Horstmann CentaurPlus C21 Series 2 User Operating Instructions Manual Download Page 6

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 Series 2

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 pr...

Page 2: ...ch 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...

Page 3: ...d 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 heat...

Page 4: ...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 illus...

Page 5: ...Use the and buttons to adjust the minutes and press ENTER Use the and buttons to set the date and press ENTER Use the and buttons to set the month and press ENTER Use the and buttons to set the year...

Page 6: ...e 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 programme...

Page 7: ...der 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 Tim...

Page 8: ...Email sales horstmann co uk Website www horstmann co uk Horstmann Controls Limited Bristol BS4 1UP Leaflet number P84362 Issue 1 8...

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