Refrigerant - Genetron® 402A

honeywell Genetron® 402A (HP80) is an alternative retrofit refrigerant designed for low and medium-temperature refrigeration systems that use CFC-502. Applications where Genetron® 402A is a suitable retrofit refrigerant include supermarket freezer cases; reach in coolers, display cases and ice machines. Genetron® 402A is a ternary blend of HFC-125, HC-290, and HCFC-22. As Genetron® 402A contains a hydrochlorofluorocarbon (HCFC), a chemical controlled by law, service technicians should keep in mind that regulations restrict the use of HCFC-containing refrigerants and dictate the ultimate use of an HFC, such as Genetron® 507.

Genetron® 402A is not a "drop-in" replacement for Genetron® 502. As such, service technicians must acquaint themselves with the proper service procedures to perform each retrofit effectively. Two key points to be aware of are:

  • Mineral oils, which have been used traditionally with Genetron® 502, are much less miscible with Genetron® 402A than with Genetron® 502. Therefore, to get a better good oil return with evaporating temperature lower than -29°C, the proper lubricant to use is at least a 50% mixture of mineral oil and alkylbenzene.
  • Genetron® 402A is a blend that can segregate. For this reason it must be only liquid charged from the cylinder into the system.