In {TAIL ~ a cooling mode} of operation {HEAD ~ the high pressure discharge gas} is routed through ports 21 and 22 of four way valve 16 to conduit 17 and then to header 26 of the outdoor coil 12 which operates as a condenser during the cooling cycle 
In { TAIL ~ a cooling mode } of operation { HEAD ~ the high pressure discharge gas } is routed through ports 21 and 22 of four way valve 16 to conduit 17 and then to header 26 of the outdoor coil 12 which operates as a condenser during the cooling cycle
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH