High altitude compensation – Bryant 583B User Manual
Page 18
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HIGH ALTITUDE COMPENSATION
NATURAL GAS ONLY
ORIFICE CONVERSION — 3.5 in. wg MANIFOLD PRESSURE*
*As the height above sea level increases, there is less oxygen per cubic ft of air.
Therefore heat input rate should be reduced at higher altitudes.
†Orifices available through your Bryant distributor.
LIQUID PROPANE ONLY
ORIFICE CONVERSION — 3.5 in. wg MANIFOLD PRESSURE*
*As the height above sea level increases, there is less oxygen per cubic ft of air.
Therefore, heat input rate should be reduced at higher altitudes.
†Orifices available through your Bryant distributor.
ALTITUDE (ft)
INPUT
(Btuh)
OUTPUT
(Btuh)
ORIFICE
NUMBER†
0-2000
40,000
31,000
#44
60,000
46,000
#38
90,000
70,000
#38
115,000
92,000
#33
130,000
103,000
#31
2001-4500
33,290
25,800
#49
49,930
38,300
#43
74,900
58,270
#43
95,700
76,560
#38
108,180
85,680
#36
4501-6000
31,310
24,270
#50
46,970
36,030
#44
70,450
54,810
#44
90,020
71,300
#40
101,760
80,590
#37
ALTITUDE (ft)
INPUT
(Btuh)
OUTPUT
(Btuh)
ORIFICE
NUMBER†
0-2000
40,000
31,000
#50
57,000
43,720
#46
85,500
66,520
#46
115,000
92,000
#42
127,000
100,580
#41
2001-4500
33,290
25,800
#53
47,430
36,380
#50
71,150
55,350
#50
95,700
76,560
#45
105,690
83,710
#44
4501-6000
31,310
24,270
NOT TO BE USED
ABOVE 4500 FT
44,620
34,220
#51
66,930
52,070
#51
90,020
72,020
#47
99,140
78,520
#45