Surface-Mount Installation - Williams 3144030 Owner's Manual

Installation
NOTE
Flexible conduit may be used only if approved by your local
codes and ordinances. If you have any doubt, consult your
local Electrical or Building Inspector.
5. The electrical supply wires, ground wire and the thermostat
wires may now be routed to the heater location. See
sections "Thermostat Installation" page 10, and "Electrical
Wiring" on page 13.
6. Be sure to leave enough excess wire at the heater to make
the connections inside the heater junction box.
7. If it is more convenient for you to do so, you may pull the
wiring to the heater after it is mounted.
Close Off Stud Space (If Required)
If studs are not on 16-inch-centers, cut the hole for the heater
next to an existing stud and frame in the other side using a 2x4
and spacer blocks as required. See Figure 5.
If the distance from the top of the cutout to the ceiling wall plate
is more than 18-inches, it is recommended that it be closed off.
Nail a 2x4 long enough to go between the studs at the top of
the opening to close off the stud space.

Surface-Mount Installation

BEFORE YOU BEGIN: To avoid electrical shock turn off electrical
circuits that pass through the wall where you are going to install
the heater.
It you intend to use the optional rear outlet, turn to page 12 for
rear outlet installation procedure before you begin to install the
heater. Use only the optional grille and boot extension supplied by
the manufacturer.
Find the Studs
1. Find two studs at spot where heater is to be placed. Use a
stud locator or small finishing nails. Repeatedly drive and
remove a nail into the wall in the area of the stud until you find
it. Then find one side. Leave the nail there. Drive another nail
just on the other side of the same stud.
2. Inside edge of the other stud should be about 14½ inches
from the one found. Drive finishing nail on inside edge of this
stud.
Cut Wall Opening
If you intend to use the optional rear outlet, cut the 8¼ inch by
12½ inch opening ONLY as shown in Figure 3 on page 8. Also
see optional rear outlet installation on page 12.
FIGURE 5 – Close Off Stud Space
Electrical Supply Rough-In
1. If impractical to route the wiring to the heater from the attic,
you may make entry holes through either wall stud above the
heater and route the conduit and wiring from an adjoining stud
space, crawl space or basement.
2. To properly route the conduit, electrical power supply wires
and thermostat wires to the heater top, you must also make
entry holes in the wall board above the heater location.
3. The electrical supply openings should be located at 2-inches
above heater top to match openings shown in Figure 4 on
page 8.
4. At selected locations, drill a 1-inch hole for the electrical
supply wiring and a ½ inch hole for the thermostat wires.
5. Route the flexible conduit to the 1-inch hole in the wallboard
and allow it to extend at least 1-inch below the heater top
(71½-inches from the finished floor). See Figure 3 on page 8.
NOTE
Flexible conduit may be used only if approved by your local
codes and ordinances. If you have any doubt, consult your
local Electrical or Building Inspector.
6. The electrical supply wires, ground wire and the
thermostat wires may now be routed to the heater location.
See sections "Thermostat Installation" on page 10, and
"Electrical Wiring" on page 13.
7. Be sure to leave enough excess wire at the heater to make
the connections inside the heater junction box.
8. If it is more convenient for you to do so, you may pull the
wiring to the heater after it is mounted.
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