Dimplex CMH Series Installation Instructions Manual

Ceiling Heater (with ConnexTM)
CMH Series

IMPORTANT INSTRUCTIONS

When using electrical appliances, basic precautions should always
be followed to reduce the risk of re, electric shock and injury to per­son, including the following:

1. Read all instructions before using this heater.

2. The heater is hot when in use. To avoid burns, do not let bare

skin touch hot surfaces. Keep combustible materials, such as
furniture, pillows, bedding, papers, clothes, and curtains at least
a 3.3 ft (1 m) from the front of the heater and keep them away
from the sides and rear.

3. Wiring procedures and connections should be in accordance
with the National Electric Code (NEC & CEC) and local codes.

4. Extreme caution is necessary when any heater is used by or

near children or invalids and whenever the unit is left operating

and unattended.

5. Do not operate any heater after it malfunctions. Disconnect

power at service panel and have heater inspected by a certied

electrician before reusing.

6. To disconnect heater, turn off power to heater circuit at main dis-
connect panel.

7. Do not use outdoors.

8. Use this heater only as described in this manual. Any other use

not recommended by the manufacturer may cause re, electric
shock, or injury to persons.

9. A heater has hot and arcing or sparking parts inside. Do not use
it in areas where gasoline, paint or ammable liquids are used

or stored.

10. This heater is hot when in use. To avoid burns, do not let bare

skin touch hot surfaces. Keep combustible materials such as:
furniture, pillows, bedding, papers, clothes and curtains away
from heater.

11. Do not insert or allow foreign objects to enter any ventilation or
exhaust opening as this may cause an electric shock or re, or
damage the heater.

12. To prevent a possible re, do not block air intake or exhaust in
any manner.

!

NOTE: This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
in a residential installation. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one of the
following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment on a circuit different from that to which the
receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

FCC CAUTION: Any changes or modications not expressly approved by
the party responsible for compliance could void the user’s authority to operate
this equipment.

This device complies with Industry Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions: (1) this device may not
cause interference, and (2) this device must accept any interference, including
interference that may cause undesired operation of the device.

Installation Instructions

Figure 1

7.5 - 10 kW

Mounting
Bracket

WARNING: Wiring procedures and connections should be
in accordance with the National Electric code (NEC) and local
codes.

WARNING: To reduce the risk of re, do not store or use
gasoline or other ammable vapors and liquids in the vicinity

of the heater.

CAUTION: It is recommended that two people install the

unit.

CAUTION: The heater should be mounted for DOWN­WARD discharge only.

Surface Mount

1. Unpack the heater from the carton and remove the two

screws securing the bracket to the unit, to remove the
mounting bracket, and remove the terminal box covers.

(Figure 1)

CAUTION: Care should be taken when removing the termi­nal box cover, as the electrical connections are attached to it.

2. Determine the desired location for the heater and secure

the mounting bracket to the ceiling (hardware not includ-

ed).

CAUTION: The ceiling and mounting hardware must have
adequate strength to support the heater. Attachment to a rm
support is a necessity.

!

NOTE: See Figure 2 for minimum clearances for the unit.

Figure 2

MINIMUM

2-5kW - 10" (250mm)

7.5-10kW - 16" (410mm)

Inspection Cover

Terminal
Box Cover

2 - 5 kW

2-5 kW - 6' (152 cm)

8 ft (244 cm)

7.5-10 kW - 8' (213 cm)

Inspection

Cover

Terminal Box Cover

SAVE THESE INSTRUCTIONS

7213180100R04

3. Remove the desired knockout from the terminal box.

!

NOTE: It is only necessary to remove the knockout(s) that
will feed the power supply wiring, keeping in mind the heater
mounting location and supply wire location.

4. Hang the heater from the hooked edge of the mounting

bracket and proceed to the wiring instructions.

Hanging Mount (Threaded Rod)

1. Unpack the heater from the carton, remove the two screws

securing the bracket to the unit and remove the screws
securing the terminal box cover. (Figure 1)

CAUTION: Care should be taken when removing the termi-

nal box cover, as the electrical connections are attached to it.

!

NOTE: See Figure 2 for minimum clearances for the unit.

2. There are four brackets on the top surface of the unit with

1/2 in. (13 mm) holes which can be used to suspend the
unit from an open ceiling using 3/8” (9.5 mm) threaded

rod.

3. Remove the desired knockout from the terminal box.

!

NOTE: It is only necessary to remove the knockout(s) that
will feed the power supply wiring, keeping in mind the heater
mounting location and supply wire location.

Wiring

WARNING: Wiring procedures and connections should be

in accordance with the National Electric Code (NEC) and local
codes.

1. Run supply wiring of proper voltage and wire size to the

location of the terminal box of the heater. (See Table 2)
Supply wiring should be enclosed in 1/2 in. (13 mm) con-

duit.

2. Wire all heaters and controls in accordance with the ap-

propriate wiring diagram.

!

NOTE: The wiring diagram for specic unit is located on

top of the heater.

Table 2 - Recommended minimum supply wire sizes are
listed in the table below:

MAXIMUM WATTS PER CIRCUIT USING 75 °C WIRE

(COPPER WIRE)

Rough in

Wire Size

14 1440 2496 2880 3324 4164 5760 7200

12 1920 3328 3840 4432 5552 7680 9600

10 2880 4992 5760 6648 8328 11520 14400

!

NOTE: Supply wire entry is commonly made into one
heater. Though wiring (factory furnished) can be used for con­nection to adjacent heaters.

3. Wrap the supply ground wire around the green ground

screw and tighten.

4. Do a nal and complete check of all wiring then replace the

terminal box covers being careful not to pinch any wires.

5. The terminal box covers may now be reinstalled.

WARNING: TO PREVENT THE RISK OF FIRE OR IN-

JURY, DO NOT OPERATE THE HEATER UNLESS IT IS
FULLY ASSEMBLED.

120V 208V 240V 277V 347V 480V 600V

!

NOTE: The inspection cover is intended to provide access

for electrical inspections.

6. Swing the heater upwards to secure the opposite side of

the heater to the bracket and secure with previously re­moved screws.

Initial Set Up

After the unit has been installed, calibration of the unit to the
area will be required. This can be done by closing all doors
and windows to the room and turning the unit ON. When the
unit is initially turned on there is a 28 minute period of calibra-

tion of the unit where the software runs at full power for 20

minutes, then runs for 8 minutes to cool the heater down.
If the unit is relocated or the size of the area that it is installed

in changes, it is recommended that the unit be reset to the fac­tory default to allow the unit to recalibrate.

Factory Default

1. Press and hold the V for 3 seconds. Both the and
icons will begin to ash.

2. Within 5 seconds press ✚, then ✚, then –, then –, then

V, then –.

Sample Wiring Diagrams

240V 2/3/4/5KW 1PH

SENSOR

DISPLAY BOARD

14
13
12

H1

11
10

H2

9

H3

TB1
8
7
6
5

POWER BOARD

TB3

4
3
2
1

TB2

CUTOUT

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

347/600V 3/4/5KW 1PH

SENSOR

DISPLAY BOARD

14
13
12
11
10

9

20A

TB1

CONTACTOR

8
7
6
5

POWER BOARD

TB3
4
3
2
1

TB2

CUTOUT

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

208V/240V 7.5/10KW 1PH

SENSOR

DISPLAY BOARD

14
13
12
11
10
9

30A

TB1

CONTACTOR

8
7
6
5

POWER BOARD

TB3
4
3
2
1

TB2

CUTOUT

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

L1

T1

H1

L1

T1

H1

TRANSFOMER

FAN

MOTOR

FAN

MOTOR

MOTOR

347/600V240V

L1

T1

H2

G

L1

T1

H2

G

480V/600V 7.5/10KW 1PH

SENSOR

DISPLAY BOARD

POWER BOARD

14
13
12
11
10

9

TB1
8
7
6
5

TB3
4
3
2
1

TB2

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

20A

CONTACTOR

CUTOUT

L1

T1

H1

TRANSFOMER

240V

FAN

MOTOR

480V/600V

H2

G

L1

T1

FAN

CONTACTOR

CONTACTOR

CONTACTOR

L1

L2

G

L1

20A

H3

L2

L1

40A

H3

L2

L1

20A

H3

L2

240V 3/4/5KW 3PH

SENSOR

DISPLAY BOARD

CUTOUT

14
13
12

H1

11
10

H2

9

H3

TB1
8
7
6
5

POWER BOARD

TB3
4
3
2
1

TB2

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

600V 3/4/5KW 3PH

SENSOR

DISPLAY BOARD

14
13
12
11
10
9

8
7
6
5

POWER BOARD

208V 7.5/10KW 3PH

DISPLAY BOARD

POWER BOARD

TB1

CONTACTOR

TB3
4
3
2
1

TB2

CUTOUT

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

SENSOR

14
13
12
11
10

9

TB1

CONTACTOR

8

7

6

5

TB3
4
3
2
1

TB2

CUTOUT

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

L1

20A

T1

H1

30A

H1

FAN

MOTOR

TRANSFOMER

240V 347/600V

FAN

MOTOR

T1

FAN

MOTOR

G

L1

T1

H2 H3

G

H2

G

L1L1

T1

L1

L2

L3

20A

CONTACTOR

CONTACTOR

H3

L2

L1

40A

L3

277V/347V/480V/600V 7.5/10KW 3PH

SENSOR

DISPLAY BOARD

POWER BOARD

14
13
12
11
10

9

TB1
8
7
6
5

TB3
4
3
2
1

TB2

T1/FAN LOW

T3/FAN HIGH

T2/FAN NEUTRAL

T4/L2

20A

CONTACTOR

CUTOUT

L1

T1

H1

TRANSFOMER

240V

FAN

MOTOR

277V/347V/480V/600V

L1

CONTACTOR

T1

H2

G

L2

L1

30A

H3

L2

L1

L3

L3

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