Bryant 120 Furnace User Manual


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Table 15 – Orifice Size and Manifold Pressure for Gas Input Rate
(Tabulated Data Based on 22,000 Btuh High--Heat/14,500 Btuh for Low--Heat per Burner, Derated 4% for Each 1000 Ft Above Sea
Level)
ALTITUDE RANGE
(FT)
AVG. GAS
HEAT VALUE
(BTUH/CU
FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
and
Canada
0 to 2000
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)
AVG. GAS
HEAT VALUE
(BTUH/CU
FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
and
Canada
U.S.A.
Altitudes
2001 to
3000 or
Canada
Altitudes
2001 to
4500
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)
AVG. GAS
HEAT VALUE
(BTUH/CU
FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
3001 to
4000
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)
AVG. GAS
HEAT VALUE
(BTUH/CU
FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
4001 to
5000
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
ALTITUDE RANGE
(FT)
AVG. GAS
HEAT VALUE
AT ALTITUDE
(BTUH/CU
FT)
SPECIFIC GRAVITY OF NATURAL GAS
0.58 0.60 0.62 0.64
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
U.S.A.
Only
5001 to
6000
725 43 3.4/1.5 43 3.5/1.5 43 3.6/1.6 43 3.7/1.6
750 43 3.2/1.4 43 3.3/1.4 43 3.4/1.5 43 3.5/1.5
775 44 3.4/1.5 44 3.5/1.5 43 3.2/1.4 43 3.3/1.4
800 44 3.2/1.4 44 3.3/1.4 44 3.4/1.5 44 3.5/1.5
825 46 3.8/1.7 45 3.8/1.6 44 3.2/1.4 44 3.3/1.4
850 46 3.6/1.6 46 3.7/1.6 46 3.8/1.7 45 3.8/1.6
875 47 3.8/1.7 46 3.5/1.5 46 3.6/1.6 46 3.7/1.6
900 47 3.6/1.6 47 3.8/1.6 46 3.4/1.5 46 3.5/1.5
* Orifice numbers 43 are factory installed
312A
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