To prevent freezing of the appliance it is equipped with appliance
frost protection. If the heat exchanger temperature falls to low, the
burner switches on and the pump runs until the heat exchanger
temperature is sufficient. When the appliance frost protection is
actuated code
7 ‘
is displayed (pre heating exchanger).
• If the installation (or a part of it) can freeze, 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 section 11.2.)
Remark
When the appliance is out of action (
-
--
-
on the service display), the
appliance frost protection is still active. However, there will be no
response to heat demand from an (external) frost thermostat.
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