Technical data

16
The FW100 is a weather compensation controller that
enables the boiler to anticipate changes in heating
demand in relation to external temperatures. It comprises
a programmable indoor unit to control the boiler and an
external sensor located on a north facing wall.
The indoor unit can be mounted on the fascia of the
boiler using its simple plug-in connection, or wall-mounted
remotely. When wall-mounted, permissible cable lengths
and cross sections are shown opposite.
The FW100 combines the functions of room thermostat and
programmer and incorporates factory-set heat curves for
use with radiators, underfloor heating and fan convectors,
making commissioning very straightforward. The units also
include a manual override for the user to boost or reduce
heating if and when required.
The FW100 offers the user three weekly heating
programmes, with six switching points per day and a weekly
hot water programme with six switching points
per day. For extra convenience there are also pre-set
temperature profiles, including an economy setting to
ensure the home does not get cold when unoccupied and
will warm quickly when switched to comfort setting.
The FW100 is suitable for use with Greenstar CDi combi
and system boilers. It is also compatible with the ISM1
Intelligent Solar Module (see page 19).
When to use weather compensation controllers rather
than room thermostats
There are a number of situations where weather
compensation controllers will offer better control and
higher comfort levels compared to room thermostats.
In choosing the most appropriate solution for the end user
it is important to understand how the system will be used
and the nature of the building.
The list below shows the key criteria that should be
applied when choosing the most appropriate controls and
discussing the options with the end customer:
•
Are there many rooms in the dwelling that are used
frequently and in different ways?
•
Does the dwelling contain windows that are facing in
different directions?
•
Does the home have an open fire, gas fire or other heat
source that does not heat all rooms equally?
•
Does the end user want a higher degree of comfort
control in all rooms?
•
Does the customer accept the pump will run more often
if a higher degree of comfort and better energy utilisation
are to be achieved?
•
Are TRVs installed in all rooms?
•
Are there factors that prevent the heating controller being
installed in the living area?
•
Can an outdoor sensor be installed on a north
facing wall?
•
Does the end user want to achieve optimum comfort with
minimum energy consumption and are they prepared to
pay a little extra for enhanced control?
If the answer to the majority of the questions above is
‘yes’, a weather compensation controller would be the
most suitable option.
The FW100 offers energy savings when compared
to traditional controls and will score highly in
future legislation.
FW100 Weather Compensation Controller