detecting a temperature of {HEAD ~ said refrigerant} at {TAIL ~ a refrigerant flow passage} where the refrigerant passes; and 
at
detecting a temperature of { HEAD ~ said refrigerant } at { TAIL ~ a refrigerant flow passage } where the refrigerant passes ; and
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH