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HIGH ALTITUDE INFORMATION
No gas pressure adjustment is needed when operating from 0 to 4500 ft. (0 to 8 m). See below for correct manifold pressures for altitudes
greater that 4500 ft. (1372 m) for natural and L.P. gas.
Manifold Absolute Pressure (outlet) in. w.g. (kPa)
Model No.
0 to 4500 ft. (0 to 1372 m)
above sea level
4501 to 5500 ft.
(1373 to 1676 m)
above sea level
5501 to 6500 ft.
(1677 to 1981 m)
above sea level
6501 to 7500 ft.
(1982 to 2286 m)
above sea level
G32V−75 natural no adjustment
G32V−100 natural
G32V−125 natural
3.5 (0.88) 3.4 (0.85) 3.3 (0.82) 3.2 (0.80)
G32V−75 L.P. no adjustment
G32V−100 L.P. 7.5 (0.19) 7.3 (0.185) 7.1 (0.180) 7.0 (0.177)
G32V−125 L.P. 7.5 (0.19) 7.3 (0.185) 7.1 (0.180) 7.0 (0.177)
INTAKE AND EXHAUST PIPE VENTING TABLE
Vent Pipe
Minimum Vent Pipe Diameter Required
Maximum
Equivalent Length
75,000 Btuh (22.0 kW) 100,000 Btuh (29.3 kW) 125,000 Btuh (36.6 kW)
Feet Meters in. mm in. mm in. mm
15 4.6 2 51 2 51 2 51
20 6.1 2 51 2 51 3 76
25 7.6 2 51 2 51 3 76
30 9.1 2 51 3 51 3 76
40 12.2 2 51 3 51 3 76
50 15.2 2 51 3 51 3 76
55 16.8 2 51 3 76 3 76
60 18.3 3 76 3 76 3 76
70 21.3 3 76 3 76 3 76
80 24.4 3 76 3 76 3 76
90 27.4 3 76 3 76 3 76
100 30.5 3 76 3 76 3 76
110 33.5 3 76 3 76 3 76
120 36.6 3 76 3 76 3 76
130 39.6 3 76 3 76 − − − − − − − −
MINIMUM PIPE LENGTHS FOR FURNACES G32V−75 5 feet (1.5 m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G32V−100 5 feet (1.5 m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G32V−125 5 feet (1.5 m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
VENTING NOTES One 90elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.
Two 45 elbows are equal to one 90 elbow.
One 45 elbow is equivalent to 2.5 feet (.75 m) of straight vent pipe.
One foot (305 mm) length of 2 in. (51 mm) diameter pipe is equivalent to 8 feet (2.4 m) of 3 in. (76 mm) diameter pipe.
Intake and Exhaust pipes must
be the same diameter.
2 inch x 3 inch (51 mm x 76 mm) adaptor is furnished with −100 and −125 furnaces for exhaust pipe connection.
Exhaust pipe must terminate with 1−1/2 inch (38 mm) diameter pipe for furnaces using1−1/2 (38 mm) or 2 inch (51 mm) diameter pipe runs.
Exhaust pipe must terminate with 2 inch (51 mm) diameter pipe for furnaces using 3 inch (76 mm) diameter pipe runs.