User Guide

Burners with Flame Retention Heads

This type of firing is

standard on all new equipment and most upgraded conversions.

As the name implies (flame retention), the flame front is retained,

or locked in close to the burner head. This is accomplished by

means of a specially designed disc, with slots or edges over which

the air flows, creating a recirculating airflow.

Properly designed and located, a flame retention head produces

an efficient, compact, bushy fire that is free from smoke or

excessive noise.

Nozzle selection for a specific burner should be in accordance with

the manufacturer’s instructions for angle and pattern.

Burners with Flow Rates up to 2.00 GPH

Hollow cone

nozzles can be used successfully for most applications, even on

burners with the highest air velocity in the center of the pattern.

Generally, conventional or Shell Head burners can utilize hollow

cone nozzles. In cases where more fuel is needed near the center,

it may be advisable to select a nozzle with a narrower spray angle,

or a solid cone type. Hollow cone nozzles in the smaller burners

assure the quietest possible operation. That’s why they are

sometimes used even if it means sacrificing CO

. Type A and B

Del-O-Flo can be used in place of standard A and B nozzles. A

Type W nozzle can also be used with success.

Burners with Flow Rates Between 2.00 and 3.00 GPH

Hollow or solid nozzles may be selected, depending upon burner

air pattern. This range apparently is not as critical, therefore not

subject to some of the problems found either above or below this

range.

Burners with Flow Rates above 3.00 GPH

Here it’s

advisable to start with solid cone nozzles which produce smoother

ignition in most burners at these higher flow rates. Burners with

hollow air patterns are the exception. It is also interesting to note

that in this flow range, pulsation is not as prevalent as in the

smaller sizes.