I believe it's a physics and a pressure thing that requires the smaller hose at the bottom of the condenser. The hot compressed gasses flow into the top of the condenser where they are cooled off. As the gas cools it condenses and exits the bottom of the condenser as a high pressure liquid. There should be three different size hoses: #8 from the compressor to the condenser, #6 from the condenser through the drier to the evaporator and #10 from the evaporator back to the compressor.
Ron
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