A second four way reversing valve is provided in the refrigerant circuit between {HEAD ~ outlets} of {TAIL ~ indoor and outdoor coils} to direct refrigerant through liquid lines of the refrigerant circuit from the outlet of one coil used as a condenser to the expansion means of the other coil used as an evaporator 
A second four way reversing valve is provided in the refrigerant circuit between { HEAD ~ outlets } of { TAIL ~ indoor and outdoor coils } to direct refrigerant through liquid lines of the refrigerant circuit from the outlet of one coil used as a condenser to the expansion means of the other coil used as an evaporator
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