13
AIR COOLED DIRECT EXPANSION UNITS (DXA)
The air cooled DX units extract heat from the room and transfer it to
the outside using air cooled refrigerant heat exchangers (condensers).
The room unit and external condenser form an autonomous sealed circuit
once installed. The UNIFLAIR remote condensers used with LEONARDO
units include a precise electronic system to regulate the fan speed to
ensure trouble-free operation throughout the year under a wide range of
external air temperatures. Special attention has been paid to the acoustic
design of the condensers to minimise noise levels. A wide range of
combinations is available to meet different site requirements.
WATER COOLED DIRECT EXPANSION UNITS (DXW)
In the DX water cooled units, the heat extracted from the room is
transferred to water via a stainless steel brazed plate exchanger within
the unit.
The cooling water may be fed from the mains supply, a cooling tower or
a well (open circuit), or recycled in a closed loop cooled by external
coolers.
In the latter case, an anti-freeze mixture of water and ethylene glycol is
normally used.
The water cooled units have the advantage that the refrigerant circuits
are charged and sealed in the factory. This makes installation extremely
simple, eliminating the need for any site-installed refrigerant pipework.
CHILLED WATER DIRECT EXPANSION UNITS WITH EC BACKWARD CURVED BLADE FANS
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Operating description
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4
