When charging an R-410A system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least ______ psig before switching to liquid.

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When charging an R-410A system with a water-cooled condenser, you start by charging with vapor to get the system pressurized and to help move oil and refrigerant through the lines before introducing liquid. Water-cooled condensers run at higher condensing pressures, so you wait until the system pressure is around 120 psig before switching to liquid. Reaching this vapor-pressure threshold helps prevent liquid from reaching the compressor too early (which can cause slugging and lubrication issues) and ensures the initial fill is distributed properly through the evaporator and crankcase. Once that vapor stage is established, you switch to liquid to complete the charge safely.