Maximum Gas Pressure Switch; Minimum Gas Pressure Switch; Pvp Pressure Switch Kit - Riello RS 310/EV O2 ULX Installation, Use And Maintenance Instructions

5.5.2

Maximum gas pressure switch

Adjust the maximum gas pressure switch (Fig. 27) after making
all other burner adjustments with the maximum gas pressure
switch set to the end of the scale.
To calibrate the maximum gas pressure switch, open the tap and
then connect a pressure gauge to its pressure test point.
The maximum gas pressure switch must be regulated to a value
no higher than 30% of the measurement read on the gauge when
the burner is working at maximum output.
After making the adjustment, remove the pressure gauge and
close the tap.
5.5.3

Minimum gas pressure switch

Adjust the minimum gas pressure switch (Fig. 28) after having
adjusted the burner, the gas valves and the gas train stabiliser.
With the burner operating at maximum output:
– install a pressure gauge downstream of the gas train stabilis-
er (for example at the gas pressure test point on the burner
combustion head);
– choke slowly the manual gas cock until the pressure gauge
detects a decrease in the pressure read of about 0.1 kPa
(1 mbar). In this phase, verify the CO value which must al-
ways be less than 100 mg/kWh (93 ppm).
– Increase the adjustment of the gas pressure switch until it in-
tervenes, causing the burner shut-down;
– remove the pressure gauge and close the cock of the gas
pressure test point used for the measurement;
– open completely the manual gas cock.
1 kPa = 10 mbar
WARNING
5.5.4

PVP pressure switch kit

Adjust the pressure switch for the leak detection control (PVP kit)
(Fig. 29) according to the instructions supplied with the kit.
Start-up, calibration and operation of the burner
D3856
33 GB
PA
20181543
PGM
Fig. 27
D3855
Fig. 28
D3855
Fig. 29
20205511