NO DE-RATING REQUIRED*
*
Suitable for control of dimmable electronic transformers and
tungsten lamps WITHOUT DE-RATING
AU-DSP251 1 Gang 2 Way 40-250VA
AU-DSP252 2 Gang 2 Way 2 x 40-250VA
AU-DSP253 3 Gang 2 Way 3 x 40-250VA
AU-DSP254 4 Gang 2 Way 4 x 40-250VA
AU-DSP401 1 Gang 2 Way 60-400VA
AU-DSP402 2 Gang 2 Way 2 x 60-400VA
DIMMER SWITCH
ROTARY CONTROL - PUSH ON / PUSH OFF
NO DE-RATING REQUIRED*
250W/VA 400W/VA
AURORA ROTARY CONTROL DIMMER SWITCHES - INSTALLATION INSTRUCTIONS
Aurora dimmer switches comply with the latest European Safety and EMC Regulations
Safety Compliance - EN 60669-2-1:2000
EMC Compliance - EN 50015
READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLATION
PLEASE LEAVE A COPY WITH THE USER/MAINTENANCE ENGINEER FOR FUTURE REFERENCE
PRODUCT FEATURES
Push on, push off, rotary dimming control switch.
Suitable for use with Resistive & Inductive loads.
Suitable for control of dimmable electronic transformers, toroidal (wire wound) transformers
and tungsten halogen lamps WITHOUT de-rating.
Integrated over-temperature protection fuse.
Short-circuit protection.
Module case ultrasonically sealed to reduce dimmer buzzing
Smooth dimming operation from 0 - 100%
One or two way switching
One, two, three & four gang versions available
APPLICATIONS
Aurora dimmer switches are suitable for the following applications:
Mains Voltage GLS bulbs - maximum load according to the dimmer label - add the bulb wattages
together.
Mains Voltage halogen bulbs - maximum load according to the dimmer - add the bulb wattages
together. De-rating NOT required.
Electronic & Wire Wound low Voltage lighting transformers - maximum load according to the dimmer
label - add the VA ratings of the transformers together. De-rating NOT required.
Fans - maximum load according to the dimmer - add the wattages of the fans together.
De-rating NOT required.
DO NOT use this dimmer switch for fluorescent or energy saving lamps. These types of loads will
eventually damage this dimmer switch beyond repair. Incorrect use will invalidate the guarantee.
FAULT FINDING
Each dimmer module has a minimum and maximum load rating - see the label on the module.
Dimmers must not be under-loaded or overloaded. Under-loading may cause the lamp(s) to flash.
Overloading will cause the dimmer overload protection to operate and the lights to be switched off.
Removal of the overload will allow the overload protection to reset.
When this dimmer is used to control low voltage lighting transformers, choose a transformer with a
maximum VA rating close to the rating of the lamp it supplies. For example use a 60VA transformer for
a 50W low voltage lamp. Do not overload the transformers.
If a dimmer overload occurs when controlling transformers a correctly calculated number of
transformers, it is likely that the transformers are presenting a bigger load than their rated value.
In this case, remove one or some transformers from the circuit or use a higher rated dimmer.
INSTALLATION
READ THESE INSTRUCTIONS CAREFULLY. IF IN ANY DOUBT, CONSULT A QUALIFIED ELECTRICIAN
1. Switch off the power at the mains. Remove the existing switch taking note of the wiring of the switch
and the terminal markings. If there are two or more wires in one terminal on the old switch they must
be put in the same terminal in the dimmer switch.
2. Clear the wall mounting box of plaster debris etc and ensure that there are no projecting screws.
Dimmers on 1 gang plates fit wall boxes with 60.3mm screw fixing centres. Dimmers on 2 gang
plates fit wall boxes with 120.6mm fixing centres. Most models can fit into a 16mm plaster depth
box or a standard surface mounted pattress. Recessed mounting boxes with 4 fixing lugs must have
the top and bottom lugs bent flat or broken off to allow the dimmer switch to fit.
3. To connect the dimmer switch for 1 or 2-way switching, please refer to the diagrams overleaf.
4. When stripping the cables for wiring ensure that no bare conductors can project from the terminals.
5. Dimmer switches with a metal front plate MUST be earthed using the Earth terminal or Earth fly lead
on the front plate.
6. After connecting the wiring push the dimmer switch back towards the wall box ensuring the that the
wiring is not trapped between the back of the dimmer module and the mounting box or the front
plate and the mounting box, tighten the plate fixing screws provided. Do not over-tighten the fixing
screws or you may distort or break the front plate.
7. When installation is complete switch on the mains supply and push the dimmer knob to operate.
Adjust the rotary knob until the desired light level is reached.
Please note - DO NOT perform insulation resistance tests on a lighting circuit with a dimmer switch
connected. An insulation resistance test may damage the electronic components in the dimmer
beyond repair.
A slight buzzing noise may be heard from the dimmer switch in operation, this is perfectly normal.
WIRING CIRCUITS
Aurora rotary dimmer switches are suitable for 1 or 2-way lighting circuits.
The dimmer has a push-on, push-off switch action and a rotary action to dim the light.
Each dimmer module has 3 screw terminals, L1, L2 & C (common).
1-Way Switching
In 1-way lighting circuits each light is controlled by 1 switch. Your Aurora dimmer switch should
replace this switch.
Remove the existing switch taking note of the wiring of the switch and the terminal markings.
Connect the two wires either way round, to the C terminal and either L1 or L2. One of the L terminals is
not used for 1-way switching. See Figure 1.
1-way switching wiring diagram
Figure 1
Dimmer switch replaces
the on/off plate switch
Connect the wires to the C
terminal and one of the L
terminals, either way round.
2-Way Switching
2-Way lighting circuits have two switches controlling the same lights from two different locations.
This arrangement is commonly used at the top and bottom of staircases or at the entry and exit doors
to a room.
Only one standard plate switch may be replaced with a dimmer switch for 2-way switching applications
or the lights will flicker on and off. There are commonly two ways to wire 2-way switching.
See figures 2 & 3 for typical 2-way circuits.
Remove one of the existing switches taking note of the wiring of the switch and the terminal markings.
The wires connected to the COMMON terminal of the plate switch should be connected to the
C terminal of the dimmer switch. The wires connected to the other two terminals of the plate switch
should be connected either way round to terminals L1 & L2 of the dimmer switch.
Light(s) or Transformer(s)
2-way switching wiring diagrams
Figure 2
2-Way dimmer connection
The dimmer switch must only replace
one of the 2-way plate switches
GUARANTEE
This product is guaranteed for a period of 1 year from the date of purchase. The guarantee is invalid
in the case of improper use or installation, tampering, removal of the Q.C. date label, installation in an
improper working environment or installation not in accordance with the current edition of the I.E.E.
Wiring Regulations (BS 7671).
This product must not have been used with fluorescent or energy saving lamps or overloaded beyond
its rating. It must only have been used on a 200-240-Volt supply.
Should this product fail during the guarantee period it will be replaced free of charge, subject to correct
installation and return of the faulty unit. Aurora does not accept responsibility for any installation costs
associated with replacement of this product. Your statutory rights are not affected. Aurora reserve the
right to alter specifications without prior notice.
Aurora Ltd. Unit 16, Alban Park, Hatfield Road, St. Albans, Hertfordshire. AL4 0JJ
Figure 3
Alternative 2-Way dimmer connection
AU-DSP251_252_253_254_401_402_V1_08
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