Preparing The Refrigerant Lines - RHOSS MACROSYSTEM CCAM105 Instrucciones De Uso

II.2.4

PREPARING THE REFRIGERANT LINES

IMPORTANT!
It is most important that the refrigerant connections
are made with great care by specialised fitters.
• The execution of refrigerant lines for connection with the evaporator
section must be properly performed by the client in compliance with
current laws. It is especially advisable to refer to standard EN 378-2 and
subsequent modifications.
• The refrigerant lines for connection with the evaporating section
must be in copper piping for refrigeration systems, type DHP UNI
12735, electrolytic, mild copper, degreased, and de-oxidised. Make
sure there are no impurities or moisture inside the pipes as this is
extremely harmful for the refrigerant circuit.
• It is advisable to insulate the liquid line in cases where the external
temperature (because of solar radiation) is higher than the temperature
of the liquid itself.
• It is advisable to isolate the line to avoid burns from accidental
contact, or to avoid heating indoor areas.
• Properly size the refrigeration lines so as to obtain limited leaks and
a speed of the refrigerant liquid that guarantees carrying of the oil
• The diameters of the input/output pipes of the remote condensers
are shown in the enclosed technical data tables.
• Table 3 shows the suggested dimensions for the connecting pipes
between the remote condenser and the evaporator unit, based on the
equivalent length of the refrigeration line.
• It is advisable to install, between the evaporator and the remote
condenser, an anti-vibration device (1) and a silencer(2) so as to reduce
the transmission of noise along the ducting. (see Fig.9)
• Horizontal stretches of pipe should end up sloping gently towards
the low point (in the sense of gas flow), to favour the flow of oil. The
slope should be between 0.5% and 1%.
• In cases where the condenser is located above the compressor, the
delivery line should be formed near the compressor into a siphon which
goes down to floor level. The aim is to reduce the risk of condensed
liquid refrigerant in the compressor line returning when the unit is out of
service.
• Siphons (i.e. traps to collect the oil) must also be inserted in the
vertical stretches of the delivery line every 5 metres.
• It is advisable to insert, after previous evaluation, a non-return valve
near the condenser.
• It is advisable to install, down the line from the remote condenser, a
liquid recipient of a suitable capacity (compliant with current standards)
in the case of long length of the line (roughly more than 20 m).
• The maximum equivalent length of the refrigeration line is 30 m. For
greater lengths contact Rhoss technical service.
• The type of the refrigeration connections of the TCEE series
evaporators (if present) may either be flared with a cock, or flanged,
according to the model.
• The flared connections of the TCHE 105-140 evaporators are the
following:
Model TCHE-THHE Connections
105
115
120
125
135
140
Tab.1
diameter
Liquid mm-inch 9,52-3/8"
Gas mm-inch 12,7-1/2"
Liquid mm-inch 12,7-1/2"
Gas mm-inch 12,7-1/2"
Liquid mm-inch 15,9-5/8"
Gas mm-inch 15,9-5/8"
Liquid mm-inch 15,9-5/8"
Gas mm-inch 22,2-7/8"
Liquid mm-inch 15,9-5/8"
Gas mm-inch 22,2-7/8"
Liquid mm-inch 15,9-5/8"
Gas mm-inch 22,2-7/8"
SECTION II: INSTALLATION AND MAINTENANCE
The diameters of the flanged refrigeration connections of the TCHE
155-2130 evaporators are the following:
Model TCHE-THHE
155
165
280
2110
2130
Tab.2
TCEE units are not fitted with an solenoid valve on the liquid line. Its
installation, between the condenser and the evaporator, is to be
provided for by the installer and is suggested when the condenser is
located above evaporator unit. For this purpose it is possible to use the
provided connections in the electrical board of the TCEE evaporator
unit.
The diagram on the following page provides instructions for proper
connection between the remote condenser and the evaporator section.
27
Connections diameter
Liquid mm 22
Gas mm 28
Liquid mm 22
Gas mm 28
Liquid mm 22
Gas mm 35
Liquid mm 22
Gas mm 35
Liquid mm 22
Gas mm 35