Horstmann CentaurPlus C21 User Operating Instructions Manual
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Horstmann CentaurPlus C21 User Operating Instructions Manual

Two channel central heating and hot water programmer
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CentaurPlus C21
User Operating Instructions
Two Channel Central Heating and Hot Water Programmer
The Horstmann C21 two channel programmer gives independent control
over hot water and heating with up to 3 ON/OFF settings per 24 hours.
It also has a 1 hour manual boost button for the hot water and an advance
button for the central heating.
There is also a programming switch allowing permanent selection of:
OFF/ON/AUTO/ALL DAY.
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Summary of Contents for Horstmann CentaurPlus C21

  • Page 1 User Operating Instructions Two Channel Central Heating and Hot Water Programmer The Horstmann C21 two channel programmer gives independent control over hot water and heating with up to 3 ON/OFF settings per 24 hours. It also has a 1 hour manual boost button for the hot water and an advance button for the central heating.

  • Page 2: Main Unit Overview

    The CentaurPlus C21 Programmer The simple instructions contained in this user guide are designed to help with the programming and operation of the unit. 1 15 SET indicator - RUN is the normal position Time of day Switch period symbol SET button Hot Water BOOST or adjust (-) button Central Heating ADVANCE or adjust (+) button...

  • Page 3: Manual Overrides

    Fully Pumped or gravity System The installer will have set the programmer to suit the installed system. This is normally a Fully Pumped system which will allow independent control of the central heating and hot water, however on an old Gravity system the central heating and hot water are linked so that it is not possible to use the central heating independently.

  • Page 4: Programme Override Facilities

    Programme Override Facilities With the CentaurPlus C21 programmer operating in the normal running mode it is possible to alter the functionality of the programme on each individual channel by means of the CH and HW buttons. The options include; aUTO - Channel follows all programmed ‘ON’...

  • Page 5: Setting On/Off Times

    Setting the Time of day Press the SeT Press the SeT button until Use PLUS and button until    SeT indicator is MINUS buttons SeT indicator Press eNTer to adjust time is next to rUN next to CLOCK position position 12:00...

  • Page 6: Resetting Programmer

    resetting the Programmer Electronic equipment can in some circumstances be affected by electrical interference. If the programmer’s display becomes frozen or scrambled; or if you wish to revert back to the default time settings please reset by pressing the SET and CH buttons together as shown below.
  • Page 7 What is a programmer? ... an explantion for householders. Programmers allow you to set ‘On’ and ‘Off’ time periods. Some models switch the central heating and domestic hot water on and off at the same time; while others allow the domestic hot water and heating to come on and go off at different times.
  • Page 8 Email: sales@horstmann.co.uk Website: www.horstmann.co.uk Horstmann Controls Limited, Bristol BS4 1UP Leaflet number P60497 – Issue 5...

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