Surface Mount Installation - Williams AC2030 Owner's Manual

INSTALLING
YOUR FURNACE

Surface Mount Installation

The use of the optional Free Standing Accessory No. 4901
allows single-sided furnaces to be surface mounted instead
of recessed into a wall. This is ideal for remodeling existing
masonry wall construction or when studding is substandard.
This kit drastically cuts installation time and eliminates the
expense of cutting into the walls and ceiling plates. Be sure
this accessory is of the type and design required for the use
with your furnace.
NOTE: After picking a location that meets the requirements,
check the wall, attic, and roof to make sure there are no
obstructions such as pipes, electrical wiring, etc., which could
interfere with the installation of the furnace or vent pipe. If
required, move them or pick a new location.
Find the wall studs or ceiling joists
Find two studs or joists at the spot where the furnace is to be
located. Use a stud locater or small finishing nails. Repeatedly
drive and remove a nail into the wall or ceiling in the area of
the stud or joust until you find it. Then find the its side and
leave the nail there. Drive another nail just on the other side
other the same stud or joist.
The inside of the next stud or joist should be about 14½ inches
from the first one found. Drive a nail on the inside of this stud
or joist.
Using the nails as a guide, draw two lines down the side of
the wall from the ceiling to locate the furnace and ceiling
hole cutout for venting.
Free standing accessory assembly & installation
1. Attach the base plate panel as shown in Figure A to the
bottom of the side rails with four (4) # 6, ⅜" screws.
2. Attach the header plate, (included with the furnace), to
the side rails using four (4) #8, ⅜" screws. Flanges of the
header plate go against the wall. (Figure A).
3. Install extension side rails as shown in Figure A, by
telescoping them inside the lower side rails. Adjust the
extension side rails by sliding them up or down to ceiling
height. Maximum: 8 feet 9 inches, Minimum: 7 feet 9
inches.
4. If the wall has a baseboard, cut the baseboard out to fit
against the side rails. Stand the side rails against the wall
and fasten them to the wall securely with screws or bolts
in the holes provided. Use a level to assure the enclosure
is plumb. Screws and bolts for wall fastening are not
included.
5. After positioning the enclosure, cut a 3½ X 14 inch hole in
the ceiling, centered between the studs or joists as
shown in Figure B.
6. Cut ¼ inch off each end of the ceiling spacer plate. Place
the ceiling spacer plate to the back of the wall and
centered in the enclosure as shown in Figure C.
7. Install Type B/W vent though the roof and studs or joists in
accordance with the installation instructions packed with
12
the furnace and local codes. See Vent Installation,
page 14.
8. Set the furnace body into position. (Figure 9), page 15. The
furnace legs will rest on the bottom of the base plate panel.
Utilizing the holes provided in the furnace legs, secure the
furnace to the brackets attached to the bottom panel with
two (2) #10, ¾" screws.
9. Install the vent enclosure panel, fastening it to the side rails
with six (6) #6, ⅜" screws. Trim the bottom of the panel to
fit the header plate.
10. Install gas inlet through the back wall or one of the two
holes provided in the bottom base plate panel. (Figure D.)
Connect gas line to furnace. See Gas supply and Piping,
page 17.
Install furnace face panel. See Front Panel Installation,
11.
page 18. NOTE: The panel recesses ¼-inch between the
vertical edges of the enclosure.
FIGURE A
HEADER PLATE
SIDE RAIL SIDE RAIL
BASE PLATE PANEL