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6. Check that the electrical connection and boiler room ventilation conform to the relevant standards. 7. Switch the on/off switch to the ON position. 8. Set the temperature settings (see pages 15-16). 9. Check the gas supply pressure (see page 13). 10. When the burner operates, check the chimney connection for leaks. 11. After 5 minutes of operation, turn the boiler off and vent the heating circuit system again maintaining the water pressure at 1 bar. 12. Then restart the unit and check the combustion (see page 13). Burner troubleshooting See page 15-17 Spare parts Refer to the specific document available from ACV or your distributor. BURNER FEATURES ACV BG 2000-M MODULATING PREMIX GAS BURNERS Description of operation: The BG 2000-M modulating burner continually adjusts output to demand, improving operating efficiency. The burner tube is coated with metal fibre (NIT) which, in addition to its remarkable heat exchange capabilities, gives greater durability. The main components are a venturi and one (model 71) or two (model 101) gas valves, technology specially developed by Honeywell for low Nox premix air/gas burners with automatic ignition and ionisation flame detection. The pressure at the gas valve outlet is equal to the air pressure in the neck of the venturi, less the offset. The fan sucks combustion air through the venturi, into which the gas inlet emerges. As it passes through, the air produces a pressure differential in the constriction of the venturi and sucks the gas into the venturi outlet. A perfect mix of air and gas then passes through the fan to the burner tube. This design ensures very quiet and safe operation: • If there is an air blockage, the pressure differential in the venturi falls, the gas flow diminshes, the flame goes out and the gas valve closes: the burner is in safety shutdown mode. • If there is a blockage in the chimney outlet, the air flow diminishes, and the same reactions as those described above cause the burner to shut down in safety mode. • The BG 2000-M burner fitted to the HeatMaster 71 and 101 is regulated by a MCBA controller (Honeywell) which controls burner operating safety as well as temperature modulation. BG 2000-M burners are preset at the factory for natural gas. Conversion to propane: Not applicable for Belgium. Conversion kit included with burner comprising: -Cap(s) -Nameplate(s) - Sticker with settings. - Mounting instructions. Air-gas mixture control system Venturi Fan Air Air - gas mixture Gas flow regulating screw Offset regulation screw Gas BURNER FEATURES 71/101 Gas burner features Type HM 71 HM 101 Input Output Combustion efficiency - natural gas Natural gas CO2 Kw Kw % % 22.0 - 69.9 18.4 - 63.0 92.0 9.0 25.0 - 107 / 22.0 - 110 (*) 23.0 - 96.3 / 20.2 - 99.0 (*) 92.1 9.5 Gas G20 - 20 mbar -I 2E(S)B - I 2 Er - I 2H Flow m3/h 2.12 - 7.40 2.64 - 11.32 Gas G25 - 20/25 mbar -I 2L - I 2ELL Flow m3/h 2.46 - 8.60 3.80 - 13.17 Gas G31 - 37/50 mbar -I 3P Flow m3/h 0.82 - 2.86 0.94 - 4.50 Pressure drop combustion chamber Flue gas temperature (net) Mass flow rate of combustion products (grammes per second) mbar °C 0.6 172 9.2 - 32.1 1.4 165 11.5 - 49.2 (*) propane Gas category BE FR AT DK ES UK IT PT IE SE NL LU DE I 2Er X I 2E(S)B X I 2H X X X X X X X X I 3P X X X X X X I 2L X I 2ELL X X BG 2000-M/71 BG 2000-M/101 Burner tube Ignition electrode Air collector Fan Gas valve Burner tube Air collector Ignition electrode Fan Gas valve Gas inlet Gas collector Gas inlet Casing top panel Burner chamber plate Casing top panel Burner chamber plate MAINTENANCE SERVICE INTERVALS ACV recommends that boilers should be serviced at least once a year. The burner must be serviced and tested by a competent engineer. If a boiler is subject to heavy use, it may require servicing more than once a year - consult ACV for advice. SERVICING THE BOILER 1. Turn OFF the on/off switch on the boiler control panel and isolate external electrical supply. 2. Turn off the gas supply to the boiler. 3. Remove the flue to gain access to the top of the boiler. 4. Remove the casing top panel and lift off the flue reduction collar by undoing the fastening bolts. 5. Remove the turbulators from the flue pipes for cleaning. 6. Unscrew the burner chamber plate and remove the burner. 7. Brush the flue pipes . 8. Clean the burner chamber and the burner. 9. Re-assemble turbulators, flue reduction collar and flue, checking that the gasket on the flue reduction collar is in good condition. Replace gasket if necessary. Chimney flue Flue reduction collar Flue pipe and turbulators Burner chamber SERVICING THE SAFETY DEVICES - Check that all thermostats and safety devices are working properly. -Test the safety valves on the central heating and hot water circuits. SERVICING THE BURNER -Check that the insulation and gasket on the burner chamber plate are in good condition - replace if necessary. -Check and clean the burner and electrodes. Replace electrodes if necessary (under normal use once a year). -Check that the s...

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