baltur GI 1000 LX Manual De Instrucciones página 49

INSTRUCTIONS FOR ADJUSTMENT OF GAS VALVE MODEL SKP 75
ADJUSTMENT
From the aforementioned working principle it is clear
that this valve automatically increases the supply of gas
if the air supply increases and automatically reduces
the gas supply if the air supply drops Therefore the
quantity of gas supplied at burner "minimum" and at
burner "maximum" must be adjusted only be adjusting
the combustion air "minimum" and "maximum". In prac-
tice two "cams" adjust the minimum and the maximum
of the air regulation servomotor.
Bearing this principle in mind, we advice you to adjust
the burner according to the following procedure. To gain
access to the adjustment screws, remove lid "C". Adjust
the gas/air ratio with screw "B". This means turning
regulation screw "B" for the ratio of the gas pressure (at
the blast-pipe) and the air pressure (at the blast-pipe)
and to set, as an indicative initial regulation, reference
index "A", between 0.4 and 0.8: so that more air than
gas is being supplied.
NOTE: The air quantity, relative to the gas, is increased
by moving reference index "A" to smaller values,
while to increase gas quantities, relative to the
air, the reference index "A" towards higher val-
ues. Switch on the burner and run it with about
a 90% of maximum loading. Measure the CO
or O content and the CO in the fumes and cor-

rect the calibrated ratio with screw "B", until the
value obtained is the best possible.
Set burner at minimum, check CO
as well as CO in the fumes and correct, if necessary,
with regulation screw "D" (the change effected with
screw "D" is shown on index "E"). Turning towards
(-) there is a parallel shift in the curve for gas reduction
(excess air). Turning to (+) there is a parallel shift in the
curve for gas increase (lack of air).
To obtain good CO or O
 
sary to carry out a large parallel working curve change
and check once again the adjustment of the pressure
ratio at 90% working.
and O content
 
levels at low loads, it is neces-
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REV.: 13/09/2007