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 t a pipe
thermostat, preferably on the return pipework.
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 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-t the front
panel ensuring a good seal is made.
5
INSTALLATION
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