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Verify firing rate
• Refer to appliance manufacturer's instructions (if avail-
able) for firing rate and nozzle selection. Otherwise, the
maximum recommended firing rate for the burner depends
on the length of the firing chamber and the distance from
the burner center to the chamber floor. Verify that the cham-
ber dimensions are at least as large as the minimum values
given in
. If the appliance dimensions are smaller
Figure 1
than recommended, reduce the firing rate accordingly.
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:
Model CF2500A
: Tube
:
Tube
Model CF2500
: Tube
Model CF3500A
Tube
• 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
combination for maximum capacity rate. It requires a larger
I.D. flange No. 51631.)
• See
to verify the correct air tube length and air
Figure 2
tube combination code.
Figure 1 – Min. combustion chamber dimensions
L
Firing rate
17 gph
22 gph
27 gph
32 gph
35 gph
Form 6104 BCF-35-R0699
Instruction Manual
KP
— 17.0 to 19.9 GPH
— 17.0 to 25.0 GPH
KP
— 17.0 to 35.0 GPH
KM
— 17.0 to 35.0 GPH
KR
] is an optional air tube
A
Minimum dimensions
(all boilers)
A
L
10.5"
48.0"
11.5"
58.0"
12.5"
66.0"
12.5"
73.0"
13.0"
77.0"
– Model CF2500/CF3500 Oil Burner
Figure 2 – Air tube mounting dimensions
T
G
D
F
E
or
Install the burner with a 2° pitch as shown.
(A.T.C. = Air Tube Combination)
CF2500A/
CF2500
Tube KP
Dimensions
T
D
F
All — 6 ½"
3¼" All —
6¾"
CF 66 KP 8"
—
—
10¼" CF 102 KP 11 ½" CF 114 KM 11 ½" CF 114 KR
13¾" CF 136 KP 15"
17¾" CF 176 KP 19"
Table 2 – Air tube capacity vs. firebox pressure
Firebox
pressure
reserve
(In. W.C.)
0.0
25.0
0.2
24.8
0.4
24.6
3501
0.6
24.5
0.8
24.3
1.0
24.1
Note: 10% turndown indicates sufficient reserve air to reduce
the CO
in the flue to 90% of its value.
2
Note: The above ratings may vary 5% due to variations in actual job
conditions.
E Insertion depth
G Air tube to inside of chamber
– 0.25" ± 0.125"
T Air tube length
2°
1
D Tube diameter
3502
A.T.C. Codes
CF3500A
Tube KM
Tube KR
Dimensions
Dimensions
T
D
F
T
8"
4 ½" All — 9
CF 80 KM —
9 ¼"
CF 92 KM —
CF 150 KM 14"
CF 190 KM 19"
Tube KP
Tube KM/KR
No
No
10%
reserve
turndown
air
air
Maximum firing rate GPH
22.5
35.0
22.3
33.5
22.3
32.0
22.1
30.2
21.9
28.8
21.7
27.1
D
F
" 5
"
—
—
CF 140 KR
CF 190 KR
10%
turndown
31.5
30.2
28.8
27.2
25.9
24.4
5
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