FLAMMABLE GASES
e-BALTIC-IOM-2020.12-EN
14
SAFETY AREA
The product is hermetically sealed and bears the CE mark. As such, it is for France exempted from the measures described in
§ 3 of CH35 in the context of normal operation.
A formalized periodic inspection of the product's hermeticity will guarantee the preservation of this high level of hermeticity.
Nevertheless, in abnormal operating conditions, leaks may occur (poor maintenance, maintenance with opening of the
refrigeration circuit). For these cases, prior to placing these products on the market, we carried out studies in accordance with
standards EN 60079-10-1 and EN 378. Thus the rooftop installed according to our recommendations and well maintained does
not generate an ATEX zone.
Moreover, the product is equipped with safety devices against the risk of flammability. (see § On-board safety with R32 gas).
Please maintain the detection system and the associated control chain according to EN 60079-29-1 and EN 50495. In case of
maintenance we recommend that the operators be equipped with an explosimeter, switch off the power supply to the rooftop
and do not approach any potential source of ignition without first checking the absence of a potentially flammable area due to
an undetected leak.
The end user should update the DUER (Document Unique d'Evaluation des Risques) indicating the presence on his site of
products charged with R32 fluid, and train his personnel on the good practices to be adopted for a safe use.
For particular uses or installations that do not comply with the assumptions of clearance rate calculations according to EN
60079-10-1 (see above), please contact us if you need information to perform your own ATEX zoning calculation.
INSTALLATION ON A FLAMMABLE GAS UNIT
ATEX : It is forbidden to store and install the machine in an ATEX area.
In the immediate area of the Rooftop (proximity distance ≤ to 2m):
-
The presence, even temporary, of ignition sources is prohibited (electrical or heat sources see EN 378),
-
It is forbidden to install fresh air vents in the building or in extracts
For ducting/ducted units, ensure that no sources of ignition as defined by EN378 (e.g. electrical and heat) are installed in or
near the ducts.
Minimum building volume:
For a given volume of building to be ventilated, the standard gives a maximum load per circuit in flammable fluid A2L/A2/A3.
According to the standard, for R32 fluid, Lennox recommends a maximum load per circuit of :
If the mass of refrigerant is between 1.8 and 12kg :
m ≤ √A x h x 0.571
If the mass of refrigerant is between 12 and 60kg :
m ≤ A x h x 0.061
m: mass of refrigerant A2L (kg)
A : area of the room (in m²)
h : air supply height in the room (in m) (max: 2.2)
Example for a 2.2m high room:
D Box
E Box
E+ Box
F Box
G Box
H Box
55
65
75
85
95
115 100 120 130 150 180
210
R32 max load per circuit
6,2
6,2
5,7
5,7
7,7
7,8
7,3
7,4
11,3 11,3 12,8
13,5
A
min
24,36 24,36 20,59 20,59 37,57 38,55 33,77 34,70 80,20 80,20 95,38 100,60
