Beckett CF2500 Mount the Burner, Dust and Moisture Protect Against Dust, Maximum Firing Rate GPH

Table 2 - Air Tube Capacity Versus Firebox Pressure

Maximum Firing Rate GPH

		Firebox	No	10% Turndown
Model	Tube	Pressure	Reserve
				(GPH)
		(In W.C.)	Air
		0.0	25.0	22.5
CF2500& CF2500A		0.2	24.8	22.3
	KP	0.4	24.6	22.3
		0.6	24.5	22.1
		0.8	24.3	21.9
		1.0	24.1	21.7
		0.0	35.0	31.5
CF3500A		0.2	33.5	30.2
	KM/	0.4	32.0	28.8
	KR	0.6	30.2	27.2
		0.8	28.8	25.9
		1.0	27.1	24.4

Note: 10% turndown indicates sufficient reserve air to reduce the CO2 in the flue to 90% of its value.

Note: The above ratings may vary 5% due to variations in actual job conditions.

Stray Light

Protect Against Stray Light Lockout. Failure to follow these instructions could cause loss of burner

operation resulting in no heat, an unplanned process interruption, work stoppage and the potential for frozen plumbing or other cold weather property damage.

○The control must detect a dark, no-flame condition in order to start the burner or it will hold in the stray light lockout mode.

○Shield the burner view window from direct exposure to intense light.

Dust and Moisture

Protect Against Dust and

Moisture

Wet, dusty environments could lead to blocked air passages, corrosion damage to components, impaired combustion performance and result in asphyxiation, explosion or fire.

y This burner is designed for clean, dry installations.

y Electrical controls are not protected against rain or sprayed water.

y Keep the installation clear of dust, dirt, corrosive vapors, and moisture.

y Protective covers and more frequent maintenance may be required.

Section: Mount the Burner

Mount the Burner

Protect the Air Tube From

Overheating

Overheating could cause damage to the air tube and other combustion components leading to equipment malfunction and impaired combustion performance.

yThe end of the air tube must not extend into the combustion chamber unprotected unless it has been factory-tested and specified by the appliance manufacturer.

yPosition the end of the air tube 1/4” back from

flush with the refractory inside entry wall to prevent damage from overheating.

Mount Flange(s) on Air Tube

This section does not apply to burners with welded flanges.

○Do not install air tube on burner.

○For non-pressure firing flange, refer to Figure 4: Install gasket (item a) and flange (item c). Ignore the next paragraph.

○For pressure-firing flange, refer to Figure 4: Slide gasket (item a) onto the air tube, making sure the top of the air tube is up. Predrill holes in the pressure firing plate (item b) to match the appliance studs. Slide the pressure firing plate (item b) and flange (item c) onto the air tube as shown. Wrap ceramic fiber rope (not shown) around the air tube and press tightly into the inside diameter of the flange (item c).

○Slide the air tube (item d) into position in the appliance front. Tighten the flange-mounting-stud nuts. Set the insertion of the air tube so dimension G is 1/4” nominal.

○Pitch the air tube at 2° from horizontal as shown and secure the flange to the air tube.

Figure 4 – Mount Flange(s) on Air Tube

CF2500/CF3500 Burner Manual

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