Warning – Qmark CDF - Commercial Downflow Ceiling Mounted Heaters User Manual

Page 4

16. Run the power supply cable through the connector, leav-

ing about 8” (203mm) of wire inside the recess mounting
box. (Power supply cable must be #10 AWG min. rated
90°Cmin.)

17. Connect the ground wire to the green ground screw on

the recess mounting box.

18. After wiring is complete, replace and secure the side of

the recess mounting box previously removed in Step 2.

19. Install discharge air grilles. (Refer to “Installation of

Discharge Air Grilles”, page 5.)

INSTALLATION OF RECESS MOUNTED

HEATER IN PLASTER CEILING

1. Determine the desired location of the heater. SEE

WARNING NO. 4 FOR MIN. MOUNTING
CLEARANCES AND WARNING NO. 9.

2. Cut a 22-1/4” x 22-1/4” (565mm x 565mm) mounting

hole in the ceiling for the recess mounting box (Figure
5).

3. Remove the Recess Mounting Box (Figure 6) from the

carton containing the Recess Mounting Enclosure, Type
REA.

4. Remove one of the knockouts and install a cable or con-

duit connector (Figure 6).

5. Install the optional disconnect switch (if required) as

shown in Figure 6.

6. Run the power supply cable through the connector, leav-

ing about 8” (203mm) of wire inside the recess mounting
box. (Power supply cable must be #10 AWG min. rated
90°C min.)

7. Place the recess mounting box in the ceiling opening

and align the marks on the sides of the mounting box
with the bottom of the finished ceiling (Figure 7). This
will position the edge of the mounting box 3/8” (9,5mm)
below the ceiling and will allow the recess face plate to

lay flat against the ceiling.

8. Secure the recess mounting box to the building structure

using a minimum of four fasteners (not supplied).

9. Remove the heater section from its carton.
10. Install optional controls (if required) into the heater sec-

tion in accordance with the Instruction Sheet packaged
with the control.

11. To wire the heater, and/or to convert from single to

three-phase voltage, refer to “Electrical Wiring” (Figure
12, page 5).

12. Position the heater section over the studs in the recess

mounting box (Figure 8).

NOTE: The end of the heater section with the terminal
block must be positioned at the end of the recess mounting
box where the supply wiring enters.

13. Push the heater section onto the studs and securely

tighten four nuts (supplied) on the studs to secure the
heater section to the recess mounting box (Figure 8).

14. Connect the ground wire to the green ground screw on

the recess mounting box.

15. Remove the recess face plate (Figure 8) from the carton

containing the Recess Mounting Enclosure, Type REA.

16. Position the recess face plate over the heater

section/recess mounting box, making sure that the
thumb pins are in the holes in the heater section.

NOTE: The thumb pins are an aid to help position and hold

the recess face plate during installation. Additional sup-
port (Step 18) is required.

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Power Supply

Cable

T-

Bar

Grid

Heater

Wall

12”(305mm) Min.4kw
24”(609mm) Min. 5kw

Wall

22-1/4”
(565mm)

12”(305mm) Min.4kw
24”(609mm) Min. 5kw

8”(2438mm) to Floor Min.
14”(4267mm) to Floor Max..

12”(305mm) Min.4kw
24”(609mm) Min. 5kw

Optional
Disconnect
Switch

Recess
Mounting
Box

Recess Mounting
Box

Recess Face
Plate

Heater
Section

Insure that “Thumb Pin” is pulled
out before positioning the face
plate on the heater section.
Depress “Thumb Pin” after face
plate is sealed firmly against the
heater section.

Thumb Pin Hole

Nut (4)

Stud (4)

Screw (4)

Power
Supply
Cable

3/8” (9.5mm)

Recess
Mounting Box

Cable or
Conduit
Connector

1/2” (12.2mm)
Knockout

Screw (2)

1/2” (12.2mm)
Knockout

7/8” & 1-1/8”
(22.2 & 28.5mm)
Nested Knockout

Grounding
Screw

WARNING

FAILURE TO INSTALL THE FOUR MOUNTING NUTS
COULD RESULT IN THE HEATER FALLING. (SEE FIG. 2)