Table9--Modem 58MCA Orifice Size and Manifold Pressure for Correct input (Continued)
For Use with 040 through 120 Size Furnaces Only
(Tabulated Data Based on 20,000 Btuh per Burner, Derated 2% for Each 1000 Ft Above Sea Levem)*
ALTITUDE
RANGE
(FT)
700t
O
4 to
8000
18%
derate
ALTITUDE
RANGE
(FT)
800t
C
o
_ to
D 9000
17%
derate
ALTITUDE
RANGE
(FT)
9001
O
4 to
D t0,000
AVG GAS
HEAT VALUE
AT ALTITUDE
{BTUiCU FT)
628
650
678
708
785
758
778
800
828
850
AVG GAS
HEAT VALUE
AT ALTITUDE
{BTUiCU FT)
800
628
888
878
700
725
750
778
8OO
AVG GAS
HEAT VALUE
AT ALTITUDE
{BTUiCU FT)
878
600
628
680
678
7O0
788
780
775
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.8
44 3.5
44 3.3
45 8.7
48 3.8
48 3.3
48 3.1
48 2.9
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.7
44 3.5
44 3.2
48 8.8
45 8.4
48 3.2
48 8.0
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.7
44 3.4
48 8.8
48 3.8
48 3.3
45 3.t
48 2.9
SPECIFIC GRAVITY OF NATURAL GAS
0.80 0.82
Orifice Manifotd Orifice Manifold
No. Pressure No. Pressure
42 3.3 42 3.4
43 3.7 43 3.8
43 3.4 43 3.5
44 3.6 44 3.8
44 3.4 44 3.5
48 3.8 44 3.3
48 3.8 48 3.7
45 8.4 48 8.8
48 3.2 48 3.3
48 3.0 45 3.1
0.84 0.88
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.5 42 3.6
42 3.2 42 3.3
43 3.6 43 3.7
43 3.4 43 3.5
44 3.6 44 3.7
44 3.4 44 3.5
48 3.8 44 3.3
48 8.8 48 8.7
48 8.4 48 8.8
48 8.2 45 3.8
SPECIFIC GRAVITY OF NATURAL GAS
0.80 0.82
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.3 42 3.4
43 3.6 43 3.8
43 3.4 43 3.5
44 3.6 44 3.7
44 3.3 44 3.4
48 3.8 44 3.2
48 3.8 48 3.8
48 3.3 48 3.4
48 3.t 45 3.2
0.84 0.68
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.5 42 3.6
42 3.2 42 3.3
43 3.6 43 3.7
44 3.8 43 3.4
44 3.6 44 3.7
44 3.3 44 3.4
48 8.8 44 3.2
48 8.8 48 8.8
48 3.3 45 3.4
SPECIFIC GRAVITY OF NATURAL GAS
0.60 0.62
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.2 42 3.3
43 3.6 43 3.7
44 3.8 43 3.5
44 3.5 44 3.7
44 3.3 44 3.4
48 8.7 48 8.8
45 8.4 48 8.8
48 3.2 48 3.3
48 3.0 48 3.t
0.84 0.66
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.5 42 3.6
42 3.2 42 3.3
43 3.6 43 3.7
44 3.8 43 3.4
44 3.5 44 3.6
44 3.3 44 3.4
48 8.7 45 8.8
48 3.4 48 3.8
48 3.2 48 3.3
Orifice numbers shown in BOLD are factory installed
Percents of derate are based on midpoint of U.S. altitude ranges.
42
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