20181270 CR v8-2019Page 3
What is R32?
R32 = Difluoromethane (Category A2L slightly flammable)
R32 is the main alternative to F-gas. This fluid is interesting in that its GWP (Global Warming Potential) is
just 675 T CO2 eq.
It has no effect on the ozone layer.
5 to 10 % better performing than R410A.
Less fluid required for identical power output (20 to 30 % less fluid compared to R410A).
A completely pure fluid which is easier to recycle.
A GWP of just 675 T CO2 eq.
R32 only has a flammability risk if the three conditions below are met:
Refrigerant leak + oxygen + combustion source
If the concentration level in the room remains below the lower flammable limit as per EN378 :2017.
Consequently, the installer must ensure the minimum surface areas and volumes in relation to the charge
Flammable limit by volume:
1 m³ = max. 0.307 kg of R32
By volume, the toxicity risk indicates:
1 m³ = max. 0.300 kg of R32
The sparks generated by the relays or switches on household appliances and static electricity do not
produce enough energy to ignite R32.
It is not recommended to start up an air conditioner containing R32 near to a flame.
Auto combustion is only possible from 648 °C, and there is no risk of explosion.
Implications for the installer:
Establishments open to the general public require only fluids in flammability class 1. R32 therefore
cannot currently be used in establishments open to the general public (article CH35).
Traditional dudgeon connections can be used with R32 to connect the indoor unit to the outdoor
unit.
R32 requires different tools to those for traditional R410 installations
o A pressure gauge with a dedicated R32 scale.
o An R32 fluid recovery station.
o An R32 fluid recovery vessel.
o A leak detector.
Leak test: The equipment holder has a leak test performed by an operator with a qualification
certificate.
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