Profroid MiniCO2OLcompact Notice D'instructions page 57

3.2 LAYOUT RECOMMENDATIONS
The rack is mounted on 4 to 6 anti-vibration mounts depending on the models. It must be properly levelled to ensure full efficiency of
those mounts, avoid oil or liquid accumulation at low level, and avoid vibrations.
Keep a safe area around the machine in order to have easy servicing.
Keep a safe area for electrical box door opening.
The anti-vibration mounts are not height adjustable.
The rack must be installed and levelled on a flat ground (to be checked during installation) and installed on water free area / room.
Particular case of racks installed in indoor or outdoor housing: the rack is mounted without anti-vibration mounts on the main frame.
3.3 CONNECTIONS TO THE REFRIGERATION NETWORK
Important:
Due to electronics devices inside the electrical cabinet, no electrical welding must be done when the equipment is powered: risk of
electronic components destruction.
3.3.1 Piping network
Before any operation on the refrigeration unit, please remove the nitrogen holding charge.
Indeed, the equipments are delivered with a nitrogen holding charge that must be evacuated before any operation.
In order to remove totally the holding charge and remove humidity of the circuit, it is necessary to vacuum and the complete installation
below 5mbar at 5°C ambient according to the water saturation tables and EN378 standard requirements.
Piping could be from different types and thickness, according to the service pressure of the installation: copper pipes for area with service
pressure below or equal to 45 bar, and copper alloy (CuFe2P) for high pressure sides above 45 bar up to 120 bar.
These pipes must be regularly inspected according to standards, states of the art, and local regulations applicable.
All pipes must be correctly fixed and secured, without adding any constraints onto the rack headers.
It is the responsibility of the installer to protect (by installing valves, purge valves, relief valves, etc...) the piping networks of its
own supply.
The sizing of the suction pipes MT and LT and liquid pipes must be done based upon a liquid temperature of 1°C.
Transcritical equipments using CO2 are running with pressure values much higher than conventional equipment using HFC refrigerants.
Suction connection on the LT side (PS 30 Bar standard, test pressure 33 Bar).
The diameters of these pipes must be determined to ensure correct oil return and not based on the diameter of the suction valves of
the rack.
The slope of the pipes must always be in the direction of the refrigeration unit, never of back slope.
Suction connection on the MT side (PS 45 Bar standard, test pressure 49.5 Bar).
The diameters of these pipes must be determined to ensure correct oil return and not based on the diameter of the suction valves of
the rack.
The slope of the pipes must always be in the direction of the refrigeration unit, never of back slope.
Discharge connection (PS 120 Bar, test pressure 132 Bar).
Same remarks as above regarding its dimensioning and the counter-slopes (in the direction of the Gas Cooler)
The connection to the unit is made of copper alloy (Cu2FeP) but can be made of stainless steel 304L.
Connection to the gas cooler return line (PS 120 Bar, test pressure 132 Bar).
This pipework must ensure a gravity flow of the liquid at the outlet of the gas cooler to avoid the gas cooler to get overfilled
with liquid during subcritical operation. It must be sized for transcritical operation.
Connection on liquid line (PS 45 Bar standard, test pressure 49.5 Bar).
To be connected downstream the liquid station (valves + by-pass + sight glass + filter drier).
Important notice: the sizing of the pipes which are external to the rack is the responsibility of the installer depending on the application
The shut-off valves are "locked" valves (diameters depending on the size of the rack).
and the configuration of the installation
.