Surface Mount Installation - Williams 509622A Owner's Manual & Installation Instructions

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 the furnace and local codes. See Vent
Installation, page 15.
8. Set the furnace body into position. Figure 9 page 16.
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.
11. Install furnace face panel. See Front Panel Installation,
page 19. NOTE: The panel recesses ¼-inch between the
vertical edges of the enclosure.
FIGURE A
HEADER PLATE
SIDE RAIL
MONTEREY TOP VENT GAS WALL HEATER
SIDE RAIL
BASE PLATE PANEL
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