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Gas Requirements
70457901ENR7
42
High Altitude Burner Orifice Sizing
For proper operation at altitudes above 2000 feet
(610 m), the gas burner orifice size must be reduced to
ensure complete combustion. Refer to
Table 6
.
For CE models, consult local gas supplier.
Table 6
Model
Gas
Altitude
Burner Orifice
New Rate
feet
meters
No.
inches
mm
Quantity
Part
Number
Btu/hr.*
Mj/hr.
050
Series
Natural Gas
2001-4000
610-1220
27
0.1440
3.7
2
M400998
119,600
126
4001-6000
1221-1830
28
0.1405
3.6
M401014
109,200
115
6001-8000
1831-2440
29
0.1360
3.4
M400997
98,800
104
8001-10,000
2441-3050
30
0.1285
3.3
M401021
88,400
93
L.P. Gas
2001-4000
610-1220
43
0.0890
2.3
M406184
119,600
126
4001-6000
1221-1830
44
0.0860
2.2
M401011
109,200
115
6001-8000
1831-2440
45
0.0820
2.1
M401027
98,800
104
8001-10,000
2441-3050
46
0.0810
2.1
M401003
88,400
93
075
Series
Natural Gas
2001-4000
610-1220
29
0.1360
3.4
3
M400997
151,800
160
4001-6000
1221-1830
30
0.1285
3.3
M401021
138,600
146
6001-8000
1831-2440
1/8
0.1250
3.2
M402489
125,400
132
8001-10,000
2441-3050
31
0.1200
3.0
M401017
112,200
118
L.P. Gas
2001-4000
610-1220
45
0.0820
2.1
M401027
165,000
174
4001-6000
1221-1830
47
0.0785
2.0
M400999
138,600
146
6001-8000
1831-2440
47
0.0785
2.0
M400999
125,400
132
8001-10,000
2441-3050
48
0.0760
1.9
M401001
112,200
118
F75
Series
Natural Gas
2001-4000
610-1220
22
0.1570
4.0
3
M402996
207,000
218
4001-6000
1221-1830
24
0.1520
3.9
M402980
189,000
199
6001-8000
1831-2440
26
0.1470
3.7
M401000
171,000
180
8001-10,000
2441-3050
28
0.1405
3.6
M401014
153,000
161
L.P. Gas
2001-4000
610-1220
41
0.0960
2.4
M401015
225,000
237
4001-6000
1221-1830
42
0.0935
2.4
M403017
189,000
199
6001-8000
1831-2440
43
0.0890
2.3
M406184
171,000
180
8001-10,000
2441-3050
44
0.0860
2.2
M401001
153,000
161
* Btu/hr. derate of 4% per 1000 feet (305 meters) of altitude.