Electrical
31
8.4 Connecting an External
Frost Thermostat
The boiler is fitted with a pre-set internal
frost protection thermostat. Should
either the air temperature around the
boiler, or the water temperature within
the boiler, fall to below 5°C then this
thermostat will be activated to protect
the boiler from freezing.
If necessary, to protect any exposed
heating system and any exposed
pipework, an external frost thermostat
can also be connected to the boiler.
This frost thermostat should be sited
within the house in such a place that it
can detect any rise and fall in the
ambient air temperature, such as, in a
room with a radiator. It is connected to
the boiler as follows:
1. Connect the wires from the frost
thermostat to terminals 23 & 24 on the
connection block. Refer to Figure 8-6,
Figure 8-3 and Figure 8-9 for further
details.
2. Connect the frost thermostat in
accordance with the frost thermostat
manufacturer’s instructions.
This external frost thermostat will
operate in parallel with the internal frost
thermostat.
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