Overboard discharge: Marine Air Conditioning Definition
The hull fitting above the waterline where the warmed cooling water leaves. Your health check.
Overboard discharge in a Boat Air Conditioning System
With the unit running there should be a steady trickle of warm water here. No trickle means the seawater side rather than the refrigeration, and that is nearly always a blocked strainer. It is the first thing to look at with any fault and the easiest thing on the boat to check.
Using Overboard discharge Specifications in Quotes and Manuals
Use this definition to understand a quote, manual or fault report—not as an instruction to modify the boat. Before buying, compare the wording against the current manufacturer documentation. For refrigerant, fixed 240 V wiring or below-waterline work, use the official licensing and standards sources and an appropriately qualified tradesperson.
Start with the complete system guide for context, or check the owner questions for plain-language answers. Technical information can change or be wrong; the disclaimer explains the limits.