Installation; Locating Your Wall Furnace - Williams 1403821 Owner's Manual

Installation

Locating Wall Furnace
Consider the following points before attempting to install the
furnace.
All Models
1. This is a direct-vent wall furnace. It must be installed on an
outside wall for proper venting of flue gases. (Figure 1).
2. Wall furnace must be surface mounted on an outside wall
up to 24-inches thick when using an optional Vent
Extension Kit.
3. Check the clearances needed from the furnace and vent.
(Figure 1 and 2). You must place the furnace where you will
have no less than the clearances shown.
4. The outside vent must be at least 18-inches away from any
window or other building opening.
5. The furnace will not work if anything stops free entry of
fresh air into the vent, or free flow of flue gases from it. Be
sure the center of the vent cap is at least 12-inches above
ground level or shrubs. (Figure 1). Make sure shrubs are
kept trimmed. It must also be at least 18-inches from any
wall or other blockage and 30-inches below any overhang.
6. Place the furnace near the center of the space to be heated
for good air circulation. Do not put it behind a door or
draperies. Do not put it in a closet, alcove, hallway or other
confined space where the furnace could be isolated by
closing doors to the heated space.
7. Be sure that gas piping and electrical wiring (optional
blower only) can be brought to the furnace.
8. Select a location that will provide adequate accessibility
clearance for servicing and proper operation.
Interior Clearances (Figure 2).
14038 Series:
1. There must be at least 1-3/16 inches of space between the
floor (top of floor covering) and the bottom of cabinet.
2. The top of the furnace must be at least 24-inches from the
ceiling or other projecting overhang.
3. The side of the furnace must not be closer than 2-inches to
an adjacent wall.
22038 / 30038 Series:
1. There must be at least 5-1/2 inches of space between the
floor (top of floor covering) and the bottom of cabinet.
2. The top of the furnace must be at least 30-inches from the
ceiling or other projecting overhang.
3. The side of the furnace must not be closer than 2-inches to
an adjacent wall.
6
Choose a location for the thermostat (optional) about 5-feet
above floor on an inside wall. The thermostat wire supplied
with your furnace is 20-feet long, which should be enough to
run up through the attic so the thermostat can be a maximum
of 16 feet from furnace measured in a straight line, or
approximately 12-feet from the furnace if the wire is run under
the floor. The thermostat should be sensing an average room
temperature; avoid the following:
Hot Spots Cold Spots
Concealed pipes/ducts Concealed pipes/ducts
Fireplaces Stairwells (drafts)
Registers Doors (drafts)
TV sets Unheated rooms on
Radios other side of the wall
Lamps
Direct sunlight
Kitchen
After selecting a location that meets the requirements, inspect
the wall, floor and outside areas. Make sure there are no pipes,
wiring, or anything else that would interfere with furnace, vent
or thermostat installation. If required, move or pick a new
location.
FIGURE 1
Dead Spots
Behind doors
Corners/alcoves