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5.5.3
Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 46) after having per-
formed all the other burner adjustments with the pressure switch
set at the start of the scale.
With the burner operating at MAX output, increase adjustment
pressure by slowly turning the relative dial clockwise until the burn-
er locks out.
Then turn the dial anti-clockwise by 0.8" WC and repeat burner
starting to ensure it is uniform.
If the burner locks out again, turn the dial anti-clockwise again by
0.4" WC.
5.5.4
Low oil pressure switch
The low oil pressure switch is factory set to 261 PSI (18 bar).
If the oil pressure goes down this value in the delivery piping, the
pressure switch stops the burner.
Burner starts again automatically if the pressure goes above
261 PSI (18 bar) after burner start up.
5.5.5
High oil pressure switch
The high oil pressure switch is factory set to 43.5 PSI (3 bar).
If the oil pressure goes above this value in the return piping, the
pressure switch stops the burner.
Burner starts again automatically if the pressure goes down under
43.5 PSI (3 bar) after burner shut down.
If a loop circuit with Px pressure feeds the burner, the pressure
switch should be adjusted to Px + 43.5 PSI.
For the adjustment, see (Fig. 47).
Start-up, calibration and operation of the burner
33
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D10627
GB
D9290
Fig. 46
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Fig. 47
20031446
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