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2 GENERAL INFORMATION
2.1
Unit Description
This series of air to water S-ASX heat pumps satisfies the heating and domestic hot water production
requirements of installations of medium and large size. The possibility to produce up to 65c temperatures makes these
units particularly suitable to radiators circuits as well as to fan coil and under floor heating circuits. All the units are
suitable for outdoor installation.
The refrigerant circuit, contained in a box separate from the air flow to simplify the maintenance operations, is
equipped with two scroll compressors mounted on damper supports, brazed plate heat exchangers, electronic
expansion valve, reverse cycle valve, axial fans, finned coil realized with copper pipes and aluminium fins. The circuit is
protected by high and low pressure switches and flow switches on the plate heat exchanger.
The compressors are arranged in tandem on a single refrigerant circuit and allow the capacity modulation
according to the plant requests to guarantee a high seasonal efficiency. Both the compressors are equipped with
vapour and liquid injection and are placed on an economized refrigerant circuit with plate heat exchanger and
electronic expansion valve dedicated to the injection.
The plate heat exchanger and all the hydraulic pipes are thermally insulated to avoid condensate
generation and reduce thermal losses.
The axial fans, equipped with electronic control of the rotational speed, guarantee high efficiencies in all the
operating conditions and the possibility to reduce the noise level during the night.
All the units are provided with a phase sequence and correct sequence controller device and with an outdoor
temperature sensor to realize the climatic control. All the units are accurately built and individually tested in the
factory. Only electric and hydraulic connections are required for installation.
2.2
Description of Components
External Structure:
Basement, supporting structure and lateral panels are made of galvanized and painted sheet
steel to guarantee good resistance to atmospheric agents. Accessibility to internal parts is possible removing the
frontal and lateral panels. For maintenance also the other panels can be removed.
Refrigerant Circuit:
It is contained inside a compartment separated from the air flow to simplify maintenance and
control operations.
The Scroll Compressors (1)
: Are mounted on damper supports and are protected against over temperatures and
overcurrent’s. Each compressor is equipped with an electrical heater, that is activated when the compressor turns off,
to keep the compressor crankcase oil temperature high enough to prevent migration of the refrigerant during winter
stops and to evaporate any liquid present in the crankcase, in order to prevent possible liquid rushes on starting. Both
the compressors are equipped with vapour and liquid injection and are placed on an economized refrigerant circuit
with plate heat exchanger and electronic expansion valve dedicated to the injection.
The Plant Side Heat Exchanger (2):
Is a brazed stainless steel plate heat exchanger, properly insulated to avoid
condensate generation and to minimize thermal losses and protected by a flow switch that detects lack of water flow.
The Source Side Heat Exchanger (3):
Is a finned coil realized with grooved copper pipes and aluminium fins with
waved profile to increase the heat exchange coefficient. A tray is placed under the coil to collect the condensate
generated in heating mode.
The Expansion Device (4):
An electronic expansion valve, allows the unit to adjust itself to the different operating
conditions keeping steady for heating.
The Filter Dryer (5):
The refrigerant circuit of each unit contains a filter to restrain impurity and moisture residuals that
could be present in the circuit, high and low pressure switches in order to assure the compressor to operate inside the
permitted limits.
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