Orifice Size And Manifold Pressure - International comfort products N8MSN Installation Instructions Manual

FURNACE CASING WIDTH
14−1/2 (368)
17−1/2 (445)
21 (533)
24 (610)
* Recommended
** Some furnaces may have 2 filters.
(Tabulated data based on 22,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
AVG. GAS
HEAT VALUE
ALTITUDE RANGE
FT. (M) AT ALTITUDE
(BTU/CU FT.)
0 to
2000
U.S.A.
(0 to
610)
2001 to
3000
(610 to
U.S.A.
914)
3001 to
4000
U.S.A.
(914 to
1219)
4001 to
5000
U.S.A.
(1219 to
1524)
5001 to
6000
U.S.A.
(1524 to
1829)
6001 to
7000
U.S.A.
(1829 to
2134)
* Orifice numbers 43 are factory installed.
441 01 1402 02
Table 14—Filter Size Information − in.(mm)
SIDE RETURN
16 x 25 x 3/4 (406 x 635 x 19)
16 x 25 x3/4 (406 x 635 x 19)
16 x 25 x3/4 (406 x 635 x 19)
16 x 25 x3/4 (406 x 635 x 19)
Table 15—Orifice Size* and Manifold Pressure in. w.c. for Gas Input Rate
0.58
Orifice Manifold
No. Pressure
900 42 3.5
925 42 3.3
950 43 3.8
975 43 3.6
1000 43 3.5
1025 43 3.3
1050 44 3.6
1075 44 3.4
1100 44 3.3
800 42 3.4
825 42 3.2
850 43 3.7
875 43 3.5
900 43 3.3
925 43 3.1
950 43 2.9
975 43 2.8
1000 43 2.6
775 42 3.2
800 43 3.6
825 43 3.4
850 43 3.2
875 43 3.0
900 43 2.9
925 43 2.7
950 43 2.6
750 43 3.6
775 43 3.4
800 43 3.2
825 43 3.0
850 43 2.8
875 43 2.7
900 43 2.5
925 43 2.4
725 43 3.4
750 43 3.2
775 43 3.0
800 43 2.8
825 43 2.6
850 43 2.5
875 43 2.3
900 43 2.2
675 43 3.4
700 43 3.1
725 43 2.9
750 43 2.7
775 43 2.6
800 43 2.4
825 43 2.3
850 43 2.1
FILTER SIZE
BOTTOM RETURN
14 x 25 x 3/4 (356 x 635 x 19)
16 x 25 x 3/4 (406 x 635 x 19)
20 x 25 x 3/4 (508 x 635 x 19)
24 x 25 x 3/4 (610 x 635 x 19)
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice Manifold Orifice
No. Pressure
42 3.6
42 3.4
42 3.3
43 3.8
43 3.6
43 3.4
43 3.2
44 3.5
44 3.4
42 3.5
42 3.3
43 3.8
43 3.6
43 3.4
43 3.2
43 3.0
43 2.9
43 2.7
42 3.3
43 3.8
43 3.5
43 3.3
43 3.1
43 3.0
43 2.8
43 2.7
43 3.8
43 3.5
43 3.3
43 3.1
43 2.9
43 2.8
43 2.6
43 2.5
43 3.5
43 3.3
43 3.1
43 2.9
43 2.7
43 2.5
43 2.4
43 2.3
43 3.5
43 3.3
43 3.0
43 2.8
43 2.7
43 2.5
43 2.3
43 2.2
FILTER TYPE
Washable*
Washable*
Washable*
Washable*
0.62
Manifold Orifice
No. Pressure No.
42 3.7 41
42 3.5 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.4 43
43 3.2 43
44 3.5 43
42 3.6 42
42 3.4 42
42 3.2 42
43 3.7 43
43 3.5 43
43 3.3 43
43 3.1 43
43 3.0 43
43 2.8 43
42 3.4 42
42 3.2 42
43 3.7 43
43 3.4 43
43 3.3 43
43 3.1 43
43 2.9 43
43 2.8 43
42 3.2 42
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.9 43
43 2.7 43
43 2.6 43
43 3.6 43
43 3.4 43
43 3.2 43
43 3.0 43
43 2.8 43
43 2.6 43
43 2.5 43
43 2.3 43
43 3.6 43
43 3.4 43
43 3.1 43
43 2.9 43
43 2.7 43
43 2.6 43
43 2.4 43
43 2.3 43
0.64
Manifold
Pressure
3.5
3.7
3.5
3.3
3.8
3.6
3.5
3.3
3.2
3.7
3.5
3.3
3.8
3.6
3.4
3.2
3.1
2.9
3.5
3.3
3.8
3.6
3.4
3.2
3.0
2.8
3.3
3.8
3.5
3.3
3.1
2.9
2.8
2.6
3.7
3.5
3.3
3.1
2.9
2.7
2.6
2.4
3.7
3.5
3.2
3.0
2.8
2.7
2.5
2.4
35