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EXTERNAL ELECTRICAL CONTROLS
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 t a pipe thermostat, preferably on the return pipework.
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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 24.
1. Isolate the mains supply to the boiler.
2. Remove the front panel. Refer to Frame 36.
3. Swing the control box down into the service position. Refer to frame
42.
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.
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