Hiflex
2 All Versions
English
2 - Configuration
Here is a short description of the peculiar features of each of the six available versions.
2.1 - Version A
Direct expansion air-condensed units
Refrigerating circuit
The 4-6-8 models are provided with a
single refrigerating circuit, the units
5-7-9 have two refrigerating circuits. The
refrigerating circuit includes the compres
sor and the thermal expansion valve with an
external equalizer (or in the M version, the
cappilary) controlling the refrigerant flow to
the evaporator so as to keep a steady over
heating degree. Before the thermal expan
sion valve there is a sight glass enabling
the visual check of the refrigerant charge. A
dryer filter is installed in the liquid line for
better cleaning and less humidity in the cir
cuit. The welded steel liquid receiver is
available in the refrigerating circuit to en
able the constant and even refrigerant flow
to the expansion valve. On-off valves are
installed as standard to help the extraordi
nary maintenance of the circuits.
For a safe operation, during the start-up it
is advisable to install the non-return valve
(supplied as optional on request) on the
connection of the refrigerant with the exter
nal condenser to protect the compressor
from unexpected refrigerant migrations
(see installation diagramme). A suitably sized safety valve is installed on the liquid receiver; the valve is
equipped with flanged connections to allow the refrigerant to be discharged outside through suitable
pipes. All low temperature parts of the refrigerating circuit are insulated. The refrigerating circuit is also
provided with a high pressure switch and a low pressure switch. The low pressure switch has automatic
resetting, whereas - for safety reasons due to possible high pressure in the compressor - the high pres
sure switch has manual resetting. The pressure switch calibration values are shown in the installation
manual supplied with the machine.
The units are supplied without the external condenser and with nitrogen-pressed refrigerating circuit. The
customer himself has to make the connection with the external condenser and the refrigerant charging.
All the instructions for the necessary operations are contained in the installation manual.
External condensing unit
The units are coupled with the air condensers of Liebert HIROSS wide range in the versions with stan
dard axial fans and with low noise axial fans.For technical data and performances refer to the relevant tech
nical documentation.The following paragraphs describe the suggested couplings for the HIFLEX units as
a function of the outdoor air temperature. The data given below are approximate and must always be veri
fied on the basis of the specific performances and working conditions required.
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