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→ TABLE 8—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
775 44 3.7 44 3.8 43 3.4 43 3.5 43 3.7
4001 800 44 3.5 44 3.6 44 3.7 44 3.8 43 3.4
825 44 3.2 44 3.4 44 3.5 44 3.6 44 3.7
to 850 45 3.7 45 3.8 44 3.3 44 3.4 44 3.5
875 45 3.5 45 3.6 45 3.7 44 3.2 44 3.3
5000 900 45 3.3 45 3.4 45 3.5 45 3.6 45 3.8
925 45 3.1 45 3.2 45 3.3 45 3.4 45 3.6
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
975 45 2.6 45 2.7 45 2.8 45 2.9 45 2.9
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
700 44 3.8 43 3.4 43 3.6 43 3.7 43 3.8
6001 725 44 3.6 44 3.7 44 3.8 43 3.4 43 3.5
750 44 3.3 44 3.4 44 3.6 44 3.7 44 3.8
to 775 45 3.8 44 3.2 44 3.3 44 3.4 44 3.5
800 45 3.5 45 3.7 45 3.8 44 3.2 44 3.3
7000 825 45 3.3 45 3.4 45 3.6 45 3.7 45 3.8
850 45 3.1 45 3.2 45 3.4 45 3.5 45 3.6
875 45 3.0 45 3.1 45 3.2 45 3.3 45 3.4
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