Technical data

12
The FR10 is an intelligent room thermostat that enables
load compensation and will offer energy savings compared
to standard on/off controls.
The FR10’s load compensation feature means that,
rather than just switching the boiler on and off, it will
adjust the flow temperature of the central heating water in
line with set heating temperature requirements. The smaller
the difference between the actual temperature and the
set-point temperature, the lower the flow temperature
from the boiler.
In this way the FR10 minimises boiler cycling so less energy
is wasted in firing up the boiler after each ‘off’ cycle.
Typically, the FR10 is mounted on the wall in the same
position in the property as a traditional thermostat.
As with traditional thermostats, any radiators in the
same space as the controller should NOT be fitted
with a thermostatic radiator valve (TRV).
Operation by the user is very similar to traditional
thermostats, with a large clear display and simple
dial for adjusting set-point temperature. Consequently,
it is very easy to explain to the end user.
FR10 controllers are fully compatible with Worcester’s
popular MT10 and DT20 plug-in timers. They can be
used with the Greenstar CDi and Greenstar CDi Classic
System boilers which have been fitted with an optional
plug-in diverter valve.
Installation
The accuracy of the FR10 is dependent upon the installation
location.
Any radiator in the same room as the FR10 should
NOT have a thermostatic radiator valve fitted.
The FR10 should be installed so that the overall
temperature of the property is monitored, for example,
hallways or landings and not be installed in a living room
or room with supplementary heating.
Electrical connections
The FR10 does not require a 230V mains supply. Instead
connection is made to the boiler via the BUS connections,
on the Heatronic 3 circuit board within the appliance. All
BUS connections are polarity free.
Permissible cable lengths and cross sections for use with
the FR10 are shown in the table below:
To avoid inductive interference, lay all BUS cables separately
to lines of 230V or 400V (minimum spacing 100mm).
In case of external inductive interference, screened cables
should be used. This ensures that the cables are shielded
from external interference (e.g. heavy current cables,
overhead wires, transformer stations, radio and television
sets, amateur radio stations, microwave ovens etc).
FR10 Intelligent Room Thermostat
Cable length Cross-section
≤ 80m 0.40mm
2
≤ 100m 0.50mm
2
≤ 150m 0.75mm
2
≤ 200m 1.00mm
2
≤ 300m 1.50mm
2