Carrier 58MCA series Installation And Operating Instructions Manual page 43

Tab{e10--Model58MCAOrificeSizeandManifoldPressurefor CorrectInput
ForUsewith 140SizeFurnacesOnly
(Tabulated DataBasedon 23,000 Btuh per Burner,Derated 2%for Each1000Ft AboveSeaLeve0*
ALTITUDE
RANGE
(FT)
0
to
2000
O%
derate
ALTITUDE
RANGE
(FT)
U.S.A.
ABtitudes
2001
t_ to
=_ aooo
L) or
Canada
<_ Altitudes
2ooi
to
4500
5%
derate
ALTITUDE
RANGE
(FT)
=>, 3001
O
4 to
D 4000
7%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUiCU FT)
850
875
9O0
925
950
979
1000
1025
I090
1079
1190
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUiCU FT)
775
809
829
859
879
990
929
990
979
1000
1025
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUICU FT)
759
779
899
829
850
879
999
929
999
979
1099
0.58
Orifice Manifold
No. Pressure
41 3.6
42 3.8
42 3.5
42 9.4
42 9.2
43 3.7
43 3.5
43 3.3
43 3.2
44 3.5
44 3.3
0.58
Orifice Manifold
No. Pressure
41 3.7
42 3.8
42 3.6
42 3.4
42 3.2
43 3.7
43 3.5
43 3.3
43 3.1
43 3.9
43 2.8
0.58
Orifice Manifold
No. Pressure
41 3.6
42 3.8
42 3.5
42 3.3
43 3.8
43 3.9
43 3.4
43 3.2
43 3.1
43 2.9
43 2.8
SPECIFIC GRAVITY OF NATURAL GAS
0.99
Orifice Manifold
No. Pressure
41 3.7
41 3.5
42 3.7
42 3.5
42 3.3
43 3.8
43 3.9
43 3.4
43 3.3
44 3.6
44 3.4
0.92 9.94 9.6$
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
41 3.8 40 3.6 40 3.8
41 3.6 41 3.7 41 3.8
42 3.8 41 3.5 41 3.6
42 3.6 42 3.7 42 3.8
42 3.4 42 3.5 42 3.6
42 3.2 42 3.3 42 3.4
43 3.7 42 3.2 42 3.3
43 3.6 43 3.7 43 3.8
43 3.4 43 3.9 43 3.9
43 3.2 43 3.3 43 3.4
44 9.5 43 3.2 43 3.3
SPECIFIC GRAVITY OF NATURAL GAS
0.99
Orifice Manifold
No. Pressure
41 3.8
41 3.6
42 3.7
42 3.5
42 3.3
43 3.8
43 3.6
43 3.4
43 3.3
43 3.t
43 2.9
0.62 9.94 9.66
Orifice Manifold Orifice Manifotd Orifice Manifotd
No. Pressure No. Pressure No. Pressure
40 3.6 40 3.7 39 3.6
41 3.7 41 3.8 40 3.6
41 3.5 41 3.6 41 3.7
42 3.6 42 3.7 41 3.5
42 3.4 42 3.5 42 3.6
42 3.2 42 3.3 42 3.4
43 3.7 42 3.2 42 3.3
43 3.9 43 3.7 43 3.8
43 3.4 43 3.9 43 3.9
43 3.2 43 3.3 43 3.4
43 3.0 43 3.t 43 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.69 0.62 9.94 9.66
Orifice Manifold Orifice Manifotd Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure
41 3.8 40 3.6 40 3.7 40 3.8
41 3.5 41 3.6 41 3.7 40 3.6
42 3.7 42 3.8 41 3.5 41 3.6
42 3.4 42 3.6 42 3.7 42 3.8
42 3.2 42 3.4 42 3.5 42 3.6
43 3.7 42 3.2 42 3.3 42 3.4
43 3.5 43 3.6 43 3.8 42 3.2
43 3.3 43 3.9 43 3.6 43 3.7
43 3.2 43 3.3 43 3.4 43 3.5
43 3.9 43 3.1 43 3.2 43 3.3
43 2.9 43 3.0 43 3.0 43 3.1
* Orifice numbers shown in BOLD are factory installed.
Percents of derate are based on midpoint of U.S. altitude ranges.
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