Carrier 59SC2A - Page 68

59SC2A
Table 21 — Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate
SINGLE-STAGE FURNACE
(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
900 43 3.8 42 3.2 42 3.3 42 3.4
© 0 925 43 3.6 43 3.7 43 3.8 42 3.2
® (0) 950 43 3.4 43 3.5 43 3.6 43 3.7
5 975 44 3.7 44 3.8 43 3.4 43 3.6
z to 1000 44 3.5 44 3.6 44 3.8 43 3.4
@ 1025 44 3.3 44 3.5 44 3.6 44 3.7
n 2000 1050 44 3.2 44 3.3 44 3.4 44 3.5
° (610) 1075 45 3.7 45 3.8 44 3.3 44 3.4
1100 46 3.7 46 3.8 45 3.8 44 3.2
U.S.A. 800 42 3.4 42 3.5 42 3.6 42 3.7
© 2001 (611) 825 43 3.8 42 3.3 42 3.4 42 3.5
® to 850 43 3.6 43 3.7 42 3.2 42 3.3
5 3000 (914) 875 43 3.4 43 3.5 43 3.7 43 3.8
z 900 44 3.7 44 3.8 43 3.5 43 3.6
@ Canada 925 44 3.5 44 3.6 44 3.8 43 3.4
n 2001 (611) 950 44 3.3 44 3.4 44 3.6 44 3.7
° to 975 44 3.2 44 3.3 44 3.4 44 3.5
4500 (1372) 1000 44 3.0 44 3.1 44 3.2 44 3.3
775 42 3.3 42 3.4 42 3.5 42 3.6
3001 800 43 3.8 42 3.2 42 3.3 42 3.4
= (915) 825 43 3.6 43 3.7 43 3.8 42 3.2
° to 850 44 3.8 43 3.5 43 3.6 43 3.7
a 875 44 3.6 44 3.7 43 3.4 43 3.5
3D 4000 900 44 3.4 44 3.5 44 3.7 44 3.8
(1219) 925 44 3.2 44 3.4 44 3.5 44 3.6
950 44 3.1 44 3.2 44 3.3 44 3.4
750 42 3.3 42 3.4 42 3.5 42 3.6
4001 775 43 3.7 43 3.8 42 3.3 42 3.4
= (1220) 800 43 3.5 43 3.6 43 3.7 43 3.8
° to 825 44 3.8 43 3.4 43 3.5 43 3.6
a 850 44 3.5 44 3.7 44 3.8 43 3.4
3D 5000 875 44 3.3 44 3.5 44 3.6 44 3.7
(1524) 900 44 3.2 44 3.3 44 3.4 44 3.5
925 44 3.0 44 3.1 44 3.2 44 3.3
725 42 3.2 42 3.3 42 3.4 42 3.5
5001 750 43 3.7 43 3.8 42 3.2 42 3.3
= (1525) 775 43 3.4 43 3.5 43 3.7 43 3.8
° to 800 44 3.7 44 3.8 43 3.4 43 3.5
a 825 44 3.5 44 3.6 44 3.7 44 3.8
3D 6000 850 44 3.3 44 3.4 44 3.5 44 3.6
(1829) 875 44 3.1 44 3.2 44 3.3 44 3.4
900 44 2.9 44 3.0 44 3.1 44 3.2
675 42 3.4 42 3.5 42 3.6 42 3.8
6001 700 42 3.2 42 3.3 42 3.4 42 3.5
= (1830) 725 43 3.6 43 3.7 43 3.8 42 3.3
° to 750 43 3.4 43 3.5 43 3.6 43 3.7
a 775 44 3.6 44 3.7 43 3.4 43 3.5
3D 7000 800 44 3.4 44 3.5 44 3.6 44 3.7
(2133) 825 44 3.2 44 3.3 44 3.4 44 3.5
850 44 3.0 44 3.1 44 3.2 44 3.3
68
A11253A