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Gas Requirements
70458101 (EN)
40
High Altitude Orifice Sizing
For proper operation at altitudes above 610 meters
(2000 feet), the gas orifice size must be reduced to
ensure complete combustion. Refer to
Table 8
.
For CE models, consult local gas supplier.
Model
Gas
Altitude
Orifice
New Rate
m
feet
No.
mm
inches
Quantity
Part No.
(Btu/hr.)*
120L/N
Natural
Gas
610 – 1220
2001 – 4000
16
4.5
0.1770
3
M402988
248,400
1221 – 1830
4001 – 6000
18
4.3
0.1695
M402995
226,800
1831 – 2440
6001 – 8000
19
4.2
0.1660
M401002
205,200
2441 – 3050
8001 – 10,000
20
4.1
0.1610
M401020
183,600
L.P.
Gas
610 – 1220
2001 – 4000
38
2.6
0.1015
M411376
248,400
1221 – 1830
4001 – 6000
39
2.5
0.0995
M401007
226,800
1831 – 2440
6001 – 8000
41
2.4
0.0960
M401015
205,200
2441 – 3050
8001 – 10,000
42
2.4
0.0935
M403017
183,600
170L/N
Natural
Gas
610 – 1220
2001 – 4000
14
4.6
0.1820
4
M411371
363,400
1221 – 1830
4001 – 6000
16
4.5
0.1770
M411373
331,800
1831 – 2440
6001 – 8000
17
4.4
0.1730
M411374
300,200
2441 – 3050
8001 – 10,000
19
4.2
0.1660
M402995
268,600
L.P.
Gas
610 – 1830
2001 – 6000
30
3.3
0.1285
3
M401021
363,400
1831 – 3050
6001 – 10,000
31
3.0
0.1200
M401017
300,200
200L/N
Natural
Gas
610 – 1220
2001 – 4000
19
4.2
0.1660
5
M402995
391,000
1221 – 1830
4001 – 6000
20
4.1
0.1610
M401002
357,000
1831 – 2440
6001 – 8000
22
4.0
0.1570
M402996
323,000
2441 – 3050
8001 – 10,000
24
3.9
0.1520
M402980
289,000
L.P.
Gas
610 – 1220
2001 – 4000
33
2.9
0.1130
4
M401022
391,000
1221 – 1830
4001 – 6000
34
2.8
0.1110
M411512
357,000
1831 – 2440
6001 – 8000
7/64
2.8
0.1094
70070902
323,000
2441 – 3050
8001 – 10,000
37
2.6
0.1040
M401024
289,000
* Btu/hr. derate of 4% per 305 m (1000 ft.) of altitude.
Table 8