Dimplex AC3CN User manual

08/19239/4 - Issue 7
AC3CN Recessed Ceiling Heater / Over Door Heater
The product complies with the European Safety Standards EN60335-2-30 and the European Standard Electromagnetic Compatibility (EMC) EN55014, EN60555-2 and
EN60555-3. These cover the essential requirements of EEC Directives 2006/95/EC and 2004/108/EC
0.250SCALE

IMPORTANT: THESE INSTRUCTIONS SHOULD BE READ CAREFULLY AND RETAINED FOR
FUTURE REFERENCE
IMPORTANT SAFETY ADVICE
DO NOT COVER OR OBSTRUCT the air inlet or outlet grille.
ENSURE THE APPLIANCE IS EARTHED.
Do not use this heater in areas where excessive dust exists.
This heater must not be located immediately above or below a fixed socket outlet or connection box.
Always disconnect supply before working on the product.
This product should be mounted safely to solid wall or ceiling surfaces only.
Ensure the supply cables are of adequate current carrying capacity and are protected by a suitable
fuse.
If the appliance is mounted in a toilet or washroom, the appliance should be mounted such that no part
of it can be touched by a person using a fixed bath or shower.
If the appliance is mounted in a toilet or washroom an isolating switch must be provided outside the
washroom adjacent to the entrance door.
This appliance can be used by children aged from 8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the hazards
involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made
by children without supervision.
Children of less than 3 years should be kept away unless continuously supervised. Children aged from
3 years and less than 8 years shall only switch on/off the appliance provided that it has been placed or
installed in its intended normal operating position and they have been given supervision or instruction
concerning use of the appliance in a safe way and understand the hazards involved. Children aged
from 3 years and less than 8 years shall not plug in, regulate and clean the appliance or perform user
maintenance.
CAUTION — Some parts of this product can become very hot and cause burns. Particular
attention has to be given where children and vulnerable people are present.
This heater is not equipped with a device to control the room temperature. Do not use this heater in
small rooms when they are occupied by persons not capable of leaving the room on their own, unless
constant supervision is provided.
DO NOT COVER OR OBSTRUCT the air inlet/outlet ceiling grille.
A minimum distance of 1.5 metres must be observed between the ceiling grille and any furniture,
combustible material or furnishings.
This appliance must not be installed less than 1.8 metres above the floor.
WARNING: ENSURE THIS PRODUCT IS EARTHED.
A suitable isolator to the fixed wiring of the premises must be provided adjacent to the final position of
the Switch Panel. An Isolator must be fitted close to the heater to allow for servicing
This product must not be subjected to water spray or immersion and should be mounted such that no
part of it can be touched by a person using a fixed bath or shower.
This product should be mounted safely into ceiling areas only.

The ceiling can be either of a plasterboard (or similar) construction, or of suspended ceiling tiles.
DO NOT store or use any •ammable materials or sprays in the vicinity of the heater – FIRE HAZARD.
DO NOT insert any foreign objects into the heater openings.
Risk of injury, electric shock or damage to the heater may occur.
Ensure proper manual handling procedures are observed at all times.
ATTENTION: IN ORDER TO
AVOID OVERHEATING DO
NOT COVER.

General
The carton contains: -
• 1 x AC3CN heater
• 1 x Switch box
This Recessed Ceiling Heater / Over Door Heater is a robust heater intended
for installation into a suspended or plasterboard ceiling.
For optimum results, do not install this product in ceilings higher than 3 metres.
If multiple heaters are installed, generous spacing should be provided between
heaters to achieve an even heating distribution.
Electrical Connection
The Electrical connection of this product should be carried out by a competent
electrician and be in accordance with the current IEE wiring regulations.
A suitable local isolating switch must be provided in the electrical supply circuit
with at least 3mm clearance on each pole.
Connection of Heater
Gain access to the terminal block (see ‘x’ in Fig. 2) by unlocking the grill by
moving the two slides in the direction of the arrows (see ’A’ in Fig. 2) as shown
using a small screwdriver or other suitable tool. Open the grill and feed the
appropriate cable through the cable gland (see ‘Y’ in Fig. 2).
WARNING: Ensure power cable path does not come into contact with internal
heater elements or fans.
Make connections as per wiring Diagram (see Fig. 3) and close the grille.
Connection of Switch Panel
The mains electrical supply cable and power cable to this heater (neither
supplied) should be connected as per the wiring diagram shown in
Fig. 4 (see Fig. 5 for Switch No.’s).
Label Description
1ON - OFF (Double Pole Switch)
2HALF HEAT (Single Pole Switch)
3SECOND HALF HEAT (Single Pole Switch)
T TERMINAL BLOCK
M MAINS IN POWER CABLE (NOT SUPPLIED)
BBLOWER MOTOR
E HEATER ELEMENT
TTERMINAL BLOCK
CPOWER CABLE FROM SWITCH PANEL TO
HEATER (5 core - NOT SUPPLIED)
IIsolators
∗Test all switch settings once installation is
complete ∗
Installation of Switch Panel
X
Y
AFig. 2
Fig. 1
Recessed Ceiling Heater / Over Door Heater
Model: AC3CN
Model Loading Current Voltage Weight
(kW) (amps) (volts) (kg)
AC3CN 3 13 ∼230-240 8.7
579
271
209
639
330
105
48
500
T
H1 H2N NL L
I
0
C
M
1 2 3
Fig. 3
Fig. 4
M
I
I

400
265
Access Panel
Doorway
Fig. 7
275
Fig. 5
85
145
120
134
48
75
123
Fig. 1
Fig
Fig
Fig
Fig
Fig
Fig
. 1
500mm 105mm
271mm
579mm
Fig. 6
WARNING: The Switch Panel should not be installed in a toilet or washroom.
The backing box (standard B.S. double gang as shown in Fig. 5) should be
!xed to a suitable wall. Suitable wall conduit should be used where applicable
to carry the cable between the heater and the switch panel. A suitable recessed
wall box may be substituted, as an alternative.
Installation of Heater
The Installation of this product must only be carried out by a prescribed
competent person in accordance with Building Regulations and the current IEE
Wiring Regulations for electrical equipment.
This heater can either be installed into a suspended or plasterboard ceiling.
First it is necessary to ensure that there is suf!cient space above the ceiling
for the Installation of this product (see Fig. 1 and Fig. 7).
This product is designed to be suspended by threaded rod or wires/chains.
Always ensure this unit is adequately supported when installed.
Installation in a Ceiling
A hole as indicated in Fig. 1 and Fig. 6 must be cut into the ceiling. Allow an additional
amount for clearance. It may be necessary to !x an internal supporting frame
around the newly cut aperture in a plasterboard ceiling or suspended ceiling.
To mount the unit into the ceiling void, use lengths of threaded bar or hooks
(not supplied) screwed into the M8 threaded inserts located in the top side of
the heater (see Fig. 1 for dimensions). Adjust the height of the heater so the
inner edge of the grill surround is "ush with the ceiling.
Installation in a Bulk Head
(over doorway)
A hole (579x271mm) as indicated in
Fig. 7, must be cut into the ceiling part
of the bulk head. Drop rods should be
used to mount the appliance in such a
position, as to have the base "ush with
the ceiling. An access panel should
also be provided on the front of the
bulkhead. This provides access to the
top of the appliance and cable entry
point. Access for wiring the appliance
is via the grille.
Operation of Switch Panel
Switch on electrical supply (MAINS IN)
to the Switch Panel.
Switching the switch marked ‘I’ (see ‘1’ in Fig. 5) energises the fan and switches
on the electrical supply to the heater.
The heat selection switches allow heat settings to be chosen as shown
below:
Settings - I Fan Only
I + Fan + 1/2Heat
I + Fan + Full Heat
The desired setting can be obtained through switch selection.
WARNING This heater is not equipped with a device to control the
room temperature. Do not use this heater in small rooms when they
are occupied by persons not capable of leaving the room on their own,
unless constant supervision is provided.
This appliance is not intended for use by persons (including children)
with reduced physical, sensory or metal capabilities, or lack of
experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for
their safety.
Children should be supervised to ensure that they do not play with the
appliance.

Thermal Safety cut-out(s)
The power supply to the heating elements will be interrupted if one or a
combination of the following abnormal events occur:
1. Air inlet/outlet panel is obstructed.
2. I n t e r n a l v e n t i l a t i o n i s i m p a i r e d d u e t o b u i l d u p o f d u s t
and •uff.
3. Blower unit stalls.
Note : If the cut-out operates, the heater must be turned off immediately to
avoid damage to the heater. Please follow the ‘Procedure for resetting cut-
out(s)’ explained below.
Procedure for resetting cut-out(s)
Establish the cause and eliminate the fault.
Reset the thermal cut-out(s), located behind the air outlet (for detail view see
Fig. 11).
Press the black reset button (see ‘g’ in Fig. 11) on the side of the cut-out (see
‘f’ in Fig. 11) as described in steps 2 - 4 :-
Steps to reset cut-out(s)
1. Disconnect the power supply.
2. Pass small •at head screwdriver through air inlet/outlet panel ‘B’ to button
side of the cut-out (see ‘g’ in Fig. 11) avoiding contact with the element
(see ‘e’ in Fig. 11).
3. Press the reset button in direction shown in Fig. 11 to reset the cut-out.
(cut-out clicks when reset)
4. Remove the screwdriver carefully.
5. Turn on the supply.
If the cut-out continues to operate, the heater should be switched off and an
engineer called.
Maintenance
WARNING: ALWAYS DISCONNECT HEATER FROM THE POWER SUPPLY
BEFORE ATTEMPTING ANY MAINTENANCE.
The heater should be serviced annually. Any dust or debris should be
removed from the grille and elements, taking care not to damage the
elements.
Cleaning the Heater & Switch Panel
External and grille appearance can be maintained by occasionally vacuuming
and wiping with a light duster. External appearance of the switch panel can be
maintained by wiping occasionally with a duster or for stain removal, a weak
soap solution can be applied with a cloth and the surface wiped dry.
Note: Care must be taken to avoid any moisture ingress into the switch
panel.
After Sales Service
Your product is guaranteed for one year from the date of purchase.
Within this period, we undertake to repair or exchange this product free of
charge provided it has been installed and operated in accordance with these
instructions.
Your rights under this guarantee are additional to your statutory rights, which
in turn are not affected by this guarantee.
Should you require after sales information or assistance with this product
please go to www.dimplex.co.uk where you will !nd our self help guide by
clicking on “After Sales” or ring our helpdesk on the number shown on the rear
of this booklet.
Please retain your receipt as proof of purchase.
ee
ff
gg
B
Fig. 11

DIMPLEX
MILLBROOK HOUSE
GRANGE DRIVE
HEDGE END
SOUTHAMPTON
SO30 2DF
TEL: [phone]
FAX: [phone]
WEBSITE: www.dimplex.co.uk
Republic of Ireland Tel. [phone]
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A division of GDC Group Ltd.