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INSTALLATION OPERATIONS AND MAINTENANCE MANUAL - RXC/Hi SERIES
2. TECHNICAL CHARACTERISTICS
2.1 Introduction
Any occupied room requires the correct supply of fresh air and at the same time the control of the internal thermo-hygrometric
conditions. Through the recovery of energy from the air extracted from the room, through the use of systems with integrated
heat pump technology, we offer a highly efficient solution to meet the needs of thermo-hygrometric well-being and air
exchange in civil and tertiary air conditioning systems such as offices, bars, restaurants, etc., both in summer and winter and
without additional charges in the management of primary air.
These units are particularly efficient since they use a high efficiency plate heat recovery, combined with a cooling circuit
in heat pump operating with inverter compressor. The use of the high-efficiency plate heat recovery makes it possible to
significantly reduce the period of use of the cooling circuit during the year, thus reducing its use to short periods, thus limiting
electricity consumption to a minimum.
The compact dimensions of the units allow for easy installation even in false ceilings while maintaining excellent accessibi-lity
for the maintenance of all internal components. The numerous accessories available on request complete the functions of
the unit, which generally has to be combined with an air conditioning system.
The units are available in 5 sizes, with nominal air flow rates from 500 to 3500 m
3
/h.
The units in
H1
,
H2
,
H3
,
H4
configurations have been designed for false ceiling installation.
2.2 Structure
Structure in RAL 9010 steel profiles, pre-painted at 180°C with polyurethane powder paint and 25 mm thick panels.
Sheets with 6/10" thickness covered with protective film, in galvanized steel.
The internal insulation is made of high density polyurethane foam (40 kg/m
3
) or mineral wool (90 kg/m
3
). The frame is made
according to EN1886 standard, class D1 mechanical resistance, class T3 thermal transmittance, air tightness class L1, thermal
break factor TB3.
The air tightness is guaranteed by a particularly adaptable and resilient neoprene gasket, the tightening of the opening panels
is made by means of push screws that ensure an adequate and constant pressure on the gaskets.
In all areas subject to condensation there is a condensation tray in AISI 304 stainless steel, inclined internally and in
compliance with EN 1.4301.
2.3 Heat recovery
(1° recovery stage)
The units are equipped with an aluminium counter-flow heat exchanger used to transfer heat from the exhaust air to the
incoming fresh air. The heat exchange takes place in counter-flow with efficiencies higher than 85%. The spacing between
the fins is optimized in order to reduce air side pressure drop and fan power consumption. In some conditions of low fresh
air temperature and high humidity, the exchanger may start to frost. Through the integrated control system it is possible
to manage the defrosting of the exchanger. The heat recovery is also equipped with an additional by-pass damper for the
management of the free-cooling and free-heating mode.
2.4 Refrigerant circuit in heat pump
(2° recovery stage)
The efficiency of the unit is further increased thanks to a second phase of indirect recovery, obtained through a heat pump
refrigeration circuit compression system. The cooling circuit is equipped with a rotary or Scroll compressor with inverter,
with continuous capacity regulation. The compressor is complete with thermal protection, crankcase heater, low and high
pressure switches and vibration isolators suitable to isolate vibrations.
The refrigerant circuit is of direct expansion type loaded with R32 refrigerant. Each refrigerant circuit is factory tested both
in terms of tightness (pressure test) and functionality. The main components are: finned pack heat exchangers and source,
electronic expansion devices, solid-cartridge anti- acid filters, safety pressure switches on high and low refrigerant pressure
side, receiver and liquid separator on suction side, liquid / humidity sight glass, cycle reversal valve, non-return valves, safety
valves on high pressure side. The circuit is complete with reverse cycle defrosting system and a fresh air by-pass.
