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The Horstmann 425 Tiara and Diadem programmers are 2 circuit central heating and hot water programmers able to switch ON and OFF twice every 24 hours. User Guide • E7q PDF manual download and more Horstmann online manuals. Switch Clock dial Neon Indicators Boost timer INSTALLATION AND CONNECTION The Horstmann CentaurPlus C11 timeswitch will allow up to 3 ON/OFF settings per 24 hours and has a 1 hour manual boost and advance button to.The Horstmann CentaurPlus C21 two channel programmer gives independent control over hot water and heating with up to 3 ON/OFF settings per 24 hours. Clock dial. USER INSTRUCTIONS. Boost timer-. ISOLATE. MAINS. BEFORE. OPENING. OR. SERVICING. IMMERSION. HEATER(S). FRONT VIEW OF ECONOMY 7 QUARTZ. 1 hour. The View and Download Horstmann Electronic 7 user operating instructions manual online. Water Heater Controller. Electronic 7 controller pdf manual download.