Bryant 120 Furnace User Manual


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Table 16 – Orifice Size and Manifold Pressure for Gas Input Rate
(Tabulated Data Based on 21,000 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
0to
2000
900 42 3.2/1.5 42 3.3/1.6 42 3.4/1.6 42 3.5/1.7
925 43 3.7/1.8 43 3.8/1.8 42 3.2/1.5 42 3.3/1.6
950 43 3.5/1.7 43 3.6/1.7 43 3.7/1.8 43 3.8/1.8
975 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.7/1.7
1000 44 3.6/1.7 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7
1025 44 3.4/1.6 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6
1050 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
1075 45 3.8/1.8 44 3.2/1.5 44 3.3/1.6 44 3.4/1.6
1100 46 3.8/1.8 45 3.7/1.8 44 3.2/1.5 44 3.3/1.6
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 43 3.8/1.8 42 3.2/1.5 42 3.3/1.6 42 3.4/1.6
825 43 3.5/1.7 43 3.7/1.7 43 3.8/1.8 42 3.2/1.5
850 43 3.3/1.6 43 3.5/1.6 43 3.6/1.7 43 3.7/1.8
875 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7
900 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5 43 3.3/1.6
925 44 3.2/1.5 44 3.3/1.6 44 3.5/1.6 44 3.6/1.7
950 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6
975 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5
1000 46 3.5/1.7 46 3.6/1.7 46 3.8/1.8 45 3.7/1.8
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 43 3.5/1.7 43 3.7/1.7 43 3.8/1.8 42 3.2/1.5
800 43 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.7/1.7
825 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
850 44 3.4/1.6 44 3.5/1.7 44 3.6/1.7 43 3.2/1.5
875 45 3.8/1.8 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7
900 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5 44 3.3/1.6
925 46 3.6/1.7 46 3.7/1.8 45 3.7/1.8 45 3.8/1.8
950 46 3.4/1.6 46 3.5/1.7 46 3.7/1.7 46 3.8/1.8
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 3.3/1.6 43 3.4/1.6 43 3.5/1.7 43 3.6/1.7
775 44 3.6/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
800 44 3.3/1.6 44 3.4/1.6 44 3.6/1.7 43 3.2/1.5
825 45 3.8/1.8 44 3.2/1.5 44 3.4/1.6 44 3.5/1.6
850 46 3.8/1.8 45 3.7/1.8 45 3.8/1.8 44 3.3/1.6
875 46 3.5/1.7 46 3.7/1.7 46 3.8/1.8 45 3.7/1.8
900 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8
925 47 3.6/1.7 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7
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 44 3.5/1.7 43 3.2/1.5 43 3.3/1.6 43 3.4/1.6
750 44 3.3/1.6 44 3.4/1.6 44 3.5/1.7 43 3.2/1.5
775 45 3.7/1.8 44 3.2/1.5 44 3.3/1.6 44 3.4/1.6
800 46 3.7/1.8 46 3.8/1.8 45 3.8/1.8 44 3.2/1.5
825 46 3.5/1.7 46 3.6/1.7 46 3.7/1.8 46 3.8/1.8
850 47 3.7/1.8 47 3.8/1.8 46 3.5/1.7 46 3.6/1.7
875 47 3.5/1.7 47 3.6/1.7 47 3.7/1.8 46 3.4/1.6
900 48 3.8/1.8 47 3.4/1.6 47 3.5/1.7 47 3.7/1.7
* Orifice numbers 43 are factory installed
312A
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