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3. TECHNICAL CHARACTERISTICS
3.1 Unit description
The dehumidifiers are built vertically, equipped with robust galvanised steel frame, properly designed to operate in combination with radiant cooling sy-
stems. The units have been designed both to ensure the dehumidification of the air under conditions of air thermally neutral, ie at the same temperature
at which they levy it, both in conditions of cooled air, managing very small air flow thus avoiding uncomfortable drafts typical of traditional air conditioning.
The units, can operate even without pre and post cooling coils, this option could be very useful in middle seasons when it is necessary to dry but the air
conditioning system is not in operation.
All units are fully in compliance with the European norms and provided with CE marks and dedicated conformity certificate.
3.1.1 Frame
All units are made from hot-galvanised thick sheet metal, to ensure the best resistance against the corrosions. The cabinet frame is made by removable
panels to allow an easy inspection and internal maintenance. The condensing drip tray is supply as standrad in all models and it is made in plastic material.
3.1.2 Refrigerant Circuit
The refrigerant circuit is made by using international primary brands components and according to ISO 97/23 concerning welding procedu-
res. The refrigerant gas used in these units is R134a. The refrigerant circuit includes: filter drier, capillary expansion device, Schrader valves
for maintenance and control, pressure safety device (according to PED regulation).
3.1.3 Compressor
The compressor is reciprocating type, equipped with crankcase heater and thermal overload protection by a klixon embedded in the motor
winding. It's mounted on rubber vibration dampers and, by request, it can be supplied with some jackets to reduce the noise (accessory).
3.1.4 Condensers and Evaporators
The condensers and evaporators are made of copper pipes and aluminium fins. The diameter of the copper pipes is 3/8" and the thickness
of the aluminium fins is 0,1 mm.The tubes are mechanically expanded into the aluminium fins to improve the heat exchange factor. The
geometry of these condensers guarantees a low air side pressure drop and then the use of low rotation (and low noise emission) fans.
All the units have a stainless steel drip tray and use a third brazed plate heat exchanger made of stainless steel AISI 316 as condenser in
cooling mode.
3.1.5 Pre and post cold water coils
The pre and post cold water coils are made of copper pipes and aluminium fins. The diameter of the copper pipes is 3/8" and the thickness
of the aluminium fins is 0,1 mm. The tubes are mechanically expanded into the aluminium fins to improve the heat exchange factor. The
pre-cooling coil is used to increase the dehumidification capacity of the unit, while the post-cooling coil is used to keep the outlet air tem-
perature at the same inlet value.
3.1.6 Water condenser
Type-brazed plate, made of stainless steel AISI 316; The water condenser is used as cooling integration.
3.1.7 Supply fan
The supply fan is centrifugal type, double inlet with forwards blades, dynamically and statically balanced and directly connected to a 3 speed
fan motor. Installed into the unit by interposed ant-vibration kit.
3.1.8 Air Filter
It's supplied standard with the unit and it's built in nylon. It can be removed for differential disposal, class G2, according to EN 779:2002.
3.1.9 Microprocessor
All units are equipped with a microprocessor for controlling the timing of the compressor, defrosting cycles and alarms. A special card with light signals
indicates the presence of the supply voltage, the activation of defrosting cycle or the presence of an alarm.
3.1.10 Electric box
The electric switch board is made according to electromagnetic compatibility norms CEE 73/23 and 89/336. The accessibility to the board is possible after
removing the front panel of the unit. Ready for the connection to the power and to the consensus control, The terminal board is also supplied with voltage
free contacts for remote ON-OFF. The terminal block is also arranged with two (2) free contacts to allow operation in ventilation mode only (the 1st) in
cooling mode operation the 2nd. Closing the first contact, it will be enabled for operation in fan only while the dehumidification function will be disabled.
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