Carrier 58MXA Installation, Start-Up, And Operating Instructions Manual page 45

Table 9--Model 58MXA 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 Level) *
ALTITUDE
RANGE
(FT)
700t
O
_ to
8000
15%
derate
ALTITUDE
RANGE
(Ft)
800t
C
o
_ to
D 9000
t7%
derate
ALTITUDE
RANGE
(ft)
900t
C
o
<.. to
D 10,000
t9%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTUiCU FT)
825
650
875
7O0
725
750
775
8O0
825
850
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
800
625
850
675
700
725
750
775
800
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
575
600
625
650
675
700
725
750
775
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.8
44 3.5
44 3.3
45 3.7
45 3.5
45 3.3
45 3.1
45 2.9
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.7
44 3.5
44 3.2
45 3.6
45 3.4
45 3.2
45 3.0
0.58
Orifice Manifold
No. Pressure
43 3.8
43 3.5
44 3.7
44 3.4
45 3.8
45 3.6
45 3.3
45 3.1
45 2.9
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold
No. Pressure
42 3.3
43 3.7
43 3.4
44 3.6
44 3.4
45 3.8
45 3.8
45 3.4
45 3.2
45 3.0
0.62 0.64 0.66
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
42 3.4 42 3.5 42 3.6
43 3.8 42 3.2 42 3.3
43 3.5 43 3.6 43 3.7
44 3.8 43 3.4 43 3.5
44 3.5 44 3.6 44 3.7
44 3.3 44 3.4 44 3.5
45 3.7 45 3.8 44 3.3
45 3.5 45 3.5 45 3.7
45 3.3 45 3.4 45 3.5
45 3.1 45 3.2 45 3.3
SPECIFIC GRAVITY OF NATURAL GAS
0.50
Orifice Manifold
No. Pressure
42 3.3
43 3.6
43 3.4
44 3.6
44 3.3
45 3.8
45 3.5
45 3.3
45 3.1
0.62 0.64 0.65
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
42 3.4 42 3.5 42 3.6
43 3.8 42 3.2 42 3.3
43 3.5 43 3.6 43 3.7
44 3.7 44 3.8 43 3.4
44 3.4 44 3.6 44 3.7
44 3.2 44 3.3 44 3.4
45 3.5 45 3.8 44 3.2
45 3.4 45 3.5 45 3.5
45 3.2 45 3.3 45 3.4
SPECIFIC GRAVITY OF NATURAL GAS
0.50
Orifice Manifold
No. Pressure
42 3.2
43 3.6
44 3.8
44 3.5
44 3.3
45 3.7
45 3.4
45 3.2
45 3.0
0.62 0.64 0.55
Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure
42 3.3 42 3.5 42 3.6
43 3.7 42 3.2 42 3.3
43 3.5 43 3.6 43 3.7
44 3.7 44 3.8 43 3.4
44 3.4 44 3.5 44 3.6
45 3.8 44 3.3 44 3.4
45 3.5 45 3.7 45 3.8
45 3.3 45 3.4 45 3.5
45 3.t 45 3.2 45 3.3
Orifice numbers 45 shown in BOLD are factory installed.
Percents of derate are based on midpoints of U.S. altitude ranges
45