Horstmann CentaurPlus C27 User Operating Instructions Manual page 8

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.
Set the 'On' and 'Off' time periods to suit your own lifestyle. On some programmers you
must also set whether you want the heating and hot water to run continuously, run under
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 work if the room thermostat has switched the heating off. And, if
you have a hot-water cylinder, the water heating will not work if the cylinder thermostat
detects that the hot water has reached the correct temperature.
Email: sales@horstmann.co.uk
Website: www.horstmann.co.uk
Horstmann Controls Limited, Bristol BS4 1UP
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Leaflet number P60498 – Issue 5