Electrical
25
8.4 Connecting a Remote
Frost Thermostat
The boiler is fitted with a pre-set internal
frost protection thermostat. If 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 the heating
system or any exposed heating system
pipework, a remote 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
temperature, that is, in a room with a
radiator.
To connect a remote frost thermostat
(for example, a Danfoss Randall
RET230F), proceed as follows:
1. Remove the boiler door, top casing
panel and insulation from boiler.
2. Remove the two screws at top of
control panel (in cross member).
Hinge down control panel front.
3. From rear of control panel, carefully
feed the cable from the Frost
thermostat through the upper
grommet at the right hand end of
the rear of the control panel.
4. Slacken the upper cable clamp on
the inside rear face of the control
panel. Feed the cable through the
cable clamp.
5. Connect wires to terminals on
control panel as follows:
• Frost thermostat Neutral (N) to
terminal 21 on PCB connector.
• Frost thermostat Live (L) to
terminal 24 on PCB connector.
• Frost thermostat Switched Live-
ON (3) to terminal 23 on PCB
connector.
6. Refer to Figure 8-1 for typical
connection of Remote Frost
Thermostat.
7. If an alternative Frost thermostat to
the Danfoss Randall RET230F is
used, connect it in accordance with
the frost thermostat manufacturer’s
instructions.
8. This external frost thermostat will
operate in parallel with the internal
frost thermostat.
9. Re-tighten cable clamp. Re-fit
control panel front and secure using
the two screws.
10. Re-connect the electrical supply.
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