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In units charged with R32 gas, it is mandatory to remote the drainage of the safety valves to move gas exhaust away in case of tripping of the overpres-
sure valves. The pipes to be remoted to drain the safety valves must have a cross-section and length compliant with national laws and European direc-
tives.
The safety valve models used depend on the size of the machines. The following are the features of the safety valves used:
High pressure valve (*)
Sizes
Number
1
2160-2180
2
4180÷4240
2
4280-4350
Note: The number of valves doubles in the case of accessory DVS – double safety valve.
Note: Accessory GM - Pressure gauges (***).
Note: The leak detector (LKD option) or the LKDP accessory should only be used for checking refrigerant leakage from the unit. It must not be
regarded, in any way whatsoever, as a safety component.
In case of breakage, the evaporator/recovery unit could release refrigerant into the hydraulic circuits. It is the responsibility of the installer to design and
protect the hydraulic circuits using safety valves that must be placed in an area away from possible sources of ignition.
2.4.3. INSTALLATION
EQRU-EQRHU - EQRUSS-EQRHUSS units contain R32 gas, classified in safety group A2L according to EN378-1, annex E, therefore flammable. For ma-
chines operating with R32 refrigerant, a risk assessment has been carried out and appropriate risk mitigation measures have been adopted. In any case
the unit is not suitable for installation in classified explosion risk areas.
The person in charge of the system must perform a risk assessment after installation of the unit considering the adjacent danger zones and generated by
the unit. The risk assessment must include the analysis of any ignition sources in proximity of the unit. The risk assessment and consequent mitigation
measures must be executed and applied throughout the entire lifetime of the unit, including transport, storage, installation, operation, maintenance and
final disposal. The refrigerant gas is pressurised inside the unit even when not operating and completely disconnected. A possible leak would release its
entire content into the environment. All personnel needing to operate nearby or on the unit must be appropriately trained to work in safety. In order to
reduce the risk, it is mandatory to follow the instructions given in the following paragraphs regarding the routing of safety valves. The discharge of safety
valves must be routed outside in free air free from sources of ignition and never in a confined space.
The safety valves are sized so as to allow them to be connected to an exhaust pipe section downstream. The diameter, length and number of elbows of
the downstream pipe section of the safety valves must be chosen so that pressure drops in that section do not exceed the design values. The diameter of
the downstream pipe of the valve must be sized according to the constraints in the table below. The table displays the minimum diameter of the pipe de-
pending on its length, number of elbows and type of valve installed in the unit
Minimum inside diameter in mm
D7/CS
3
6
10
D10/CS
3
6
10
IOM_EQRU-SS_EQRHU-SS_2160a4350_208676_230601_ES-EN-FR-DE-IT
78
Outlet diameter Tripping pressure
1" GM
48 bar
3/4" GM
48 bar
1" GM
48 bar
Lenght [m]
3
22
23
24
Lenght [m]
3
29
31
33
Low pressure valve (**)
Sizes
Number
1
2160-2180
2
4180÷4350
5
10
24
27
24
27
25
28
5
10
32
36
33
37
35
38
EQRU-EQRUSS
EQRHU-EQRHUSS
Outlet diameter Tripping pressure
1/2" GM
30,4 bar
1/2" GM
30,4 bar
30
33
33
33
30
44
44
45
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