Bryant 315AAV Furnace User Manual


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Table 14 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate
(Tabulated Data Based on 22,000 Btuh High--Heat/14,500 Btuh for Low--Heat per Burner, Derated 4 Percent for Each 1000 Ft.
(305 M) Above Sea Level)
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
0to
2000
(0 to 610)
900 42 3.5/1.5 42 3.6/1.6 42 3.7/1.6 41 3.5/1.5
925 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5 42 3.7/1.6
950 43 3.8/1.7 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
975 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
1000 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7
1025 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
1050 44 3.6/1.6 43 3.2/1.4 43 3.4/1.5 43 3.5/1.5
1075 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4
1100 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
2001 to
3000 (610
to 914)
800 42 3.4/1.5 42 3.5/1.5 42 3.6/1.6 42 3.7/1.6
825 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
850 43 3.7/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
875 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6 43 3.8/1.7
900 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6
925 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5
950 44 3.4/1.5 44 3.5/1.5 44 3.6/1.6 43 3.2/1.4
975 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5
1000 45 3.7/1.6 45 3.8/1.7 44 3.2/1.4 44 3.4/1.5
ALTITUDE RANGE
FT. (M)
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
3001 to
4000
(914 to
1219)
775 42 3.2/1.4 42 3.3/1.4 42 3.4/1.5 42 3.5/1.5
800 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
825 43 3.4/1.5 43 3.5/1.5 43 3.7/1.6 43 3.8/1.6
850 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.6/1.5
875 44 3.5/1.5 44 3.6/1.6 43 3.3/1.4 43 3.4/1.5
900 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4
925 45 3.8/1.6 44 3.2/1.4 44 3.3/1.5 44 3.4/1.5
950 46 3.8/1.6 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4
ALTITUDE RANGE
FT. (M)
SPECIFIC GRAVITY OF NATURAL GAS
AVG. GAS
HEAT VALUE
(BTUH/CU FT.)
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
Orifice
No.
Manifold
Pressure
High/Low
USA
4001 to
5000
(1219 to
1524)
750 43 3.6/1.6 43 3.8/1.6 42 3.2/1.4 42 3.3/1.4
775 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6 43 3.8/1.6
800 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5
825 44 3.4/1.5 44 3.6/1.5 43 3.2/1.4 43 3.3/1.4
850 44 3.2/1.4 44 3.4/1.5 44 3.5/1.5 44 3.6/1.6
875 45 3.7/1.6 45 3.8/1.7 44 3.3/1.4 44 3.4/1.5
900 46 3.7/1.6 46 3.8/1.7 45 3.7/1.6 44 3.2/1.4
925 46 3.5/1.5 46 3.6/1.6 46 3.7/1.6 46 3.8/1.7
* Orifice numbers 43 are factory installed
315AAV
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