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RWB 664850 Page 1 Printed in U.S.A.

THE EFFECT OF ELEVATION ON OIL BURNER FIRING

The elevation of the installation of a modern high-speed flame retention oil burner affects the

performance of the burner. Allowance for elevation must be taken into consideration when

choosing an oil burner and operating it above 2000 feet.

It is especially important in high elevation installations to adjust air settings to match the burner

nozzle firing rate. As elevation increases above sea level, the ambient air contains less oxygen.

Because there is less available oxygen per cubic foot of air, the burner must deliver a greater

volume flow (cfm) of air to provide the proper amount of oxygen for the amount of oil being

burned. This is the reason that an increase in the burner air setting may be required.

It is also important in high elevation installations to consider the maximum firing rate of the

burner, so that the heat input as required by the application and as recommended by the boiler

or furnace manufacturer is maintained. Regardless of elevation, the oil burner has a maximum

volume flow of air that it can deliver. As a result, the maximum firing rate of the oil burner

decreases as the elevation increases, because the combustion air contains less oxygen. An

increase in the size of a fixed-type retention head, an adjustment of the head position of a

variable-type head (to a higher or more open position), or even the use of an oil burner with a

higher maximum firing rate may be necessary.

Note that this re-rating is not de-rating. This Bulletin addresses re-rating of the burner

, not de-

rating of the heating appliance

. The firing rate (amount of BTU input) of the burner must be

maintained to meet the heating load that the appliance has been sized to meet. If a heating

appliance is de-rated

by reducing the firing rate of the oil burner (as is sometimes done to

increase efficiency), the BTU output of the appliance may not be adequate to meet the heating

load of the installation.

The effect of elevation up to 2000 feet is minimal, so no re-rate is necessary up to 2000 feet

elevation. Above 2000 feet, for every 1000 feet above sea level (including the first 2000 feet),

there is a 1.84% rate reduction of the burner. To assist you, we have included the following

chart and some examples:

Becket

TECHNICAL INFORMATION BULLETIN

AUGUST 2003

1 2 3 4

HEATING LOAD 2
Elevation 2

Résumé du contenu

Page 1

RWB 664850 Page 1 Printed in U.S.A. THE EFFECT OF ELEVATION ON OIL BURNER FIRING The elevation of the installation of a modern high-spee

Page 2 - Elevation

RWB 664850 Page 2 Printed in U.S.A. Note: All examples are for 7000 ft. elevation. 1.84% x 7 (for 7000 ft.) = 12.9%

Page 3

RWB 664850 Page 3 Printed in U.S.A. • If after the re-rate factor is used the required firing rate input exceeds the Adjusted Maximum Firing

Page 4

RWB 664850 Page 4 Printed in U.S.A. • If after the re-rate factor is used the required firing rate input exceeds the Adjusted Maximum Firing

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Beckett CF375 Manuel d'utilisateur

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