valutazioni - 3, GPA: 3.7 ( )

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The best maximum-power test conditions for the heating system are when the selector “C” is turned to the flue analysis setting. The discharge/ventilation of the exhaust fumes can be monitored to check for losses in general pressure in the system. This is done to eliminate the cause of lighting failure with the main burner not indicated by a shutdown status. With a differential manometer connected to the test socket on the combustion chamber, the DP value for the air pressure switch can be taken. The measured value should not be less than 10 mbar under maximum thermal power conditions (with the knob “C” on the flue test setting) in order for the unit to function properly and without interruption. The boiler is equipped with the following safety systems (see section 3.3 for references): 1 - Ignition Failure This control signals an ignition failure on the burner 7 seconds after a lighting failure. The L.E.D. “B”.will turn on to signal the shutdown status. The system can be reset by pressing and releasing the button “A” after checking to make sure that the gas valve is open. Repeat this process until the burner lights. 2 - Circulation Failure This control signals that the safety pressure switch on the primary circuit has not sensed a pressure of at least 1 bar within 40 seconds of the activation of the circulation pump, it shuts off the boiler and lights the L.E.D. “D”. The system can be reset (after the pressure has been brought up to the proper level) by using the On/Off switch “L”. 3 - Overheating This control shuts off the boiler in the case where the primary circuit reaches a temperature in excess of 110°C. The L.E.D. “G” will come on to signal this shut 20 B023 off status. After the system has been allowed to cool, the system can be reset by pressing the button “A”. 4 - Limescale Build-up This is an indirect control (actuated through the regulation of the temperature in the primary heat exchanger) on the formation of limescale in the secondary heat exchanger. Regardless of the flow rate and the temperature in the circuit for the domestic hot water, the temperature is limited to 62°C. 5 - Safety Shut-off At the start of every lighting phase, the P.C.B. performs a series of internal controls. If a malfunction occurs, the boiler will shutdown until the problem has been resolved. 3.9 Draining the System Draining the heating system. The heating system must be emptied as follows: -Turn off the boiler; -Open the drain valve for the system and place a container below to catch the water that comes out; - Empty the system at the lowest points (where present). If you plan on not using the heating system for an extended period of time, it is recommended that you add antifreeze with an ethylene glycol base to the water in the heating lines and radiators if the ambient temperature drops below 0°C during the winter. This makes repeated draining of the entire system unnecessary. Draining the domestic hot water system. Whenever there is the danger of the temperature dropping below the freezing point, the domestic hot water system must be drained as follows: -Turn off the general water valve for the household plumbing system; -Turn on all the hot and cold water taps; -Empty the remaining water from the lowest points in the system (where present). 4. GAS ADJUSTMENTS CATEGORY II2H3+ Methane Gas G20 Liquid Butane Gas G30 Liquid Propane Gas G31 Lower Wobbe Index (15°C;1013mbar) MJ/m3h 45.67 80.58 70.69 Nominal Delivery Pressure mbar 20 30 37 Minimum Delivery Pressure mbar 17 20 25 A/23 MFFI Main Burner: n. 13 jets (o) mm 1.,25 0.72 0.72 Consumption (15°C; 1013mbar) mc/h 2.72 -------- Consumption (15°C; 1013mbar) Kg/h ----2.02 2.02 Gas Cock Outlet Pressure min - max mbar 11.4- 2.0 27.5 (*) - 5.2 35.0 (*) - 7.0 A/27 MFFI Main Burner: n. 15 jets (o) 1.25 0.72 0.72 Consumption (15°C; 1013mbar) mc/h 3.16 -------- Consumption (15°C; 1013mbar) Kg/h ----2.35 2.32 Gas Cock Outlet Pressure: max - min mbar 11.6-2.2 (*) - 4.8 (*) - 6.0 (1mbar = 10,197 column of water) The outlet pressure of the gas cock is obtained by completely loosening the screw on the solenoid. The maximum pressure of the gas to the burner will be equal to the nominal delivery pressure minus the head loss within the gas valve. B023 21 4.1 Changing the Type of Gas The boiler can be converted to use either methane (natural) gas (G20) or LPG (G30 - G31) by an Authorised Service Centre. The operations that must be performed are the following: 1. Replace the jets on the main burner (see table in section 4); 2. Adjust the maximum and minimum thermal capacity values for the boiler (see table in section 4); 3. Replace the gas rating plate; 4. Adjust the maximum thermal power setting; CA TEGOR Y II2H3+ Methane Gas G20 Liquid Butane Gas G30 Liquid Pr opane Gas G31 Recommended Soft-Light Pressure (mbar) 5-5.5 17 - 18 18 - 19 5. MAINTENANCE 5. Adjust the soft-light feature; 6. Adjust the ignition delay feature for the heating system (can be set from 0 to 2 mins.). It is recommend...

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