User Guide

A Reference Guide for the
Burner Service Technician
The complete oil heating system begins at the tank and
ends at the chimney. At the heart of the system is a tiny,
yet important piece of hardware — the nozzle. It
performs the vital functions that keep the flame
generating warm, comfortable heat. In fact, it plays
such a significant role in the entire system that we feel
the technician should know all about the nozzle.
In this reference guide, we’ll explore how the nozzle
works with other components of the system and give
you some oil nozzle facts that can help you maintain a
clean, reliable and economical heating system.
Contents Page
Why Use Nozzles? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What the Nozzle Does . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
How A Nozzle Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Nozzle Selection; Delavan Nozzles. . . . . . . . . . . . . . . . . . . 4
Nozzle Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Burner Manufacturers’ Nozzle Recommendations;
Nozzle Interchange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Flow Rate; Proper Flow Rates. . . . . . . . . . . . . . . . . . . . . . . 7
Determination of Proper Firing Rate for a House . . . . . . . 8
Spray Angle; Spray Pattern. . . . . . . . . . . . . . . . . . . . . . . . . 9
Burner Air Patterns; Recommended Combustion
Chamber Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Effects of Excess Air on Nozzle Performance;
What Affects Droplet Size? . . . . . . . . . . . . . . . . . . . . . 11
Effects of Pressure on Nozzle Performance . . . . . . . . . . 12
Effects of Pressure on Nozzle Flow Rate. . . . . . . . . . . . . 13
Effects of Viscosity on Nozzle Performance . . . . . . . . . . 14
Examples of Proper Nozzle Selection. . . . . . . . . . . . . . . . 15
Fuel Saving Devices for the Consumer . . . . . . . . . . . . . . 18
Preheaters and Chemical Additives. . . . . . . . . . . . . . . . . 18
Residential Oil Burner Adjustments for
Optimum Fuel Utilization . . . . . . . . . . . . . . . . . . . . . . . 19
Good Filtration Is Important. . . . . . . . . . . . . . . . . . . . . . . . 19
Clean Air Technology; ProTek™ Nozzle System . . . . . . . 20
Delavan Filtration Products; Nozzle Filters
and Strainers; Line Filter . . . . . . . . . . . . . . . . . . . . . . . 21
Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Nozzle Care and Service Tips . . . . . . . . . . . . . . . . . . . . . . 23
General Trouble Shooting Guide . . . . . . . . . . . . . . . . . . . 26
Questions Asked by Oil Heating Service Technicians . . 30
Other Delavan Nozzles Available . . . . . . . . . . . . . . . . . . . 33