Responsible Refrigeration
A2L , A2 and A3 . It is just that extra care must be taken when working on a unit using these flammable gases . In all cases the prevention and detection of gas leaks from joints and connections is important .
Full safety checks and procedures must be followed at all times and for all refrigerants , even when they are classed as low toxicity or non-flammable . For safety reasons and compliance with the PER an installer must be a registered practitioner and be competent when working with and handling flammable refrigerants .
A fire extinguisher either with dry-powder or with CO 2 must be available close to the work area . As mentioned in a previous column , there are certain factors to be considered and these are worth stating again . When doing service and repair , a two meter flame hazard zone in all directions of the outdoor condensing unit and indoor refrigeration or air conditioning unit is required . If the area is a confined space like a plant room the area must be well ventilated . These are the same procedures that apply to the common refrigerants and will still apply to the three classification levels for flammable refrigerants .
Then there is the refrigerant concentration limit ( RCL ), ( ASHRAE standard 34 – 2019 ) this limit in air is determined in accordance with this standard and intended to reduce the risks of acute toxicity , asphyxiation , and flammability hazards in normally occupied , enclosed spaces . This refers to the amount of refrigerant allowable in a space if there is leakage . With an A2L refrigerant like R32 which has a lower flammability , the concentration can be calculated .
It is advisable before starting any service , maintenance , or repair work on a unit or system an assessment should be done :
• Check what the history of servicing has been
• Check the classification of the refrigerant charge into the unit or system
• Confirm that there is no source of ignition from an electrical power tool present
• There are no flammable materials are stored close by
• Welding only takes place when all gas is recovered and with the greatest of care
• Ensure a dry-powder or with CO 2 fire extinguisher is available
• Have visible safety signage in place
• Ensure that the work area is adequately ventilated
• Ensure that a flammable refrigerant detector is present
• Always wear recommended personal protective gear ( PPE ).
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Flammable refrigerants are with us now and will become more widely used for refrigeration and air conditioning . All practitioners must be prepared and registered as competent to work with these gases . RACA
www . refrigerationandaircon . co . za RACA Journal I September 2022 45