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Single Pole (One location) or 3-Way (Multi-location)

Magnetic Low-Voltage Dimmer

Cat. No. TTM1Ø-1

1000VA-120VAC, 60Hz

For use w/ Cat. No. TTØØR-1 True Touch

TM

 Remote in Multi-Location Applications

INSTALLATION INSTRUCTIONS

WARNINGS AND CAUTIONS:

•  To be installed and/or used in accordance with appropriate electrical codes and regulations.
•  If you are unsure about any part of these instructions, consult a qualifi ed electrician.
•  To avoid overheating and possible damage to this device and other equipment, do not install to
  control a receptacle, fl uorescent lighting, a motor- or a transformer-operated appliance.
•  Use with magnetic low-voltage transformers, incandescent, or 120V halogen fi xtures only. Use a Leviton
  electronic low-voltage dimmer to control electronic (solid state) low-voltage transformers.
•  Total minimum load must exceed 40W or 40VA.

WARNINGS AND CAUTIONS:

•  When a magnetic low-voltage circuit is operated at a dim level, with all lamps inoperative, excess current
  may fl ow through the transformer. To avoid possible transformer failure due to overcurrent, use a
  transformer that incorporates thermal protection or a fuse at the primary windings.
•  Use only one (1) dimmer per load. For remote operation, use Leviton Remote, Cat. No. TTØØR-1.
  Do not use a 3-way switch.
•  Disconnect power at circuit breaker or fuse when servicing fi xture.
•  Use this device only with copper or copper clad wire. With aluminum wire use only devices marked
 CO/ALR 

or 

CU/AL.

Tools needed to install your Dimmer:

Slotted/Phillips Screwdriver 

Electrical Tape

Pliers 

  Pencil

Cutters 

  Ruler

Changing the color of your Dimmer:

Your Dimmer includes two color options. The Dimmer ships with the 
White frame attached. To change color of frame, proceed as follows:

When installing more than one dimmer in the same location, the side 
sections of the mounting strap must be removed. Use pliers to carefully 
bend side sections back and forth until they break off. The side sections 
dissipate heat, so removing them requires a derating of the dimmer’s 
capacity 

(refer to chart).

Installing Dimmer by itself or with other devices:

If installing Dimmer in a single device application, proceed with the 

INSTALLING YOUR  DIMMER

 section. If installing Dimmer in a multi-

device application, proceed as follows:

MULTI-DEVICE APPLICATION:

NOTE: 

You only need to remove side sections if installing with other 

dimmers or if it does not fi t in wall box – not when installing with 
mechanical switches.

Single-Pole:

Look at the back of your switch. 
If there are 2 wires connected 
to  two screw terminals (not 
including a green or bare copper 
wire used for grounding), you 
have a Single-Pole switch. 

3-Way:

Look at the back of your switch.
If there are 3 wires connected 
to  three screw terminals (not 
including a green or bare copper 
wire used for grounding), you 
have a 3-Way switch. 

DO NOT 

add a single-pole switch in this 
location.

INSTALLING YOUR  DIMMER

NOTE:

 Use check boxes       when Steps are completed. 

WARNING:

 To avoid fi re, shock, or death; 

TURN OFF 

POWER

 at circuit breaker or fuse and test that power is off 

before wiring!

Step 1

Bend back and 
forth to remove 
side section

MAXIMUM LOAD PER DIMMER FOR MULTI-DEVICE

More than
2 Devices

Two Devices

Single

Cat. No.

700VA

800VA

TTM1Ø-1

1000VA

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DI-000-TTM10-00A

Step 3
con’t

Tag Common Screw Wire

(screw is usually black and/or 

marked "common")

Remove all 
inner side 
sections

Do not 
remove 
outer 
side 
sections 

Removing existing switch:

 Remove existing  

 

wallplate and switch mounting screws. Carefully pull switch  
from wall box. DO NOT remove wires attached to the switch  
at this time.

Identifying your wiring application (most common):

NOTE:

 If the wiring in the wall box does not resemble any of  

these confi gurations, consult a qualifi ed electrician. 

Step 2

Step 3

Disconnecting switch wires and preparing wires:

•  Disconnect wires from screw terminals or 

Quickwire™ slots (shown).

•  Pull off pre-cut insulation from Dimmer leads.

•  Make sure that the ends of the wires from the 

wall box are 

straight (cut if necessary).

•  Remove 5/8" (1.6 cm) of insulation from each 

wire in the wall box (shown).

• 

For Single-Pole Application, go to Step 5a.

•  For 3-Way Application, go to Step 5b.

5/8"
(1.6 cm)

Strip Gage

Press in slot and 
pull out wire

Step 4

Cut 

(if necessary)

Strip 5/8"
(1.6 cm)

NOTE:

 Ensure cut-out for Air-Gap Switch is positioned on bottom.

Push in side at tab 
to release

Line up tabs and 
press in side to attach

Cut-out for Air 
Gap Switch

MAXIMUM BULB WATTAGE:

Low-voltage dimmers are rated in Volt-Amps (VA). The maximum bulb 
wattage is determined by the effi ciency of the transformer in the low-
voltage lighting system. Transformer effi ciencies will vary from different 
manufacturers; consider 75% effi cient as average. Use the chart to 
determine maximum bulb wattage for typical transformer effi ciency ratings.

MAXIMUM BULB WATTAGE AT 75% EFFICIENCY

More than
2 Devices

Two Devices

Single

Rating

525W

600W

1000VA

750W

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