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Resmed S-9 Humidifier off, but reservoir empties
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remltr Offline

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Post: #1
Resmed S-9 Humidifier off, but reservoir empties
I filled my reservoir on Saturday and by Wednesday morning it was empty. I had turned off humidity on Saturday night.

Not a major issue as I know I can just leave the reservoir empty. I just find it curious.

Anybody else notice this?
12-03-2014 09:59 PM
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zonk Offline

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Post: #2
RE: Resmed S-9 Humidifier off, but reservoir empties
You can remove the humidifier altogether and attach the hose directly into the S9
Water in the tank and humidity off (passover), the air still picking up some moisture, also some water lost due to leaks
12-03-2014 11:25 PM
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pmyokhin Offline

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Post: #3
RE: Resmed S-9 Humidifier off, but reservoir empties
During these winter months, when living in homes with forced air heating systems, the furnace will dry out the air significantly. If you do not use a humidifier in your home to reintroduce the loss humidity of the air, this dry air will be sucked into the CPAP machine and blow over the water reservoir and draw the moisture from the water sitting in the well of the CPAP humidifier - even when the humidifier is turned off. To avoid this, your only alternative is to remove the humidifier from the CPAP unit. This applies to all CPAP units with humidifiers attached. Else, look for a leak in the water well of the humidifier.
12-04-2014 08:11 AM
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PaytonA Offline
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Post: #4
RE: Resmed S-9 Humidifier off, but reservoir empties
(12-04-2014 08:11 AM)pmyokhin Wrote:  During these winter months, when living in homes with forced air heating systems, the furnace will dry out the air significantly.

Actually any heating system when it is cold outside will make the heated air very dry. For instance, if you have 75 deg. F air at 40% relative humidity and you heat it to 85 deg. F, the relative humidity drops to 10%. The chart that I found did not go below 75 deg F but you can see that if you heat outside air at 40 deg F and 50% RH all the way up to 70 deg F the RH will be extremely low regardless of the method of heating.

Best Regards,

PaytonA
12-04-2014 10:38 AM
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Galactus Offline

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Post: #5
RE: Resmed S-9 Humidifier off, but reservoir empties
This article on the subject was quick and interesting;
http://usatoday30.usatoday.com/weather/wdryout.htm

This can be found in the article above as well, and was equally interesting;
http://usatoday30.usatoday.com/weather/whumdef.htm

If everyone thinks alike, then someone isn't thinking.
Everyone knows something, together we could know everything.
(This post was last modified: 12-04-2014 09:32 PM by Galactus.)
12-04-2014 09:30 PM
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PsychoMike Offline

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Post: #6
RE: Resmed S-9 Humidifier off, but reservoir empties
Yup...as others have said, even with the humidifier off, the air you are breathing still passes over the water in the tank (unless you take the humidifier completely off or leave it empty). The dry air will pick up a little bit of humidity as it does (hence "pass over humidification"). It is perfectly normal and part of the design of the humidifier.
12-05-2014 12:21 PM
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OMyMyOHellYes Offline

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Post: #7
RE: Resmed S-9 Humidifier off, but reservoir empties
In the old days (damn, did I just say that?!?), back before heated humidification became the norm, there were passive humidification systems that just ran the air over water in a tank. The current DeVillbiss Intellipap (yay!) shuts off the heat to the humidifier when running on 12V DC power making it passive humidification (there are a lot of functional features in that unit I highly respect-I think it is under rated).

If you sit out a bowl of water for a week or so, the water is going to evaporate. It humidifies the air. Not a efficiently as heating the water a few degrees, but it does none the less.

If I was thinking of not using water at all in the S9, I would just remove the entire humidification unit. I am leery of running anything heated that is designed to hold water, without the water to absorb that heat. Probably would do no damage, but the water does work as a heat sink in the design. And why burn the energy?

OMM
12-06-2014 08:03 AM
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gondolabob Offline

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Post: #8
RE: Resmed S-9 Humidifier off, but reservoir empties
(12-06-2014 08:03 AM)OMyMyOHellYes Wrote:  In the old days (damn, did I just say that?!?), back before heated humidification became the norm, there were passive humidification systems that just ran the air over water in a tank. The current DeVillbiss Intellipap (yay!) shuts off the heat to the humidifier when running on 12V DC power making it passive humidification (there are a lot of functional features in that unit I highly respect-I think it is under rated).

If you sit out a bowl of water for a week or so, the water is going to evaporate. It humidifies the air. Not a efficiently as heating the water a few degrees, but it does none the less.

If I was thinking of not using water at all in the S9, I would just remove the entire humidification unit. I am leery of running anything heated that is designed to hold water, without the water to absorb that heat. Probably would do no damage, but the water does work as a heat sink in the design. And why burn the energy?

OMM

I don't use the humidifier and leave it attached but turned off without any problems. I prefer to have it attached as imo it helps keep the machine in place when I toss and turn during the night,
12-06-2014 01:27 PM
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trish6hundred Offline

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Post: #9
RE: Resmed S-9 Humidifier off, but reservoir empties
(12-06-2014 01:27 PM)gondolabob Wrote:  
(12-06-2014 08:03 AM)OMyMyOHellYes Wrote:  In the old days (damn, did I just say that?!?), back before heated humidification became the norm, there were passive humidification systems that just ran the air over water in a tank. The current DeVillbiss Intellipap (yay!) shuts off the heat to the humidifier when running on 12V DC power making it passive humidification (there are a lot of functional features in that unit I highly respect-I think it is under rated).

If you sit out a bowl of water for a week or so, the water is going to evaporate. It humidifies the air. Not a efficiently as heating the water a few degrees, but it does none the less.

If I was thinking of not using water at all in the S9, I would just remove the entire humidification unit. I am leery of running anything heated that is designed to hold water, without the water to absorb that heat. Probably would do no damage, but the water does work as a heat sink in the design. And why burn the energy?

OMM

I don't use the humidifier and leave it attached but turned off without any problems. I prefer to have it attached as imo it helps keep the machine in place when I toss and turn during the night,
Hi gondolabob,
WELCOME! to the forum.!
Much success to you as you continue your CPAP therapy.

trish6hundred
12-06-2014 04:05 PM
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TyroneShoes Offline

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Post: #10
RE: Resmed S-9 Humidifier off, but reservoir empties
(12-06-2014 08:03 AM)OMyMyOHellYes Wrote:  ...back before heated humidification became the norm, there were passive humidification systems that just ran the air over water in a tank...
I think that when you "turn off" humidification on the S9, this is exactly what your are doing. IOW, simply turning the heater plate off that raises the water temp a few degrees.

All that will really do is make the "pass-over" less efficient. It will still evaporate and humidify the air, just not as efficiently or as much as if it were heated. So the water will not disappear as fast, but certainly should not be expected to still be there after 4 days.


So that should really not come as a surprise.
12-10-2014 08:29 PM
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