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AT SERIES ARCHITECTURAL DIMMER
Revision 0.3
OWNERS MANUAL
03/16/2020
www.lightronics.com
Lightronics Inc.
509 Central Drive Virginia Beach, VA 23454
Tel 757 486 3588
POWER REQUIREMENTS
The AT Series dimmer requires a 120 or 230VAC hot power feed line for each lighting circuit (channel), a common
neutral, and an earth ground. Each of these feeds must powered by a circuit providing a minimum of 20 Amps and
supplies only one of the AT Series dimmer lighting circuits. The power feed for channel 1 also powers the unit's
internal electronic circuitry. The internal circuitry is protected by a replaceable 1/2 Amp, 250 Volt, fast acting fuse.
The AT dimmer may be operated from either single phase or three phase power and may be switched between
these power types by the user.
INSTALLATION
LOCATION AND MOUNTING
The unit is to be wall mounted using the mounting holes provided in the chassis. Orient the unit such that the circuit
board is in the lower left area of the chassis. The unit may (but is not required to be) spaced out from the wall
approximately 1 inch. This may be desirable if the unit must be used in a location with a high ambient temperature.
Standard sized knockout holes are provided in the top, bottom and right side of the chassis for wiring. Be sure that
the vent holes in the chassis and cover are not obstructed since they are needed for proper cooling.
INPUT POWER CONNECTIONS
WARNING
Make sure that all power is removed from feed circuits before proceeding with wiring.
Connect power input leads to the lower terminal strip positions as indicated on the terminal strip labels. A hot feed
line is needed for each channel. Associated NEUTRALS are to be connected to the NEUTRAL bar provided. An
earth ground is also needed. A ground lug is provided. The terminal strip connection torque specification is 16 lb.-
in. max. The minimum wire size is AWG#12. Consult the applicable electrical codes for your location for exact wire
specifications. The power terminal connections are intended for copper wire only. This unit will work on either
single or three phase power. Any dimmer channel may get power from any phase.
LOAD CONNECTIONS
The AT Series dimmer is a triac based dimmer meant for forward phase loads. You can connect up to 2400 Watts
of lighting to each channel. Connect lighting loads to the upper terminal strip positions as indicated by the label in
the unit (see page 1). The neutral bar and ground lug may be used for lighting loads. The terminal strip connection
torque specification is 16 lb.-in. max.
