Riello 20155654, Installation, Use And Maintenance Instructions

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20155699 34 GB
Start-up, calibration and operation of the burner
6.6.3 Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 31) 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.
6.6.4 PVP pressure switch kit
Adjust the pressure switch for the leak detection control (PVP kit)
(Fig. 32) according to the instructions supplied with the kit.
6.7 Final checks (with burner operating)
Tab. M
WARNING
1 Kpa = 10 mbar
Fig. 31
D3855
Fig. 32
D3855

Open the thermostat/pressure switch TL

Open the thermostat/pressure switch TS

The burner must stop

Turn the gas maximum pressure switch knob to the mini-
mum end of scale position

Turn the air pressure switch knob to the maximum end of
scale position

The burner must stop in lockout

Turn off the burner and cut off the power

Disconnect the minimum gas pressure switch connector

The burner must not start

Darken the flame sensor

The burner must stop in lockout due to ignition failure
WARNING
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.