16
Orifice Size* and Manifold Pressure (in. w.c.) for Gas Input Rate (Continued)
(Tabulated data based on 21,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
0.60
0.62
0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
6001 to
7000
(1829 to
2134)
675
43
3.1
43
3.2
43
3.3
43
3.4
700
43
2.9
43
3.0
43
3.1
43
3.2
725
43
2.7
43
2.8
43
2.9
43
2.9
750
43
2.5
43
2.6
43
2.7
43
2.8
775
43
2.3
43
2.4
43
2.5
43
2.6
800
43
2.2
43
2.3
43
2.3
43
2.4
825
43
2.1
43
2.1
43
2.2
43
2.3
850
48
3.7
43
2.0
43
2.1
43
2.1
U.S.A.
7001 to
8000
(2134 to
2438)
650
43
2.9
43
3.0
43
3.1
43
3.2
675
43
2.7
43
2.7
43
2.8
43
2.9
700
43
2.5
43
2.6
43
2.6
43
2.7
725
43
2.3
43
2.4
43
2.5
43
2.5
750
43
2.1
43
2.2
43
2.3
43
2.4
775
43
2.0
43
2.1
43
2.2
43
2.2
800
48
3.6
48
3.7
43
2.0
43
2.1
825
48
3.3
48
3.5
48
3.6
48
3.7
U.S.A.
8001 to
9000
(2438 to
2743)
625
43
2.7
43
2.7
43
2.8
43
2.9
650
43
2.5
43
2.5
43
2.6
43
2.7
675
43
2.3
43
2.4
43
2.4
43
2.5
700
43
2.1
43
2.2
43
2.3
43
2.3
725
48
3.7
43
2.0
43
2.1
43
2.2
750
48
3.5
48
3.6
48
3.7
43
2.0
U.S.A.
9001 to
10,000
(2743 to
3048)
600
43
2.4
43
2.5
43
2.6
43
2.7
625
43
2.3
43
2.3
43
2.4
43
2.5
650
43
2.1
43
2.2
43
2.2
43
2.3
675
48
3.6
48
3.8
43
2.1
43
2.1
700
48
3.4
48
3.5
48
3.6
48
3.7
725
49
3.7
49
3.8
48
3.4
48
3.5
775
49
3.8
48
3.4
48
3.5
48
3.6
* Orifice number 43 is factory installed.
REMOVE MIXER SCREWS
Each burner contains a mixer screw that must be removed. Refer
1. Remove the mixer screws from the burners.
It is not necessary to plug the hole in the burner when the mixer
screws are removed.
Figure 20
Mixer Screw Location
Location of mixer screw
that must be removed
A11501
REINSTALL BURNER ASSEMBLY
To reinstall burner assembly:
1. Attach flame sensor to burner assembly.
2. Install HSI and bracket to burner assembly.
3. Insert one-piece burner in slot on sides of burner box and
slide burner back in place.
4. Reattach HSI wires to HSI.
5. Verify igniter to burner alignment.
6. For Silicon Nitride igniters, see
7. For Silicon Carbide igniters, see
.
8. Reattach Flame sensor wire to Flame Sensor.