Horstmann ThermoPlus AS2-RF User's Guide download pdf (Page 16)

Website: www.horstmann.co.uk

Horstmann Controls Limited, Bristol BS4 1UP

Leaflet number P83020 – Issue 2

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.

What is a programmable room thermostat?

…an explanation for householders.

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Horstmann ThermoPlus AS2-RF User's Guide Page 16