baltur GI MIST 1000 DSPGM Manual De Instrucciones página 57

DESCRIPTION OF GAS PRESSURE SWITCH
WORKING
The minimum and maximum gas pressure control switches have the
aim of preventing the burner from working when the gas pressure
goes outside the pre-set limits. The specific working of the pressure
switches naturally means that the minimum pressure control switch
uses the NO contact (normally open) to closed when the pressure
switch detects a pressure greater than that set. Similarly the ma-
ximum pressure switch acts on the NC contact (normally closed)
so that it is closed when the pressure switch detects a pressure
below that set. The adjustment of the minimum and maximum gas
pressure switches must therefore take place when the burner is
being tested, according to the pressure found from time to time.
The pressure switches are electrically connected in series, so the
intervention (i.e. circuit opening) of any of the pressure switches
when the burner is working (flame on) causes the burner to shut
down immediately. Adjustment before switching on the burner: adjust
the minimum pressure switch at the scale's minimum and adjust the
maximum pressure switch at the scale's maximum. Adjustment after
burner calibration: With the burner at its maximum output, adjust
the minimum pressure switch by increasing the calibration until the
burner switches off, read the calibration setting on the adjustment
ring nut and set this to 5 mbar less . With the burner off, adjust the
maximum pressure switch by reducing the calibration until the NC
contact (normally closed) opens. Read the on the adjustment ring
nut and adjust this by increasing it by 5 mbar.
Note: the pressure switch will be for minimum pressure if there is
only one of these mounted on the gas train.
DETAILS OF THE MODULATION CONTROL
MOTOR SQM 10 AND SQM 20 FOR REGULATION
OF CAMS
To modify the regulation of the 3 cams utilized, operate the
respective red rings ( A - Z - M ).
By pushing with enough force, in the direction desired, each red
ring will rotate with respect to the reference scale. The index of the
red ring indicates on the respective reference scale the rotation
angle taken up for each cam.
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Reference Index
Camsshaft
Adjustable Cams
Maximum air
opening
end of the run
Total air closure
(burner at a standstill)
Air ignition opening
B = Insertion and disinsertion lever
motor connection Camshaft
Position 1 = Disinsertion
Position 2 = Insertion
E
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