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Model
Firing
Rate
(gph)
Minimum Dimensions
Refractory Lined Wet-based Boilers
HLHL
CF1400 0 to 5 7.0” 25.0” 7.0” 25.0”
5 to 10 8.0” 35.0” 8.0” 40.0”
CF2300 5 to 10 8.0” 35.0” 8.0” 40.0”
10 to 15 9.0” 40.0” 9.0” 50.0”
15 to 20 11.0” 55.0” 11.0” 60.0”
Note: 10% turndown indicates suffi cient reserve air
to reduce the CO
2
in the fl ue to 90% of its value. The
above ratings may vary 5% due to variations in actual
job conditions.
*CF2300 can fi re higher but is limited by UL
requirements.
Table 2 –
Air Tube Capacity Versus Firebox Pressure
Air Tube Capacity vs Firebox Pressure
Model Tube
Firebox
Pressure
(In W.C.)
No
Reserve Air
10% Turndown
(GPH)
CF1400
A
0.0 11.0 10.0
0.2 10.5 9.45
0.4 10.1 9.10
0.6 9.6 8.64
0.8 9.2 8.30
1.0 8.7 7.83
B
0.0 13.6 12.20
0.2 13.1 11.70
0.4 12.5 11.20
0.6 12.0 10.80
0.8 11.4 10.30
1.0 10.9 9.80
CF2300
A
0.0 19.9 19.90
0.2 19.2 19.10
0.4 18.5 18.30
0.6 17.9 17.60
0.8 17.2 16.80
1.0 16.5 16.00
B
0.0 19.9 19.90
0.2 19.7 19.60
0.4 19.5 19.30
0.6 19.4 19.10
0.8 19.2 18.80
1.0 19.0 18.50
The CF1400 maximum fi ring capacity depends
on the fi rebox pressure. Use Table 2 to verify the
correct air tube type for the fi ring rate required. Use
Tube B only when Tube A cannot provide the fi ring
rate required.
On the CF2300, there are two tube arrangements
available –
- Tube A — 7.0 to 19.9 GPH per Figure 3.
- Tube B — 10.0 to 19.9 GPH per Figure 3.
The CF2300 maximum fi ring capacity depends
on the fi rebox pressure. Use Table 2 to verify the
correct air tube type for the fi ring rate required. Use
Tube B only when Tube A cannot provide the fi ring
rate required.
See Figure 3 to verify the correct air tube length and
air tube combination code.
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○
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Air Tube Combination Codes
Model Tube
Dimension
T
Dimension
D
Code
Dimension
E
CF1400
A
6.75” 5.5” CF 66 KD 2.88”
10.25” 5.5” CF 102 KD 2.88”
13.75” 5.5” CF 136 KD 2.88”
17.75” 5.5” CF 176 KD 2.88”
B
6.75” 5.75” CF 66 KE 3.38”
10.25” 5.75” CF 102 KE 3.38”
13.75” 5.75” CF 136 KE 3.38”
17.75” 5.75” CF 176 KE 3.38”
CF2300
A
6.75” 6.5” CF 66 KG 2.94”
10.25” 6.5” CF 102 KG 2.94”
13.75” 6.5” CF 136 KG 2.94”
17.75” 6.5” CF 176 KG 2.94”
B
6.75” 8.125” CF 66 KS 3.69”
8.375” 8.125” CF 86 KS 3.69”
11.0” 8.125” CF 110 KS 3.69”
14.5” 8.125” CF 144 KS 3.69”
18.5” 8.125” CF 184 KS 3.69”
Section: Pre-Installation Checklist
Figure 2 - Dimensions: Minimum Combustion
Chamber and Air Tube Mounting.
Verify Air Tube
The information in this section may be disregarded if the
air tube is supplied by the appliance manufacturer.
On the CF1400, there are two tube arrangements
available –
- Tube A — 4.0 to 11.0 GPH per Figure 3.
- Tube B — 7.0 to 13.6 GPH per Figure 3.
○
* Install burner with
2° pitch as shown.
*2°
H
L
T
D
E
1/4” ± 1/8”