International comfort products F8MVL Installation Instructions Manual page 41

Table 13 – 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.
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
FT. (M)
AT ALTITUDE
(BTUH/CU FT.)
900
925
950
975
0 to
2000
USA 1000
(0 to 610)
1025
1050
1075
1100
AVG. GAS
ALTITUDE RANGE HEAT VALUE
FT. (M)
AT ALTITUDE
(BTUH/CU FT.)
800
825
850
875
2001 to
3000 (610 900
USA
to 914)
925
950
975
1000
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
FT. (M) AT ALTITUDE
(BTUH/CU FT.)
775
800
825
3001 to
850
4000
USA
(914 to
875
1219)
900
925
950
AVG. GAS
ALTITUDE RANGE HEAT VALUE
FT. (M)
AT ALTITUDE
(BTUH/CU FT.)
750
775
800
4001 to
825
5000
USA
(1219 to
850
1524)
875
900
925
AVG. GAS
ALTITUDE RANGE HEAT VALUE
FT. (M)
AT ALTITUDE
(BTUH/CU FT.)
725
750
5001 to 775
6000 800
USA
(1524 to
825
1829)
850
875
900
* Orifice numbers 43 are factory installed
441 01 2122 01
(305 M) Above Sea Level)
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Manifold
Pressure
Orifice No.
High/Low
42 3.5/1.5
42 3.3/1.4
43 3.8/1.7
43 3.6/1.6
43 3.5/1.5
43 3.3/1.4
44 3.6/1.6
44 3.4/1.5
44 3.3/1.4
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Manifold
Pressure
Orifice No.
High/Low
42 3.4/1.5
42 3.2/1.4
43 3.7/1.6
43 3.5/1.5
43 3.3/1.4
44 3.5/1.5
44 3.4/1.5
44 3.2/1.4
45 3.7/1.6
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Manifold
Pressure
Orifice No.
High/Low
42 3.2/1.4
43 3.6/1.6
43 3.4/1.5
43 3.2/1.4
44 3.5/1.5
44 3.3/1.4
45 3.8/1.6
46 3.8/1.6
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Manifold
Pressure
Orifice No.
High/Low
43 3.6/1.6
43 3.4/1.5
43 3.2/1.4
44 3.4/1.5
44 3.2/1.4
45 3.7/1.6
46 3.7/1.6
46 3.5/1.5
SPECIFIC GRAVITY OF NATURAL GAS
0.58
Manifold
Pressure
Orifice No.
High/Low
43 3.4/1.5
43 3.2/1.4
44 3.4/1.5
44 3.2/1.4
46 3.8/1.7
46 3.6/1.6
47 3.8/1.7
47 3.6/1.6
Specifications are subject to change without notice.
0.60
Manifold
Orifice Orifice
Pressure
No. No.
High/Low
42 3.6/1.6 42
42 3.4/1.5 42
42 3.3/1.4 42
43 3.8/1.6 42
43 3.6/1.6 43
43 3.4/1.5 43
43 3.2/1.4 43
44 3.5/1.5 43
44 3.4/1.5 44
0.60
Manifold
Orifice Orifice
Pressure
No. No.
High/Low
42 3.5/1.5 42
42 3.3/1.4 42
43 3.8/1.6 42
43 3.6/1.6 43
43 3.4/1.5 43
43 3.2/1.4 43
44 3.5/1.5 44
44 3.3/1.4 44
45 3.8/1.7 44
0.60
Manifold
Orifice Orifice
Pressure
No. No.
High/Low
42 3.3/1.4 42
43 3.8/1.6 42
43 3.5/1.5 43
43 3.3/1.4 43
44 3.6/1.6 43
44 3.4/1.5 44
44 3.2/1.4 44
45 3.7/1.6 45
0.60
Manifold
Orifice Orifice
Pressure
No. No.
High/Low
43 3.8/1.6 42
43 3.5/1.5 43
43 3.3/1.4 43
44 3.6/1.5 43
44 3.4/1.5 44
45 3.8/1.7 44
46 3.8/1.7 45
46 3.6/1.6 46
0.60
Manifold
Orifice Orifice
Pressure
No. No.
High/Low
43 3.5/1.5 43
43 3.3/1.4 43
44 3.5/1.5 43
44 3.3/1.4 44
45 3.8/1.6 44
46 3.7/1.6 46
46 3.5/1.5 46
47 3.8/1.6 46
0.62 0.64
Manifold Manifold
Orifice
Pressure Pressure
No.
High/Low High/Low
3.7/1.6 41 3.5/1.5
3.5/1.5 42 3.7/1.6
3.4/1.5 42 3.5/1.5
3.2/1.4 42 3.3/1.4
3.7/1.6 43 3.8/1.7
3.5/1.5 43 3.6/1.6
3.4/1.5 43 3.5/1.5
3.2/1.4 43 3.3/1.4
3.5/1.5 43 3.2/1.4
0.62 0.64
Manifold
Manifold
Orifice
Pressure
Pressure
No.
High/Low
High/Low
3.6/1.6 42 3.7/1.6
3.4/1.5 42 3.5/1.5
3.2/1.4 42 3.3/1.4
3.7/1.6 43 3.8/1.7
3.5/1.5 43 3.6/1.6
3.3/1.4 43 3.4/1.5
3.6/1.6 43 3.2/1.4
3.4/1.5 44 3.5/1.5
3.2/1.4 44 3.4/1.5
0.62 0.64
Manifold
Manifold
Pressure Orifice
Pressure
High/Low No.
High/Low
3.4/1.5 42 3.5/1.5
3.2/1.4 42 3.3/1.4
3.7/1.6 43 3.8/1.6
3.4/1.5 43 3.6/1.5
3.3/1.4 43 3.4/1.5
3.5/1.5 43 3.2/1.4
3.3/1.5 44 3.4/1.5
3.8/1.7 44 3.3/1.4
0.62 0.64
Manifold
Manifold
Orifice
Pressure
Pressure
High/Low No.
High/Low
3.2/1.4 42 3.3/1.4
3.6/1.6 43 3.8/1.6
3.4/1.5 43 3.5/1.5
3.2/1.4 43 3.3/1.4
3.5/1.5 44 3.6/1.6
3.3/1.4 44 3.4/1.5
3.7/1.6 44 3.2/1.4
3.7/1.6 46 3.8/1.7
0.62 0.64
Manifold
Manifold
Orifice
Pressure
Pressure
High/Low No.
High/Low
3.6/1.6 43 3.7/1.6
3.4/1.5 43 3.5/1.5
3.2/1.4 43 3.3/1.4
3.4/1.5 44 3.5/1.5
3.2/1.4 44 3.3/1.4
3.8/1.7 45 3.8/1.6
3.6/1.6 46 3.7/1.6
3.4/1.5 46 3.5/1.5
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