Uno - Installation Manual

4. GAS ADJUSTMENTS TABLE

4. GAS ADJUSTMENTS TABLE 2.0 CATEGORY II2H3+ Methane Gas G20 Liquid Butane Gas G30 Liquid Propane Gas G31 Lower Wobbe Index (15°C;1013mbar) Nominal Delivery Pressure Minimum Delivery Pressure MJ/m 3 h mbar mbar 45.67 20 17 80.58 29 20 80.58 37 25 23 MFFI Main Burner: n. 13 jets (ø) Consumption (15°C; 1013mbar) Consumption (15°C; 1013mbar) Gas Cock Outlet Pressure max - min mm mc/h Kg/h mbar 1.35 1.16 - 2.75 ---- 10.9 - 2.1 0.78 ---- 0.86 - 2.04 (*) - 5.8 0.78 ---- 0.85 - 2.01 (*) - 6.5 [1 mbar = 10,197 mmc.a.] 4.1 CHANGING THE TYPE OF GAS (*)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. 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 heating power setting (see par. 3.5); 5. Adjust the soft-light feature (see par. 3.5); 6. Adjust the ignition delay feature for the heating system (can be set on 0 or 2 mins. - see par. 3.5). 7. Adjust the self test ignition pressure. Jumper “M” used to set the self test ignition pressure of the boiler is set to position “B” for normal operation. To change the setting it is necessary to move the jumper to postion “A”, the red led will begin flash. This indicates that is now possible to adjust the self test ignition pressure by turning knob “A” (C.H. temperature adjustment). To store the new setting the jumper “M” must be moved back to postion “B”. TABLE 3.0 CATEGORY II2H3+ Methane Gas G20 Liquid Butane Gas G30 Liquid Propane Gas G31 Recommended Softlight Pressure (mbar) 4.6 13 13 Self Test ignition pressure (mbar) 5.1 13.5 16 20

5. MAINTENANCE It is recommended that the following inspections be carried out on the boiler at least once a year: 1 - Check the seals for the water connections; replace any faulty seals. 2 - Check the gas seals; replace any faulty gas seals. 3 - Visual check of the entire unit. 4 - Visual check of the combustion process or analysis of combustion byproducts (see section 3.6) and cleaning of the burner if needed. 5 - If called for by point. 3, dismantling and cleaning of the combustion chamber. 6 - If called for by point. 4, dismantling and cleaning of the burner jets. 7 - Visual check of the primary heat exchanger: - check for overheating in the blade assembly; - clean the exhaust fan if needed. 8 - Adjustment of the gas flow rate: ignition pressure, partial load and full load. 9 - Check the heating safety systems: - safety device for maximum temperature; - safety device for maximum pressure. 10- Check the gas safety systems: - safety device for lack of gas or flame ionisation (detection electrode); - safety device for gas cock. 11- Check the electrical connection (make sure it complies with the instructions in the manual). 12- Check of domestic hot water production efficiency (flow rate and temperature) 13- General check of the combustion by-products of the discharge/ventilation system. 14- Check the general performance of the unit. 21