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TABLE 9—MODEL 340MAV 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)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
725 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
750 43 3.4 43 3.5 43 3.7 43 3.8 42 3.2
4001 775 44 3.7 44 3.8 43 3.4 43 3.5 43 3.7
800 44 3.5 44 3.6 44 3.7 44 3.8 43 3.4
to 825 44 3.2 44 3.4 44 3.5 44 3.6 44 3.7
850 45 3.7 45 3.8 44 3.3 44 3.4 44 3.5
5000 875 45 3.5 45 3.6 45 3.7 44 3.2 44 3.3
900 45 3.3 45 3.4 45 3.5 45 3.6 45 3.8
0% 925 45 3.1 45 3.2 45 3.3 45 3.4 45 3.6
derate 950 45 3.0 45 3.1 45 3.2 45 3.3 45 3.4
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
700 43 3.6 43 3.7 42 3.2 42 3.3 42 3.4
725 43 3.4 43 3.5 43 3.6 43 3.7 43 3.8
750 44 3.6 44 3.7 43 3.4 43 3.5 43 3.6
775 44 3.4 44 3.5 44 3.6 44 3.7 43 3.4
5001 800 44 3.2 44 3.3 44 3.4 44 3.5 44 3.6
825 45 3.6 45 3.7 44 3.2 44 3.3 44 3.4
to 850 45 3.4 45 3.5 45 3.6 45 3.8 44 3.2
875 45 3.2 45 3.3 45 3.4 45 3.6 45 3.7
6000 900 45 3.0 45 3.1 45 3.3 45 3.4 45 3.5
925 45 2.9 45 3.0 45 3.1 45 3.2 45 3.3
950 45 2.7 45 2.8 45 2.9 45 3.0 45 3.1
11% 975 45 2.6 45 2.7 45 2.8 45 2.9 45 2.9
derate 1000 45 2.5 45 2.5 45 2.6 45 2.7 45 2.8
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
AT ALTITUDE
(BTU/CU FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64 0.66
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A. Only
650 42 3.2 42 3.3 42 3.4 42 3.5 42 3.6
675 43 3.6 43 3.7 43 3.8 42 3.2 42 3.3
6001 700 44 3.8 43 3.4 43 3.6 43 3.7 43 3.8
725 44 3.6 44 3.7 44 3.8 43 3.4 43 3.5
to 750 44 3.3 44 3.4 44 3.6 44 3.7 44 3.8
775 45 3.8 44 3.2 44 3.3 44 3.4 44 3.5
7000 800 45 3.5 45 3.7 45 3.8 44 3.2 44 3.3
825 45 3.3 45 3.4 45 3.6 45 3.7 45 3.8
13% 850 45 3.1 45 3.2 45 3.4 45 3.5 45 3.6
derate 875 45 3.0 45 3.1 45 3.2 45 3.3 45 3.4
*Orifice numbers shown in BOLD are factory installed.
Percents of derate are based on midpoints of U.S. altitude ranges.
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