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ENGLISH

AT18HM - INSTALLATION INSTRUCTION FOR ASTRONOMIC PROGRAMMABLE TIMER

www.eaton.com

www.eaton.com/wiringdevices 

EIS-0269-EFS (REV. A)

Single-Pole Installation:

1.  Take the existing wall switch 

out of the wall box, but do not remove the wires.

2.  Identify and label all the wires, then remove existing switch

3.  Connect the timer to the wires as shown. See Figure 1. Connect the HOT (Line) 

  to the HOT terminal of the timer. Connect the load wire to the LOAD terminal of 

  the timer. Connect the neutral wire to the NEUTRAL terminal of the timer. Connect 

  the ground wire to the GROUND terminal of the timer. Be sure that all the terminal 

  screws are tight.

4.  Tuck the wires into the wall box and leave room for the timer.

5.  Mount the timer to the wall box and install the wallplate.

6.  Restore power at the circuit breaker.

TR

AVELER

LOAD

NEUTRAL

LINE

Traveler

Load / Charge / Carga

Traveler

TR

AVELER

LOAD

NEUTRAL

LINE

Neutral

Traveler

Traveler

Ground

TR

AVELER

LOAD

NEUTRAL

LINE

Load Charge Carga

Neutral

Neutre

Neutro 

Hot Chaude Línea

POWER

ALIMENTATION

ALIMENTACIÓN

POWER

ALIMENTATION

ALIMENTACIÓN

Ground 

Mise à la terre

Conexión a tierra

Ground 

Mise à la terre

Conexión a tierra

Ground 

Mise à la terre

Conexión a tierra

POWER ALIMENTATION ALIMENTACIÓN

Ground Mise à la terre Conexión a tierra

Hot / Chaude / Línea

Neutral

Neutre

Neutro 

Hot

Chaude

Línea

Ground / Mise à la terre / 

Conexión a tierra

Load

Charge

Carga

Neutral/Neutre/Neutro 

TR

AVELER

LOAD

NEUTRAL

LINE

Traveler

Load / Charge / Carga

Traveler

TR

AVELER

LOAD

NEUTRAL

LINE

Neutral

Traveler

Traveler

Ground

TR

AVELER

LOAD

NEUTRAL

LINE

Load Charge Carga

Neutral

Neutre

Neutro 

Hot Chaude Línea

POWER

ALIMENTATION

ALIMENTACIÓN

POWER

ALIMENTATION

ALIMENTACIÓN

Ground 

Mise à la terre

Conexión a tierra

Ground 

Mise à la terre

Conexión a tierra

Ground 

Mise à la terre

Conexión a tierra

POWER ALIMENTATION ALIMENTACIÓN

Ground Mise à la terre Conexión a tierra

Hot / Chaude / Línea

Neutral

Neutre

Neutro 

Hot

Chaude

Línea

Ground / Mise à la terre / 

Conexión a tierra

Load

Charge

Carga

Neutral/Neutre/Neutro 

Model: AT18HM

Astronomic Programmable Timer

FEATURES:

•  Astronomical feature: Automatically adjusts dusk  

  to dawn times

•  Total of 7 on, 7 off programmable settings

•  Single pole or three way installations

•  Random ON/OFF operation for security

•  Manual override

•  Battery backup: Programs will be saved during  

  power outages

•  Daylight Savings: Auto adjusts for daylight  

  savings   time

•  Replaces standard wall switch

•  Back-lit LCD screen

•  Works with CFL, LED and incandescent bulbs

SPECIFICATIONS

Voltage..................................................................................................................120VAC, 60Hz

Resistive.........................................................................................................................15Amps

Tungsten...........................................................................................................................1200W

Standard Ballast............................................................................................................1200VA

Electronic Ballast/ LED............................................................................................5A (600W)

Motor..................................................................................................................................1/2HP

WARNING

Turn the power off at the circuit breaker before installing the 

timer.

Read and understand these instructions before installing. This device is intended for 

installation in accordance with the National Electrical Code as well as local regulations.  

It is recommended that a qualified electrician performs this installation. Make sure to  

turn off the circuit breaker or fuse(s) before wiring the device.

Use copper wire only.

Pre-Installation Requirements:

•  This timer 

requires

 that your switch box have a neutral wire for proper installation

     in order to operate correctly. If you open up your switch box and only see 2 wires, 

     this indicates that your switch box does not have a neutral wire and this timer will 

     not work.

•  This timer will work in a single pole or 3-way installation. It will not work in a 

     4-way installation.

•  This timer is rated for loads up to 15 amps.

FIGURE 1:

Single pole installation

Installation unipolaire

Instalación 1 polo

Part

Description

1

DISPLAY

: easy-to-read digital 

display

2

SET

: press to set the calendar, clock, 

region and daylight saving setting

3

PROG

: press to set daily on/off 

times

4

DAWN/DUSK

: press to change the 

default dawn/dusk times

5

MODE/DELETE

: press to choose 

from auto, manual or random modes, 

when the timer is in program mode, 

this button deletes program settings

6

ON/OFF AND TIMER OVERRIDE

press to turn load on/off and hold to 

start the countdown function

7

UP/DOWN BUTTON

: press to 

change selected value

8

RESET

: press to reset the timer to 

return to default settings.

9

HOME

: press to return to Home 

screen

Buttons 

Description

ON

MO TU WE TH FR SA SU

A

O

MO TU WE TH FR SA SU

OFF

FR

A

Daylight Savings

ON

INDICATOR

AM/PM

A

INDICATORS

P

DAWN INDICATOR

P

A

DUSK INDICATOR

COUNTDOWN

INDICATOR

ON

SETTING TIME AND REGION:

1.  Open the faceplate. Gently press RESET to clear all programs and set timer to 

     default settings. Press the SET button to begin setting the timer and calendar.

     The time “12:00 am” will be flashing. See Figure 6.

FIGURE 5

AT18HM

TR

AVELER

LOAD

NEUTRAL

LINE

Traveler

Load / Charge / Carga

Traveler

TR

AVELER

LOAD

NEUTRAL

LINE

Neutral

Traveler

Traveler

Ground

TR

AVELER

LOAD

NEUTRAL

LINE

Load Charge Carga

Neutral

Neutre

Neutro 

Hot Chaude Línea

POWER

ALIMENTATION

ALIMENTACIÓN

POWER

ALIMENTATION

ALIMENTACIÓN

Ground 

Mise à la terre

Conexión a tierra

Ground 

Mise à la terre

Conexión a tierra

Ground 

Mise à la terre

Conexión a tierra

POWER ALIMENTATION ALIMENTACIÓN

Ground Mise à la terre Conexión a tierra

Hot / Chaude / Línea

Neutral

Neutre

Neutro 

Hot

Chaude

Línea

Ground / Mise à la terre / 

Conexión a tierra

Load

Charge

Carga

Neutral/Neutre/Neutro 

FIGURE 2

3-way installation

Installation à 3 voies

Instalación de tres vías 

Timer at load side

Minuterie du côté charge

Temporizador en el lado de carga

FIGURE 3:

3-way installation

Installation à 3 voies

Instalación de tres vías 

Timer at load side

Minuterie du côté charge

Temporizador en el lado de carga

FIGURE 4

1.  DISPLAY

 ÉCRAN
 PANTALLA

2.  SET

 RÉGLAGE
 CONFIGURAR

3.  PROG

 PROG
 PROGRAMACIÓN

4.  DAWN/DUSK
 

LEVER ET COUCHER  

DU SOLEIL

 AMANECER/ 

ATARDECER

5.  MODEL/DELETE
 

MODÈLE/SUPPRIMER

 MODELO/ELIMINAR

7.  UP/DOWN BUTTON
 

BOUTON HAUT/BAS

  BOTÓN ARRIBA/

ABAJO

8.  RESET

 RÉINITIALISER
 RESTABLECER

9.  HOME

 ACCUEIL
 INICIO

6. ON/OFF AND TIMER 

OVERRIDE 

 

MARCHE/ARRÊT ET 

CONTOURNEMENT  

DE LA MINUTERIE

 ENCENDIDO/APAGADO 

 

Y ANULACIÓN DEL  

TEMPORIZADOR

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