Gas Change; Gasskift - Baxi NUVOLA 28 Fi Installers And Users Instructions

High efficiency, fast-heating gas boilers with balanced flue for wall-mounting
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* CM5 connector for pump operation in the central heating mode
This connector, provided the jumper is set on 'ON', will keep the pump
running, when the boiler is in the central heating mode, although the room
thermostat switches off. If it is on 'OFF', the pump continues to run for 3
minutes.
* P5 T. RISC. potentiometer to adjust the burner-restarting time (time
delay)
This potentiometer allows the time delay to be adjusted between 1 and 7
minutes, when the boiler starts to produce heat.

Gas change

This boiler may operate either with natural gas (G20) or liquid gas (G30);
the gas change must be effected by a Qualified Service Engineer.
Pictures G-H-I-L showh how to gain access to the burners.
*
Pull the main burner out of its seat;
*
replace the jets and tighten them fast to avoid gas leaks;
*
repeat all pressure setting operations;
*
after a gas change has taken place you must apply a new label
specifying the new type of gas used and the pressure settings.
* To adjust maximum and minimum settings according to the gas used
refer to the burner pressure values for heat output table given in the table
below.
Adjustment to maximum heat output
*
connect the positive component of the jet-pressure manometer (U pipe)
to the gas valve test nipple (14).
Connect the manometer negative component to a 'T' fitting in order to
maintain the connection between the combustion chamber and the
compensating nozzle of the gas fitting, the gas check test nipple (16)
and the manometer. (The same measurement can be carried out by
connecting the manometer to the test nipple (14) after removing the
front panel of the combustion chamber).
If a different method is used to measure the pressure of the burners,
different results may be obtained because the low pressure created in
the combustion chamber by the fan would not be taken into account;
*
open the gas cock and turn the selector switch (1) on summer (
*
open a hot water tap to reach a flow rate of at least 10 l/min;
Picture E
Billede E
Unscrew the screws securing
the boiler front panel
Skru de skruer ud, som
fastgør kedlens frontpanel
921.968.2.00.02.010702
* CM5 konnektor til pumpedrift i centralvarmefunktionen
Denne konnektor vil, hvis forbindelsen er stillet på 'ON', holde pumpen
igang, konstant når kedlen arbejder i centralvarmefunktionen (selvom
rumtermostaten afbryder). Hvis den stilles på 'OFF', har pumpen 3 min.
efterløb.
* P5 T. RISC. potentiometer justering af brœnderens genindkoblingstid-
(tidsforsinhelse)
Dette potentiometer gør det muligt at justere tidsforsinkelsen mellem 1
og 7 minutter, når kedlen starter varmeproduktion.

Gasskift

Denne kedel kan fungere på enten naturgas (G20) eller flaskegas (G30).
Gasskiftet skal foretages af en autoriseret gastekniker.
Billederne G-H-I-L viser, hvordan man får adgang til brænderne.
*
Træk hovedbrænderen ud af sit sæde.
*
Udskift dyserne, og spænd dem godt fast for at forhindre gaslæk.
*
Gentag alle trykindstillingsoperationerne.
*
Efter et gasskift skal der påsættes en ny mærkat med specifikation af
den nye anvendte gastype samt trykindstillingerne.
* Til justering af minimum- og maksimumindstillingerne i henhold til den
anvendte gastype, skal man se nedenstående tabel over
brændertrykværdier for varme-output.
Justering maximal varmeydelse
*
Forbind den positive del af dysetrykmanometer (U-rør) til gasventilens
testnippel (14).
Forbind manometerets negative del til en 'T' fitting for at bevare
forbindelsen mellem brœndkammeret og gas armaturets
kompensationsstuds, gaskontrollens testnippel (16) og manometret.
(Samme måling kan foretages ved at forbinde manometeret til testnippel
(14) efter at have fjernet brœndkammerets frontpanel).
Hvis man måler brændernes tryk på forskellige måder, kan man opnå
forskellige resultater, fordi det lave tryk i brœndkammeret ved blæseren
ikke ville blive taget i betragtning:
*
Åbn gashanen, og drej vælgeren (1) til sommerdrift (
);
*
Åbn en varmtvandshane for at opnå en flowhastighed på min. 10 l/min.
27
).
Picture F
Billede F
Remove the combustion gases
chamber front cover
Fjern frontpanelet på
forbrændingsgaskammeret

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