for such refrigerants and is within regulatory requirements for example the refrigeration loop 110 has a refrigerant charge limit of no more than 150 grams of hydrocarbon refrigerant such as propane it should be appreciated that the term u201c hydrocarbon refrigerant u201d used herein may include other classifications of flammable or toxic refrigerants including a2l rated refrigerants other refrigerants may have alternative refrigerant charge limit regulations for example an a2l rated refrigerant has a charge limit of 500 grams with continued reference to fig2 the refrigeration system 100 also includes a second circuit or fluid loop or low side loop 120 referred to as the u201c low side loop 120 u201d for purposes of description only the low side loop 120 may be a low side chilled fluid loop that provides a chilled fluid to refrigerate or otherwise maintain a desired temperature of the merchandiser 10 the chilled fluid can include hydrofluoroether hfe or another chilled fluid suitable for providing refrigeration to the merchandiser 10 the low side loop 120 includes the chiller 119 a pump 122 and a heat exchanger 126 the pump 122 is in fluid communication with the chiller 119 via loop piping 124 the piping 124 also fluidly connects the chiller 119 to the heat exchanger 126 and the heat exchanger 126 to the chiller 119 to form the loop 120 as illustrated the heat exchanger 126 defines an evaporator of.