CentaurPlus C21 & C27 Series 2. Installation Instructions. Horstmann CentaurPlus C21 and C27 two channel programmers offer up. to three on/off periods a day PROGRAMME indicators. 9.Hot water ON indicator. CENTAURPLUS C27. USER INSTRUCTIONS. QUESTIONS AND ANSWERS. The unit display has become The Horstmann CentaurPlus C27 two channel programmer gives The simple instructions contained in this user guide are designed to help with the. View and Download Horstmann C27 manual online. Two Channel (2 pages). Motherboard Horstmann ChannelPlus H37XL Series 2 Installation Instructions. 4 sept. 2009Horstmann CentaurPlus C21 and C27 two channel programmers offer up to three The backplate may be fitted directly onto a single gang steel flush wiring box CENTAURPLUS C21 - C27. INSTALLATION INSTRUCTIONS. Horstmann's CentaurPlus - Two Channel Programmers Offer up to three programmed operating If surface wiring has been used, remove the knockout/insert from the bottom of the Horstmann's CentaurPlus - Two Channel Programmers Offer up to three I have just installed a C27 controller to my system, which consists of boiler, pump, anyone got a photo of the wiring of the same controller?