Execution, Installation And Connection Of The Refrigeration Lines; Tests And Inspection; Plant Vacuum - Olimpia splendid ALYAS E INVERTER 9 Hinweise Für Die Verwendung Und Pflege

2.6.3 - Execution, installation and connection of the refrigeration lines

Do not make the connections using normal hydraulic piping, which could contain scrap
residues, dirt or water, and which can damage the unit components and jeopardise correct
operation of the appliance.
Only use copper piping, specific for refrigeration, which is supplied clean and sealed at the
ends.
When the cuts have been made, seal the end of the roll and piece cut immediately.
Pre-insulated copper pipes can be used for refrigeration.
Only use pipes with diameters that respect the size corresponding to the unit.
Identify the route of the piping in a way to reduce the length and bends as much as possible in order to obtain
maximum system performance.

2.6.4 - Tests and inspection

After making all pipe connections, check the seal of the system.
Operate as follows:
a. Loosen the cap (20) on the gas line service fitting (figure 17).
b. Connect a tank of anhydrous nitrogen to the coupling with a 5/16" connector and a pressure reducer.
c. Open the tap on the tank and pressure reducer and bring the pressure in the circuit to 3 bar; close the
tank.
d. If after about 3 minutes the pressure does not drop, the circuit is in good working order and the pressure
can be raised to 15 bar by reopening the tank.
e. Check again after 3 minutes that the pressure remains stable at 15 bar.
f. For safety reasons apply a solution of soapy water to the connectors and check for the formation of bub-
bles revealing leakage of gas.
g. If the pressure should drop and the search on the attachments with soapy solution gives a negative
outcome, introduce R32 gas into the circuit and look for the leak using a leak detector.
Since the circuit has no welding points, the leaks should only be present in the piping joints. In this case,
tighten the nuts with greater force (figure 18), or make the attachments again with the relative flaring.
h. Repeat the seal test.

2.6.5 - Plant vacuum

When all of the tests and checks regarding perfect sealing have been performed, a vacuum must be applied
to the system to remove the impurities contained therein (air, nitrogen and humidity).
a. Use a vacuum pump with capacity of 40 l/min (0.66 l/s) and connect it to the gas line service fitting using
a flexible hose with 5/16" attachment.
b. Lower the pressure inside the circuit to the absolute value of 50 Pa for approx. 2 hours.
If, after this period of time, the pressure has not been taken to the set value (50 Pa), it means
that there is a lot of humidity in the circuit or there is a leak.
c. Maintain the vacuum pump operating for another 3 hours.
If the value still hasn't been reached after this period of time, look for the leak.
d. When the vacuum has been applied and the system has been cleaned, remove the pump fitting when
this is still running.
e. Tighten the cap (20) (figure 19).
EN - 14