An accumulator is a safety reservoir located near the compressor that catches any liquid refrigerant before it can enter the compressor motor. Since compressors are designed to pump gas, liquid refrigerant can cause catastrophic mechanical failure. This component is a standard safety feature in all our heat pump condensers. It ensures that your Mitsubishi or Cooper&Hunter system remains reliable even during rapid temperature changes. If you are browsing our great deals and more, rest assured that our systems are built with these heavy-duty protections. It is a "silent guardian" for your system's most expensive part.