121
Endura
®
Delta
en
User
This menu shows you if the frost protection has been activated (Active)
or deactivated (Inactive). The frost protection will start operating when
the outdoor temperature drops below freezing and there is a risk that
the heat exchanger will freeze up.
d) Frost Protection
For Endura Delta without preheater:
The supply flow rate is gradually decreased so that the portion of warm air supplied is greater
than the portion of cold air supplied. This ensures that freezing of the heat exchanger is prevented
insofar as is possible.
If the supply air is reduced to a minimum and there is still a risk that the heat exchanger could
freeze, then the system will go into frost shutdown. In this case, the supply fan is shut down in
time and air is only extracted from the home. The system will try to reactivate itself after a certain
period of time. However, as long as there is a risk of freezing, the Endura Delta remains in “frost
shutdown”. As soon as temperatures allow, the unit will return to normal operation automatically.
For Endura Delta with preheater:
If there is a risk that the heat exchanger could freeze, then the preheater is activated. This is an
electrical resistance with modular power. Based on the specific need, the power of the preheater
is adjusted so that it preheats as efficiently as possible and the energy consumption is kept under
control.
If there is a preheater available, then an imbalance will never arise between the supply and
extraction flow rates. If there is still a risk that the heat exchanger could freeze after the activation
of the preheater, then both the supply and extraction flow rates are decreased. This way, balance
is maintained.
In extreme cases, the system may go into “frost shutdown”. In this case, the supply fan is shut
down in time and air is only extracted from the home. The system will try to reactivate itself after
a certain period of time. However, as long as there is a risk of freezing, the Endura Delta remains
in “frost shutdown”. As soon as temperatures allow, the unit automatically returns to normal
operation.
Summary of Contents for Endura Delta 330
Page 1: ...Endura Delta Installer User manual...
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