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CentaurPlus C21 & C27 Series 2
Installation Instructions
Horstmann CentaurPlus C21 and C27 two channel programmers offer up
to three on/off periods a day for hot water and heating with a hot water
boost and heating advance facility.
Installation and connection should only be carried out by
a suitably qualified person and in accordance with the current edition
of the IEE wiring regulations.
WARNING: Isolate mains supply before commencing installation.
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Summary of Contents for Horstmann CentaurPlus C21
- Page 1 CentaurPlus C21 & C27 Series 2 Installation Instructions Horstmann CentaurPlus C21 and C27 two channel programmers offer up to three on/off periods a day for hot water and heating with a hot water boost and heating advance facility. Installation and connection should only be carried out by a suitably qualified person and in accordance with the current edition of the IEE wiring regulations.
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Page 2: Electrical Connections
Fitting the backplate Once the backplate has been removed from the packaging please ensure the programmer is re-sealed to prevent damage from dust and debris. The backplate should be fitted with the wiring terminals located at the top and in a position that allows a total clearance at last 50mm around the unit. -
Page 3: New Installations
New installations Example circuit diagrams for some typical installations are shown below. These diagrams are schematic and should be used as a guide only. Please ensure that all installations comply with current IEE regulations. For reasons of space and clarity not every system has been included and the diagrams have been simplified - for example some Earth connections have been omitted. - Page 4 New installations Example circuit diagrams for some typical installations are shown below. These diagrams are schematic and should be used as a guide only. Please ensure that all installations comply with current IEE regulations. For reasons of space and clarity not every system has been included and the diagrams have been simplified - for example some Earth connections have been omitted.
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Page 5: General Information
Fitting the programmer If surface wiring has been used, remove the knockout/insert from the bottom of the programmer to accommodate it. Loosen the two ‘captive’ retaining screws on the bottom of the backplate. Now fit the programmer to the backplate, ensuring the lugs on the backplate engage with the control. -
Page 6: Specification
Specification CentaurPlus C21 & C27 CONTACT RATING: CLOCK: 3 (1) Amps 230V AC 12 hour AM/PM CONTACT TYPE: Auto BST/GMT changeover Micro-disconnection DISPLAY SUPPLY: Back lit liquid crystal 230V AC 50Hz only DISPLAYED TIME ADJUSTMENTS: Pollution Degree 2 1 minute steps...