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Old 01-24-2020, 07:05 PM   #21
HoloHolo
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Default Re: Sprinter brain aneurism

First, it is stunning to me that 2019/20 MB electronic control modules would be less water-resistant than current cellphones. To Bobtuba and others looking to keep humidity low, while stored on shorepower you could run the heat pump at a low setting. Heat pump and dehumidifier are same technology. Without shorepower use a lot of Damp-Rid-type desiccants. I saw on FB thread that one new Unity owner had water in side airbags and mold. Now, that's a horse of a different color. Did LTV have some chassis awaiting up-fitting stored in an unprotected area? I had "chassis-envy," at first, after buying a gently used 2019 on a 2018 chassis. Now, commiserating with owners of the new rigs, but thankful - hopefully - this is one issue I won't have to confront.
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Old 01-24-2020, 07:34 PM   #22
alichty
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Default Re: Sprinter brain aneurism

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Originally Posted by HoloHolo View Post
First, it is stunning to me that 2019/20 MB electronic control modules would be less water-resistant than current cellphones. To Bobtuba and others looking to keep humidity low, while stored on shorepower you could run the heat pump at a low setting. Heat pump and dehumidifier are same technology. Without shorepower use a lot of Damp-Rid-type desiccants. I saw on FB thread that one new Unity owner had water in side airbags and mold. Now, that's a horse of a different color. Did LTV have some chassis awaiting up-fitting stored in an unprotected area? I had "chassis-envy," at first, after buying a gently used 2019 on a 2018 chassis. Now, commiserating with owners of the new rigs, but thankful - hopefully - this is one issue I won't have to confront.
You might want to do some homework on the AC units in use here - they do NOT have dehumidifier capabilities at all. I do use my heat pump in campgrounds with shore power right up until bedtime but shut it off in favor of propane to keep the noise levels down. I have learned not to expect any level of relief from condensation on the windshield. Like SSTraveler I have been using a reflectix shield on my windshield for the past 5 years now. I am a winter season camper mostly out along the Pacific coastline so am used to a lot of condensation on my windshield since this is our rainy season. I use a squeegee on inside of the windshield with a towel held underneath it to catch the water that literally pours off. I can completely soak a typically hand towel to the extent it needs to be wrung out.

I rarely stay in place during the day since I don't have a toad so I do use my cab AC to dry the air out to the extent I can before parking again for the night. The cab AC will dehumidify the interior air and does a pretty good job of it.
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Old 01-24-2020, 07:35 PM   #23
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Default Re: Sprinter brain aneurism

Wanted to chime in one more time about cracking a window and skylight. When humans breathe and, hence, exhale in a small enclosed space, such as an RV, the amount of condensation that is produced is tremendous.

For those who camp, or have camped, in tents you know what Iím talking about. If you donít unzip a window, for old-school tents, you will wake up in your own dripping rainforest in the morning in certain weather conditions.

Following the first couple nights we used our previous Airstream trailer we awoke to condensation dripping down the windows and aluminum inside the trailer. I knew something had to change or we would be damaging the trailer. Searching online told me that this is a common occurrence. And that the solution was an easy one. Air flow.

Again, I donít know if this is what led to the OPís Sprinter mechanical failure.


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Old 01-24-2020, 07:38 PM   #24
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Default Re: Sprinter brain aneurism

ď...I rarely stay in place during the day since I don't have a toad so I do use my cab AC to dry the air out to the extent I can before parking again for the night. The cab AC will dehumidify the interior air and does a pretty good job of it.Ē



Big plus with a motor home is that ability to use the cab A/C to help dehumidify the air. Didnít even think of that. Thanks for mentioning.


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Old 01-25-2020, 02:30 PM   #25
geds
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Default Re: Sprinter brain aneurism

Interesting discussion here! I open the vent over the shower each night in my 2018 Serenity and have never had a condensation problem. I have over 26K miles and have camped in it all over the US except Florida and New England in conditions from snow to rain to desert.
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Old 01-25-2020, 02:56 PM   #26
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Default Re: Sprinter brain aneurism

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Originally Posted by Meeks View Post
...Again, I donít know if this is what led to the OPís Sprinter mechanical failure.


2020 Unity FX/2019 Chassis (March 2020 delivery)
Nor do I for certain, but I've got a pretty good hunch.
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Old 01-25-2020, 08:17 PM   #27
HoloHolo
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Default Re: Sprinter brain aneurism

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Originally Posted by alichty View Post
You might want to do some homework on the AC units in use here - they do NOT have dehumidifier capabilities at all.
Upon further consideration, alichty is partially correct. As the condenser coils in an A/C (or heat pump) move heat from one side of an enclosure to the other the condenser chills and draws humidity from the air. With a dehumidifier, both the condenser and evaporator coils are within the enclosure, so the dehumidifier blows heated air out the top while the condenser, facing the catch basin, condenses humidity and it drips into the basin. When our Dometic heat pumps are in A/C mode, the condenser faces the enclosure and removes humidity just as a dehumidifier would. However, in heat pump mode the condenser faces the exterior of the coach and does not contribute to dehumidification.

That said, any heat source (heat pump or furnace) will reduce the relative humidity, allowing the air to hold more moisture. When warm air hits a cold windshield, though, the windshield condenses that moisture. I agree with others who open a roof vent slightly since the warm, humidity-laden air will rise and find its way outside.

We've had good success with a windshield cover designed for the OUTSIDE of the windshield and side windows. While we got it to minimize heat penetration, I found that the dead air space created between the cover and glass did a pretty dramatic job of reducing condensation. I also close the vents on the top of the dash at night to reduce drafts. In the morning, turn up the heat, turn bathroom vent fan on low and open the dash vents. Any residual humidity clears within a short time.

Last edited by HoloHolo; 01-25-2020 at 08:24 PM.
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Old 01-25-2020, 08:30 PM   #28
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Default Re: Sprinter brain aneurism

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Upon further consideration, alichty is partially correct. As the condenser coils in an A/C (or heat pump) move heat from one side of an enclosure to the other the condenser chills and draws humidity from the air. With a dehumidifier, both the condenser and evaporator coils are within the enclosure, so the dehumidifier blows heated air out the top while the condenser, facing the catch basin, condenses humidity and it drips into the basin. When our Dometic heat pumps are in A/C mode, the condenser faces the enclosure and removes humidity just as a dehumidifier would. However, in heat pump mode the condenser faces the exterior of the coach and does not contribute to dehumidification.

That said, any heat source (heat pump or furnace) will reduce the relative humidity, allowing the air to hold more moisture. When warm air hits a cold windshield, though, the windshield condendes that moisture. I agree with others who open a roof vent slightly since the warm, humidity-laden air will rise and find its way outside.

We've had good success with a windshield cover designed for the OUTSIDE of the windshield and side windows. While we got it to minimize heat penetration, I found that the dead air space created between the cover and glass did a pretty dramatic job of reducing condensation. I also close the vents on the top of the dash at night to reduce drafts. In the morning, turn up the heat, turn bathroom vent fan on low and open the dash vents. Any residual humidity clears within a short time.
This is correct - our Dometic units do remove humidity in AC mode but the cooling coils get bypassed with the heat pump activated. It sure would be nice if that wasn't true because I'd love a way to wring more moisture out of the air on a cold rainy and windy day along the Pacific coast besides driving. I am seriously eyeballing some of the dehumidifier units on the market for that use case.

I originally thought the heat pump could dehumidify the interior until I figured out the units we have really work.

I have only used the AC a few times even after owning my TB for what will be 6 years in April since I put my RV in storage between Memorial Day weekend and Labor Day weekend. I bring it back out the weekend after Labor Day and use it through the winter.
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Old 01-25-2020, 08:32 PM   #29
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Default Re: Sprinter brain aneurism

I've been thinking about this some more and it stands to reason the Serenity (and rear sleeping areas of Unity's) should have less condensation with the bathroom vent open. I suspect those with the biggest problems are forward sleeping units (Murphy Bed) models because the moisture causing the condensation is from the exhaling of the sleepers. A bathroom vent is probably too far away to do much good for those with the Murphy Bed - or at least it would not vent the moisture as well as with a rear sleeping coach.

Therefore, opening the kitchen vent would do the most good, except the rain sensor frequently closes it during the night - even a heavy dew will trip my rain sensor. So, opening the bathroom vent and adding a fan to move the airflow might just do the trick. And now that I think about it, I usually have a fan on year-round for white noise and to drown out the campground noise.
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Old 01-25-2020, 11:14 PM   #30
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Default Re: Sprinter brain aneurism

Remember that the Fantastic Fan can be opened manually. First turn the fan speed to off then pull the knob down to disengage the motor. Then by turning the knob you can manually open the vent cover as much as you like. I normally open both the bath and main cabin vents just slightly so there is cross ventilation. That is the best way to keep condensation in check.
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