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NORA Oilheat Technicians Manual

Non-flame Retention Flame Retention (Turbulator or Choke) Head Burners Percent CO2 7-9 11-13 Percent Excess Combustion Air 50-100 20-30 Bacharach Smoke Number 1-3 0-1 Percent Flue Heat Loss (on cycle) 30 10-20 Figure 1-4: Comparison of burner performance Nozzle Combustion Air Chapter 1—Introduction to Oil Burners 1-5 higher than with older burners. See Figures 1-4 and 1-5. Flame retention heads produce hotter flames because less excess combustion air is used than with non-flame retention head oilburners. Therefore, the combustion chamber construction materials and general condition must be checked carefully whenever a high efficiency oilburner is installed or serviced. Construction of the high-pressure atomizing flame retention oilburners The high-pressure retention head burners are precision-built and constructed for durability and long service. Every high-pressure burner consists of a Figure 1-5: Difference in flame between a nonflame retention burner and a flame retention burner motor, fan (C), fuel unit (A), ignition transformer or igniter (E), nozzle assembly (B & D), and a housing to which all of these parts are attached, as illustrated in Figure 1-6 on following page. Motor The electric motor drives the fan and the fuel pump. The motor is manufactured in one of two designs, either a split phase type or permanent split capacitor (PSC) type motor. The motor is mounted to the housing of the burner by means of a two, three, or four bolt flange. Removing these bolts allows easy removal of the motor and access to the fan, which is attached to the motor shaft. In the event of motor failure, be sure Chapter 1 Intro to Oil Burners Non-Flame Retention Combustion Flame Retention Combustion Combustion Chamber Target Wall Nozzle Air Vanes Non-Flame Retention Combustion Head Rear View Cast Iron Combustion Chamber (Optional) Combustion Air Circumferential Slots Radial Vanes Flame Retention Combustion Head Rear View Stainless Steel


NORA Oilheat Technicians Manual
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