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