Payne A Series Installation, Start-Up, Operating And Service And Maintenance Instructions page 70

Table 21 - - 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 A V G .
RANGE
HEAT VALUE
AT ALTITUDE
ft (m)
(Btu/cu ft)
650
7001 675
(2134) 700
725
to
750
8000 775
(2438) 800
825
625
8001 650
(2439) 675
700
to
725
9000 750
(2743) 775
9001 600
(2744) 625
650
to
675
10000 700
(3048) 725
* Orifice numbers shown in BOLD are factory-installed.
40,000 BTUH to 120,000 BTUH
SINGLE-STAGE FURNACE
G A S
0.58
Orifice Manifold
No. Pressure
42 3.4
43 3.8
43 3.5
44 3.8
44 3.5
44 3.3
44 3.1
44 2.9
42 3.4
43 3.8
43 3.5
44 3.7
44 3.5
44 3.3
44 3.0
42 3.3
43 3.7
43 3.5
44 3.7
44 3.4
44 3.2
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
70
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
A11253B