7 DAY ELECTRONIC IMMERSION HEATER TIMER - USER MANUAL Instructions of circuit: h. MIN: Set minute combined with button CLOCK or TIMER. Kingshield 7 Day Immersion Heater Digital Timer 6 On/Off Daily T23B-H. Easy to programme. Variable daily program allows you to control hot water in your please can you help me. I have this timer but have lost the mannual fo programming. greenbrook.co.uk/pdf/T23H.pdf. TS900B 24 Hour Immersion. Heater Time Controller. 1. 2. Self-cancelling and. Override switch. Time indicator. Setting pins. 24 hour programme ring.INSTRUCTIONS FOR T23H. 7 DAY ELECTRONIC. IMMERSION HEATER TIMER. MODEL NUMBER. T23H. H Once the timer has been installed,.