SIBER PREMIUM DF EVO - Operation; Description; By - Pass Conditions; Anti - Ice Security

I 11
4 OPERATION
4.1 DESCRIPTION
The unit is delivered ready to be connected to the power supply and works fully automatically. The stale air extracted from inside
transfers the thermal energy (calories/B.T.U.s) to the fresh air coming from outside. This saves energy in air-conditioning, as the new,
clean air is blown into the house at a conditioned temperature (cool in summer, warm in winter).
Depending on the type of control unit used, up to 5 ventilation positions are possible. The air flow rate is regulated by the regulating
position. Constant volume control allows the air flow rate of the supply and extract fans to be obtained independently of the duct
pressure.
4.2 BY
-
PASS CONDITIONS
The By-Pass fitted as standard allows fresh air to be blown in directly from outside without passing through the heat exchanger, so that
the comfort temperature outside at any given time can be used, for example on summer nights when it is desirable for fresh air to enter
from outside to cool the inside of the house (free-cooling).
The by-pass valve is automatically activated when a certain number of conditions are met (see table below for by-pass values).
4.3 ANTI
-
ICE SECURITY
To prevent the formation of ice in the heat exchanger at very low outdoor temperatures, the SIBER DF EVO 1/2 is equipped with anti-
icing protection.
Thermostatic probes measure the temperatures in the heat exchanger and if necessary a progressive unbalance is set in the automatic
equipment. Up to -2 degrees the Unit would stop and check every hour if the temperature is suitable for operation.
By-Pass gate conditions
By-pass valve open
• The outside temperature is above 10ºC.
• The outside temperature is lower than the internal temperature of the dwelling.
By-pass valve
closed
• The outside temperature is below 10°C.
• The outside temperature is higher than the internal temperature of the dwelling.