9
OPERATION DESCRIPTION
The picture below shows the unit plan with its main internal components and air flows.
1 - Air/air heat recuperator
2 - Cooling compressor;
3 - water-supplied finned coil;
4 - Cooling evaporator;
5
- Freon/air condenser;
6
- Freon/air exhaust condenser;
7 - Room delivery fan;
8
- Ejection fan;
9
- Electric board
10
- Room air recirculation damper;
11
- Exchange air vacuum damper;
12
- Foul air vacuum damper;
13
- Auxiliary air vacuum damper;
14 – Recuperator bypass damper.
AERAULIC OPERATION
The air flow rates treated by the machine can be set through the control panel. The fans automatically
reach the speed required to overcome the duct losses of pressure
There can be two air flows inside the unit: the exchange air flow with heat recovery through the counter-
current air/air recuperator (1) and the room air recirculation flow.
The exchange and recirculation flows can be either combined or kept separate based on the flow rates
and the type of treatment desired for the inflow air.
The unit also includes a duct controlled by a motorized damper to vacuum the external air without passing
through the recuperator. This enables to exploit, when available, the free-cooling shares of external air.
The bypass turns on automatically when the corresponding signal activates and the external temperature
is within the setting limits.
The following air treatments are available:
-
air exchange with high efficiency heat recovery, optional winter heating or summer cooling;
-
free-cooling air exchange, that is with no heat recovery, both in summer and winter;
-
air recirculation in winter with optional heating;
-
summer air recirculation with cooling, dehumidification or cooling and dehumidification;
-
air recirculation with an exchange share, in addition to all the treatments provided for
recirculation.
The air flows can be set on the following values:
-
inflow air, flow rate adjustable between 220 m3/h and 360 m3/h;
-
exchange air, flow rate adjustable between 90 and 220 m3/h.
-
free-cooling, exchange flow rate adjustable between 90 and 220 m3/h.
