27
INSTALLATION
Keston Combi - Installation and Servicing
26
REPLACING PRE-FITTED MAINS CABLE
If it is necessary to use an alternative mains cable to the one pre-tted
then use the following guide.
Replacement wiring should comply with notes in Frame 23.
1. Isolate the mains supply to the boiler.
2. Remove the front panel. Refer to Frame 39.
3. Swing the control box down into the service position. Refer to
frame 45.
4. Remove the live, neutral and earth wires from the terminal block.
5. Loosen the cable clamp and withdraw the mains cable.
6. Route replacement cable back through the cable clamp and
grommet and re-tighten to provide cord anchorage.
7. Connect the live, neutral and earth wires to the terminal strip.
When making the mains electrical connections to the boiler it is
important that the wires are prepared in such a way that the earth
conductor is longer than the current carrying conductors, such that
if the cord anchorage should slip, the current carrying conductors
become taut before the earthing conductor.
8. Swing the control box back up into the operating position and re-t
the front panel ensuring a good seal is made.
5
4
FITTING THE KIT
Note. A timer should be tted 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 ue.
To x 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 0.5mm
2
cable from the sensor to the boiler through an RH grommet located on the underside of the boiler. Cable
length between sensor and boiler should be no greater than 20m. 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 Combi.
1. Isolate the electricity supply to the boiler.
2. Remove the boiler front panel (refer to
boiler installation instructions).
3. Hinge down the control box.
4. Connect the sensor wiring into the RHS of
the 4 way terminal block and secure with a
cable clamp.
5. Re-assemble in reverse order.
27
FITTING THE WEATHER COMPENSATION KIT - SUPPLIED AS STANDARD
This kit provides the facility to apply outside air temperature control to the boiler
water ow 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 ow temperature in response. If outside air temperature is greater than
the system design temperature, the boiler ow temperature is reduced providing running
cost savings. The boiler will operate in the condensing mode more frequently increasing
savings.
Once the sensor is tted it is automatically detected.
The sensor operation may be congured by adjustment of the boiler operating
parameters, if necessary.
Kit Contents
A. Outside Air Sensor
4
INSTALLATION
(54 pages)
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