SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MAC
Specifications subject to change without notice.
16 440 04 4201 03
Table 5 (Cont.)
Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate
TO BE USED WITH MODULATING FURNACES (F/G)9MAC0602120 FURNACE ONLY
AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS
HEAT VALUE 0.58 0.60 0.62 0.64
AT ALTITUDE Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press
(Btu/cu ft) No. Max/Min No. Max/Min No. Max/Min No. Max/Min
ft (m)
(TABULATED DATA BASED ON 20,200 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER,
DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE
RANGE
650 42 3.4 /0.55 42 3.6 /0.55 42 3.7 /0.60 42 3.8 /0.60
7001 675 42 3.2 /0.50 42 3.3 /0.50 42 3.4 /0.55 42 3.5 /0.55
(2134) 700 43 3.6 /0.55 43 3.7 /0.60 42 3.2 /0.50 42 3.3 /0.50
725 43 3.4 /0.55 43 3.5 /0.55 43 3.6 /0.55 43 3.7 /0.60
750 44 3.6 /0.55 44 3.7 /0.60 43 3.4 /0.55 43 3.5 /0.55
8000 775 44 3.4 /0.55 44 3.5 /0.55 44 3.6 /0.55 44 3.7 /0.60
(2438) 800 44 3.2 /0.50 44 3.3 /0.50 44 3.4 /0.55 44 3.5 /0.55
825 46 3.8 /0.60 45 3.7 /0.60 44 3.2 /0.50 44 3.3 /0.50
625 42 3.4 /0.55 42 3.5 /0.55 42 3.7 /0.55 42 3.8 /0.60
8001 650 42 3.2 /0.50 42 3.3 /0.50 42 3.4 /0.55 42 3.5 /0.55
(2439) 675 43 3.6 /0.55 43 3.7 /0.60 43 3.8 /0.60 42 3.2 /0.50
700 44 3.8 /0.60 43 3.4 /0.55 43 3.6 /0.55 43 3.7 /0.55
725 44 3.6 /0.55 44 3.7 /0.60 44 3.8 /0.60 43 3.4 /0.55
9000 750 44 3.3 /0.50 44 3.4 /0.55 44 3.5 /0.55 44 3.7 /0.55
(2743) 775 45 3.8 /0.60 44 3.2 /0.50 44 3.3 /0.50 44 3.4 /0.55
9001 600 42 3.4 /0.55 42 3.5 /0.55 42 3.6 /0.55 42 3.8 /0.60
(2744) 625 43 3.8 /0.60 42 3.2 /0.50 42 3.3 /0.55 42 3.5 /0.55
650 43 3.5 /0.55 43 3.6 /0.55 43 3.8 /0.60 42 3.2 /0.50
675 44 3.8 /0.60 43 3.4 /0.55 43 3.5 /0.55 43 3.6 /0.55
10000 700 44 3.5 /0.55 44 3.6 /0.55 44 3.7 /0.60 44 3.8 /0.60
(3048) 725 44 3.3 /0.50 44 3.4 /0.55 44 3.5 /0.55 44 3.6 /0.55
* Orifice numbers shown in BOLD are factory-installed.
U.S.A. Only
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U.S.A. Only
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U.S.A. Only
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L11F100B
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