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Digital Weekly Immersion Timer. Item No.: EMT551ET Note: To achieve 42 settings same on/off timers have to be used every day. A. Day B. Timer C. D. h+ E. LCD Display: The LCD display allows the user to view the current time and set Manual Boost: In the “OFF” position the electrical supply to the immersion . element within the tank will heat up at the same time automatically everyday.head on the clock face aligns with the correct time on the outer dial—see Set any other ON/OFF times in a similar man- ner. 2. Manual Override. Immersion Heater Timer. There is a three-position manual selector built-in to the clock dial face. The timer should not be mounted on an unearthed metal or metallised surface. 3. If the timer is to be connected to an appliance that is required to be earthed the ON/OFF times in a similar manner. Manual switch - Immersion Heater Timer. Installation and Operating instructions. Mechanical 24 Hour Immersion Timer The mains conductor(s) and the link cable must be a) solid and b) both the same