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Help me understand how humidifier levels are managed by the xPAP
#1
For the last 10 days or so I've been plagued with rainout, at different levels.  Happened mildly once or twice over a year ago for a day or so but now I wake up with a water blocking sound, heavy!

Same machine, mask, environment, machine position vs. tube.  Set my dreamstation down to "1" on the humidifier level, kept minimal water level, still happening, can't figure it out.

My one good night in the last few days was when I left the reservoir empty.  But that is not ideal in terms of a rough throat.

So question:  if I set the humidifier level to 0 or 5 (relative to a Dreamstation), but keep some water in the reservoir, what exactly does the DS change?  There are no flaps past the pre-humidifier out that could control, so does the base unit sense humidity or vary the airflow towards the water if on?

At this point curious to understand:  on a Dreamstation with a humidifier attached, what mechanically happens when selecting 0 through 5 on the humidifier?

Maybe 0 and water can still take the edge off?

Thanks in afvance.
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#2
Try hanging up hose in a nshape while you are sleeping.
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#3
Are you using a heated hose? Also try a fleece cover on your hose? This really does help with rainout.
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#4
Resmed uses heat to control the amount of humidity, going up in settings raises the level of heat and thus the humidity. Not sure about PR machines but I suppose similar. If the rainout happened about the same time you turned on your air conditioning you may be getting condensation due to temp. differences. Do you have a heated hose or hose cover, if it is condensation, insulating the hose will help. It also helps to have the machine lower than your head; any droop in the hose will allow water to accumulate.
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#5
Have you tried turning on the adaptive setting on the humidifier? It may help. You would still be able to set the humity level in the same manner as before.

If that doesn't work I would also suggest a heated hose. I bought one when I first started cpap, due to rainout. After the first few nights I found I didn't have to run the heat on the hose. I have been running my DreamStation with the heated hose and using the adaptive setting. Haven't had rainout since. I think the humidity sensor in the mask end of the hose detects the moisture in the hose and adjusts the humidity level accordingly as long as the humidifier is running on the adaptive setting.

Some people are able to turn the heat off on the humidifier and use passive humidity. Passive humidity isn't enough for me.
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#6
If you are using a heated hose, and after two years it is starting to fail, that could explain the symptoms you describe. The only other thing I can think of is a change in in environment such as a new air conditioner, but you say there are no environmental changes. So the failure of the heating element in the heated hose, if you have one, is all I can think of.

By the way, fill the tub all the way to the maximum level. If you have less water in there it will heat up faster and cause more rain out.

Oh, I just thought of another possible cause. The control circuit for the heated humidifier may have failed and the heater for the reservoir (not the heater in the hose) is now on full blast. Some detective work with a temperature sensor may be needed.

The heater in a heated hose prevents rain out, the heater for the reservoir causes rain out (when set too high).
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#7
At least for now, until you can implement some of the other suggestions, place your xPAP on the floor, at least lower than your mattress, that way condensation will drain back to your humidifier.
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#8
Thanks for the info.

Should have mentioned that I do not have a heated hose.

Also, had been using the "adaptive" option since the start, changed it now to see if it would make a difference - it did not.

For the short term will take the advice of lowering the machine (placing it on the floor) / reshaping the hose. Will still try to figure out what changed all of a sudden.
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#9
(05-21-2017, 08:20 AM)DanPrado Wrote: For the short term will take the advice of lowering the machine (placing it on the floor) / reshaping the hose.  Will still try to figure out what changed all of a sudden.

If you have the patience, measure the temperature of the water when the humidifier is set on its lowest setting and again when its on its highest setting. If you don't get a significant temperature difference that could indicate that the heater control circuit has failed and the heater is on full blast all the time.
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#10
(05-21-2017, 10:44 AM)Sleepster Wrote:
(05-21-2017, 08:20 AM)DanPrado Wrote: For the short term will take the advice of lowering the machine (placing it on the floor) / reshaping the hose.  Will still try to figure out what changed all of a sudden.

If you have the patience, measure the temperature of the water when the humidifier is set on its lowest setting and again when its on its highest setting. If you don't get a significant temperature difference that could indicate that the heater control circuit has failed and the heater is on full blast all the time.

Ah, maybe this is a piece of the puzzle that I am missing:  I bought a plain Dreamstation without a heated hose (and forget if there was a heat option that modified the AC adaptor, if there was I skipped it as well).

Does even a plain DS still use heat to manage the humidifier level?
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