Riello 836T1 - Minimum Gas Pressure Switch

20154249
28
GB
Start-up, calibration and operation of the burner
6.6.3 Minimum gas pressure switch
The purpose of the minimum gas pressure switch is to prevent
the burner from operating in an unsuitable way due to too low gas
pressure.
Adjust the minimum gas pressure switch (Fig. 34) 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 shutdown;
– remove the pressure gauge and close the cock of the gas
pressure test point used for the measurement;
– open completely the manual gas cock.
ATTENTION
1 kPa = 10 mbar
Fig. 34
D3855