baltur GI Series Instruction page 29

COMBUSTION CHECK
For a correct air/gas ratio you have to get a carbon dioxide reading
(CO ) for the methane of at least 8% at the minimum burner supply
2
and up to the optimal level of 10% at maximum supply.
It is not advisable to exceed a 10% value or it could run with too
little excess air. This could in turn cause (with atmospheric pressure
changes, the presence of dust in the air ducts) significant quantities
of CO (carbon monoxide) to be present in the system. To prevent
dangerous situations from arising, it is essential to always
check, with a suitable instrument, that the percentage of carbon
monoxide (CO) present in the fumes is not greater than the
maximum permitted level of 0.1%.
ADJUSTEMENT OF THE AIR FLOW TO THE BURNER
HEAD (see BT 8769/1)
The burner head is fitted with a regulator control, which closes or
open the air passage between the disk and the head. By closing
the air passage, a high pressure on the disk can be achieved, for
low rates as well.
The increased speed and turbulence of the air makes it penetrate
with increased force, thus giving a better mixture and greater flame
stability. It may be essential to have high air pressure at the disk,
to stop flame pulsation.
This condition is practically indispensable when the burner is working
on a pressurized boiler and/or a high thermic load. It is clear from
the above description that the device that closes the air to the burner
head must be taken to a position where it always obtains a level
behind the disk that is much higher than the air pressure level.
It is recommended to set the device with the air to the head
closed off, so that a sizable opening is required on the
air shutter that controls the flow to the burner fan intake.
Obviously, this condition must occur when the burner is working at
the maximum desidered delivery rate. In practice, the setting opera-
tion shuld be started with the device that closed the air to the burner
head at an intermediate position, and the burner should be started
up for a trial setting procedure, as described previously. When the
maximum desired delivery rate is reached, adjust the position of the
device that closes the air to the burner head, moving it forwards or
backwards in order to achieve an adequate air flow in delivery, with
the intake air control shutter well open. When reducing the size of the
air passage to the burner head, avoid closing it completely. Ensure
that the burner head is perfectly centered in relation to the disk. If it
is not perfectly centered, the flame may burn badly and overheat the
head, causing rapid deterioration. The centering can be checked by
looking from the inspection hole on the rear part of the burner and
then fully tightening the screws (if present) that hold in position the
device that controls the air flow to the burner head.
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