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Old 11-13-2019, 10:33 AM   #1
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2017 19' International
Tallahassee , Florida
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Snowflakes from the heat pump ...

Went camping over the weekend ó spectacular weather, great time to be out with an Airstream ó and when it got cool we used the ACís heat pump, but only briefly.

When we turned on the heat pump, it sent very small flakes of something out of the AC vents and all over the inside of the Bambi.

This is a 2017 19-footer. The air conditioner quit earlier this year (a few weeks before the warranty played out), so this is a brand new unit.

In the summer we ran the AC unit once, just to make sure it worked. No problem.

This is our first time using the ACís heat-pump function.

What could the tiny snowflakes be?
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Old 11-13-2019, 10:39 AM   #2
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If it was cold enough outside then they are indeed snow flakes. The way a heat pump works is it takes air from the outside and extracts heat from it making it even colder. It does this to the point where the outside coils start to freeze. At which point is usually does a reverse cycle and heats the outside to melt the ice while blowing cold air into the trailer. Most larger heat pumps have resistance heaters that heat when this reverse cycle happens and when it is too cold for the heat pump to do much. Usually they stop working well around 40 degrees. Personally, I think an AC with a resistance heater is a better option than a heat pump because of these issues. Also the more damp outside the faster it freezes up.



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Old 11-13-2019, 10:45 AM   #3
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Ducted ac? Many reports of the white flakes. Most likely shavings from cutting the ductwork that remained in the ducts. If you have ever cut pvc pipe with a chop saw you know how the shavings cling to the pipe due to static charge.
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Old 11-13-2019, 02:37 PM   #4
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Wow. A snow maker!!
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Old 11-13-2019, 03:35 PM   #5
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It wasn't all that cold, so I doubt it was real Airstream-generated snow, and they didn't melt.

This is ducted vents. We have run the AC before a number of times with no snow or rain, just wind.
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Old 11-13-2019, 08:15 PM   #6
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I've seen it before in the newer ducted units. Eventually the snow stops. If it doesn't, maybe I can invent a snow shovel for duct snow.
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Old 11-14-2019, 11:02 AM   #7
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