132.3 CHECKING OPERATION OF THE GAS SYSTEMCheck that the appliance has been prepared (category and type of gas) equivalent to thefamily of gas available on site. If not, it is necessary to convert the appliance to whatever isavailable. See the paragraph “Conversion to other types of gas”.The appliance must be used with the correct injectors for its thermal power rating (See table5 in the “Technical data”).The operation of the appliance with its heating capacity depends on the inlet pressure andthe calorific power of the gas.The pressure range (inlet pressure) within which the appliance is allowed to operated isstated in table 6b “Inlet pressure” of the paragraph “Technical Data”. The appliance shall notbe operated out of the given pressure range. If pressure should differ from the figures statedin table 6b, advise the gas board or the company which has installed the system.The lower calorific value of the gas can be checked with the supply company or agency, andshould comply with the information given in table 5 “Gas data” in the “Technical data”heading.2.3.1 CONTROL OF GAS INLET PRESSUREThe feed pressure is measured using a liquid pressure gauge ( e.g. a U-shaped pressuregauge, minimum definition 0.1 mbar). The supply pressure can be measured directly at theinlet pressure intake on the gas feed pipe. The inlet pressure intake can be reached byopening the lower front panel once the two side screws have been removed. (See figure“Measuring the inlet pressure ”).Before connecting the manometer, the screw of the pressure port must be loosened.Connect the U-shaped pressure gauge while the appliance is operating to measurepressure.The pressure reading on the gauge should be in the admitted pressure range stated in table6b “Inlet pressures” of paragraph “Technical data”.If pressure figures should not be correct, apply to the gas board or the company which hasinstalled the system.Having read the pressure, re-tighten the screw carefully.Warning! The sealed adjuster screws on the gas solenoid valve must not be tampered with,otherwise any guarantee rights shall be forfeited immediately.2.3.2 CONTROL OF PRIMARY AIR FLOWPrimary air can be considered correctly adjusted if no flame lift is ensured when the burner iscold and the injector lights when the burner is hot.The distance “H” (refer to Section 4.6 “Primary air regulation”) recommended for primary airadjustment is stated in table 5 in the “Technical data”.