6
GENERAL FEATURES
External structure
. Basement, supporting structure and lateral
panels are made of galvanized and painted sheet-steel (colour
RAL 7035) to guarantee good resistance to atmospheric agents.
Accessibility to internal parts is possible removing the frontal
panel. For extraordinary manteinances also the rear panel can
be removed.
Refrigerant circuit .
It is contained inside a compartment
separated from the air flow to simplify maintenance and control
operations.
The hermetic rotary or scroll (according to the model)
compressor
(1) is mounted on damper supports and is protected
against overtemperatures and overcurrents. It 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 differential pressure switch that detects whatever water flow
lack.
The
source side heat exchanger
(3) is a finned coil realized with
grooved copper pipes and aluminium fins with notched profile to
increase the heat exchange coefficient. A tray is obtained in the
basement to collect the condensate generated in heating mode.
The
expansion device
(4), a thermostatic expansion valve with
external equalizer, 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) 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,
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 thermostatic
expansion valve upstream pressure).
The axial
fans
(8) are contained in a sheet nozzle and are
equipped with a safety grille.
Hydraulic circuit .
All the pipes are thermally insulated to avoid
condensate generation and minimize thermal losses. The circuit
can be equipped with a standard, a high head or a high efficiency
circulation pump (option). In that case the circuit is also equipped
with expansion vessel 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
