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5 SAFETY REGULATIONS
5.5
General information and properties of the R32 refrigerant
This chapter contains general information on the correct handling of units containing flammable fluid R32, with reference to European regulations and
directives. National laws and local building codes of each country shall in any case always be respected and applied with priority.
The air source unit discussed is the heat pump.
The following information helps the installer to operate in a proper and safe way but cannot replace a comprehensive risk assessment for the installation
of the unit. Risk assessment is necessary to determine if there is a direct risk of injury or damage to property in relation to hazards identified at the
installation site.
Commissioning, start-up, service, decommissioning and other operations on the unit shall be undertaken by trained and fully qualified personnel, in
accordance with applicable local standards and codes of practice.
Cylinders and equipment containing R32 refrigerant require compliance with proper storage and handling procedures in accordance with EN 378-3:2021.
Any person operating on the refrigeration circuit must have complete knowledge of the flammable refrigerants and the related risks.
The R32 refrigerant is classified as mildly flammable and non-toxic (A2L according to ISO/ASHRAE). Mildly flammable means that, under the three
conditions shown below, there is a possibility the refrigerant could slowly burn. Removing one of the three conditions does not pose the danger of fire,
and can therefore be considered safe.
In any case, most refrigerants emit a toxic gas when a naked flame comes into contact with them.
All flammable refrigerants (class A2L and above) will not ignite if the concentration level stays below the lower flammability limit (LFL).
The flammability risk of MEHITS units with R32 refrigerant is minimal. However, a site risk analysis may need to be carried out depending on the local
regulations.
Some of the properties of R32 refrigerant are listed below:
ASHRAE/ ISO817 Name
PED Group
ASHRAE Safety Classification
ODP (Ozone Depletion Potential) (R11 = 1)
GWP (Global Warming Potential) AR5 (AR4) (CO2 = 1)
Saturated Liquid Temperature(1) @ 1 atm
Practical Limit (kg/m3)
Lower between acute toxicity exposure limit (ATEL)
or oxygen deprivation limit (ODL) (kg/m3)
LFL (Lower Flammability Limit) @ 23 °C, 50% RH (% v/v)
LFL (kg/m3)
UFL (Upper Flammability Limit) @ 23 °C, 50% RH (% v/v)
UFL (kg/m3)
Density (1) @ 21 °C, 1atm (kg/m3)
Burning rate (cm/s)
Minimum ignition energy (mJ) (ASTM E582-13)
Molecular mass
Auto-ignition temperature (°C) (ASTM E659-15)
Surface switching on temperature (°C) (ASTM E659-18)
Installation, use and maintenance manual - Original instructions
The leak detector supplied on request with the unit cannot be considered a safety device.
It is to be used only as a means of testing for leaks.
B
Concentration
WARNING
A
Ignition
Leakage
C
Source of
ignition
R32
1
A2L
0
677 (675)
-51.65
0061
0.30
14.4
0307
29.3
0559
2.13
6.7
30-100
52
648
>800
EN
86
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