Bryant 376CAV - Page 16

TABLE 7—MODEL 376CAV ORIFICE SIZE† AND MANIFOLD PRESSURE FOR CORRECT INPUT
(TABULATED DATA BASED ON 23,000 BTUH PER BURNER, DERATED 4 PERCENT FOR EACH 1000 FT ABOVE SEA LEVEL)*
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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. and Canada
0
to
2000
850 41 3.6 41 3.7 41 3.8 40 3.6 40 3.8
875 42 3.8 41 3.5 41 3.6 41 3.7 41 3.8
900 42 3.5 42 3.7 42 3.8 41 3.5 41 3.6
925 42 3.4 42 3.5 42 3.6 42 3.7 42 3.8
950 42 3.2 42 3.3 42 3.4 42 3.5 42 3.6
975 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
1000 43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
1025 43 3.3 43 3.4 43 3.6 43 3.7 43 3.8
1050 43 3.2 43 3.3 43 3.4 43 3.5 43 3.6
1075 44 3.5 44 3.6 43 3.2 43 3.3 43 3.4
1100 44 3.3 44 3.4 44 3.5 43 3.2 43 3.3
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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. and Canada
U.S.A.
Altitudes
2001
to
3000
or
Canada
Altitudes
2000
to
4500
775 42 3.7 42 3.8 41 3.5 41 3.6 41 3.8
800 42 3.4 42 3.6 42 3.7 42 3.8 41 3.5
825 42 3.2 42 3.3 42 3.5 42 3.6 42 3.7
850 43 3.7 43 3.8 42 3.3 42 3.4 42 3.5
875 43 3.5 43 3.6 43 3.7 42 3.2 42 3.3
900 43 3.3 43 3.4 43 3.5 43 3.7 43 3.8
925 43 3.1 43 3.2 43 3.4 43 3.5 43 3.6
950 43 3.0 43 3.1 43 3.2 43 3.3 43 3.4
975 43 2.8 43 2.9 43 3.0 43 3.1 43 3.2
1000 43 2.7 43 2.8 43 2.9 43 3.0 43 3.1
1025 43 2.6 43 2.6 43 2.7 43 2.8 43 2.9
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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
3001
to
4000
750 42 3.4 42 3.6 42 3.7 42 3.8 41 3.5
775 42 3.2 42 3.3 42 3.5 42 3.6 42 3.7
800 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
825 43 3.5 43 3.6 43 3.7 43 3.8 42 3.2
850 43 3.3 43 3.4 43 3.5 43 3.6 43 3.7
875 43 3.1 43 3.2 43 3.3 43 3.4 43 3.5
900 43 2.9 43 3.0 43 3.1 43 3.2 43 3.3
925 43 2.8 43 2.9 43 3.0 43 3.0 43 3.1
950 43 2.6 43 2.7 43 2.8 43 2.9 43 3.0
975 43 2.5 43 2.6 43 2.7 43 2.7 43 2.8
1000 43 2.4 43 2.4 43 2.5 43 2.6 43 2.7
ALTITUDE
RANGE
(FT)
AVG GAS
HEAT VALUE
(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
4001
to
5000
725 42 3.2 42 3.3 42 3.5 42 3.6 42 3.7
750 43 3.7 43 3.8 42 3.2 42 3.3 42 3.4
775 43 3.4 43 3.6 43 3.7 43 3.8 42 3.2
800 43 3.2 43 3.3 43 3.5 43 3.6 43 3.7
825 43 3.0 43 3.1 43 3.2 43 3.4 43 3.5
850 43 2.9 43 3.0 43 3.1 43 3.2 43 3.3
875 43 2.7 43 2.8 43 2.9 43 3.0 43 3.1
900 43 2.6 43 2.6 43 2.7 43 2.8 43 2.9
925 43 2.4 43 2.5 43 2.6 43 2.7 43 2.8
950 43 2.3 43 2.4 43 2.5 43 2.5 43 2.6
* For size 060135 only, input is 22,500 Btuh per burner. Deduct 0.1-in. wc from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in.
wc on altitudes up to 2000 ft, otherwise change orifice size if manifold pressure falls below 2.0-in. wc.
†Orifice sizes shown in SHADING are factory installed.
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