36
GENERAL INSTUCTION
Adjustment of burner
Service
GENERAL INSTRUCTIONS
Adjustment of burner
The burner is from the factory pre-set to an average value that must then
be adjusted to the boiler in question. All burner adjustments must be made
in accordance with boiler manu-facturers instructions.These must include
the checking of fl ue gas temperatures, average water temperature and
CO
2
or O
2
concentration.
General instructions
The installation of the gas burner must be carried out in accordance with
current regulations and standards. The installers of gas burners should
therefore be acquainted with all regulations and ensure that the instal-
lation complies with the requirements. The installation, mounting and
adjustment should be made with the greatest care and only the correct
gas should be used.
Operating instructions
The operating instructions accompanying the burner should be left in a
prominent position in the boiler room.
Instructions
The user should be thoroughly in-structed in the function of the gas burner
and the whole installation. The supplier must instruct the user.
Inspection and maintenance
Daily inspection is advisable.
Start up
After the burner has been fi tted to the boiler and the electric connection,
the leakage control, the venting and the electric function test have been
carried out, the burner will be ready for start-up.
Howerer, study the sections dealing with adjustments of multi-bloc,
combustion air and combustion head. Open the ball valve and switch on
the main switch. If the burner starts the actual adjustment can be made.
Adjustment of burner head
The burner is equipped with an adjustment device changing the po si tion
of the brake plate in the burner head. This is used to adjust the cor rect
pressure drop over the com bus tion device in order to obtain a good
pulsation free combustion.
Which position to use depends on input and overpressure in the boiler. A
general rule is that the lower capacity the smaller the opening between
brake plate and combustion device.
Commissioning of installation
Control of the combustion. The combustion quality is checked by means
of a fl ue gas analysis device. Adjust the burner to appr. 20% excess air
in accordance with the table. Check the fl ue gas temperature. Calculate
the effi ciency. Check also the actual gas volume on the gas meter so
that the correct input is achieved.
Service
Service should only be carried out by qualifi ed personnel. Replacement
parts should be of the same make and approved by the same authori-
ties as the original. If the burner is converted to fi re another gas quality
it must be re-commissioned. If town gas is to be fi red the combustion
head must be converted and the gas train adjusted to suit (e.g.a larger
gas armature or a different spring in the governor may be required).
Gas quality
CO
2
% 0
2
%
max. CO
2
%
lambda 1,2
Natural gas
10,0
3,5
11,9
LPG
11,5 3,5 13,9
Summary of Contents for BG 550 LN
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