6
GENERAL FEATURES
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 extraordinary manteinances 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 overtemperatures and overcurrents.
Each compressor is equipped with an electrcal 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.
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 whatever water flow lack.
The
source side heat exchanger (3)
is a finned coil realized
with grooved copper pipes and hydrophilic 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 the set superheating.
The refrigerant circuit of each unit contains moreover solid
core hermetic
filter dryer (5) t
o 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,
4 way reverse cycle valve
(6)
to allow operating mode change reversing the refrigerant
flow,
liquid receiver (7)
to compensate the different refrigerant
charge required in heating and in cooling mode and pressure
connections SAE 5/16” - UNF 1/2” - 20 equipped with pin, gasket
and blind nut, as required for the use of R410A refrigerant (they
allow the complete check of the refrigerant circuit: compressor
inlet pressure, compressor outlet pressure and expansion valve
upstream pressure). All the pipes of the refrigerant circuit are
properly insulated to avoid condensate generation and minimize
thermal losses.
The
plug fans (8)
are equipped with an high efficiency
electronically commutated (EC) motor and guarantee enough
available static pressure to allow the indoor ducted installation
besides high efficiencies in all the operating conditions.
Hydraulic circuit .
All the pipes are thermally insulated to avoid
condensate generation and minimize thermal losses. The circuit
can be equipped with a standard, high head or modulating
circulation pump (option). The circuit is always equipped also
with expansion vessel, safety valve and air vents.
Electrical panel .
It contains all the power, control and security
components necessary to guarantee the unit to work properly.
The unit is managed by a
microprocessor controller
to which
all the electrical loads and the control devices are connected.
The user interface, to be placed indoor, allows to view and to
modify, if necessary, all the parameters of the unit.
All the units are supplied with an
outdoor temperature sensor,
to be installed outside, in order to realize the climatic control.
Description of components
4
6
3
8
1
2
7
