Williams 2509621 Installation & Operating Instruction Manual page 11

Recessed Mount Installation (Con't)
CLOSE OFF STUD SPACE
CEILING PLATE SPACERS
RECESSED MOUNT
PLA'flE
_S_NG S'PJD -_
I
[
FLOOR
•.-- 14--3/8"
I_- EXISllNG STUD
I]I
NEW STUD
III
_A_
[ I I BLOCKS
III
HI
III
14 3/8
CEILING
PLATE
SPACERS
NAILED
IN BE'nNEEN
CEILING
PLATES OR
ACROSS
FACE IF
ACCESSIBLE
CUT PLATE OPENING (RECESSED VENTING)
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 (Fig. 10).
INSTALL VENT BASE PLATE (HOLD-DOWN PLATE)
Position base plate on top of header plate and fasten with
screws. Note: These items are included in Vent Kit 9901.
HEADER PLATE (VENT SUPPORT)
Measure up 621/4 inches from the top of floor plate. Place
a mark on each stud at this distance. See Fig. 8, page 10.
Place the header plate between the studs with the lower
edges even with marks on the studs. Make sure header
plate is level.
All models: Locate rear edge of nailing tabs at back of 2x4
stud which will center the vent collar in the wall. Nail
header plate to studs. See Fig. 8, page 10.
INSTALL CEILING PLATE SPACER (RECESSED MOUNT)
Refer to Fig. 10.
Two ceiling plate spacers are in the B/W Vent Kit. They
must be fastened along each long edge of the ceiling hole
to hold the oval vent pipe in the center of the hole.
Nail the ceiling plate spacers either across or in between
the cut out section of ceiling plate. If nailed between, end
must be bent at 90 degrees.
Ceiling plate spacers preserve structural strength and posi-
tion oval vent pipe in the center of the cut out opening.
No electric power is required unless furnace is equipped
with an optional blower. Do not connect 115V service line
to the gas control valve or wall thermostat.
ELECTRICAL OUTLET (Optional)
If you are installing optional blower accessory with the fur-
nace, rough-in a 115V electrical outlet as shown in Fig. 11.
OPTIONAL ELECTRICAL OUTLET
7
BLOWER AGCT
62V4 ,
%
--11 m