3
1 General
1.1 Description of the boiler
Theboilershaveaheatingbodyincastiron,anatmospheric
gasburnerwithdualratingtotal premixandelectronicignition
usingan intermittent pilot burner
Therange proposes 4powers, from 66 to 116kW.
These boilers are supplied with a control panel fitted with
either:
Theseboilersaredeliveredwithacontrolmodule
Theseboilersaredeliveredassembled
1.2 Directives and Standards
Theseboilersare CE certified incompliance with European
directives:
- EN656
- Gasdevices 90/396/CEE
- Yields 92/42
- Electromagneticcompatibility 89/336,
accordingto standards EN500 81-1, EN 50082-1
- Theboilers are type B11(B11BS proposed in option)
- Lowvoltage" 73/23
Designed to be used in a heating circuit with hot water at
maximumtemperature of 90 °Cand a pressureof 5
bar.
The installation and maintenance of the device must be
ensured by a qualified professional, in complance with
currentlyenforcedregulations and rulesofthe art.
1
3
GAS 2
4
5
N03891.DSF
BAXI waiveranyliabilityforany damagesresulting
from work not complying with this manual or
performed by non qualified persons.
1.3 Operating principle
Controlcycle
Uponcommissionning,the1st flapofthemaingasvalve(1)
opensandanignitor(2)ensurestheautomaticignitionofthe
ignitor burner (3) (intermittent pilot burner) with a flame
monitoredbyanionisingprobe,whichremainslitconstantly
duringthecommissionningofthemainburner(4).Thesetis
controlled by a contoller unit authorising the opening of the
mainvalve(1)andauxiliaryvalve(5)(for7and8elements).
Duringregulation,thesafetydevicesareself-checkedbefore
ignitionofthemainburner,byshortstoppageandrestarting
oftheignitionburner.
Operation:
- themainvalvehasareducedrating(1st rating),factoryset
to 60% nominal rating (2nd rating).
- theboiler’sthermostathastwostages(60%and2nd rating
100%)
- whentheboiler’stemperaturereachesthesetpoint ofthe
2nd rating,themainvalveswitchestoreducedrating.Ifthe
temperature reaches the setpoint of the 1st rating, the
thermostatstopstheburner’soperation.
- Thetemperaturedifferencebetweenthe1ststagesetpoint
and the 2nd setpoint is 10 °C.
The boilers are fitted to operate with natural gas
group G 20 - 20 mbar. For any gas change see
chapter 4.4.
BAXI certify compliance of all boilers mentioned in
this manual in reference to the appliances of the
correspondingtypes,havingtherightsofuseofthe
EC Marking according to the European Directives
for "Gas appliances" and "Boiler yields".
