!
WARNING
23
ALNOR
®
systemy wentylacji
jest prawnie chronionym znakiem i technicznym patentem. Prawo do zmian zastrzeżone.
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User Manual
HRU-WALL
I
I I
S1
S2
Mode
O
O
OFF
I
O
Speed 1
O
II
Speed 2
I
II
Speed 3
S3
Mode
Heat recovery
(Alternate flow)
Free cooling
switch
S1
switch
S3
switch
S2
5. Operation
5.1 Description of the unit operation
The unit pulls air out for 70 seconds, then it pushes air in for the same time.
When heated air is pulled (extracted) from inside the room, it warms up the heat exchanger; when the cold
air is pushed (supplied) in the room, it gets preheated, recovering most of thermal energy which would be
otherwise lost in the ventilation process.
5.2 Control
HRU-WALL version:
The unit runs at the speed selected by activating the two-position switches “S1”, “S2” and “S3” of the
HRU-WALL-CONTR-I. The same functionality can be achieved with HRU-WALL-CONTR or with 3 two-position
switches.
S3 switch activates the “Free cooling“ (Bypass) mode, which stops alternate flow and keeps the fan in “extract-
only” or “intake-only” mode, to avoid the heat exchange when necessary. To set the extract-only” mode or
“intake-only”, place the integral jumpers as per Fig.20A or Fig.20B.The front cover LED indicates when the
Free cooling mode is on.
An automatic “Boost”mode can be achieved through a dedicated switch or room sensors like SEN-HY, SEN-
PIR or SEN-CO2, connecting such switch in parallel to the S2 switch.
Wiring diagram of one unit: Fig. 18A.
Wiring diagram with ambient sensors: Fig.18B and Fig.18C.
Wiring diagram of two or more units: Fig.18D.
WARNING!
Ensure that the electric wiring to L and N is done correctly; an incorrect connection will lead to
malfunction or permanent damage of the fan.
