEDINGCONDITIONS
Figure 146"OILERCONNECTIONSFORCLEANINGDOMESTICWATER
CIRCUIT#OMBI/NLY
3YSTEMSUPPLY
$OMESTICHOTWATEROUTLET
3 Gas inlet
4 Cold water inlet
3YSTEMRETURN
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