Hermetically Sealed System Design
Small appliances use hermetically sealed systems that are factory-charged and permanently welded shut. Unlike larger commercial or industrial systems, these units have no field-serviceable valves or access ports installed at the factory. The entire refrigerant circuit, including the compressor, condenser, metering device, and evaporator, is enclosed in a sealed loop that is designed to operate for the life of the appliance without requiring refrigerant service.
Small appliances are factory-sealed with no service valves — the entire refrigerant circuit is a permanently welded, closed loop.
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