Bryant 312A Installation, Start-Up, Operating And Service And Maintenance Instructions page 44

(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
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
(FT)
(BTUH/CU FT)
U.S.A.
0 to
and 1000
2000
Canada
1025
1050
1075
1100
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
(FT)
(BTUH/CU FT)
U.S.A.
Altitudes
2001 to
U.S.A.
3000 or
and
Canada
Canada
Altitudes
2001 to
4500
1000
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
(FT)
(BTUH/CU FT)
U.S.A. 3001 to
Only 4000
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
(FT)
(BTUH/CU FT)
U.S.A. 4001 to
Only 5000
AVG. GAS
ALTITUDE RANGE HEAT VALUE
AT ALTITUDE
(FT)
(BTUH/CU FT)
5001 to
U.S.A.
Only 6000
* Orifice numbers 43 are factory installed
Table 16 – Orifice Size and Manifold Pressure for Gas Input Rate
0.58
Orifice Manifold
No. Pressure
900 42 3.2/1.5
925 43 3.7/1.8
950 43 3.5/1.7
975 43 3.3/1.6
44 3.6/1.7
44 3.4/1.6
44 3.3/1.6
45 3.8/1.8
46 3.8/1.8
0.58
Orifice Manifold
No. Pressure
800 43 3.8/1.8
825 43 3.5/1.7
850 43 3.3/1.6
875 43 3.2/1.5
900 44 3.4/1.6
925 44 3.2/1.5
950 45 3.7/1.8
975 46 3.7/1.8
46 3.5/1.7
0.58
Orifice Manifold
No. Pressure
775 43 3.5/1.7
800 43 3.3/1.6
825 44 3.6/1.7
850 44 3.4/1.6
875 45 3.8/1.8
900 46 3.8/1.8
925 46 3.6/1.7
950 46 3.4/1.6
0.58
Orifice Manifold
No. Pressure
750 43 3.3/1.6
775 44 3.6/1.7
800 44 3.3/1.6
825 45 3.8/1.8
850 46 3.8/1.8
875 46 3.5/1.7
900 47 3.8/1.8
925 47 3.6/1.7
0.58
Orifice Manifold
No. Pressure
725 44 3.5/1.7
750 44 3.3/1.6
775 45 3.7/1.8
800 46 3.7/1.8
825 46 3.5/1.7
850 47 3.7/1.8
875 47 3.5/1.7
900 48 3.8/1.8
level)
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
42 3.3/1.6 42
43 3.8/1.8 42
43 3.6/1.7 43
43 3.4/1.6 43
43 3.3/1.6 43
44 3.6/1.7 43
44 3.4/1.6 44
44 3.2/1.5 44
45 3.7/1.8 44
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
42 3.2/1.5 42
43 3.7/1.7 43
43 3.5/1.6 43
43 3.3/1.6 43
44 3.5/1.7 43
44 3.3/1.6 44
45 3.8/1.8 44
46 3.8/1.8 45
46 3.6/1.7 46
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.7/1.7 43
43 3.4/1.6 43
43 3.2/1.5 43
44 3.5/1.7 44
44 3.3/1.6 44
45 3.8/1.8 44
46 3.7/1.8 45
46 3.5/1.7 46
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.4/1.6 43
43 3.2/1.5 43
44 3.4/1.6 44
44 3.2/1.5 44
45 3.7/1.8 45
46 3.7/1.7 46
46 3.5/1.7 46
47 3.7/1.8 47
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure No.
43 3.2/1.5 43
44 3.4/1.6 44
44 3.2/1.5 44
46 3.8/1.8 45
46 3.6/1.7 46
47 3.8/1.8 46
47 3.6/1.7 47
47 3.4/1.6 47
44
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.4/1.6 42 3.5/1.7
3.2/1.5 42 3.3/1.6
3.7/1.8 43 3.8/1.8
3.5/1.7 43 3.7/1.7
3.4/1.6 43 3.5/1.7
3.2/1.5 43 3.3/1.6
3.5/1.7 43 3.2/1.5
3.3/1.6 44 3.4/1.6
3.2/1.5 44 3.3/1.6
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.3/1.6 42 3.4/1.6
3.8/1.8 42 3.2/1.5
3.6/1.7 43 3.7/1.8
3.4/1.6 43 3.5/1.7
3.2/1.5 43 3.3/1.6
3.5/1.6 44 3.6/1.7
3.3/1.6 44 3.4/1.6
3.8/1.8 44 3.2/1.5
3.8/1.8 45 3.7/1.8
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.8/1.8 42 3.2/1.5
3.5/1.7 43 3.7/1.7
3.3/1.6 43 3.4/1.6
3.6/1.7 43 3.2/1.5
3.4/1.6 44 3.5/1.7
3.2/1.5 44 3.3/1.6
3.7/1.8 45 3.8/1.8
3.7/1.7 46 3.8/1.8
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.5/1.7 43 3.6/1.7
3.3/1.6 43 3.4/1.6
3.6/1.7 43 3.2/1.5
3.4/1.6 44 3.5/1.6
3.8/1.8 44 3.3/1.6
3.8/1.8 45 3.7/1.8
3.6/1.7 46 3.7/1.8
3.8/1.8 46 3.5/1.7
0.62 0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.3/1.6 43 3.4/1.6
3.5/1.7 43 3.2/1.5
3.3/1.6 44 3.4/1.6
3.8/1.8 44 3.2/1.5
3.7/1.8 46 3.8/1.8
3.5/1.7 46 3.6/1.7
3.7/1.8 46 3.4/1.6
3.5/1.7 47 3.7/1.7