In a cooling mode of operation 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 {HEAD ~ the outdoor coil} 12 which operates as {TAIL ~ a condenser} during the cooling cycle 
operates as
In a cooling mode of operation 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 { HEAD ~ the outdoor coil } 12 which operates as { TAIL ~ a condenser } during the cooling cycle
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH