20
21
STEP 2 - CHANGE BURNER ORIFICES
IMPORTANT:
Carefully read and observe each orifice label for correct location.
See the Burner Chart in this section.
1
Burner and Orifice Characteristic Table (ADA)
2
3
4
1
2
3
4
Triple Ring
Rapid
Semi-Rapid
Auxiliary
NG
LP (Propane)
NG
LP (Propane)
NG
LP (Propane)
NG
LP (Propane)
2.1
1.26
1.45
0.91
1.29
0.8
1.1
0.7
4"
10"
4"
10"
4"
10"
4"
10"
18000 BTU
18000 BTU
8500 BTU
8500 BTU
6800 BTU
6800 BTU
5000 BTU
5000 BTU
Burner
Gas Type
Orifice
Diam. (mm)
Pressure
[i.w.c.]
Rate
[BTU/h]
NOTE:
First remove all orifices and then start replacing them. This will help
avoid the possibility that some may not be replaced.
1.
Remove the burner grates, burner caps and burner heads.
2.
Using a 7 mm nut driver, remove the burner orifices.
Triple Ring Burner
Auxiliary Burner
Semi-Rapid Burner
Rapid Burner
3.
Install the proper orifices in the exact locations as noted in the previous
graphic.
4.
Replace the burner bases, heads, caps and top grates. Make sure burner
caps are properly seated on the burner head.
Properly Seated
Not Properly Seated
Orifice
091
Orifice Size
(091 - Denotes 0.91mm)
1
4
3
3
24" Model: COS-640STX-E
30" Model: COS-850SLTX-E
