Installation of Recessed Back Box
in New Construction
1. Mounting Back Box (See Figure 1).
a. Place the back box between two 16" (406mm)
center-to-center wall studs at the desired mounting
height but no closer than 8" (203mm) to adjacent wall
or floor.
b. Align back box such that the bottom and sides will be
flush with finished wall surface (top flange of back box
should protrude approximately 1/2" / 12.7mm from fin-
ished wall surface).
c. Secure the back box in position with wood screws
or nails as shown in Figure 1.
2. Power Supply Wiring (See Figure 1).
NOTE:
Wire Compartment Volume - 119in3 (1950cm3).
a. Run a power supply cable into the knockout area in
the upper right hand corner of the back box. All wiring
must be in accordance with National and local Electric
Codes. Refer to Table 1 for correct wire size.
b. Remove knockout in the top of the back box and
install a cable clamp.
c. Insert power supply cable through cable clamp, allow-
ing at least 6" (152mm) of leads to extend inside the
back box.
d. Ground the back box by connecting the supply
ground leadwire to the green ground screw located in
the inside top of the back box.
Installation of Recessed
Back box in Existing Construction
1. Provide a wall opening 14-1/2" (362mm)wide x 18-1/2"
(470mm) high at the desired mounting height, but no
closer than 8" (203mm). (See Figure 2.)
2. Power Supply Wiring
NOTE:
(Wiring Compartment Volume - 119"
3
(1950cm
3
).
a. Run a power supply cable into the area above the top
of the wall opening. All wiring must be in accordance
with National and local Electrical Codes. Refer to
Table 1 for correct wire size.
b. Install a cable clamp in the knockout in the top of
back box.
c. Insert power supply cable through cable clamp, allow-
ing at least 6" (152mm) of cable length to remain
inside the back box to facilitate connections.
d. Ground the back box by connecting the supply
ground wire to the green ground screw located in
the inside top of the back box.
3. Mounting Back Box
a. Place the back box into wall opening flush with fin-
ished wall surface on bottom and sides of box. (Top
flange of back box should protrude approximately 1/2"
(12.7mm) from finished wall surface).
b. Secure the back box in place with wood screws or nails.
WARNING
TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK:
1. DO NOT
INSTALL HEATER UPSIDE DOWN OR SIDE-
WAYS.
2. DO NOT
USE HEATER WITHOUT GRILLE.
3.
FOR WALL MOUNTING ONLY.
DO NOT
INSTALL
HEATER CLOSER THAN 8" (203 mm) TO THE FLOOR OR
ANY ADJACENT WALL SURFACE.
DO NOT
INSTALL
CLOSER THAN 36" (915 mm) TO THE CEILING.
Fig. 1: Locating Recessed Back Box in New Construction
Fig. 2: Locating Recessed Back Box in Existing Construction
GROUND
SCREW
BACK BOX
BACK BOX
CABLE
CLAMP
8” MIN.
(203mm)
8” MIN.
(203mm)
8” MIN.
(203mm)
18-1/2” MIN.
(470mm)
14-1/2” MIN.
(362mm)
NAIL OR SCREW
(2 EACH SIDE)
GROUND SCREW
CABLE CLAMP
NAIL OR SCREW
(2 EACH SIDE)
8” MIN.
(203mm)
POWER SUPPLY CABLE
POWER SUPPLY CABLE
!
MODEL #
FZL3004B
FZL4004B
TABLE 1
WATTS
3000
4000
VOLTS
240
240
AMPS
12.5
16.7
WIRE SIZE
12 AWG
10AWG
2
