Room Air Conditioners Automatic Expansion Valves

Automatic expansion valves are used on some room air conditioners instead of the capillary tubes to control the flow of refrigerant into the evaporator. These valves are set to maintain a normal suction pressure. They are factory adjusted and sealed, and no field adjustment is required. A small bleed port in the valve permits pressure equalization from the high to low side on shutdown. A small liquidline strainer is located in the liquid line ahead of the expansion valve.

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