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What is a programmable room thermostat?
... an explantion for householders.
A programmable room thermostat is both a programmer and a room thermostat.
A programmer allows you to set 'ON and OFF' time periods to suit your own lifestyle.
A room thermostat works by sensing the air temperature, switching on the heating when the air temperature
falls below the thermostat setting and switching it off once the set temperature has been reached.
So, a programmable room thermostat lets you choose what times you want the heating to be on, and what
temperature it should reach while it is on. It will allow you to select different temperatures in your home at
different times of the day (and days of the week) to meet your particular needs.
Turning a programmable room thermostat to a higher setting will not make the room heat up any faster. How
quickly the room heats up depends on the design of the heating system, for example, the size of the boiler and
radiators.
Neither does the setting affect how quickly the room cools down. Turning a programmable room thermostat to a
lower setting will result in the room being controlled at a lower temperature, and saves energy.
The way to set and use your programmable room thermostat is to find the lowest temperature settings that you
are comfortable with at the different times you have chosen, and then leave it alone to do its job. The best way
to do this is to set low temperatures first, say 18ºC and then turn them up by one degree each day until you are
comfortable with the temperatures. You won't have to adjust the thermostat further. Any adjustments above
these settings will waste energy and cost you more money.
If your heating system is a boiler with radiators, there will usually be only one programmable room thermostat to
control the whole house. But you can have different temperatures in individual rooms by installing thermostatic
radiator valves (TRVs) on individual radiators. If you don't have TRVs, you should choose a temperature that is
reasonable for the whole house. If you do have TRVs, you can chose a slightly higher setting to make sure that
even the coldest room is comfortable, then prevent any overheating in other rooms by adjusting the TRVs.
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.
Programmable room thermostats need a free flow of air to sense the temperature, so they must not be covered
by curtains or blocked by furniture. Nearby electric fires, televisions, wall or table lamps may prevent the
thermostat from working properly.
Email: sales@horstmann.co.uk
Website: www.horstmann.co.uk
Horstmann Controls Limited, Bristol BS4 1UP
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Leaflet number P82161 – Issue 2
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