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Old 08-08-2017, 07:20 PM   #561
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I think what we run across, is that with it in recirc, we can use a substantially lower fan speed, and the evaporator is running at lower capacity to keep the same temp, so the dehumidification is less on recirc. If you had a higher fan speed, it would likely dehumidify more. We rarely need to use more the low speed fan.
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Old 08-08-2017, 07:41 PM   #562
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Just remember that on recirc, you are not bringing fresh air into the cabin. I think that that is the reason the systems are set up to discourage that mode. Modern vehicles are pretty tight when it comes to air leaks. They typically have flaps somewhere that let air out but not in.
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Old 08-08-2017, 08:56 PM   #563
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"Now that is weird, IMO. We use ours on recirc almost all the time. It makes for less humidity and dust coming in and really reduces the duty cycle on the compressor."

I use recirculate in the New Orleans area, but Not when traveling in a dry climate as would have even a more bloody nose, dryness.

My 2013 Honda Accord recirculate or outside is automatic so I suppose it has a humidity sensor?

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If you're recirculating air in a closed environment in which you are are living and breathing, while you may end up with less dust, how can you end up with less humidity?
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Old 08-08-2017, 09:17 PM   #564
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If you're recirculating air in a closed environment in which you are are living and breathing, while you may end up with less dust, how can you end up with less humidity?
Same way as the dust cruising7388. Recirculate stops bringing in nearly as much humidity air.

I don't think that there are systems that cut off all the fresh air from outside for several reasons. Put 4 persons in a passenger car for hours with less o2, grogginess...... Also the co potential...... I would guess that if you turn off the fan, fresh air will still enter while driving. One of my cars had the fan stay on low even though it said off. There was no off.

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Old 08-08-2017, 09:32 PM   #565
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If you're recirculating air in a closed environment in which you are are living and breathing, while you may end up with less dust, how can you end up with less humidity?
The air conditioning is variable output by cycling the compressor, keeping the evaporator at nearly the same temp all the time to have the same exit air temperature cabin. If you have less humidity and temp to remove, like you would on recirc, the compressor runs less to keep the evaporator cool, because the total btu removed is lower. You then just run a lower fan speed instead of moving the temp control knob and mixing in heated air from outside or inside. Less airflow at the same temp will reduce how much humidity it will take out at any given time period. Assuming some air infiltration bringing in air, and a couple of heavy breathes, the humidity seems to stay plenty high with our Chevy in the dry but hot areas. Of course you could also mix the warm heated air to raise the discharge temp to the van, which would also reduce the amount of air going through the evaporator, removing less humidity, regardless if it was inside or outside air. That is why the AC is the most fuel efficient when on the lowest temp setting, regardless of where the air is coming from. Unfortunately a lot of the newer temp controls do their own blending of hot and cold based on inside the vehicle temp, so you have to be able to get a low enough fan speed to basically have the AC just keeping up at the temp you want, so all the air is going through the evaporator.
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Old 08-09-2017, 07:01 PM   #566
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Silver ice

Do you have the adjustable high idle feature?
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Old 08-11-2017, 02:33 AM   #567
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Do you have the adjustable high idle feature?
I'm not sure yet. Dealer said I did, but I haven't dug into that yet.
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Old 08-11-2017, 02:53 AM   #568
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I'm not sure yet. Dealer said I did, but I haven't dug into that yet.
It's a Mercedes Benz option that should appear on your MB window sticker if you had one. It is a $635 add. Normal key start idle is about 800 rpms. The high idle package kick it up to about 1200 rpms. I never read that Roadtrek provided that option and if you didn't get Voltstart installed there would be no reason to do so anyway.
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Old 08-11-2017, 04:39 AM   #569
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I'm not sure yet. Dealer said I did, but I haven't dug into that yet.
If you have it it looks like it's on the dashboard close to the driver door. It's displayed around 5:30 in the utube.

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Old 08-11-2017, 04:55 AM   #570
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It's a Mercedes Benz option that should appear on your MB window sticker if you had one. It is a $635 add. Normal key start idle is about 800 rpms. The high idle package kick it up to about 1200 rpms. I never read that Roadtrek provided that option and if you didn't get Voltstart installed there would be no reason to do so anyway.
I think MB offers two high idle options and RT is using the adjustable one. Although it's of most use in the lithium equipped coaches to help ward off the Voltstart/AC death spiral, I wouldn't be surprised if it ends up as standard equipment for all of their Sprinters.
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