12.5 Precautions in the event of refrigerant leaks
C A U T I O N
Installers and
designers of the installations must strictly follow local and national legislation, and local codes
regarding safety requirements in the event of refrigerant leaks.
12.5.1 Maximum permissible concentration of hydrofluorocarbon (HFC)
The R410A refrigerant gas, used in the equipment, is non-flammable and non-toxic.
D A N G E R
In the
event of a leak, the gas will spread around the room, displacing the air, and could therefore result in asphyxia.
The maximum permissible concentration of HFC R410A gas in the air is 0.44 kg/m
3
, according to standard EN 378-1.
Consequently, effective measures must be adopted to maintain the concentration of R410A gas in the air below 0.44 kg/
m
3
in case of leakage.
12.5.2 Calculation of the refrigerant concentration
1 Calculate the total quantity of refrigerant R (kg) charged in the system; to do so, connect all the indoor units of the rooms
in which you need air conditioning systems.
2 Calculate the volume V (m
3
) of each room.
3 Calculate the refrigerant concentration C (kg/m
3
) of the room in accordance with the following formula:
R / V = C
R: total quantity of refrigerant charged (kg).
V: volume of the room (m
3
).
C: concentration of refrigerant (= 0.44 kg/m
3
for R410A gas).
Particularly for the SET FREE series, whose outdoor units can be connected to multiple indoor units at a distance, the
refrigerant charge is greater than for individual units.
D A N G E R
Check that the room where the indoor units will be installed can maintain the refrigerant concentration below the
lower limit established in case of leakage. Otherwise, take the necessary action to correct this situation.
12.5.3 Countermeasures in the event of refrigerant leaks
The room should have the following characteristics in case of a leak of refrigerant:
1 Opening without shutter to permit the circulation of fresh air in the room.
2 Opening without door measuring 0.15%, or greater, of the floor surface.
3 A
ventilator
with a capacity of at least 0.4 m
3
/min per refrigeration ton or greater, connected to a gas leak detector,
should be installed.
Model Ton Model Ton
RAS-8FSXN 4.11 RAS-32FSXN 12.16
RAS-10FSXN 4.11 RAS-34FSXN 12.59
RAS-12FSXN 4.11 RAS-36FSXN 13.02
RAS-14FSXN 6.08 RAS-38FSXN 14.30
RAS-16FSXN 6.08 RAS-40FSXN 14.30
RAS-18FSXN 6.51 RAS-42FSXN 14.73
RAS-20FSXN 8.22 RAS-44FSXN 16.70
RAS-22FSXN 10.19 RAS-46FSXN 16.70
RAS-24FSXN 10.19 RAS-48FSXN 17.13
12 Maintenance notes
352
SMGB0065 rev. 1 - 12/2010
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