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C38
Rev.304
Table 10 (Continued)
Gas Burner Orifice Sizing Information (See page 37, Figure 38 for side orifice detail.)
BURNER
MODEL
C2-G(O)
With
Standard
Nozzle
Mix Tube
40 11/64
C3-G(O)
With
Standard
Nozzle
Mix Tube
50 #10 Holes
C3-G(O)-25B
With ADJ
Premix Tube
50 9/32 Holes
C4-G(O)
With
Standard
Nozzle
Mix Tube
60 7/32 Holes
C5-G(O)
With
Standard
Nozzle
Mix Tube
60 7/32 Holes
C5-G(O)-30B
C6-G(O)-30
C7-G(O)-30(B)
C8-G(O)-30
(A) Limiting orifices are not generally used on natural gas for
higher ratings of On/Off, Low-High-Off, Low-High-Low units
or any ratings of modulating units as the butterfly functions
as a variable orifice. Modulating L.P . gas units require a
properly sized limiting orifice.
(B) Approximate pressure for initial start-up. Final pressure
should be determined after checking actual flow with gas
meter. Stack temperature, CO
will help in determining actual input when gas meter is not
available for this unit.
Table 11
Pilot Orifice Schedule
BURNER
MODEL
C1-G(O)
Standard 6" Fan
Optional
7x3 or 7
C2-G(O)
Standard 7x3 Fan
Standard 7
Optional
3
8
/
8
C3-G(O) Standard 8
ORIFICE
IDENTIFICATION
I.P .S.SHOULDER
MBTU
NOMINAL O.D. INCHES
INPUT
1300
2
1400
2
1500
2
1600
2
1700
2
1800
2
1900
2
2000
2
2100
2
2200
2
2300
2
2400
2
2500
2
2750
2
3000
2
3080
2
1
2750
2
/
2
1
3000
2
/
2
1
3250
2
/
2
1
3500
2
/
2
1
3750
2
/
2
1
4000
2
/
2
1
4250
2
/
2
1
4500
2
/
2
1
4718
2
/
2
1
4250
2
/
2
1
4500
2
/
2
1
4750
2
/
2
1
5000
2
/
2
1
5250
2
/
2
4000
3
4500
3
5000
3
5500
3
6000
3
6500
3
7000
3
7500
3
7840
3
5500
3
6000
3
7000
3
8000
3
9000
3
10000
3
10500
3
Require adjustable premix tubes. Gas pressure data for these burners is included with shipment.
, O
and firebox pressure
2
2
NATURAL
5
1
/
x 3
/
Fan
8
2
5
/
x 3
1
/
Fan
8
2
1
x 3
/
Fan
2
3
1
/
x 3
/
Fan
8
2
(A) LIMITING ORIFICE
INSIDE DIAMETER INCHES
NATURAL GAS
PROPANE GAS
13/16
7/8
1
1-1/16
1-1/8
1-1/4
15/16
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
1-5/16
1-27/64
1-5/8
NONE
NONE
NONE
NONE
NONE
NONE
1-5/8
1-29/32
2
NONE
NONE
1-7/16
1-9/16
2
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
NONE
DRILL SIZE
PROPANE
GAS
GAS
#36
#48
#30
#48
#36
#48
#36
#48
#36
#48
#30
#48
(B) APPROXIMATE ORIFICE PRESSURE
(INCHES W.C.) OR TEE PRESSURE
IF NO ORIFICE SIZE IS SHOWN
NATURAL GAS
17/32
3.2
35/64
3.0
9/16
3.0
37/64
3.0
19/32
3.0
39/64
3.0
5/8
3.0
41/64
3.0
21/32
3.2
43/64
3.4
11/16
3.5
45/64
3.6
23/32
3.8
3/4
4.2
25/32
4.8
51/64
5.0
3/4
3.5
25/32
3.5
13/16
3.5
27/32
3.3
7/8
3.7
29/32
4.3
15/16
4.8
31/32
5.4
1
5.8
15/16
3.5
31/32
3.3
63/64
3.4
1-1/64
3.5
1-1/32
3.7
29/32
3.2
31/32
3.4
1-1/64
3.4
1-1/16
3.5
1-1/8
4.0
13/32
5.0
1-3/16
6.0
1-7/32
6.8
1-15/64
7.4
1-1/16
1.9
1-1/8
2.5
1-3/16
3.2
1-1/4
4.5
1-3/8
6.5
1-7/16
8.0
1-1/2
8.1
Consideration should be given to magnitude of furnace
pressure. Furnace pressure must always be added to above
orifice pressures, which are based on neutral furnace
pressure.
Burners equipped with optional adjustable premix tubes will
provide flows shown at slightly lower pressures. Most fixed
premix tubes will require slightly higher pressures. When
available supply pressure is too low to provide above, orifice
may be enlarged or removed and proper adjustment made
on gas pressure regulator.
BURNER
MODEL
C3-G(O)
Optional
9x4 Fan
C4-G(O)
Standard 8
3
/
x 4
1
/
Fan
8
2
Standard 9x4 or 9x5
3
1
C5-G(O)
Standard 10
/
x 5
/
4
2
3
1
C5-G(O)-B
Standard 10
/
x 5
/
4
2
C6-G(O)
3
1
Standard 10
/
x 5
/
4
2
5
C7-G(O)
Standard 12
/
x 5 Fan
8
C8-G(O)
3
Standard 22 x 2
/
Fan
8
PROPANE GAS
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
4-5
DRILL SIZE
PROPANE
NATURAL
GAS
GAS
#30
#48
1
/
Fan
#30
#48
2
Fan
#30
#48
5
5
Fan
/
/
32
32
5
/
Fan
5
/
32
32
5
/
5
/
32
32
5
5
/
/
32
32
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