High ef
fi
ciency heat recovery unit with cooling circuit -
RHE
-
26
Selection, installation, use and maintenance manual
GB
The assembly of the "free-cooling
kit" accessory must be performed by
qualified personnel in accordance with
the present standards and must be
made following the indications in the
electrical layout supplied with the unit.
The compressor is off during the
functioning of the unit in the free-
cooling mode. The temperature settings
are pre-set at fixed values (on request
these values can be changed by
contacting the After-Sales office).
Operation
The free-cooling function foresees that
the air expelled from the room does not
affect the heat recovery unit, passing
directly to the outside through a duct
connected to the damper B.
In order to use the free-cooling function
a duct is required to connect to damper
A and another to connect to damper
B. The two dampers A and B have an
opposing function.When the outside
temperature is close to the ideal
temperature of the room, damper A is
closed while damper B is open.
Accessory assembly
For the assembly of the free-cooling
accessory please refer to fig. 12:
• p l a c e t h e t wo d a m p e r s w i t h
servomotors as indicated in the figure;
• make sure that the damper is closed
during the free-cooling function
while the damper is open (opposing
functions);
• connect the damper servomotors;
CAUTION!
Before assembling the free-cooling
kit, make sure that the power is not
connected to the unit.
FCH free-cooling accessory
OUTSIDE
ROOM
fig.12
Exhaust air
Fr
esh air
Room airr
External air inlet
External air inlet (in fr
ee-cooling)
External air temp. detector
Room temp. detector
Free-cooling damper motor
Exhaust damper motor
