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way whatsoever without the express written permission of the author. V1.0 02/24
RANDOM MODE
This turns the load on and off semi-randomly, eg using a table light or radio to give the impression a
house is occupied. The timer must be in AUTO mode. Then press the RND button to start random
operation. An [R] symbol shows in the display (above the seconds digits). It operates continually like
this until you press RND again.
Random mode overrides any programmed times (1-20) as well as the Countdown ‘d’ timer. During
random timing, power ‘off’ lasts for 26-42 minutes and power ‘on’ lasts for 10-26 minutes.
Strangely, it’s not possible to link this random operation to a timed programme. The timer operates
randomly all the time it’s in AUTO mode. So unfortunately you can’t set it to come on only at night,
for example.
DAYLIGHT SAVING TIME/ BRITISH SUMMER TIME
To advance the clock one hour for DST/ BST, press CLOCK and ˅- (DOWN) at the same time. The
button markings show ‘S’ for this function. An [S] symbol will appear in the display. Repeat to
reverse it again.
RESETTING
The RESET button can be pressed with a ballpoint pen which will clear the timer settings completely.
If the display has gone blank – a sign of a failing battery - try pressing RESET to see if it restores the
clock display again.
ABOUT THE BATTERY
The EMT757 has a built-in rechargeable NiMh cell that powers the digital clock (but not the relay),
even if the timer isn’t plugged in. This also keeps the clock going even if there’s a power cut. The
battery recharges fully within 2 hours and lasts for many months (or longer) between charges.
Experience shows the battery lasts for many years. Whilst it’s possible to replace it by soldering in a
new one, the 1.2V cell is non-standard and difficult to obtain. I found it wasn’t worth the effort. If
the battery has worn out, the timer switch should be disposed of in electrical waste.
TYPE EMT757
20 PROGRAMMES, 7 DAYS
12 or 24 HOUR DISPLAY
COUNTDOWN TIMER – up to 99 hours 59 mins UP/ DOWN
RANDOM SETTING (aways on, not timed)
DAYLIGHT SAVING TIME ADJUST (manual, not automatic)
INTERNAL BATTERY - 1.2V NiMH / not user-replaceable
MAXIMUM RATING - 2,000W 8 AMPS @ 240V
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