Installation manual

61
... an explanation 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 this 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 eat up any faster. How
quickly the room heats up depends on the design of the
heating system, for example, the size of 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 18°C, 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 choose 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?
Your programmable room thermostat allows you to
programme different temperatures at different time
periods. You can programme one set of times and
temperatures for week days with a different set of
temperatures for weekend days, this is referred to as 5/2
day operation.
The thermostat can also be set up by your installer to
provide one set of times and temperatures that are
repeated each day of the week. This is referred to as 24
hour operation. The thermostat can also be set by you to
provide two different programming blocks which can then
be assigned to any day of the week, this is referred to as
A/B programme operation.
All thermostats can be set by your installer to provide up
2, 4 or 6 time and temperature settings each day. All
thermostats feature useful overrides, including a
programmable frost setting.
Your thermostat has some advanced features which the
installer will set-up if they are required. There are also a
number of advanced features which can be set up by you.
These advanced settings alter the way that your
thermostat operates, some also affect the programming
functions and the user overrides. Please read the User
Advanced Programming instructions before programming
the unit (see page 67).
Preset programmes
Your TP5000 Si comes ready programmed with a set of
operating times and temperatures which suit most
people. Please remember that some of the options
available will depend on how the installer has set up the
unit.
Programmable room stat
An introduction to your programmable room thermostat?