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2.25 THE WEATHER COMPENSATION KIT - SUPPLIED AS STANDARD
This kit provides the facility to apply outside air temperature
control to the boiler water flow temperature which provides
energy savings. The outside sensor provided measures
outside air temperature and sends a signal to the boiler,
which adjusts the maximum boiler flow temperature in
response. If outside air temperature is greater than the
system design temperature, the boiler flow temperature
is reduced providing running cost savings. The boiler will
operate in the condensing mode more frequently increasing
savings.
Once the sensor is fitted it is automatically detected.
The sensor operation may be configured by adjustment of
the boiler operating parameters, if necessary.
Fitting the Kit
Note. A timer should be fitted to the system so that CH will
be switched off when appropriate.
Fitting the sensor:
The air sensor should be located on an external wall of the
building to be heated. Fix the sensor to a north/north-east
facing wall to avoid direct radiation from the sun. The air
sensor should be located to avoid any heating effect from
the boiler flue.
To fix the air sensor to the wall, unscrew the sensor box
plastic cover and screw/plug the sensor body to the wall.
Wire a twin core 0.5 mm
through an RH grommet located on the underside of the
boiler. Cable length between sensor and boiler should be
no greater than 20 m. Note that this connection is safety
extra low voltage. It is not necessary for the person carrying
out the wiring to be approved to Part P of the Building
Regulations.
Avoid running this cable alongside mains voltage cables.
Wiring the Weather Compensation Kit to the Keston
System
.
2
1. Isolate the electricity supply to the boiler.
2. Remove the boiler front panel (Refer to boiler installation
instructions).
3. Swing the control box down into the service position, unclip
and swing back the installer wiring cover to latch into the
retaining clips. Refer to Section 3.8.
4. Connect the sensor wiring into the RHS of the 4 way
terminal block and secure with the strain relief .
5. Re-assemble in reverse order.
Note. If fitting this with the boiler, then please complete
product Fiche system label, adding % efficiency. This is a
Class II Control (2%).
Installation and Servicing
Section 2 - Installation
cable from the sensor to the boiler
2
Kit Contents
A. Outside Air Sensor
Installer Connections (RHS)
3
29
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