Drain connection information for the 5500 AMC can be found in the 5500sc Ammonia Monochloramine Analyzer Installation Manual_DOC023.97.80473.
The below document contains a different view of the drain connections and shows a diagram from the inside of the analyzer. The picture includes which tubing connects to which drain port.
See the following articles for more information on 5500 AMC plumbing
Was there a change to the drain plumbing configuration on the 5500sc Ammonia Monochloramine (AMC) Analyzer?