High Altitude Orifice Sizing - ALLIANCE JC50CG Manual Del Usuario

High Altitude Orifice Sizing

For proper operation at altitudes above 2000 feet
(610 meters), the gas orifice size must be reduced to
ensure complete combustion. Refer to Table 10 for
non-CE Marked models. (For CE Marked models,
consult local gas supplier.)
Model Gas
Natural Gas
50EG L.P. Gas
Natural Gas
50CG L.P. Gas
Natural Gas
75CG L.P. Gas
Natural Gas
634
L.P. Gas
* Btu/hr derate of 4% per 1000 feet (305 meters) of altitude.
70268201
Altitude
feet meters
2001-4000 610-1830
4001-6000 1831-2440
6001-10,000 2441-3050
2001-4000 610-1220
4001-6000 1221-1830
6001-8000 1831-2440
8001-10,000 2441-3050
2001-4000 610-1830
4001-6000 1831-2440
6001-10,000 2441-3050
2001-4000 610-1220
4001-6000 1221-1830
6001-8000 1831-2440
8001-10,000 2441-3050
2001-4000 610-1830
4001-6000 1831-2440
6001-10,000 2441-3050
2001-4000 610-1220
4001-6000 1221-1830
6001-8000 1831-2440
8001-10,000 2441-3050
2001-4000 610-1220
4001-6000 1221-1830
6001-8000 1831-2440
8001-10,000 2441-3050
2001-4000 610-1220
4001-6000 1221-1830
6001-8000 1831-2440
8001-10,000 2441-3050
© Published by permission of the copyright owner – DO NOT COPY or TRANSMIT
Orifice
No. inches mm Quantity Part Number
30 0.1285 3.3
31 0.1200 3.0
32 0.1160 2.9
47 0.0785 2.0
48 0.0760 1.9
49 0.0730 1.8
50 0.0700 1.8
28 0.1405 3.6
29 0.1360 3.4
30 0.1285 3.3
44 0.0860 2.2
45 0.0820 2.1
46 0.0810 2.1
47 0.0785 2.0
29 0.1360 3.4
30 0.1285 3.3
31 0.1200 3.0
45 0.0820 2.1
46 0.0810 2.1
47 0.0785 2.0
48 0.0760 1.9
23 0.1540 3.9
25 0.1495 3.8
27 0.1440 3.7
29 0.1360 3.4
42 0.0935 2.4
43 0.0890 2.3
44 0.0860 2.2
45 0.0820 2.1
Table 10
Gas Requirements
M401021
M401017
M402444
2 M400999
M401001
M401018
M401016
M401014
M400997
M401021
2 M401011
M401027
M401003
M400999
M400997
M401021
M401017
3 M401027
M401003
M400999
M401001
M401020
M402997
M400998
M400997
3
M403017
M406184
M401011
M401027
New Rate
(Btu/hr)*
87,400
72,200
64,600
87,400
79,800
72,200
64,600
110,400
100,800
91,200
110,400
100,800
91,200
81,600
151,800
138,600
125,400
151,800
138,600
125,400
112,200
197,800
180,600
163,400
146,200
197,800
180,600
163,400
146,200
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