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Nameplate
Input,
High Stage
(Btu/hr)
Orifice No. (Qty)
40000
Manifold Press. High / Low (in.
W.C.)
Orifice No. (Qty)
60000
Manifold Press. High / Low (in.
W.C.)
Orifice No. (Qty)
90000
Manifold Press. High / Low (in.
W.C.)
Orifice No. (Qty)
115000
Manifold Press. High / Low (in.
W.C.)
Orifice No. (Qty)
127000
Manifold Press. High / Low (in.
W.C.)
Orifice No. (Qty)
130000
Manifold Press. High / Low (in.
W.C.)
Nameplate
Input
(Btu/hr)
Orifice No. (Qty)
60000
Manifold Press. (in. W.C.)
Orifice No. (Qty)
90000
Manifold Press. (in. W.C.)
Orifice No. (Qty)
115000
Manifold Press. (in. W.C.)
Orifice No. (Qty)
130000
Manifold Press. (in. W.C.)
In the U.S.A., the input rating for altitudes above 2000 ft (610m) must be reduced by 4% for each 1000 ft (305 m) above sea level.
*
In Canada, the input rating for altitudes from 2001 to 4500 ft (611 to 1372 m) above sea level must be derated by 10% by an authorized gas conversion station or
dealer.
For Canadian Installations from 2000 to 4500 ft, use U.S.A. column 2001 to 3000 ft (610 to 914 m).
† Orifices available through your distributor.
NOTE: Orifice sizes and manifold pressure settings are based on natural gas with a heating value of 1025 Btu/ft
Table 4 – Natural Gas Orifice Sizes and Manifold Pressure
208/230VAC Models
ALTITUDE OF INSTALLATION (FT. [m] ABOVE SEA LEVEL) U.S.A.*
0 to 2000
[0 to 610]
44 (2)
3.2 /1.4
44 (3)
3.2 /1.4
38 (3)
3.6 /1.6
33 (3)
3.8 /1.7
31 (3)
3.7 /1.7
31 (3)
3.8 /1.7
Table 5 – Natural Gas Orifice Sizes and Manifold Pressure
460V
ALTITUDE OF INSTALLATION (FT. ABOVE SEA LEVEL) U.S.A.*
0 to 2000
(0 ---610
m)
38 (2)
3.6
38 (3)
3.6
33 (3)
3.8
31 (3)
3.8
2001 to
3001 to
3000*
4000
[610 to
[915 to
914]
1219]
45 (2)†
48 (2)†
3.2 /1.4
3.8 /1.6
45 (3)†
48 (3)†
3.2 /1.4
3.8 /1.6
41 (3)†
41 (3)†
3.8 /1.6
3.4 /1.5
36 (3)†
36 (3)†
3.8 /1.7
3.6 /1.6
31 (3)
33 (3)†
3.2 /1.4
3.5 /1.6
31 (3)
33 (3)†
3.2 /1.4
3.7 /1.6
2001 to
3001 to
3000*
4000
(611 to 914
(915 to
m)
1219 m)
41 (2)†
41 (2)†
3.8
3.4
41 (3)†
41 (3)†
3.8
3.4
36 (3)†
36 (3)†
3.8
3.6
31 (3)
33 (3)†
3.2
3.7
3
and a specific gravity of .6.
18
4001 to
5001 to
5000
6000
[1220 to
[1524 to
1524]
1829]
48 (2)†
48 (2)†
3.5 /1.5
3.2 /1.4
48 (3)†
48 (3)†
3.5 /1.5
3.2 /1.4
42 (3)†
42 (3)†
3.4 /1.5
3.2 /1.4
36 (3)†
38 (3)†
3.3 /1.4
3.6 /1.5
33 (3)†
34 (3)†
3.2 /1.4
3.2 /1.4
33 (3)†
34 (3)†
3.4 /1.4
3.3 /1.4
4001 to
5001 to
5000
6000
(1220 to
(1524 to
1524 m)
1829 m)
42 (2)†
42 (2)†
3.4
3.2
42 (3)†
42 (3)†
3.4
3.2
36 (3)†
38 (3)†
3.3
3.6
33 (3)†
34 (3)†
3.4
3.3
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