Carrier 58MCA Installation, Start-Up, And Operating Instructions Manual page 42

Table 10—Model 58MCA Orifice Size and Manifold Pressure for Correct Input
(Tabulated Data Based on 23,000 Btuh per Burner, Derated 2% for Each 1000 Ft Above Sea Level) *
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
725
750
4001 775
800
to 825
850
5000 875
900
9% 925
derate 950
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
700
725
750
775
5001 800
825
to 850
875
6000 900
925
950
11% 975
derate 1000
AVG GAS
ALTITUDE
HEAT VALUE
RANGE
AT ALTITUDE
(FT)
(BTU/CU FT)
650
675
6001 700
725
to 750
775
7000 800
825
13% 850
derate 875
* Orifice numbers shown in BOLD are factory installed.
Percents of derate are based on midpoint of U.S. altitude ranges.
For Use with 140 Size Furnaces Only
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
41 3.6 41
42 3.7 42
42 3.5 42
42 3.3 42
43 3.7 42
43 3.5 43
43 3.3 43
43 3.1 43
43 3.0 43
43 2.8 43
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
41 3.5 41
42 3.7 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.7 43
43 2.6 43
43 2.5 43
43 2.3 43
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
41 3.8 40
41 3.5 41
42 3.6 42
42 3.4 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.8 43
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.7 41 3.8
3.8 41 3.6
3.6 42 3.7
3.4 42 3.5
3.2 42 3.3
3.6 43 3.8
3.4 43 3.6
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.7 41 3.8
3.8 41 3.5
3.5 42 3.7
3.3 42 3.4
3.8 42 3.2
3.6 43 3.7
3.4 43 3.5
3.2 43 3.3
3.0 43 3.1
2.8 43 2.9
2.7 43 2.8
2.6 43 2.6
2.4 43 2.5
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.6 40 3.7
3.6 41 3.7
3.7 41 3.5
3.5 42 3.6
3.3 42 3.4
3.7 43 3.8
3.5 43 3.6
3.3 43 3.4
3.1 43 3.2
2.9 43 3.0
42
(Continued)
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
40 3.6 40
41 3.7 41
42 3.8 41
42 3.6 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
40 3.6 40
41 3.6 41
42 3.8 41
42 3.5 42
42 3.3 42
43 3.8 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
43 2.6 43
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
40 3.8 39
40 3.6 40
41 3.6 41
42 3.7 42
42 3.5 42
42 3.3 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
Manifold
Pressure
3.8
3.8
3.6
3.7
3.5
3.3
3.8
3.6
3.4
3.2
Manifold
Pressure
3.7
3.8
3.5
3.7
3.4
3.2
3.7
3.5
3.3
3.1
3.0
2.8
2.7
Manifold
Pressure
3.7
3.7
3.7
3.8
3.6
3.4
3.8
3.6
3.4
3.2