The second four way reversing valve is arranged in the refrigerant circuit to connect {HEAD ~ some} of {TAIL ~ heat transfer circuits} connected in parallel in each coil when it is used as an evaporator, to the suction line of the compressor 
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The second four way reversing valve is arranged in the refrigerant circuit to connect { HEAD ~ some } of { TAIL ~ heat transfer circuits } connected in parallel in each coil when it is used as an evaporator , to the suction line of the compressor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH