Operating instructions
o
4
o
o
4
(Q.
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 Percent for Each 1000 ft Above Sea Level)*
ALTITUDE
RANGE
(FT)
4001
to
6000
9%
derate
ALTITUDE
RANGE
(Ft)
6001
to
6000
11%
derate
ALTITUDE
RANGE
(Ft)
6001
to
7000
13%
derate
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
725
760
775
800
825
860
875
900
925
960
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
700
725
760
775
800
825
860
875
900
925
960
975
1000
Avg GAS
HEAT VALUE
AT ALTITUDE
(Btu/cu ft)
660
675
700
725
760
775
800
825
860
875
SPECIFIC GRAVITY OF NATURAL GAS
0,68 0.60 0.62
Orifice Manifold Orifice Manifold Orifice Manifold
No Pressure No Pressure No Pressure
43 37 43 38 42 32
43 34 43 35 43 37
44 37 44 38 43 34
44 35 44 36 44 37
44 32 44 34 44 35
45 3.7 45 3.8 44 3.3
45 3,5 45 3,6 46 3,7
45 3,3 45 3,4 46 3,5
45 3,1 45 3,2 46 3,3
45 3.0 45 3.1 46 3.2
0.64 0,66
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.3 42 3.4
43 3.8 42 3.2
43 3.5 43 3.7
44 3.8 43 3.4
44 3.6 44 3.7
44 3.4 44 3.5
44 3.2 44 3.3
45 3,6 45 3.8
46 3.4 46 3.6
46 3.3 46 3,4
SPECIFIC GRAVITY OF NATURAL GAS
0.68 0.60 0,62
Orifice Manifold Orifice Manifold Orifice Manifold
No Pressure No Pressure No Pressure
43 36 43 37 42 32
43 34 43 35 43 36
44 36 44 37 43 34
44 34 44 35 44 36
44 32 44 33 44 34
45 3.6 45 3.7 44 3.2
45 3,4 45 3,5 46 3,6
45 3,2 45 3,3 46 3,4
45 3,0 45 3,1 46 3,3
45 2,9 45 3,0 46 3,1
45 2,7 45 2,8 46 2,9
45 2,6 45 2,7 46 2,8
45 2.5 45 2.5 46 2.6
0.64 0.66
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.3 42 3.4
43 3.7 43 3.8
43 3.5 43 3.6
44 3.7 43 3.4
44 3.5 44 3.6
44 3.3 44 3.4
46 3.8 44 3.2
46 3.6 46 3.7
46 3.4 46 3.5
46 3,2 46 3.3
46 3,0 46 3.1
46 2.9 46 2.9
46 2.7 46 2.8
SPECIFIC GRAVITY OF NATURAL GAS
0.68 0.60 0,62
Orifice Manifold Orifice Manifold Orifice Manifold
No Pressure No Pressure No Pressure
42 32 42 33 42 34
43 36 43 37 43 38
44 38 43 34 43 36
44 36 44 37 44 38
44 33 44 34 44 36
46 3.8 44 32 44 33
45 3.5 45 3.7 46 3.8
45 3.3 45 3.4 46 3.6
45 3.1 45 3.2 46 3.4
45 3.0 45 3.1 46 3.2
0.64 0.66
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
42 3.5 42 3.6
42 3.2 42 3.3
43 3.7 43 3.8
43 3.4 43 3.5
44 3.7 44 3.8
44 3.4 44 3.5
44 3.2 44 3.3
45 3,7 48 3.8
46 3,5 46 3.6
46 3,3 46 3,4
* Orifice numbers 45 shown in BOLD are factory installed.
Percents of derate are based on midpoints of U.S. Altitude ranges.
42