How do I test if this limit switch is bad

Universal Compatibility: Approved for use with common refrigerants including R404A

it excels in maintaining constant superheat

including the Lochinvar Knight

some outdoor units may require a hard start kit to assist the compressor during startup against the valve's pressure

Utica-Dunkirk 17400510000003 Valve 323080-701 How do I test ifThe Utica Dunkirk 17400510000003 Valve, also known as the VLV DRAIN 09 15BTU HP PTAC, is a critical thermal drain valve designed for Packaged Terminal Air Conditioner units. Specifically engineered for heat pump PTAC systems ranging from 9,000 to 15,000 BTU, this OEM replacement part manages condensate drainage during the heating and cooling cycles. In HVACR refrigeration units, the PTAC drain valve regulates the flow of water out of the base pan to