the heat transfer fluid before and after the 3 way module and the flow sensor 309 allow one to measure in the thermal load captured in the heat transfer fluid pressure relief valve 311 is normally open and ensures that the heat transfer fluid is not pressurized which could damage the plate system service valves 306 and 308 are normally only used during service events a liquid to refrigerant heat exchanger 310 a allows the thermal load to be transferred from the heat transfer fluid to a refrigeration loop 316 a bypass valve 304 a allows a portion of the low temperature heat transfer fluid to bypass the 3 way conditioner this has the effect as to lower the flow rate through the 3 way conditioner and as a result the conditioner will operate at higher temperatures this in turn allows one to control the temperature of the supply air to the space one could also use a variable flow of the liquid pump 307 which will change the flow rate through the heat exchanger 310 a an optional post cooling coil element 327 ensures that the treated air temperature supplied to the space is very close to the heat transfer fluid temperature a refrigerant compressor heat pump 317 compresses a refrigerant moving in a circuit 316 the heat of compression is rejected into a refrigerant heat exchanger 310 b collected into an optional refrigerant receiver 318 and expanded in an expansion valve 315 after which it is directed to the refrigerant heat exchanger 310 a where the refrigerant picks up heat from the 3 way conditioner and is returned to the compressor 317 as can be seen in the figure the liquid circuit 313 around the regenerator 312 is very similar to that around the conditioner 301 again the.