International comfort products WFSR040A030 Service And Technical Support Manual page 12

Table 4 − Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate (Cont.)
(TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE
RANGE
HEAT VALUE
AT ALTITUDE
ft (m)
7001
(2134)
to
8000
(2438)
8001
(2439)
to
9000
(2743)
9001
(2744)
to
10000
(3048)
* Orifice numbers shown in BOLD are factory-installed.
12
SINGLE-STAGE FURNACE
A V G . G A S
0.58
Orifice Manifold
(Btu/cu ft) No. Pressure
650 42 3.4
675 43 3.8
700 43 3.5
725 44 3.8
750 44 3.5
775 44 3.3
800 44 3.1
825 44 2.9
625 42 3.4
650 43 3.8
675 43 3.5
700 44 3.7
725 44 3.5
750 44 3.3
775 44 3.0
600 42 3.3
625 43 3.7
650 43 3.5
675 44 3.7
700 44 3.4
725 44 3.2
Specifications subject to change without notice.
S P E C F I C I G R A V T I Y O F N A T U
0.60 0.62
Orifice Manifold Orifice
No. Pressure No.
42 3.5 42
42 3.2 42
43 3.7 43
43 3.4 43
44 3.7 44
44 3.4 44
44 3.2 44
44 3.0 44
42 3.5 42
42 3.2 42
43 3.6 43
43 3.4 43
44 3.6 44
44 3.4 44
44 3.2 44
42 3.4 42
42 3.2 42
43 3.6 43
44 3.8 43
44 3.5 44
44 3.3 44
R A L G A S
0.64
Manifold Orifice Manifold
Pressure No. Pressure
3.6 42 3.7
3.3 42 3.4
3.8 42 3.2
3.5 43 3.6
3.8 43 3.4
3.5 44 3.7
3.3 44 3.4
3.1 44 3.2
3.6 42 3.7
3.3 42 3.4
3.7 42 3.2
3.5 43 3.6
3.7 44 3.8
3.5 44 3.6
3.3 44 3.4
3.6 42 3.7
3.3 42 3.4
3.7 43 3.8
3.4 43 3.5
3.7 44 3.8
3.4 44 3.5
440 04 7101 09
A11253B