Pressure Switch Adjustment; Air Pressure Switch - Check Co; Maximum Gas Pressure Switch; Minimum Gas Pressure Switch - Riello RS 1000/EV BLU Installation, Use And Maintenance Instructions

6.6

Pressure switch adjustment

6.6.1

Air pressure switch - check CO

Adjust the air pressure switch after performing all other burner
adjustments with the air pressure switch set to the start of the
scale (Fig. 34).
With the burner operating at MIN output, insert a combustion
analyser in the stack, slowly close the suction inlet of the fan (for
example, with a piece of cardboard) until the CO value does not
exceed 100 ppm.
Slowly turn the appropriate knob clockwise until the burner goes
into lockout.
Check the indication of the arrow pointing upwards on the gradu-
ated scale.
Turn the knob clockwise again, until the value shown on the scale
corresponds with the arrow pointing downwards, and so recover-
ing the hysteresis of the pressure switch shown by the white mark
on a blue background, between the two arrows. Now check the
correct start-up of the burner.
If the burner locks out again, turn the knob anticlockwise a little
bit more.
6.6.2

Maximum gas pressure switch

Adjust the maximum gas pressure switch after having performed
all the other burner adjustments with the maximum gas pressure
switch set at the end of the scale (Fig. 35).
With the burner operating at maximum output, lower the adjust-
ment pressure by slowly turning the relative knob anticlockwise
until the burner locks out.
Turn the knob clockwise by 0.2 kPa (2 mbar) and repeat the start-
up of the burner.
If the burner locks out again, turn the knob clockwise again by
0.1 kPa (1 mbar).
6.6.3

Minimum gas pressure switch

Adjust the minimum gas pressure switch after performing all the
other burner adjustments with the pressure switch set to the start
of the scale (Fig. 36).
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise until
the burner stops.
Then turn the knob anticlockwise by 0.2 kPa (2 mbar) and repeat
burner start-up to ensure it is uniform.
If the burner locks out again, turn the knob anticlockwise again by
0.1 kPa (1 mbar).
6.6.4

PVP pressure switch kit

Adjust the pressure switch for the leak detection control (PVP kit)
(Fig. 37) according to the instructions supplied with the kit.
1 kPa = 10 mbar
WARNING
Start-up, calibration and operation of the burner
29 GB
Fig. 34
D3854
Fig. 35
D3856
Fig. 36
D3855
Fig. 37
D3855
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