Installation of Recessed Back Box
in New Construction
1. Mounting Back Box (See Figure 1).
a. Place the back box between two 16" (406 mm) center-to-
center wall studs at the desired mounting height but no closer
than 8" (203 mm) to adjacent wall of floor.
b. Align back box such that the bottom and sides will be flush with
finished wall surface (top flange of wall box should protrude
approximately 1/2" (12.7 mm) from finished 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 Electrical Codes. Refer to
Table 1 for correct wire size.
b. Remove disconnect switch bracket by loosening two screws on
the right side.
c. Install a cable clamp in the “knockout” in the top of the back box.
d. Insert power supply cable through cable clamp, allowing at least
6" (152mm) of leads to extend inside the back box. Connect the
blue lead wires of disconnect switch to the supply wire leads
using wire connectors wiring diagram, pg. 3).
e. Ground the back box using the green screw located in the inside
top of the housing.
f. Secure disconnect switch bracket in place by tightening screws.
Installation of Recessed Back Box
in Existing Construction
1. Provide a wall opening 14-1/2" (362mm) wide by 18-1/2"
(470mm) high at the desired mounting height, but no closer than
8" (203mm) from floor. (See Figure 2.)
2. Power Supply Wiring
NOTE: Wiring Compartment Volume - 119in3 (1950cm3).
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. Remove disconnect switch bracket by loosening the two screws
on the right side.
c. Install a cable clamp in the “knockout” in the top of back box.
d. Insert power supply cable through cable clamp, allowing
approximately 6" (152mm) of cable length to remain inside the
back box to facilitate connections.
3. Mounting Back Box
a. Place the back box into wall opening flush with finished wall
surface on bottom and sides of box. (Top flange of back box
should protrude approximately 1/2" or 12.7mm from finished
wall surface).
b. Secure the back box in place with wood screws or nails.
4. Wiring Disconnect Switch
a. Connect the power supply wires to the blue wires of the
disconnect switch using wire connectors (see wiring diagram,
pg. 3.)
b. Ground the back box using the green ground screw located in
the inside top of the box.
c. Secure disconnect switch bracket in place by tightening screws.
Installation of Back Box with
Surface-Mounting Frame (See Figure 3)
1. Secure back box to wall with knockouts in upper right hand
corner using screws and anchors.
2. Hang the surface-mounting frame on the back box. Ensure that
the back edge of the surface-mounting frame is flush against the
wall.
NOTE: If heater is located in a high traffic area, where it may be
subjected to vandalism or abuse, take extreme care to see that the
box is firmly attached to the wall.
3. Power Supply Wiring
NOTE: Wiring Compartment Volume - 119in3 (1950cm3).
a.Run a power supply cable into the area to the upper right
corner of the mounting frame. Arrangement of wiring to this
point must be in accordance with National and Local codes.
Refer to specifications on page 2 for proper wire size.
NOTE: If the wiring is to run through the wall, cut a hole in the area
of the top of the back box. Run the supply wire through this hole.
Then remove the “knockout” from the
top of the box and proceed
to step C.
IMPORTANT
CAUTION
WARNING
DO NOT INSTALL HEATER UPSIDE DOWN OR SIDEWAYS.
DO NOT USE HEATER WITHOUT GRILLE.
FOR WALL MOUNTING ONLY. DO NOT INSTALL HEATER CLOS-
ER 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
Back Box
Fig. 2: Locating Recessed Back Box in Existing Construction
VOLTS
277
208
208
240/208
240/208
277/240
208
208
240/208
240
277/240
WATTS
3000/1500
4000/2000
4000
4000/3000
2000/1500
4000/3000
4000/3000
2000/1500
4800
4800
4800/3600
4800
4800/3600
MODEL #
FRA3027B
FRA4020B
FRA40203B
FRA4024B
FRA40243B
FRA4027B
FRA4820B
FRA48203B
FRA4824B
FRA48243B
FRA4827B
PH
1
1
3
1
3
1
1
3
1
3
1
WIRE SIZE
12 AWG
10 AWG
14 AWG
10 AWG
12 AWG
14 AWG
12 AWG
10 AWG
12 AWG
10 AWG
14 AWG
10 AWG
2
8” (203mm) MIN
!
BTU/HR
10,239/5120
13,652/6826
13,652
13,652/10,239
6826/5120
13,652/10,239
13,652/10,239
6826/5120
16,382
16,382
16,382/12,287
16,382
16,382/12,287
AMPS
10.8/5.4
19.2/9.6
11.1
16.7/14.45
8.3/7.2
9.7
14.4/12.5
7.2/6.3
23.1
13.4
20.0/17.3
11.6
17.3/15.0
TABLE 1
BACK
BOX
!
!
Fig. 3: Surface Mounting Installation
MOUNT BACK BOX
TO WALL USING
REAR MOUNTING
HOLES.
HANG FRAME
ON BACK BOX.
15-5/32 "
(385mm)
19"
(482mm)
3-13/16"
(97mm)
