6.3 System Shutdown
CAUTION
Drain the appliance and the system when the mains
voltage has been disconnected and there is a chance of
freezing.
1. Drain the appliance using the drain tap.
2. Drain the system at the lowest point.
6.3.1 Frost protection
• In order to avoid freezing of the condensate discharge pipe, the
appliance should be installed in a frost-free room.
• In order to avoid freezing of the appliance (heat exchanger), it has
an appliance frost protection. When the temperature of the heat
exchanger drops to 5ºC, the burner will be activated and the pump
will start running until the temperature of the heat exchanger
reaches10ºC.
• When the system (or a part thereof) can freeze, a frost thermostat
should be installed in the area to be protected. Connect this
according to the wiring diagram. See § 10.1.
Note!
The external frost thermostat is not active when the appliance has been
switched off at the operating panel or when the mains voltage has been
interrupted.
35
