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A water separator “demoisturizes by centrifuging.”
between fully closed and fully open. The more open these valves are, the more the air is expanded and thus cooled to varying degrees. The temperature control valves are nor- mally operated by a temperature controller or computer, but they can be operated manually if there’s a failure.
When in automatic mode, the temperature controller/computer looks at the temperature in the cabin and compares it to the temperature of the air coming out of the ACM. The control- ler will modulate the temp valves to adjust the air coming into the cabin accordingly. When I worked for one of the Cessna-owned service centers, we saw a lot of environmental write-ups throughout the year, and the fix for most of them, maybe 80 percent now that I think about it, was simply cleaning the temp sensors in the cabin and cockpit. If you want to save yourself a little time and money, find out where the temp sensors are in your airplane, lay your hands on them, and you’ll see what I’m talking about. They’re typically very easy to access because they must be in the open air to do their jobs.
The other favor you can do for yourself is to know where your temp sensors are so you’ll know where NOT to throw a pile of coats. If the sensors can’t get a good reading of the cabin’s
temperature, the computer’s automatic function will be completely inoperative.
When the air leaves the ACM at the desired tempera- ture, that air still contains a lot of moisture, especially if you’re operating in humid climates, and spraying all
20 • TWIN & TURBINE / May 2023
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