Qmark GFR Series - Fan-Forced Wall Heaters User Manual
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Installation of Back Box In New Construction -
Wall Stud Spacing Greater Than 16” OC.
(Refer to Figure 2)
NOTE: Please review Minimum Clearances, Warning #8 on page 2.
NOTE: Figure 2 depicts the back box installed with the left side
adjoining stud. For a box with the right side adjoining a stud,
reverse the directions shown below.
1. Locate back box and back box support brackets (2). Back
box must be installed with mounting rails to the top (see
Figure 2B)
2. Determine which side of the back box will adjoin stud and
insert back box support bracket on that side with foot tab
directed towards center of back box. On the side of the back
box that will not adjoin stud, install back box support bracket
on that side with foot tab directed towards end of box and
secure to box with 3/8” long sheet metal screw (provided).
See Figure 2A
3. Determine which knockout in back box will be used for field
wiring and remove (see back box drawing pg. 1). Install
strain relief (field supplied).
4. Fish field wiring through strain relief leaving 6” of wire inside
box.
5. Insert back box assembly into wall. The front of the back box
should be flush with the finished wall surface or it may pro-
trude slightly. The back box should never be recessed into
the wall. (see Figure 2). The back box support brackets
should be resting on the sole plate of the stud wall to insure
proper spacing and leveling (see Figure 2B).
6. Use two (2) wood screws or drywall screws or two (2) nails
(field supplied) to secure the side of the back box that adjoins
a stud. Use one (1) wood screw or drywall screw or one (1)
nail (field supplied) to secure the foot tab of the back box
support bracket (that is on the end opposite the stud) to the
sole plate (see Figure 2B).
Installation of Back Box
In Existing Construction
NOTE: Please review Minimum Clearances, Warning 8 on page 2.
1. Locate wall studs to be sure that entire cut-out can be made
between studs. At least one side of the cut-out must be flush
with side of the stud. Bottom of cut-out must be 4” above fin-
ished floor minimum. Make a cut-out in wall 14-1/2” wide X
6-3/4” high (368 mm X 171 mm) (see Figure 3).
2. Determine which knockout in back box will be used for field
wiring and remove (see back box drawing, pg.1). Install
strain relief (field supplied).
3. Fish field wiring through strain relief leaving 6” of wire inside
box.
4. Insert back box into cut-out. The front of the back box should
be flush with the finished wall surface or it may protrude
slightly. The back box should never be recessed into the wall.
beyond the finished surface(see Figure 1C or 2C).
5. Using four (4) wood screws or drywall screws (field supplied)
or four (4) nails (field supplied), secure back box to studs
(see Figure 1B). If wall studs are greater than 16”oc., use
only 2 fasteners and on the opposite end of the back box
drive a 1” sheet metal screw (provided) through hole in end
cap. This will draw the back box tight with drywall when grille
is installed. (See Figure 4.)
TO INSTALL THERMOSTAT ASSEMBLY (T2 only)
NOTE: Thermostat assembly should not be installed until after
the drywall phase of construction is complete. Dust from drywall
installation and joint compound can be harmful if it gets inside
thermostat assembly components.
1. The thermostat must be installed in right end of the heater.
2. Position thermostat above slot in right end of back box. Push
tab on thermostat bracket through slot in top, right end of
back box until the bracket locks in place. See Figure 5.
3. If the thermostat is controlling more than one heater, the total
of all heater amperage ratings (Table 1) cannot exceed 25
amps at 120 volts AC thru 240 volts AC. Refer to Table 2 for
correct wire, circuit breaker, or fuse sizing.
4. Connect one red and one black thermostat lead to power
wiring per wiring diagram (Figure 7) using properly sized list-
ed wirenuts (provided).
5. Fold wires back into wiring compartment behind thermostat
to clear fan deck.
Figure 3
BACK BOX
END CAP
HOLE
Figure 4
End View
Figure 5
BACK BOX (FRONT VIEW)
NAIL OR SCREW
BACK BOX
SUPPORT BKTS.
SOLE PLATE
B
NAIL OR SCREW
STUD
STUD
MOUNTING RAILS
BACK BOX
TOP VIEW
INSERT FAN DECK
THIS SIDE
STUD
Figure 2A
Fig. 2B
Fig. 2C