Adding Oil - Rivacold FS Serie Manual De Uso Y Mantenimiento

7.
Drill a hole for the micro-door cable and the temperature and defrost end probes. Please Note: these cables must be far away
from the electrical current cable in order to avoid signal disturbances.
INSTALLING THE EVAPORATOR
See Figure 4 and the technical specifications in Chapter 9 - Attachments.
REFRIGERATOR CONNECTION
To perform this connection, prepare the piping for the liquid and suction line according to the diameters of the attachments on the
machine.
The recommended diameters are valid up to a maximum length of 10 meters. For greater lengths, change the diameters in order to
ensure the correct gas speed.
The piping must be fastened to the walls near the curves, the welds, and every 1.5 – 2 meters in straight runs.
Figure 5 - Condenser-evaporator positioning method.
set
on
off
INSULATING THE SUCTION LINE
When the evaporation temperature is less than -10 °C, the suction lines must be insulated with an anti-condensation pipe having a
thickness of at least 13 mm in order to limit overheating.
OIL RETURN
All the systems must be designed in order to ensure oil return to the compressor. In the situation shown in Figure 5, with the
condensing unit positioned above the evaporator, it is important to provide siphons on the suction line every 2 m of height difference
in order to guarantee oil return to the compressor. In any event, when there are horizontal tracts, it is important that the suction piping
has a downward slope of at least 3%, toward the compressor.

ADDING OIL

In most installations where all of the conductors do not exceed 10 meters, there is no need to add oil. Where the conductors are
oversized in comparison to normal conditions or exceed 10 meters, a small quantity of oil must be added.
VACUUM
Correct performance of the vacuum on the system is of utmost importance for proper operation of the refrigeration machine and the
duration of the compressors in order to ensure that the content of air and, above all, humidity remain below the values allowed. The
introduction of new gases has required the use of new polyester-type oils with highly hygroscopic characteristics, which demand
greater attention during performance of the vacuum. It is advisable to perform the vacuum on both sides of the circuit. At any rate, the
goal is to reach a pressure not greater than 5 Pa.
ATTENTION:
ATTENTION:
LOADING THE REFRIGERANT
After the vacuum operation, the system must be loaded with the type of refrigerant indicated on the CE tag or, alternatively, with other
allowed types. For a correct loading operation, after having performed the vacuum, we recommend pumping part of the refrigerant in
the compressors to "break the vacuum;" then, start the compressors to enable suction of the remaining part of the load.
To correctly quantify the gas load, use the gauges connected to the prepared pressure intakes; the pressures must be compatible with
the operational conditions of the machine.
ATTENTION:
In order to avoid irreparable damage to the compressors, do not start them up in empty conditions
and without the gas load.
During the vacuum and loading phase, remember to apply voltage to the solenoid valve reel on the
liquid line.
The mixtures of refrigerant gases must be loaded into the system in their liquid state. Loading
operations must only be performed by specialized technicians
set
on
off
FS Pag. 48 Rev 00 02/12
UK