Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions page 77

Table 22 - - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued)
(TABULATED DATA BASED ON 20,200 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER,
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.
To Be Used with Modulating Furnaces 987MA60060V21 Only
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
. G A S
0.58
Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
No. Max/Min
42 3.4 /0.55
42 3.2 /0.50
43 3.6 /0.55
43 3.4 /0.55
44 3.6 /0.55
44 3.4 /0.55
44 3.2 /0.50
46 3.8 /0.60
42 3.4 /0.55
42 3.2 /0.50
43 3.6 /0.55
44 3.8 /0.60
44 3.6 /0.55
44 3.3 /0.50
45 3.8 /0.60
42 3.4 /0.55
43 3.8 /0.60
43 3.5 /0.55
44 3.8 /0.60
44 3.5 /0.55
44 3.3 /0.50
S P E C F I C I G R A V T I Y O F N A T U R
0.60 0.62
No. Max/Min No.
42 3.6 /0.55 42
42 3.3 /0.50 42
43 3.7 /0.60 42
43 3.5 /0.55 43
44 3.7 /0.60 43
44 3.5 /0.55 44
44 3.3 /0.50 44
45 3.7 /0.60 44
42 3.5 /0.55 42
42 3.3 /0.50 42
43 3.7 /0.60 43
43 3.4 /0.55 43
44 3.7 /0.60 44
44 3.4 /0.55 44
44 3.2 /0.50 44
42 3.5 /0.55 42
42 3.2 /0.50 42
43 3.6 /0.55 43
43 3.4 /0.55 43
44 3.6 /0.55 44
44 3.4 /0.55 44
77
A L G A S
0.64
Max/Min No. Max/Min
3.7 /0.60 42 3.8 /0.60
3.4 /0.55 42 3.5 /0.55
3.2 /0.50 42 3.3 /0.50
3.6 /0.55 43 3.7 /0.60
3.4 /0.55 43 3.5 /0.55
3.6 /0.55 44 3.7 /0.60
3.4 /0.55 44 3.5 /0.55
3.2 /0.50 44 3.3 /0.50
3.7 /0.55 42 3.8 /0.60
3.4 /0.55 42 3.5 /0.55
3.8 /0.60 42 3.2 /0.50
3.6 /0.55 43 3.7 /0.55
3.8 /0.60 43 3.4 /0.55
3.5 /0.55 44 3.7 /0.55
3.3 /0.50 44 3.4 /0.55
3.6 /0.55 42 3.8 /0.60
3.3 /0.55 42 3.5 /0.55
3.8 /0.60 42 3.2 /0.50
3.5 /0.55 43 3.6 /0.55
3.7 /0.60 44 3.8 /0.60
3.5 /0.55 44 3.6 /0.55
A11621B