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Endura
®
Delta
en
User
d) Frost protection
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.
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
will return to normal operation automatically.
e) Fireplace function
This menu shows you if the “Fireplace function” has been activated or not. The Fireplace function
can only be activated using an external switch that can be connected to the 24 V DC input
contact on the main board (see 7.1). When turning on this function, the home is temporarily over-
pressurised, so that the fireplace burns easier and more oxygen is temporarily supplied. The time
interval for the Fireplace function can be set using the Installer menu. The difference between the
supply and extraction flow rates can be set in this Installer menu.
Example: you set a differential flow rate of 50 m³/h. The unit operates balanced at a level of
200 m³/h supply and discharge. Upon activating the Fireplace function, the supply increases to
225 m³/h and the discharge decreases to 175 m³/h, so that the supply gains a difference of
50 m³/h.
Summary of Contents for Endura Delta 330
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