Adjusting Air On The Combustion Head (Methane Gas) - baltur GI 1000 Serie Mode D'emploi

ADJUSTING AIR ON THE COMBUSTION HEAD
The combustion head is equipped with a device that automatically regulates the passage between the diffusor disk
and the head, admitting combustion air to the head. This passage can be restricted to obtain high pressure upstream
of the diffusor disk, even with low fuel throughput, so that high velocity and turbulence ensure that the air penetrates
the gas more thoroughly, giving an optimum fuel/air mixture and a stable flame.
With gas burners, it can be essential to have high air pressure on the diffusor inlet side if pulsation of the flame is to
be prevented, especially where the burner operates in a high pressure combustion chamber, or in high thermal load
conditions. Accordingly, the head must be adjusted in such a way that a substantially high pressure is always
generated upstream of the diffusor. It is recommended that the passage of air allowed through to the head be
restricted in such a way that there is a generous opening of the air shutter regulating the air flow supplied by the
burner fan. To achieve this, adjust the screws on the modulation disk.
When the regulation is complete, remember to tighten the screws locking the regulator screws.
DESCRIPTION OF THE WORKING OF THE DIFFERENTIAL AIR PRESSURE SWITCH
The air pressure switch has the purpose of switching the equipment into the
safety (lock-out) state if the air pressure is not what it should be. The pressure
switch must therefore be adjusted so that it is triggered to close the NO contact
(normally open) when the air pressure in the burner reaches a particular value.
The connection circuit of the pressure switch is self-controlling so that the NC
contact (normally closed) which is meant to be closed at rest (with the fan stopped
and consequent lack of air pressure in the burner), must actually achieve this
condition, if it does not the command and control equipment is not switched on
(the burner is stopped). Specifically, if the NO contact is not closed (normally
open) as it should be during working (this may be due to insufficient air pres-
sure), the equipment carries out its working cycle but does not switch on the
ignition transformer and does not open the gas pilot light valve so the burner
shuts down. Adjustment before switching on the burner: adjust the pressure
switch at minimum. Adjustment after burner calibration: connect a manometer
to the pressure switch's positive (+) pressure intake and another manometer at
the pressure switch's negative pressure (-) intake. Check at what point in the
modulation there is the smallest pressure difference (∆ p) and adjust the pres-
sure switch to the midpoint of this difference. Example: positive value + 1.5
mbar , negative value – 0.5 mbar, difference +2 mbar, setting 2:2 = 1 .
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