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26 REPLACING PRE-FITTED MAINS CABLE
If it is necessary to use an alternative mains cable to the one
pre-fitted then use the following guide.
Replacement wiring should comply with notes in Frame 24.
1. Isolate the mains supply to the boiler.
2. Remove the front panel. Refer to Frame 35.
3. Swing the control box down into the service position. Refer
to frame 41.
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-fit the front panel ensuring a good seal is made.
27 EXTERNAL ELECTRICAL CONTROLS
Wiring External to the Boiler
The fuse rating should be 3A.
Wiring external to the boiler MUST be in accordance with the current
I.E.E. (BS.7671) Wiring Regulations and any local regulations.
Frost Protection
If parts of the pipework run outside the house or if the boiler will be left off
for more than a day or so then a frost thermostat should be wired into the
system.
The frost thermostat should be sited in a cold place but where it can
sense heat from the system.
Note. If the boiler is installed in a garage it may be necessary to fit a pipe
thermostat, preferably on the return pipework.
30
INSTALLATION
5
Installation and Servicing
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