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6

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.

After initial installation it is advisable, before programming the CentaurPlus for the first 
time, to reset the unit. Resetting can only be achieved with the power ‘ON’ by pressing 
the SET and CH buttons together. This will return the programmer to the factory set default 
times.

SET

CH

Press the SeT and CH buttons 
together then release the buttons 
and the programmer will return to 
preset factory settings

general Information

BaTTery

The programmer is fitted with a non-rechargeable, long life battery, which will 
maintain the programmed time settings for a minimum of ten months with the supply 
disconnected.
THIS SHOULD BE SUFFICIENT TO COVER POWER INTERRUPTIONS DURING THE LIFE OF THE UNIT.            
During power interruptions the display will be blank, after 3 days the current time of day 
will be lost. These measures are to prolong the battery life.

ServICe aNd rePaIr

This programmer is NOT user serviceable. Please do not dismantle the unit.
In the unlikely event of a fault developing please refer to the RESETTING THE PROGRAMMER 
section of this user guide shown above. If this fails to resolve the problem please contact a 
local heating engineer or a qualified electrician.

Summary of Contents for CentaurPlus C21

Page 1: ...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 CentaurPlus C21 User Operating Instructions 1 ...

Page 2: ...tch period symbol 4 SET button 5 Hot Water BOOST or adjust button 6 Central Heating ADVANCE or adjust button 7 Hot Water HW programme select button or ENTER button 8 Central Heating CH programme select button 9 Hot Water ON indicator 10 Central Heating ON indicator 11 SET positions 12 PROGRAMME positions 13 BOOST symbol 14 ADVANCE symbol 15 AM PM symbol 16 PROGRAMME indicators 1 15 11 3 9 12 4 5 6...

Page 3: ...ed 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 This will allow only one common tim...

Page 4: ...y independent it is possible to have them set differently if necessary All of the settings above will be permanent i e unaffected by programme times until alteration by the user The diagram below illustrates how to alter the setting it assumes that the channel is in the AUTO mode to begin with Press HW or CH once Programme goes from AUTO to ALL DAY Programme will operate from 1st ON until 3rd OFF ...

Page 5: ...the SET button until SET indicator is next to CLOCK position Press the SET button until SET indicator is next to the HW or CH PROG position Repeat this process for 2nd and 3rd settings Use PLUS and MINUS buttons to adjust time Use PLUS and MINUS buttons to adjust 1st ON time Press the SET button until SET indicator is returned to RUN position Use PLUS and MINUS buttons to adjust 1st OFF time Press...

Page 6: ...se the buttons and the programmer will return to preset factory settings General Information BATTERY The programmer is fitted with a non rechargeable long life battery which will maintain the programmed time settings for a minimum of ten months with the supply disconnected THIS SHOULD BE SUFFICIENT TO COVER POWER INTERRUPTIONS DURING THE LIFE OF THE UNIT During power interruptions the display will...

Page 7: ...nder the chosen On and Off heating periods or be permanently off The time on the programmer must be correct Some types have to be adjusted in Spring and Autumn at the changes between Greenwich Mean Time and British Summer Time You may be able to temporarily adjust the heating programme for example Override Advance or Boost These are explained in the manufacturer s instructions The heating will not...

Page 8: ...Email sales horstmann co uk Website www horstmann co uk Horstmann Controls Limited Bristol BS4 1UP Leaflet number P60497 Issue 5 8 ...

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