Operating instructions

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)
7001
O
_ to
8000
15%
derate
ALTITUDE
RANGE
(Ft)
___ 8001
O
_ to
9000
17%
derate
ALTITUDE
RANGE
(ft)
___ 9001
O
_ to
10,000
19%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
625
650
675
700
725
750
775
800
825
850
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
600
625
650
675
700
725
750
775
800
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
575
600
625
650
675
700
725
750
775
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.80 0.82 0.84 0,68
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure
43 3.8 42 3.3 42 3.4 42 3.5 42 3.6
43 3.5 43 3.7 43 3.8 42 3.2 42 3.3
44 3.8 43 3.4 43 3.5 43 3.6 43 3.7
44 3.5 44 3.6 44 3.8 43 3.4 43 3.5
44 3.3 44 3.4 44 3.5 44 3.6 44 3.7
45 3,7 48 3,8 44 3.3 44 3.4 44 3.5
45 3.5 45 3.6 45 3.7 45 3.8 44 3.3
45 3.3 45 3.4 45 3.5 45 3.6 45 3.7
45 3.1 45 3.2 45 3.3 45 3.4 46 3.5
45 2.9 45 3.0 45 3.1 45 3.2 45 3.3
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.80 0,82 0.84 0.68
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure
43 3.8 42 3.3 42 3.4 42 3.5 42 3.6
43 3.5 43 3.6 43 3.8 42 3.2 42 3.3
44 3.7 43 3.4 43 3.5 43 3.6 43 3.7
44 3.5 44 3.6 44 3.7 44 3.8 43 3.4
44 3.2 44 3.3 44 3.4 44 3.6 44 3.7
45 3,6 45 3,8 44 3.2 44 3.3 44 3.4
45 3.4 45 3.5 45 3.6 45 3.8 44 3.2
45 3.2 45 3.3 45 3.4 45 3.5 45 3.6
45 3.0 45 3.1 45 3.2 45 3.3 45 3.4
SPECIFIC GRAVITY OF NATURAL GAS
0.98 0.80 0,82 0.84 0.88
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure
43 3.8 42 3.2 42 3.3 42 3.5 42 3.6
43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
44 3.7 44 3.8 43 3.5 43 3.6 43 3.7
44 3.4 44 3.5 44 3.7 44 3.8 43 3.4
48 3,8 44 3.3 44 3.4 44 3.5 44 3.6
45 3.6 45 3.7 45 3,8 44 3.3 44 3.4
45 3.3 45 3.4 45 3.6 45 3.7 45 3.8
45 3.1 45 3.2 45 3.3 45 3.4 45 3.5
45 2.9 45 3.0 45 3.1 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
43