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SERVICE AND TECHNICAL SUPPORT MANUAL
Table 3 (CONT.)
Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − Modulating
(TABULATED DATA BASED ON 20,000 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER,
ALTITUDE
RANGE
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
MODULATING FURNACE
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
A
V
G
.
G
A
S
HEAT VALUE
0.58
AT ALTITUDE
Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
(Btu/cu ft)
No.
Max/Min
650
42
3.4 /0.55
675
43
3.8 /0.60
700
43
3.5 /0.55
725
44
3.8 /0.60
750
44
3.5 /0.55
775
44
3.3 /0.55
800
45
3.8 /0.60
825
46
3.7 /0.60
625
42
3.4 /0.55
650
43
3.8 /0.60
675
43
3.5 /0.55
700
44
3.7 /0.60
725
44
3.5 /0.55
750
44
3.3 /0.50
775
45
3.7 /0.60
600
42
3.3 /0.55
625
43
3.7 /0.60
650
43
3.5 /0.55
675
44
3.7 /0.60
700
44
3.4 /0.55
725
44
3.2 /0.50
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
R
0.60
0.62
No.
Max/Min
No.
Max/Min
42
3.5 /0.55
42
3.6 /0.60
42
3.2 /0.50
42
3.3 /0.55
43
3.7 /0.60
43
3.8 /0.60
43
3.4 /0.55
43
3.5 /0.55
44
3.7 /0.60
44
3.8 /0.60
44
3.4 /0.55
44
3.5 /0.55
44
3.2 /0.50
44
3.3 /0.55
46
3.8 /0.60
45
3.8 /0.60
42
3.5 /0.55
42
3.6 /0.55
42
3.2 /0.50
42
3.3 /0.55
43
3.6 /0.60
43
3.7 /0.60
43
3.4 /0.55
43
3.5 /0.55
44
3.6 /0.60
44
3.7 /0.60
44
3.4 /0.55
44
3.5 /0.55
44
3.2 /0.50
44
3.3 /0.50
42
3.4 /0.55
42
3.6 /0.55
42
3.2 /0.50
42
3.3 /0.55
43
3.6 /0.55
43
3.7 /0.60
44
3.8 /0.60
43
3.4 /0.55
44
3.5 /0.55
44
3.7 /0.60
44
3.3 /0.55
44
3.4 /0.55
Gas Furnace: (F/G)9MAC
A
L
G
A
S
0.64
No.
Max/Min
42
3.7 /0.60
42
3.4 /0.55
42
3.2 /0.50
43
3.6 /0.60
43
3.4 /0.55
44
3.7 /0.60
44
3.4 /0.55
44
3.2 /0.50
42
3.7 /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
3.4 /0.55
42
3.7 /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
440 04 4201 01
A11251B
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