Sabiana ENY-SP-180, Техническое руководство

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Energy Smart |
FREE-COOLING AND FREE-HEATING MANAGEMENT
All the ENERGY SMART vertical units and the ENY-SHP-170 and ENY-SHP-270 horizontal size are equipped with a heat
recovery by-pass function, when it is beneficial to use the fresh air free-cooling (or free-heating) function.
The following setpoint temperatures must be set:
Internal heating system setpoint
• t
heating
, usually set at 20 °C
Internal cooling system setpoint
• t
cooling
, usually set at 26 °C
The temperatures entered must be determined by the installer in accordance with the Heating/Cooling system provided
in the unit installation room.
Other temperatures are also defined:
• Ti, i.e. the internal temperature
• TAE, i.e. the external temperature
The following operating modes of the bypass damper (free heating/free cooling) are available:
t
cooling
t
heating
COOL
RECOVERY
HEAT
RECOVERY
FREE-HEATING
MODE
FREE-COOLING
MODE
Ti [°C]
TAE [C°]
35
30
25
20
15
10
10 15 20 25 30 35
26
If a geothermal water resource is available, a Dip Switch configuration can be used to control an on-off valve of a geothermal
water coil, supplied by a third party and installed in a fresh air pre-treatment position. The geothermal water coil can be used in
summer for pre-cooling fresh air, thus enhancing the standard free-cooling mode.
In fact, thanks to the pre-treatment, the cooled fresh air can be used in free-cooling mode even in warmer outdoor conditions
than those normally used to operate by-pass dampers. In winter, the geothermal coil can be used as a hydronic antifreeze
system, which ensures considerable energy savings compared to electrical systems.
Instead for the size ENY-SHP-150 the free-cooling is a manual function, that can be activated only with the optional accessory
T-EP. For this size this function works only for the activation of supply air flow and for the deactivation of the extract air flow. In
the free-cooling mode it is advisable to open a roof window in a living room.