The method of adjusting the air intake of internal combustion engine in natural gas boiler is to adjust or install throttle valve control on pressure switch. \x0d\① Remove the overpressure switch and explosion-proof needle on the explosion-proof port, take out the medium temperature sensor and take out the overtemperature switch. \x0d\② Set the vacuum target on the display screen to 25Kpa and convert the vacuum to 20Kpa. \x0d\③ Put the flue gas cut-off valve on the chimney in the open state, and put the gas ball valve in the open state. \x0d\④ Exhaust air through the ventilation pipe on the gas pipe, and close the ventilation valve after smelling the gas. \x0d\⑤ Install the portable pressure gauge on the pressure measuring point at the inlet end of the valve block. \x0d\⑥ Adjust the minimum gas pressure switch and wind pressure switch to the minimum scale, and open the burner to observe the gas butterfly valve (the gas butterfly valve should rotate to 90 when the burner is pre-blown with fire, and generally 25-30 when it is pre-blown with small fire). If not, you should stop the recorder first, and then adjust the servo motor to achieve it. \x0d\⑦ Turn the pressure adjusting screw on the valve block to the maximum opening, and start the burner for the first time. It is possible that starting the ignition twice is unsuccessful, which may be because the gas is impure or the damper is too big and the gas volume is small. \x0d\⑧ After the first successful ignition, keep the burner burning on a small fire, and check and adjust the flow (in general, the flow of small fire is about 65438+ 0/3 of the full-load gas consumption). After the flow rate of small fire is adjusted, switch to large fire combustion, check and adjust the flow rate (the flow rate of large fire is the air consumption when the unit is fully loaded) \ x0d \ 9 After the flow rate is adjusted, switch the burner to small fire operation and large fire operation respectively, adjust the throttle size according to the measured value on the oxygen content meter (generally, the oxygen content of flue gas after small fire combustion is 5%, and the oxygen content of flue gas after large fire combustion is about 3%), and adjust the throttle to a reasonable value. \ x0d \: Observe the change of gas pressure gauge at any time during debugging. If the pressure fails to meet the requirements or fluctuates too much, the unit may not burn normally. \x0d\ Let the burner run at the low fire position, turn the dial clockwise until the burner is locked, then turn the dial counterclockwise by 20% and start it again to ensure normal operation. If it still locks, please turn it a little counterclockwise until it works properly. \x0d\ Let the burner run on fire, turn the minimum gas pressure switch clockwise until the burner stops, then turn the minimum gas pressure switch counterclockwise for 2mbar, and turn on the burner again. If it stops, continue to turn the minimum gas pressure switch counterclockwise 1mbar.