Bradford White TW4-75S-76B-3X - Manual (Page 23)

23
Installation (Venting (Part II)) continued-
TABLE 9
2” (5.1 cm) PVC VENT CONNECTOR LENGTHS FROM INSIDE WALL
FOR LOW GROUND CLEARANCE INSTALLATIONS
Terminating # of
Elbows
Maximum
Length Minimum
Length
(2) 90
° Elbows with Vent Terminal 0 35 ft (10.7 m) 2 ft (.6 m)
(2) 90
° Elbows with Vent Terminal 1 30 ft (9.2 m) 2 ft (.6 m)
(2) 90 ° Elbows with Vent Terminal 2 25 ft (7.6 m) 2 ft (.6 m)
(2) 90 ° Elbows with Vent Terminal 3 20 ft (6.1 m) 3 ft (.9 m)
(2) 90 ° Elbows with Vent Terminal 4 15 ft (4.6 m) 4 ft (1.2 m)
TABLE 10
3” (7.6 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR
LOW GROUND CLEARANCE INSTALLATIONS
Terminating (Reduce 3” to 2”)
(Reduce 7.6 cm to 5.1 cm)
#of
Elbows Maximum
Length Minimum
Length
(2) 90 ° Elbows with Vent Terminal 0 90 ft (27.5 m) 10 ft (3.1 m)
(2) 90 ° Elbows with Vent Terminal 1 85 ft (25.9 m) 10 ft (3.1 m)
(2) 90
° Elbows with Vent Terminal 2 80 ft (24.4 m) 10 ft (3.1 m)
(2) 90
° Elbows with Vent Terminal 3 75 ft (22.9m) 10 ft (3.1 m)
(2) 90 ° Elbows with Vent Terminal 4 70 ft (21.4 m) 10 ft (3.1 m)
(2) 90 ° Elbows with Vent Terminal 5 65 ft (19.8 m) 12 ft (3.7 m)
HIGH ALTITUDE INSTALLATIONS FOR ELEVATIONS OVER 2,000
FEET (610 m) ABOVE SEA LEVEL
The capacity of the induced draft blower declines with increasing altitude due to
a reduction in the air density. In order to assure safe and reliable performance
of the water heater, the following guidelines must be followed. Refer to the
venting tables below for maximum distances for the altitudes in your location.
TABLE 11 - HIGH ALTITUDE VENT CONNECTOR MODIFICATIONS
Altitude above sea
level
Maximum venting
length reduction from
tables 7 & 9 Maximum venting
length reduction from
tables 8 & 10
0 - 2,000 ft
(0 - 610 m) No reduction in vent
length required No reduction in vent
length required
over 2,000 - 5,000 ft
(over 610 - 1524 m) Reduce maximum vent
length by 20 ft (6.1 m) No reduction in vent
length required
over 5,000 - 8,000 ft
(over 1524 - 2439 m) Use only 3” (7.6 cm)
PVC (Tables 8 & 10) No reduction in vent
length required
over 8,000 - 10,000 ft
(over 2439 - 2540 m) Use only 3” (7.6 cm)
PVC (Tables 8 & 10) Reduce maximum vent
length by 20 ft (6.1 m)
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