Carrier 58MCB Installation, Start-Up, And Operating Instructions Manual page 47

Table 13—Model 58MCB Orifice Size and Manifold Pressure for Correct Input
(Tabulated Data Based on 20,000 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
775
4001 800
825
to 850
875
5000 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
700
6001 725
750
to 775
800
7000 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 040 through 120 Size Furnaces Only
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.7 43
43 3.4 43
44 3.7 44
44 3.5 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.3 45
45 3.1 45
45 3.0 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.6 43
43 3.4 43
44 3.6 44
44 3.4 44
44 3.2 44
45 3.6 45
45 3.4 45
45 3.2 45
45 3.0 45
45 2.9 45
45 2.7 45
45 2.6 45
45 2.5 45
0.58 0.60
Orifice Manifold Orifice
No. Pressure No.
42 3.2 42
43 3.6 43
44 3.8 43
44 3.6 44
44 3.3 44
45 3.8 44
45 3.5 45
45 3.3 45
45 3.1 45
45 3.0 45
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.8 42 3.2
3.5 43 3.7
3.8 43 3.4
3.6 44 3.7
3.4 44 3.5
3.8 44 3.3
3.6 45 3.7
3.4 45 3.5
3.2 45 3.3
3.1 45 3.2
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.7 42 3.2
3.5 43 3.6
3.7 43 3.4
3.5 44 3.6
3.3 44 3.4
3.7 44 3.2
3.5 45 3.6
3.3 45 3.4
3.1 45 3.3
3.0 45 3.1
2.8 45 2.9
2.7 45 2.8
2.5 45 2.6
SPECIFIC GRAVITY OF NATURAL GAS
0.62
Manifold Orifice Manifold
Pressure No. Pressure
3.3 42 3.4
3.7 43 3.8
3.4 43 3.6
3.7 44 3.8
3.4 44 3.6
3.2 44 3.3
3.7 45 3.8
3.4 45 3.6
3.2 45 3.4
3.1 45 3.2
47
(Continued)
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.3 42
43 3.8 42
43 3.5 43
44 3.8 43
44 3.6 44
44 3.4 44
44 3.2 44
45 3.6 45
45 3.4 45
45 3.3 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.3 42
43 3.7 43
43 3.5 43
44 3.7 43
44 3.5 44
44 3.3 44
45 3.8 44
45 3.6 45
45 3.4 45
45 3.2 45
45 3.0 45
45 2.9 45
45 2.7 45
0.64 0.66
Orifice Manifold Orifice
No. Pressure No.
42 3.5 42
42 3.2 42
43 3.7 43
43 3.4 43
44 3.7 44
44 3.4 44
44 3.2 44
45 3.7 45
45 3.5 45
45 3.3 45
Manifold
Pressure
3.4
3.2
3.7
3.4
3.7
3.5
3.3
3.8
3.6
3.4
Manifold
Pressure
3.4
3.8
3.6
3.4
3.6
3.4
3.2
3.7
3.5
3.3
3.1
2.9
2.8
Manifold
Pressure
3.6
3.3
3.8
3.5
3.8
3.5
3.3
3.8
3.6
3.4