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The Horstmann 425 Coronet timeswitch is a single circuit central heating The simple instructions contained in this user guide are designed to help with The battery requires charging before the clock will rotate, this can take up to 15 minutes. ECONOMY 7 QUARTZ. INSTALLATION INSTRUCTIONS. HORSTMANN. QUESTIONS MOVE TAPPET UNTIL. REACHING THE DESIRED. OFF TIME. REPEAT PREVIOUS. INSTRUCTIONS FOR SECOND. ON/OFF. SETTINGS. USING TAPPETS 2 AND 4. MOVE THE. PROGRAMME. Note: rotating the dial the wrong way could result in damage to the Timer. Advance Facility. The SM1 Electro Mechanical Programmer is fitted with one