baltur GI MIST 1000 DSPGM Manual De Instrucciones página 54

DESCRIPTION OF THE WORKING OF THE
DIFFERENTIAL AIR PRESSURE SWITCH
The air pressure switch has the purpose of switching the equip-
ment 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 pressure), 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
E
shuts down. Adjustment before switching on the burner: adjust the
pressure switch at minimum. Adjustment after burner calibration:
N
connect a manometer to the pressure switch's positive (+) pressure
G intake and another manometer at the pressure switch's negative
pressure (-) intake. Check at what point in the modulation there is
L
the smallest pressure difference (∆ p) and adjust the pressure switch
to the midpoint of this difference. Example: positive value + 1.5 mbar
I
, negative value – 0.5 mbar, difference +2 mbar, setting 2:2 = 1 .
S
H
BURNER GI 1000 DSPGN GAS PILOT
ADJUSTMENT PRINCIPLE DIAGRAM
BURNER MODEL GI 1000 DSPGN MODULATION
GROUP DETAIL WITH SERVOMOTOR
1 - Device for the air regulation at the head
2 - Modulating disks
4 - Air combustion gate adjustment screws
5 - Butterfly valve, controlling the gas delivery,
adjustment screws
6 - Butterfly valve, controlling the gas delivery adjustment,
minimum position micro-switch cam
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