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Questions?  201.661.9945

©2011 AmerTac™
Saddle River Executive Centre,
One Route 17 South, Saddle River, NJ 07458
www.amertac.com
Made in China

Instruction Manual & Warranty

Indoor

Digital Wall Switch Timer

Limited One Year Warranty

AmerTac™ warrants this product to be free from defects in material and
workmanship for a period of one year from the date of purchase. AmerTac’s
obligations are limited to repairing or replacing any defective unit and are
effective only if such units are returned within one year of the purchase date
to AmerTac, 250 Boulder Drive, Breinigsville, PA 18031. Warranty void if
damage is due to misuse or improper installation. In no circumstance will
AmerTac be liable for consequential or incidental damages relating in any
way to this product.

TMDW40

- Wire in accordance with National and Local Electrical Codes.
- This device requires installation by a licensed electrician or qualified 

professional. Use of high voltage detector or meter is recommended.

- Turn power OFF at circuit breaker or fuse box.
- Remove and disconnect the existing switch.
- Connect TMDW40 wire leads to LOAD according to diagram.
- Turn power back ON at circuit breaker or fuse box.

Getting Started

- Lift up bottom of door using a small flathead screwdriver.
- Position the slide switch to TIMER.
- Press the RESET button using a paper clip.
- The display should flash 12:00AM Monday,

see Figure 1.

- If screen is blank, be sure slide switch is on

time, check LOAD connected to the TMDW40
and check 208-277VAC power source.

Setting Current Time

- Press and hold CLK (Clock) button during entire process.
- Press HOUR button to advance the hours.
- Press MIN button to advance the minutes.
- Press DAY button to advance the day.
(If any key is pressed for a prolonged period, display will advance rapidly)
Release the CLK button once time and day have been entered. Timer is now
ready to be programmed. The colon after the hours will continue to flash,
indicating time is advancing.

Programming ON/OFF Events

1. Press PROG button once, display will look as
shown in Figure 2, indicating ON programming
of timer setting 1.
2. Using HOUR and MIN buttons, enter desired
ON time. It is necessary to press MIN at least
once to have “00” for minutes. By default, all
days are indicated.
3. When complete, press the PROG button again,
display will look as shown in Figure 3, indicating
OFF programming of timer setting 1.
4. Using HOUR and MIN buttons, enter desired OFF time. It is necessary to
press MIN at least once to have “00” for minutes. By default, all days are
indicated. If done, press CLK button to return to current time and day.
5. To set additional ON/OFF cycles (maximum of 7 events) press PROG
button and follow procedures in steps 1 to 4 for each new ON/OFF event.

Block Programming

When programming ON/OFF events, all days are indicated by default, To
change day selection, press DAY button and display will change as follows:
- Individual day (MO, TU, etc)
- MO-FR, SA-SU, MO-SA, MO-SU
- MO-WE-FR, TU-TH-SA
- MO-WE, TH-SA
Follow steps above to complete programming.

Random Function

Turns On/Off within 2-30 minutes of your programmed settings. To activate
Random Function, press DAY and HOUR button until TIMER flashes on
display. Press again to cancel.

Daylight Savings Time Function

Adds 1 hour to current time to adjust for Daylight Savings Time.
Press MIN and HOUR buttons simultaneously until DST is on display.
Press MIN and HOUR buttons again to go back 1 hour.

AM

Figure 1

MO

Figure 2

MO TU WE TH FR SA SU

ON

MO TU WE TH FR SA SU

OFF

Figure 3

RATINGS

208-277V~, 60Hz
10A General Purpose
6A Tungsten
2HP Motor
4A Ballast

AM
PM

MO TU WE TH FR SA SU

ON
OFF

RDM
AUTO

BLACK

*WHITE

208-277VAC Hot

Neutral

RED

LOAD

GROUND

Lights, Fans, Motors, etc.

* Note:

 Ensure neutral (white) wire is present in junction box. If this wire is not present, 

additional wiring will be necessary before installation can be completed.
Consult a qualified electrician.

Off/Timer Switch

To turn off all programs, move switch to OFF position. Timer will not run any
programs when switch is in OFF position. Programs will be saved by battery
for up to 30 days.

Reviewing Programs

To review programs that have been entered, press and release
PROG button to scroll through programs. Any program can be edited by
pressing the HOUR, MIN, and DAY buttons. Press PROG button to accept
changes. When done, press CLK button to return to current time and day.

Deleting Programs

Press PROG button until desired program is displayed.
Press the ON/OFF button until  - - : - - is displayed.
When done, press CLOCK button to return to current time and day.

Manual Override

Pressing ON/OFF button will alternate the unit ON or OFF.

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