EN
OEM Manual – CUBO
2
AQUA
UMT/WG T MT Rev3.0 – 08/10/2021
Pag. 11-EN
11
7
Commissioning
The unit leaves the factory without being filled with refrigerant.
The compressor and receiver are pre-charged with oil.
The customer is responsible for charging the system with CO2 and adding more oil (only if strictly
necessary).
The instruction given herein are a reminder of the best method to protect the unit, which could be seriously
damaged in the event it is not filled correctly.
7.1
Evacuation and pre-charge
EEVMAG0000
Before starting the vacuum procedure, it is necessary to open the high
pressure valve (HPV) and the compressor equalization valves.
To open the valves a software based function (VACUUM) is available
in the Cubo2 AQUA SW (find below some details).
As an alternative you can open the valves manually. HPV valve can be
opened with the Carel magnetic tools supplied with unit. (See photo on
side). The magnet opening & closing direction is marked on the top –
Clockwise to Open.
Evacuate the system from both the high and low side condensing unit
service connections.
Stop the Vacuum procedure only when the “standing vacuum pressure”
reach a value of 0.67mbar. During the vacuum process brake the vacuum
several time with dry nitrogen.
Before starting refrigerant charge, break vacuum WITH ONLY CO2
VAPOUR (all parts of circuit) up to 10bar pressure to avoid dry-ice
production.
Do not switch on the compressor during this phase!
7.1.1
“VACUUM”, SW function details
This function can be activated only while the unit is in OFF (regulation OFF) and the target is to
automatically open HPV and Compressors equalization solenoid valves.
1
Main menu – Inputs & outputs
2
Manual Management
3
Vacuum
4
Select “YES” – This will then open HPV
and equalizaztion valve according to the
settings in mask Bbd02
5
Set the wanted valves status during the
Vacuum
O = Open / C = Close
6
The status on the front screen will now
indicate “Unit OFF by vacuum”, in this
state the CDU cannot be set in ON.
The above step should be reversed prior
to charging the unit
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