Ferroli HXA SERIES, Technical Manual

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GENERAL FEATURES
Description of components
External structure. Basement, supporting structure and late-
ral panels are made of galvanized and painted sheet-steel
(colour RAL 7035) to guarantee good resistance to atmo-
spheric agents. Accessibility to internal parts is possible remo-
ving 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 con-
trol operations.
The hermetic rotary or scroll (according to the model)
com-
pressor (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 compres-
sor turns off, to keep the compressor crankcase oil tempera-
ture high enough to prevent migration of the refrigerant during
winter stops and to evaporate any liquid present in the crank-
case, 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, al lows the unit to adjust itself to the dif-
ferent operating conditions keeping steady the set superhea-
ting.
The refrigerant circuit of each unit contains moreover solid
core hermetic filter dryer (5) to restrain impurity and moistu-
re residuals that could be present in the circuit, high and low
pressure switches in order to assure the compressor to ope-
rate 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 refri-
gerant (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 or a high head cir-
culation pump (option). In that case the circuit is also equip-
ped 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 con-
nected. 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 sen-
sor , to be installed outside, in order to realize the climatic con-
trol.
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