Bradford White TW4-75S-76B-3N - Manual (Page 12)

12
Venting continued-
Venting System Condensation
Condensate formation does not occur in all installations of power vented water
heaters, but should be protected against on installations where condensation
can form in the venting system.
Formation of condensation in the venting system of Power Vented water
heaters is dependent upon installation conditions including, but not limited to:
ambient temperature and humidity of installation location;
ambient temperature and humidity of venting space;
vent distance and slope;
and product usage.
In order to effectively control condensate from adversely affecting the
mechanical components of the water heater several methods may be
employed:
1. For horizontal installations the vent pipe can be installed with a
downward slope (not less than 1/8 inches (3 cm)) and away from the
blower.
2. In order to prevent condensate from draining back into the blower
(vertical or horizontal runs), an optional condensate kit is available as a
service part (Condensate kit, p/n 238-45875-00). A factory supplied
exhaust adapter with drain outlet mounts directly to the blower outlet
and is secured with two hose clamps, one to the blower and the other
to the vent pipe. Tubing is provided to drain any accumulated
condensate away from the water heater and to a suitable drain. The kit
comes complete with instructions for proper installation.
This water heater is a power vented appliance and is designed to vent its
products of combustion through 3 inch (7.6 cm) or 4 inch (10.2 cm) diameter
vent pipe to the outdoors. This water heater may be either vented horizontally
through the wall or vertically through the roof. Use a 3 inch (7.6 cm) to 4 inch
(10.2 cm) reducer to connect to the vent outlet when using 4 inch (10.2 cm)
vent pipe. Apply the proper cement at the joint locations. Table 1 lists the
maximum vent lengths for this water heater using 3 inch (7.6 cm) vent pipe. If
possible, locate the water heater so that the venting length and number of
elbows are kept to the minimum distance necessary to reach the outside. If the
installation requires venting lengths that exceed the lengths listed for 3 inch
(7.6 cm) vent pipe in Table 1, then use 4 inch (10.2 cm) vent pipe for the vent
connector. Table 2 lists the venting distances allowed with 4 inch (10.2 cm)
diameter vent pipe. When venting with 4 inch (10.2 cm) vent pipe, use a 4 inch
(10.2 cm) to 3 inch (7.6 cm) reducer to exit through the building wall with 3 inch
(7.6 cm) vent pipe. Use the 3 inch (7.6 cm) vent terminal supplied with the
water heater to terminate on the outside of the building. If the length of 3 inch
(7.6 cm) vent pipe needed to go through the wall is greater than 14 inches
(35.5 cm), use 4 inch (10.2 cm) to go through the wall and reduce to 3 inch (7.6
cm) vent pipe immediately after exiting the outside wall. Refer to the venting
illustrations on the following pages. Make sure the vent pipe terminal elbow
fitting is at least 1 inch (2.5 cm) away from the edge of the wall.