When recovering R404A from a system after a motor burn-out, what is the most significant hazard to be aware of?

When recovering R404A from a system after a motor burn-out, the most significant hazard to be aware of is the potential for acid burns. Motor burn-out can lead to the formation of acids within the refrigerant due to the chemical breakdown of the oil and refrigerant mixture. This is particularly concerning because these acids can be corrosive and pose a health risk upon contact with skin.

During the recovery process, technicians should assume that the refrigerant may be contaminated with these harmful substances. Thus, appropriate personal protective equipment, such as gloves and face shields, is essential to prevent skin contact and, consequently, acid burns. The risk of acid burns highlights the importance of handling the recovered refrigerant with care and ensuring all safety protocols are followed to protect oneself from these toxins.

While other hazards like electric shock, refrigerant leakage, and explosion risks are valid considerations during the recovery process, the unique chemical risks posed by acids resulting from a motor burn-out make acid burns the primary concern in this specific context.