Beckett CF2500 manual Verify Air Tube, Air Tube Combination Codes

Section: Pre-installation Checklist

Figure 2 - Dimensions: Minimum Combustion Chamber and Air Tube Mounting.

* Install burner with 2° pitch as shown.

T

1/4” ± 1/8”

H D *2°

L

E

Firing Rate	Minimum Dimensions
(gph)
	H	L
17	10.5”	48.0”
22	11.5”	58.0”
27	12.5”	66.0”
32	12.5”	73.0”
35	13.0”	77.0”

Air Tube Combination Codes

Model	Tube	Dimension	Dimension	Code	Dimension
		T	D		E
CF2500A/ CF2500		6-3/4”	6-1/2”	CF 66 KP	3-1/4”
	KP	10-1/4”	6-1/2”	CF 102 KP	3-1/4”
		13-3/4”	6-1/2”	CF 136 KP	3-1/4”
		17-3/4”	6-1/2”	CF 176 KP	3-1/4”
		8”	8”	CF 80 KM	4-1/2”
		9-1/4”	8”	CF 92 KM	4-1/2”
CF3500	KM	11-1/2”	8”	CF 114 KM	4-1/2”
		15”	8”	CF 150 KM	4-1/2”
		19”	8”	CF 190 KM	4-1/2”
		11-1/2”	9-15/16”	CF 114 KR	5-1/8”
	KR	14”	9-15/16”	CF 140 KR	5-1/8”
		19”	9-15/16”	CF 190 KR	5-1/8”

Verify Air Tube

The information in this section may be disregarded if the air tube is supplied by the appliance manufacturer.

The following tube arrangements are available –

○CF2500 - Tube KP -17.0.0 to 19.9 GPH

○CF2500A - Tube KP -17.0 to 25.0 GPH

○CF3500A - Tube KM -17.0 to 35.0 GPH or Tube KR -17.0 to 35.0 GPH

Maximum firing capacity depends on the firebox pressure. Use Table 2 to verify the correct air tube type for the firing rate required. (Tube KR [CF3500A] is an optional air tube combination for maximum capacity rate. It requires a larger I.D. flange Number 51631.)

See Figure 2 to verify the correct air tube length and air tube combination code.

Figure 3a - Firebox Pressure: CF2500A with no Reserve Air

U.S. GPH	25
	24
Rate
				KP
Firing
	23
Maximum	22	0.2	0.4	0.6	0.8	1.0
	0.0
		Firebox Pressure in Inches Water Column (W.C.)

Figure 3b - Firebox Pressure: CF3500 with no Reserve Air

U.S. GPH	35
	30
Firing Rate				KR
	25			KM
Maximum	20	0.2	0.4	0.6	0.8	1.0
	0.0
		Firebox Pressure in Inches Water Column (W.C.)

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