Williams 3508232 Owner's Manual page 12

Installing Your Furnace
MODELS: 3508231; 3508232; 3508631; 3508632
Locate header plate between wall studs at 74 inches from finished
floor and nail into position with end flanges pointing up.
WARNING: Remove 4"x14" fiberglass gasket from
bottom of header plate and discard. This gasket is
not used when the furnace is recessed in the wall.
FIGURE 10
GAS SUPPLY OPENING
A hole must be drilled for the gas line supply.
Decide whether the gas line will come through the floor or wall
stud.
NOTE
If a pre-existing gas piping stub location is not compatible with
hole or knock-out provided in furnace, you may make an alternate
entry hole in the furnace back wall as shown on Page 14, Fig. 14.
CAUTION: Be careful not to damage any furnace
components while making any alternate hole.
12
Locate and drill one (1) 1-1/2 inch hole at selected locations as
shown on Page 12, Fig. 11 and Page 13, Fig. 13 or Page 14, Fig.
14.
Gas line can be run at this time or done after furnace is mounted,
see section GAS SUPPLY AND PIPING, page 18.
FIGURE 11
CLOSE OFF STUD SPACE (If Required)
If studs are not on 16 inch centers, cut the hole for the furnace
next to an existing stud and frame in the other side using a 2 x 4
and spacer blocks as required. As shown on Page 13, Fig. 12.
ELECTRICAL SUPPLY ROUGH-IN
Run the electrical supply with the ground wire and thermostat
cable into stud space next to furnace location.