High Altitude Orifice Sizing - ALLIANCE 120 Series Installation, Operation & Maintenance Manual

Gas Requirements

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