Carrier 59SC2A - Page 69

SINGLE-STAGE FURNACE
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 AVG. GAS SPECIFIC GRAVITY OF NATURAL GAS
RANGE HEAT VALUE 0.58 0.60 0.62 0.64
AT ALTITUDE | Orifice | Manifold Orifice | Manifold Orifice | Manifold Orifice | Manifold
ft (m) (Btu/cu ft) No. Pressure No. Pressure No. Pressure No. Pressure
650 42 3.4 42 3.5 42 3.6 42 3.7
7001 675 43 3.8 42 3.2 42 3.3 42 3.4
= (2134) 700 43 3.5 43 3.7 43 3.8 42 3.2
o to 725 44 3.8 43 3.4 43 3.5 43 3.6
x 750 44 3.5 44 3.7 44 3.8 43 3.4
3 8000 775 44 3.3 44 3.4 44 3.5 44 3.7
(2438) 800 44 3.1 44 3.2 44 3.3 44 3.4
825 44 2.9 44 3.0 44 3.1 44 3.2
625 42 3.4 42 3.5 42 3.6 42 3.7
os 8001 650 43 3.8 42 3.2 42 3.3 42 3.4
5 (2439) 675 43 3.5 43 3.6 43 3.7 42 3.2
< to 700 44 3.7 43 3.4 43 3.5 43 3.6
2 725 44 3.5 44 3.6 44 3.7 44 3.8
9000 750 44 3.3 44 3.4 44 3.5 44 3.6
(2743) 775 44 3.0 44 3.2 44 3.3 44 3.4
9001 600 42 3.3 42 3.4 42 3.6 42 3.7
= (2744) 625 43 3.7 42 3.2 42 3.3 42 3.4
o to 650 43 3.5 43 3.6 43 3.7 43 3.8
x 675 44 3.7 44 3.8 43 3.4 43 3.5
3 10000 700 44 3.4 44 3.5 44 3.7 44 3.8
(3048) 725 44 3.2 44 3.3 44 3.4 44 3.5
* Orifice numbers shown in BOLD are factory-installed.
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A11253B
59SC2A