HOLLOW-CONE Type A -nozzles are mainly used on burners with a hollow cone air pattern and for through puts up to 2.00 GPH. The droplet distribution is concentrated on the outside of the cone and results in good ignition and low-noise combustion.

SOLID-CONE Type B -nozzles produce a spray that distributes droplets fairly uniformly throughout the complete pattern. The spray pattern becomes progressively more hollow at higher flow rates, particulary above 8.00 GPH. Provides smooth ignition and efficient combustion, particulary in larger burners.

Type W " ALL PURPOSE "-nozzles are neither truly hollow nor solid. These nozzles frequently can be used in place of either solid or hollow cone nozzles between 0.40 and 8.00 GPH, regardless of the burner's air pattern. The lower flow rates tend to be more solid.

Type AR-D Nozzles are of a "solid cone" type similar to Type B but with a slightly lower concentration of the droplets in the center of the cone. They are high performance in burners of low up to medium capacity (up to flows of 2.00 GPH).

Type R-D Nozzles have a high concentration of droplets in the center of the spray cone. They are particularly recommened for burners with a highly concentrated solid air pattern. The average droplet size is slightly coarser than on the Standard Solid Cone Type B.

Type .579 MH Mobile Home Nozzles are low-capacity nozzles designed for mobile home use. This design will minimize the usual plugging problems associated with low flow rates.

Semi-Solid nozzle (.50-2.00) 60 0 , 70 0 and 80 0 spray angles; interchanges with other SS nozzles.

Replacing a nozzle of one make with another sometimes presents problems. This is partly due to unique design differences among the various makes, plus the fact that the nozzle manufacturers use different methods for evaluating spray angles, patterns and spray quality. In many cases, nozzles with similar patterns and spray angles are directly interchangeable. However, there are other cases where nozzles that would seem to be equivalent really are not. When this happens it is best to ask the burner manufacturer for a recommendation. Otherwise, it is a matter of trial and error: (1) Trying nozzles with slightly higher or lower flow rates, (2) wider or narrower angles and (3) more solid or more hollow patterns, to see which one performs best.

*The original B Nozzle

WARNING: Improper modification to combustion units may create a

fire hazard resulting in possible injury. Contact the original equipment

manufacturer before modifying the combustion unit.

Proper nozzle selection is a subject of great importance because the performance of the nozzle is so directly related to the overall performance of the burner. The wrong choice of flow rate, spray angle or spray pattern for a given burner air pattern can result in improper firing.

To match a nozzle to a burner takes field-service experience, or trial-and-error, or a good foundation of understanding angles, rates and patterns. Refer to Delavan's service technicians guide #884, "A Total Look at Oil Burner Nozzles" for more technical information on nozzle selection and understanding angle, rates and patterns. Also refer to the Burner Manufacturers' Recommendations Chart below.

QB300 (140 PSI) 1.75-3.00 GPH 45 0 , 60 0 , 70 0 , 80 0 B

Weil-Mclain

*Effective November 1999. Subject to updating by burner manufacturers. For models not listed contact burner manufacturer. Always follow the appliance manufacturer's instructions for the correct nozzle specification.

WARNING: Improper modification to combustion units may create a fire hazard resulting in possible injury. Contact the original equipment manufacturer before modifying the combustion unit.

NOTE: Information on this chart is to be used as a general guide only.

Every nozzle is spray tested for flow rate, spray angle and spray quality. Our nozzles are flow rated at 100 psi. Test conditions include: fuel gravity within a total spread of 1-1/2 0 API . . . viscosity within ± .04 centistoke (.03 SSU) . . .pressure at 100 psi . . . fuel temperature at 80 0 F, ± 2 0 F . . . an

air-conditioned test area maintained at a temperature spread of 4 0 F or less . . . and regularly calibrated pressure gauges and flow meters.