Williams 2509622 Owner's Manual page 11

Installing Your Furnace
Recessed Wall Mount Installation (continued)
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 2x4
and spacer blocks as required. (Figure 6).
FIGURE 6 – Close Off Stud Space
I
CEILING PLATE OPENING
Cut away the ceiling plate between the studs where the furnace is
to be installed. Work from the top in the attic. If there is no
access to the top, remove the wall covering between the two wall
studs all the way to the ceiling. Work through this opening. Cut
out the entire plate so the plate edges will be even with the inner
face of the 2x4 studs. (Figure 7).
INSTALL VENT BASE PLATE (HOLD-DOWN PLATE)
Position base plate on top of header plate and fasten with screws.
Note: Hold down plate is not included.
HEADER PLATE (VENT SUPPORT)
Measure upward 62¼-inches from the top of the floor plate. Place
a mark on each stud at this distance. (Figure 5). Place the
header plate between the studs with the lower edges even with
marks on the studs. Make sure header plate is level.
Locate rear edge of nailing tabs at back of the header.
header plate to the 2x4 studs which will center the vent collar in
the wall. (Figure 5).
INSTALL CEILING PLATE SPACER
Nail the ceiling plate spacers either across or in between the cut
out section of ceiling plate. If nailed between, ends must be bent
at 90 degrees. They must be fastened along each long edge of
the ceiling plate hole to hold the oval vent pipe in the center of the
hole. Ceiling plate spacers preserve structural strength and
position oval vent pipe in the center of the cut out opening.
Ceiling plate spacers are not included. (Figure 7).
FIGURE 7 – Ceiling Plate Opening
Nail