CAUTION
Drain the appliance and the installation if mains power has
been interrupted and there is a possibility of freezing.
1. Drain the appliance at the drain tap.
2. Drain the installation at the lowest point.
3. Close the main cock for the water supply to the DHW section.
4. Drain the appliance by removing the DHW couplings below the appliance.
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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