Installation
ON
OFF
ON
OFF
ON
OFF
Turning Power OFF.
• Turn power OFF at circuit breaker (or remove fuse).
1
Removing Wallplate and Switch.
• Remove the wallplate and switch mounting screws.
• Carefully remove switch from wall (do not remove wires).
2
Verifying Application.
3
Wiring the Control.
5
Mounting Control(s) to Wallbox.
• Form wires carefully into wallbox, mount and align control(s).
• Install the wallplate(s).
6
ON
OFF
ON
OFF
ON
OFF
Turning Power ON.
• Turn power ON at circuit breaker
(or replace fuse).
7
030-1407
030-1407
English
Turn screws to loosen.
For new construction, go to step 5.
Lutron
Technical Support Center 1.800.523.9466 24 hrs / 7 days www.lutron.com
Dual Incandescent Dimmer/Timer
MA-L3T251
Rated at 120 V~ 60 Hz 300 W Incandescent load and 2.5 A Timer load.
Important Notes
Please read before installing.
1. Only use dimmer with permanently installed incandescent or 120 V~
halogen fixtures. To avoid overheating and possible damage to other
equipment, do not use to control receptacles, fluorescent lighting
fixtures, low-voltage lighting fixtures, motor-driven appliances, or
transformer-supplied appliances.
2. Use timer switch to control any permanently installed lighting or fan load.
Check power requirements for all attached heating devices as they may
max exceed the power limits shown in the capacity chart.
3. Install in accordance with all national and local electrical codes.
4. DO NOT install compact fluorescent (Energy Saver) lamps in the dimmer
circuit, these lamps may only be installed in the timer circuit.
5. Dimmer and timer require separate wires in the wallbox for each load.
6. Do not use for loads operated from two or more locations (3-Way or
4-Way).
7. When no “grounding means” exist within the wallbox then the NEC
®
2008,
Article 404.9 allows a control without a grounding connection to be
installed as a replacement, as long as a plastic, noncombustible wallplate
is used. For this type of installation, cap or remove the green ground wire
on the control and use an appropriate wallplate such as Claro
®
or Satin
Colors® series wallplates by Lutron®.
8. For new installations, install a test switch before installing the control.
9. Protect control from dust and dirt when painting or spackling.
10. Unit will not operate with less than 40 W of load installed on dimmer.
11. It is normal for the control to feel warm to the touch during operation.
12. Clean control with a soft damp cloth only. Do not use any chemical
cleaners.
13. Operate between 32 °F (0 °C) and 104 °F (40 °C)
14. Recommended wallbox depth is 2.5 in (64 mm) minimum.
Multigang Installation
When combining controls in a wallbox, remove all inner side sections before wiring (see
below). Use pliers to bend each side section up and down until it breaks off. Repeat for
each side section to be removed. Reduction of control capacity is also required. Refer to
chart below for maximum capacity.
?
Technical Assistance
If you have questions concerning the installation or operation
of this product, call the Lutron Technical Support Center.
Please provide exact model number when calling.
U.S.A. and Canada (24 hrs/7days)
1.800.523.9466
Other countries (8am – 8pm ET)
+1.610.282.3800
México
+1.888.235.2910
Fax +1.610.282.1243
http://www.lutron.com
• This control mounts in a single-gang wallbox and controls
two loads independently. Independent wires must be
provided for each load.
• Tag the wire that is connected to the feed side of the switch (the side with the
breakoff fin).
• If connecting a fan, fluorescent, low-voltage or other non-incandescent/halogen load,
note which switch and corresponding screw terminal controls it and mark this wire
to be installed on the timed channel in step 5. Failure to do so may damage the load
and control.
Identify Side with
Break-off fin
Tag
• Connect the tagged wire
removed from the feed side
of the switch to the black
screw terminal on the Control
labeled Live.
• Connect one of the remaining
wires controlling an
incandescent/halogen load to
the top brass terminal
labeled Dimmer.
• Connect the remaining wire
removed from the switch to
the remaining brass screw
terminal on the Control
labeled Timer.
• Use wire connectors to
connect the green ground
wire on the Control to the
bare copper or green
ground wire in the wallbox,
and to cap any unused
wires. See wire connector
bag for installation
instructions.
Brass
screws
Black
screw
Green
Wire
Tag
Ground
Wire
Brass
Brass
Live
Black
Neutral
Tag
Ground
Light
120 V~
60 Hz
Dimmer
Timer Switch
Limited Warranty
(Valid only in U.S.A., Canada, Puerto Rico, and the Caribbean.)
Lutron will, at its option, repair or replace any unit that is defective in materials or manufacture
within one year after purchase. For warranty service, return unit to place of purchase or mail to
Lutron at 7200 Suter Rd., Coopersburg, PA 18036-1299, postage pre-paid.
THIS WARRANTY IS IN LIEU OF ALL OTHER EXPRESS WARRANTIES, AND THE
IMPLIED WARRANTY OF MERCHANTABILITY IS LIMITED TO ONE YEAR FROM
PURCHASE. THIS WARRANTY DOES NOT COVER THE COST OF INSTALLATION,
REMOVAL OR REINSTALLATION, OR DAMAGE RESULTING FROM MISUSE, ABUSE, OR
DAMAGE FROM IMPROPER WIRING OR INSTALLATION. THIS WARRANTY DOES NOT
COVER INCIDENTAL OR CONSEQUENTIAL DAMAGES. LUTRON’S LIABILITY ON ANY
CLAIM FOR DAMAGES ARISING OUT OF OR IN CONNECTION WITH THE
MANUFACTURE, SALE, INSTALLATION, DELIVERY, OR USE OF THE UNIT SHALL
NEVER EXCEED THE PURCHASE PRICE OF THE UNIT.
This warranty gives you specific legal rights, and you may have other rights which vary from state to
state. Some states do not allow the exclusion or limitation of incidental or consequential damages,
or limitation on how long an implied warranty may last, so the above limitations may not apply to you.
Lutron, Claro, Maestro, and Satin Colors are registered trademarks
and FASS is a trademark of Lutron Electronics Co., Inc.
NEC is a registered trademark of
National Fire Protection Association, Quincy, Massachusetts.
© 2010 Lutron Electronics Co., Inc.
Important Wiring Information
Trim or strip wallbox wires to the length indicated by the strip gauge on
the back of the control.
Push-in Terminals: Insert wires fully.
Note: Push-in terminals are for use with 14 AWG
(1.5 mm
2
) solid copper wire only. DO NOT use stranded
or twisted wire.
Screw Terminals: Tighten securely.
Screw terminals are for use with 12 AWG (2.5 mm
2
) or
14 AWG (1.5 mm
2
) solid copper wire only. DO NOT use
stranded or twisted wire.
Or
Lutron Electronics Co., Inc.
7200 Suter Road
Coopersburg, PA 18036-1299, U.S.A.
Made and printed in the U.S.A.
11/10 P/N 030-1407 Rev. A
Troubleshooting
Symptoms
Light does not work or no LEDs
turn on.
Top and bottom switches
control wrong loads.
Dimmer and Timer behave
erratically.
Tap switch does not work at
brightest level.
Possible Causes
• Light bulbs burned out.
• Breaker is OFF or tripped.
• Dimmer channel not connected to load.
• Front Accessible Service Switch (FASS
TM) on
Control is pulled out to the off position.
• Wiring error. Call Lutron Technical Support
Center at 1.800.523.9466.
• Wires going to the two brass screws are
reversed.
• Live wire is connected to the dimmer screw. Fix
wiring error to ensure FASS removes power to
both loads.
• Dimmer load is less than 40 W.
Wire Connector:
Use to join one 14 AWG (1.5 mm
2
) or 12 AWG
(2.5 mm
2
) ground wire with one 18 AWG
(0.75 mm
2
) control ground wire.
Twist wire
connector
tight.
Breaking Side Sections
Do Not Remove
Outside Sections
Each Control Has Inside
Section Removed
Middle Control Has Two
Side Sections Removed
Note: This control is rated for fan and lighting loads only.
Light or Fan
Fixture(s)
Dimmer/Timer Capacity Chart
Channel
Dimmer
Timer
Load
Incandescent
120 V~ Halogen
No Sides
Removed
300 W
1 Side
Removed
250 W
2 Sides
Removed
200 W
General Purpose Fan
Incandescent
120 V~ Halogen
Electronic Low-Voltage
Fluorescent
Magnetic Low-Voltage*
2.5 A
300 W
300 VA / 250 W*
2.0 A
250 W
250 VA / 200 W*
1.5 A
200 W
200 VA / 150 W*
4
Disconnecting Switch Wires.
Important Note: Your wall switch may have two wires attached
to the same screw (see illustrations below for examples). Tape
these two wires together before disconnecting. When wiring,
connect wires to the Timer the same way they were connected
to the switch.
Screw Terminals:
Turn screws to loosen.
Push-in Terminals:
Insert screwdriver.
Pull wire out.
One wire in the push-
in terminal and one to
the screw.
One continuous wire
to the screw.
Note: Do not overtighten mounting screws.
Snap on Claro
wallplate.
Start screws.
Align control and
tighten screws.
To verify the control is correctly wired, test to make sure that the dimmer and switch are working
properly on the correct load. If any unexpected behavior occurs, check the troubleshooting guide.
Operation
Light Level Tap Buttons
• Tap once when lights are off -
Lights brighten smoothly to preset
intensity.
• Tap once when lights are on -
Lights dim smoothly to off.
• Tap twice quickly - Lights brighten
rapidly to full intensity.
• Press and hold when lights are on -
Activates delayed fade to off mode.
As the tap button is held, the LEDs
will begin to flash. The first flashing
LED represents a 10 second fade to
off. Each additional flashing LED
represents an additional 10 seconds
of delay before lights fade off (up to
60 seconds delay).
Light Level LEDs
• Indicates approximate
light level.
LEDs may not change
with each press.
FASS
T
TM - Front Accessible
Servie Switch
Important Note:
To replace a bulb, remove power by pulling the
FASS switch out on the Control. For any
procedure other than routine bulb
replacement, power must be disconnected at
the main electrical panel.
To learn about the Advanced Features of Maestro
®
Dimmers including locked preset and
adjustable fade times, please visit:
www.lutron.com/maestro/advfeatures or call the
Lutron Technical Support Center at 1.800.523.9466.
Timer Tap Button
• Tap once when unit is OFF
- Controlled load turns ON and
countdown timer begins.When
time expires, load turns OFF.
• Tap once when unit is on -
Controlled load turns off.
• Tap twice quickly
- Controlled load turns on without
a time limit.
Press to increase light level.
Press to decrease light level.
Press to increase time.
Press to decrease time.
Timer LEDs
• Orange LEDs indicate timer duration or
remaining time in minutes.
• Top green LED labeled On has no time
limit.
• Bottom LED blinks rapidly to indicate
one minute of time remaining.
One Minute Indication:
When only one minute of time is
remaining, the load will briefly turn off
and on to give an indication the timer is
about to turn off.
* The maximum lamp wattage is determined by the efficiency of the transformer, with 70%–85% as typical.
For actual transformer efficiency, contact either the fixture or transformer manufacturer. The total VA rating
of the transformer(s) shall not exceed the VA rating of the timer.
WARNING: Before proceeding, verify that
power to the switch is OFF.
Otherwise, death or serious injury
could result.
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