Williams 1403622 Owner's Manual page 7

Installation
FIGURE 2
MOUNTING
LEGS
To avoid electrical shock, turn off all electrical circuits that pass
through the wall where you are going to install the furnace.
This furnace must be installed using only the vent tube, air inlet
tube and vent cap assembly supplied by the manufacturer.
Before the furnace is installed, an opening must be cut through
the wall for the vent cap.
Find the Studs
Find the studs where the furnace is to be placed. Use a stud
locator or small finishing nails. Drive a nail on the inside of the
first stud. Drive a second nail on the outside of this stud.
The inside edge of the next stud should be about 14-1/2 inches
from the one found. Drive a finishing nail on the inside edge of
this stud, then another nail on the outside edge.
Using a level, draw vertical lines that will represent the two
stud center lines.
Cut Vent Opening
After locating the studs, use the cardboard template (Figure 4).
Line up the center of the stud lines on the template with the
center lines you have drawn on the wall. Use the template to
draw the 9-1/4 inch diameter circle on the wall. Then mark the
location of the gas supply line.
Using a window, door or wall corner for reference, measure to
find where the vent will be on the outside wall. Check to be
sure of the proper clearances (Figures 1 and 2). If necessary,
relocate the furnace for proper clearances.
DO NOT USE
FLUE TUBES
TO SUPPORT
WEIGHT OF
FURNACE
Drill a 1/4 inch hole in the wall at the vent opening center mark
all the way through to the outside. Cut the 9-1/4 inch diameter
hole through the inside wall. Using the 1/4 inch hole as center,
cut a matching hole in the outside wall. It may be better to work
from the outside when breaking through brick, stone or tile.
Make sure the wall openings are aligned so vent tubes and
vent will fit properly.
In new construction, frame in 9-1/4 inch x 9-1/4 inch opening
centered between the studs spaced 16 inches on centre and
the center point located as noted in Figure 3.
FIGURE 3
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Gas and Electrical Supply Openings
Holes must be drilled for the gas line (and electrical supply if
you use an optional blower kit). Drill a 1-1/2 inch hole in the
wall for the gas line where indicated on the cardboard
template. (Figure 4). You will have to determine whether the
gas line will enter the home through the outside wall or the
floor plate. These instructions can only guide you to where the
gas line will enter the furnace.
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