求翻译：Some models of the Haier heat pumps include an orifice (also called "flow rater" or "piston") in a small bag taped to the side of the heat pump. If the heat pump you purchase includes this orifice, you will need to replace the orifice already inside the air handler with the heat pump's included orifice. Doing so makes the heat pump and air handler compatible. You can view this step-by-step guide to see how to easily change the orifice.是什么意思？

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