3- Check the general condition of the appliance and of the combustion chamber visually.
4- Visual check of the combustion: clean burners if necessary.
5- With reference to point 3, dismantle and clean the combustion chamber if necessary.
6- With reference to point 4, dismantle and clean the injectors if necessary.
7- Visual check of the primary heat exchanger:
-check for overheating of the exchangers fins;
-clean the exhaust side of the exchanger and fan if necessary.
8- Regulate the gas pressure, ignition pressure, partial flame, maximum flame.
9- Check proper operation of the heating safety system:
-maximum safety temperature;
-maximum safety pressure.
10- Check the proper operation of the gas safety system:
-gas or flame safety device;
-gas valve safety device.
11- Check that the electrical connections have been made in compliance with the instructions shown in the Installation Instructions.
12- Check the efficiency of the hot water supply (flow and temperature).
13- Check general operation of the appliance.
14- Check the exhaust system for the combustion products.
1.2Technical Information
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| 23 MFFI | 27 MFFI | 27 RFFI SYSTEM | 30 MFFI |
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CE Certification |
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Heat Input | max/min | kW | 25.6/11.0 | 29.8/12.0 | 29.8/12.0 | 33.0/12.0 |
Heat Output | max/min | kW | 23.1/9.2 | 27.3/10.1 | 27.3/10.1 | 30.3/10.2 |
Efficiency of Nominal Heat Input | % |
| 90.2 | 91.6 | 91.6 | 92.0 |
Efficiency at 30% of Nominal Heat Input | % |
| 87.8 | 88.3 | 88.3 | 88.6 |
Heat Loss to the Casing (³T=50°C) | % |
| 1.2 | 1.3 | 1.3 | 1.4 |
Flue Heat Loss with Burner Operating | % |
| 8.6 | 7.1 | 7.1 | 6.6 |
Flue Heat Loss with Burner Off | % |
| 0.4 | 0.4 | 0.4 | 0.4 |
Maximum Discharge of Fumes | Kg/h |
| 59 | 62 | 62 | 61 |
Residual Discharge Head | mbar |
| 1.15 | 1.4 | 1.4 | 1.4 |
Consumption at Nominal Capacity | m3/h |
| 2.72/3.32 | 3.16/3.86 | 3.16/3.86 | 3.49/4.05 |
Gas Consumption after 10 Minutes* | m3 |
| 0.32/0.39 | 0.37/0.45 | 0.37/0.45 | 0.41/0.47 |
(15°C, 1013 mbar) | Kg/h |
| 2.02/2.00 | 2.35/2.32 | 2.35/2.32 | 2.60/2.57 |
Temp. of exhaust fumes at nominal |
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capacity | °C |
| 137 | 128 | 128 | 135 |
CO2 Content | % |
| 5.8 | 6.6 | 6.6 | 7.5 |
O2 Content | % |
| 9.2 | 8.0 | 8.0 | 8.0 |
CO Content | ppm |
| 32 | 34 | 34 | 49 |
Minimum Ambient Temperature | °C |
| +5 | +5 | +5 | +5 |
Head Loss on Water Side (max) (³T=20°C) | mbar |
| 200 | 200 | 200 | 200 |
Residual Head of System | bar |
| 0.25 | 0.25 | 0.25 | 0.25 |
Heating Temperature | max/min °C | 82/42 | 82/42 | 82/42 | 82/42 | |
Domestic Hot Water Temperature | max/min | °C | 56/36 | 56/36 | 56/36 | |
D.H.W. Flow Rate ³T=35°C | l/min |
| 9.5 | 11.2 | 12.3 | |
D.H.W. Flow Rate ³T=35°C | gal/min |
| 2.1 | 2.5 | 2.7 | |
D.H.W. Flow Minimum Rate | l/min |
| 2.6 | 2.6 | 2.6 | |
Pressure of Domestic Hot Water | max/min bar | 6/0.2 | 6/0.2 | 6/.02 | ||
Expansion Vessel Capacity | l |
| 7 | 7 | 7 | 7 |
Expansion Vessel | bar |
| 1 | 1 | 1 | 1 |
Maximum Water Content in System | l |
| 145 | 145 | 145 | 145 |
Maximum Heating Pressure | bar |
| 3 | 3 | 3 | 3 |
Nominal Pressure Natural Gas | mbar |
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Liquid Gas | mbar |
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Electrical Supply | V/Hz |
| 230 / 50 | 230 / 50 | 230 / 50 | 230 / 560 |
Power Consumption | W |
| 150 | 190 | 190 | 190 |
Protection Grade of Electrical System | IP |
| X4D | X4D | X4D | X4D |
Internal Fuse Rating |
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| FAST 2 AT | FAST 2 AT | FAST 2 AT | FAST 2 AT |
Weight | Kg |
| 47 | 47 | 46.5 | 47 |
G.C. Number
*Calculated at 70% maximum output
4 | B004 |