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Gas Requirements
70458301ENR6
52
High Altitude Burner Orifice Sizing
For proper operation at altitudes above 2,000 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.
Model
Gas
Altitude
Burner Orifice
New Rate
feet
meters
#
inches
mm
Quantity
Part No.
(Btu/hr.)*
025
Series
Natural Gas
2,001-4,000
610-1,220
26
0.1470
3.7
1
M401000
58,880
4,001-6,000
1,221-1,830
27
0.1440
3.7
M400998
53,760
6,001-8,000
1,831-2,440
28
0.1405
3.6
M401014
48,640
8,001-10,000
2,441-3,050
29
0.1360
3.4
M400997
43,520
L.P. Gas
2,001-6,000
610-1,830
43
0.0890
2.3
M406184
58,880
6,001-8,000
1,831-2,440
44
0.0860
2.2
M401011
48,640
8,001-10,000
2,441-3,050
46
0.0810
2.1
M401003
43,520
030
Series
Natural Gas
2,001-4,000
610-1,220
22
0.1570
4.0
1
M402996
67,160
4,001-6,000
1,221-1,830
24
0.1520
3.9
M402980
61,320
6,001-8,000
1,831-2,440
26
0.1470
3.7
M401000
55,480
8,001-10,000
2,441-3,050
28
0.1405
3.6
M401014
49,640
L.P. Gas
2,001-6,000
610-1,830
42
0.0935
2.4
M403017
67,160
6,001-8,000
1,831-2,440
43
0.0890
2.3
M406184
55,480
8,001-10,000
2,441-3,050
44
0.0860
2.2
M401011
49,640
T30
Series
Natural Gas
2,001-4,000
610-1,220
22
0.1570
4.0
2
M402996
134,320
4,001-6,000
1,221-1,830
24
0.1520
3.9
M402980
122,640
6,001-8,000
1,831-2,440
26
0.1470
3.7
M401000
110,960
8,001-10,000
2441-3,050
28
0.1405
3.6
M401014
99,280
L.P. Gas
2,001-6,000
610-1,830
42
0.0935
2.4
M403017
134,320
6,001-8,000
1,831-2,440
43
0.0890
2.3
M406184
110,960
8,001-10,000
2,441-3,050
44
0.0860
2.2
M401011
99,280
035
Series
Natural Gas
2,001-4,000
610-1,220
17
0.1730
4.4
1
M411374
82,800
4,001-6,000
1,221-1,830
18
0.1695
4.3
M402988
75,600
6,001-8,000
1,831-2,440
20
0.1610
4.1
M401002
68,400
8,001-10,000
2,441-3,050
22
0.1570
4.0
M402996
61,200
L.P. Gas
2,001-4,000
610-1,220
38
0.1015
2.6
M411376
82,800
4001-6000
1,221-1,830
39
0.0995
2.5
M401007
75,600
6,001-8,000
1,831-2440
41
0.0960
2.4
M401015
68,400
8,001-10,000
2,441-3,050
42
0.0935
2.4
M403017
61,200
T45
Series
Natural Gas
2,001-4,000
610-1,220
15
0.1800
4.6
2
M411511
183,000
4,001-6,000
1,221-1,830
17
0.1730
4.4
M411374
168,400
6,001-8,000
1,831-2,440
18
0.1695
4.3
M402988
155,000
8,001-10,000
2,441-3,050
20
0.1610
4.1
M401002
142,600
L.P. Gas
2,001-4,000
610-1,220
36
0.1065
2.7
M402487
183,000
4,001-6,000
1,221-1,830
37
0.1040
2.6
M411375
168,400
6,001-8,000
1,831-2,440
38
0.1015
2.6
M411376
155,000
8,001-10,000
2,441-3,050
40
0.0980
2.5
M406361
142,600
*Btu/hr. derate of 4% per 1,000 feet (305 meters) of altitude.
Table 6 (continued)