CAUTION
Drain the appliance and the installation if mains power has
been interrupted and there is a possibility of freezing.
1. Adjust all valves to manual operation.
2. Drain the appliance at the drain tap.
3. Drain the installation at the lowest point.
9.5.1 Frost protection
•
To avoid freezing of the condensate drain pipe the appliance must be installed in a
frost-free area.
•
To avoid freezing of the appliance it is equipped with frost protection. If the
temperature of the heat exchanger becomes too low, the burner switches on until the
temperature of the heat exchanger is sufficient. If there is a possibility of the
installation (or part of it) freezing, an (external) frost thermostat must be installed at
the coldest point of the return pipe. This must be connected in accordance with the
wiring diagram (See chapter 13).
NOTE
If an (external) frost thermostat has been fittted to the
installation and connected to the appliance, this will not be
active when the appliance is switched off at the operating panel
(
-
--
-
on service display).
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