Installation Guide

7
FACTS TO CONSIDER ABOUT THE LOCATION
Whether replacing an old water heater or putting the water heater
in a new location, the following critical points must be observed.
This manufactured home gas-fi red water heater is for use in a
manufactured home. You should carefully choose an indoor location
for the new water heater, because the placement is a very important
consideration for the safety of your occupants in the building and
for the most economical use of the appliance. This water heater
is for use only in a manufactured home and not intended for
outdoor installation.
This water heater has been designed and certifi ed as a direct vent
(sealed combustion) unit and no draft diverter is to be used.
Minimum clearances between the water heater and combustible
surfaces are stated on the label adjacent to the gas control
valve/thermostat. The water heater is certified for installation
on a combustible floor. Minimum vent clearances: 6” (15.2 cm).
Provide 24” (61 cm) front clearance for servicing and adequate
clearance between the jacket top and ceiling for servicing the fl ue area.
Roof jack: surface of outer pipe has a minimum clearance of 0” (0 cm).
The combustion and ventilation air fl ow must not be obstructed.
Combustion air shall not be supplied from occupied spaces. Instead,
combustion air must be supplied from outside the manufactured
home by way of the furnished air intake duct assembly. The air
intake duct assembly is 3” (7.62 cm) in diameter for 30 and 40 Gallon
models or 4” (10.2 cm) in diameter for 50 Gallon models.
A 3-1/2” (8.89 cm) diameter fl oor opening beneath the water heater
is required to accommodate the air intake duct assembly for 30
and 40 Gallon models. A 4-1/2” (11.43 cm) diameter fl oor opening
is required beneath the water heater for 50 Gallon models. The
weight of the water heater itself seals the water heater to the air
intake duct assembly.
When a manufactured home is skirted, an air intake opening with
a minimum free area of 32 square inches (206.45 cm²) must be
provided in the skirt. If the opening is covered by louvers or screen,
the total free area must be 32 square inches (206.45 cm²). Other gas
fi red appliance in the home will require additional free air openings;
consult these manufacturers for correct sizing. See Figure 3.
FIGURE 3.
If the manufactured home is installed over a basement or crawlspace,
combustion air must be supplied from outside the manufactured
LOCATING THE NEW WATER HEATER
home. The combustion air intake piping can be 3” (76 mm) PVC for
30 and 40 gallon models and 4” (102 mm) PVC for 50 Gallon models.
The air intake piping cannot exceed the lengths shown in Table 1 (page
12), including vertical and horizontal runs, or have more than 3 elbows.
All horizontal runs require adequate support at 3-1/2 foot (106.68 cm)
intervals. See Figure 4.
FIGURE 4.
The water heater should be secured to the fl oor and to the wall of the
enclosure with the mounting brackets provided. For bracket location,
refer to Securing Water Heater to Floor and Wall.
Installation of the water heater must be accomplished in such a
manner that if the tank or any connections should leak, the fl ow
will not cause damage to the structure. For this reason, it is not
advisable to install the water heater in an attic or upper fl oor. When
such locations cannot be avoided, a suitable metal drain pan should
be installed under the water heater. Metal drain pans are available at
your local hardware store. Such a drain pan must have a minimum
length and width of at least 2 inches (51 mm) greater than the water
heater dimensions and must be piped to an adequate drain. The pan
must not restrict combustion air fl ow. When a drain pan is required,
see installation instructions on page 9.
Water heater life depends upon water quality, water pressure and