Instruction Manual

7
What is a programmer?
... an explanation 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.
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.
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.