Eaton AT18HM Installation Instruction Download Page 2

ENGLISH

AT18HM - INSTALLATION INSTRUCTION FOR ASTRONOMIC PROGRAMMABLE TIMER

www.eaton.com

www.eaton.com/wiringdevices 

EIS-0269-EFS (REV. A)

SETTING THE DAWN/DUSK TIME:

1.  Press the

 

☼/☽ 

button to begin setting the dawn/dusk time.

2.  Use the UP/DOWN buttons to set the dusk time then press

 

☼/☽ 

button. See 

     Figure 8.

3.  Use the UP/DOWN buttons to set the dawn time, then press HOME button to exit 

     and return to home screen. See Figure 9.

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

Note: 

In DST ON mode, the timer will automatically adjust backwards and forwards 

1 hour for daylight savings.

FIGURE 6

FIGURE 7

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

FIGURE 8

FIGURE 9

PROGRAMMING ON/OFF TIMES:

1.  Press the PROGRAM button to set the programming times. The display will show 

     “ON PG 1.” See Figure 10.

2.  Press PROGRAM to scroll through the remaining On/Off programs until you reach 

     an available program. There are 7 On/Off programs total. Press SET when you are 

     on the right program.

3.  Use the UP/DOWN buttons to set the time, taking note of the AM/PM on the 

     display. See Figure 11.

4.  Once you are on the current time, press SET again to set the day.

5.  Use the UP/DOWN buttons to scroll the days of the week, choose one of the 

     options:

•  MO, TU, WE, TH, FR, SA, SU (Default)

•  MO, TU, WE, TH, FR

•  MO through SU: Individual days

•  SA, SU

6.   Press HOME button to save and exit

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

FIGURE 10

FIGURE 11

Note: 

During the setting progress, the length of time that you stop operating should not exceed 6 seconds, 

otherwise the setting will fail and screen will return to the original state.

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

ASTRONOMICAL SETTING:

Prior to using the astronomical feature, be sure to set the correct dawn/dusk times.  

Then follow the instructions below to use the feature.

1.  Press the PROGRAM button to set the program times. The display will show “ON 

     PG. 1”

2.  Press PROGRAM to scroll through the remaining ON/OFF programs until you 

     reach an available program. Press SET when you are on the right program.

3.  Press the 

 

☼/☽ 

button to display the dusk time. (Press again to display the dawn 

     time.)

4.  Press SET again to set the day

5.  Press HOME button to save and exit

COUNTDOWN MODE:

Press and hold the ON/OFF button for 3 seconds to enter countdown setting.

1.  Use UP/DOWN buttons to select countdown time (default time is 1 hour).  

See Figure 12.

FIGURE 12

OTHER PROGRAMMING:

REVIEWING PROGRAMS

•  Press the PROGRAM button to scroll through all On/Off programs.

DELETING PROGRAMS

•  Press the PROGRAM button to scroll to the program to be deleted and press 

     MODE/DELETE button to delete. The screen will show the program has been 

     deleted. See Figure 13.

SETTING RANDOM MODE

•  To turn on, press MODE/DELETE button until RND is displayed on the screen. To 

     turn off, press MODE/DELETE button again to enter the manual or automatic 

     setting. See Figure 14.

  ° With random feature (RND), the timer can add additional security by varying 

        the ON/OFF times within 30 minutes of the programmed settings.

  ° There must be a time set in the program in order for this feature to work

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

FIGURE 13

FIGURE 14

OTHER FEATURES:

USING THE THREE AVAILABLE TIMER MODES (OPTIONAL)

REVIEWING PROGRAMS

•  Auto - (Automatic) Timer is in Automatic mode and will operate by the pro

     grammed times

•  MANU - (Manual) This overrides the programmed times and the lights can only 

     be turned ON and OFF by pressing the ON/OFF button

•  RND - (Random) The timer will randomly turn ON/OFF times within 30 minutes of 

     the programmed times.

EATON WIRING DEVICES LIMITED 2 YEAR WARRANTY Eaton Wiring Devices warrants its Astronomic Programmable Timer to be 

free of defects in materials and workmanship in normal use and service for a period of two years from date of original purchase. THIS 

TWO (2) YEAR LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, OBLIGATIONS, OR LIABILITIES, EXPRESSED OR IMPLIED 

(INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE THAT IS IN DURATION IN 

EXCESS OF TWO YEARS FROM THE DATE OF ORIGINAL CONSUMER PURCHASE). NO AGENT, REPRESENTATIVE, OR EMPLOYEE OF 

EATON HAS AUTHORITY TO INCREASE OR ALTER THE OBLIGATIONS OF EATON UNDER THIS WARRANTY. To obtain warranty service 

for any properly installed Eaton Astronomic Programmable Timer that proves defective in normal use send the defective Astronomic 

Programmable Timer prepaid and insured to Quality Control Dept., Eaton Wiring Devices, 203 Cooper Circle, Peachtree City, GA 30269; 

in Canada: Eaton Wiring Devices, 5925 McLaughlin Road, Mississauga, Ontario L5R 1B8. Eaton will repair or replace the defective 

unit, at its option. Eaton will not be responsible under this warranty if examination shows that the defective condition of the unit was 

caused by misuse, abuse, improper installation, alteration, improper maintenance or repair of damage in shipment to Eaton. EATON 

SHALL HAVE NO RESPONSIBILITY FOR INSTALLATION OF THE ASTRONOMIC PROGRAMMABLE TIMER, OR FOR ANY PERSONAL IN-

JURY, PROPERTY DAMAGE, OR ANY SPECIAL, INCIDENTAL, CONTINGENT, OR CONSEQUENTIAL DAMAGES OF ANY KIND, RESULTING 

FROM DEFECTS IN THE ASTRONOMIC PROGRAMMABLE TIMER OR FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY ON THIS 

PRODUCT. THE EXCLUSIVE REMEDY FOR BREACH OF THE LIMITED WARRANTY CONTAINED HEREIN IS THE REPAIR OR REPLACEMENT 

OF THE DEFECTIVE PRODUCT AT EATON’S OPTION. IMPLIED WARRANTIES (IF ANY) INCLUDING, BUT NOT LIMITED TO IMPLIED WAR-

RANTIES OF FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY, ARE LIMITED IN DURATION TO A PERIOD ENDING TWO 

YEARS FROM THE DATE OF ORIGINAL CONSUMER PURCHASE. IN NO CASE SHALL EATON’S LIABILITY UNDER ANY OTHER REMEDY 

PRESCRIBED BY LAW EXCEED THE PURCHASE PRICE. Some states do not allow the exclusion or limitation of incidental or consequen-

tial damages or allow disclaimers or modifications of or limitations on how long an implied warranty lasts, so the above limitations may 

not apply to you. Some Canadian provinces do not allow exclusion or variance of implied warranties so that some or all of the above 

limitations may not apply to you. This warranty gives you specific legal rights and you may also have other rights which vary from state 

to state and province to province. Read enclosed instructions carefully. If you have any questions concerning use or care of this product, 

please write: Consumer Service Division, Eaton Wiring Devices, 203 Cooper Circle, Peachtree City, GA 30269.

WARRANTY INFORMATION

TROUBLESHOOTING TIPS:

Q

: Lights flickering or intermittent power to the load

 

A

: Load has a bad connection

 

A

: Wires not secured firmly with connectors of timer switch

 

A

: Missing load Neutral wire

Q

: Program scheduled turn on but does not turn off

 

A

: Check scheduled off program to ensure all day are selected

Q

: Timer does not switch ON/OFF but display looks normal

 

A

: Timer is set to manual mode. Press Mode button to select Auto Mode.

2.  Use the UP/DOWN buttons to set the current time, taking note of the AM/PM on 

     the display. Press SET when the current time is displayed.

3.  Use the UP/DOWN buttons to select the year then press SET.

4.  Use the UP/DOWN buttons to set the month then press SET.

5.  Use the UP/DOWN buttons to set the day then press SET.

6.  Use the UP/DOWN buttons to set the region zone then press SET. The options are 

     NOR: North, CENT: Central, SOU: South, HAW: Hawaii, PRI: Puerto Rico and MEX: 

     Mexico. See Figure 5.

7.  Use the UP/DOWN buttons to turn DST (Daylight Savings Time) on/off then press 

     SET.

2.  Stop on the time desired, then wait about 10 seconds and the time displayed 

     will stop flashing. The timer is now counting down and the lights will turn off once 

     countdown had completed. The time selected will become the new default setting. 

     During the countdown, hold the ON/OFF buttons for 3 seconds to cancel.

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