The second reversing four way valve is mounted in the refrigerant circuit either to connect selectively the outlet of one coil used as a condenser to the expansion means associated with the other or evaporator coil or to connect {HEAD ~ some circuits} arranged in {TAIL ~ a parallel} in the coil used as an evaporator to a suction line of the compressor 
The second reversing four way valve is mounted in the refrigerant circuit either to connect selectively the outlet of one coil used as a condenser to the expansion means associated with the other or evaporator coil or to connect { HEAD ~ some circuits } arranged in { TAIL ~ a parallel } in the coil used as an evaporator to a suction line of the compressor
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