FROST PROTECTION
To prevent freezing the appliance is equipped with an internal frost
protection. If the heat exchanger temperature falls too low, the burner
switches on and the pump runs until the heat exchanger temperature
is sufficient. When the appliance frost protection is activated the
symbol code 7
77
7
is displayed (pre heating the heat exchanger).
If the installation (or a part of it) is in danger of freezing, an (external)
frost thermostat must be fitted to the return line at the coldest location.
This must be connected in accordance with the wiring diagram (See
§ 8.3).
Note
If the appliance is out of operation ( -
on
the service display) the appliances internal frost
protection is still active. However, this means there will be no response to a request for heat
from an (external) frost thermostat.
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