M-20 and homefill system: can't get constant fill...

[PhantomCoral]

I've just hooked up my m-20 to my new homefill system for the first time, and I'm having some issues with the homefill not filling constantly. Is it normal for it to be switching from "filling" to "O2 below normal" every thirty seconds?
I have the M-20 set to about 3 LPMs, and get about 22 seconds of filling followed by 8 seconds of o2 below normal.
Does anyone else using M20s have this issue? what LPM do you fill at?
Thanks!

[drew1492]

Can you adjust the LPM? If you can turn it down. It should fill constantly if you have everything set right and your purity is good. You have a purity issue right now.

[PhantomCoral]

I've tried turning the LPM down to 2 and also up to 5, neither of which seems to change much. I still get about 20 seconds of fill and 8 off.

[PhantomCoral]

I tried messing with the LPM again and found that at ~4.5 after a few minutes it settles in nicely and is now constantly filling.
I had been messing mostly with the LPM settings between 1.5 and 4 and couldn't get the HF to fill constantly for more than 20 seconds at those settings.
So I guess between 4 and 5 seems to be the optimal setting for M-20s.

[Raimond]

Call and ask Jack

[maui greenstone]

How many hours on your homefill unit. I've got one with high hours that does that no matter which concentrator I use to feed it

[ALIEN!]

oxygen sensor issue maybe
.

[istandalone24/7]

i had the same issue with my ex15's.
sweet spot on those is about 6lpm. also when it gets too cold in the basement (where i fill) the low o2 kicks in.

i wonder if there's a way to disconnect the low o2 sensor?

[LowTideGlass]

Why do you have an m-20 set at 3lpm? They are rated for 10lpm. Even at 7-8 Lpm you should be getting very decent purity. I run mine at 9. I think you have it set too low.

Just a thought,

I'd call jack tho.

[PhantomCoral]

I had it set at 2-3LPM because that is what the homefill guide suggest. I thought I had read somewhere that turning up the LPM higher than that causes strain on the oxycon (or homefill maybe?).

I also assumed the m-20 would be getting better O purity at the lower setting, but it seems they don't get great purity when turned way low.

~4.5LPM is the lowest setting I was able to set the M-20 and get a constant fill. Would it fill faster if I turn it up to say 6LPM? or would I just be adding unnecessary strain to the Oxycon and HF?

[khan]

Guys i dont think the bubble setting has ANY effect at all on the oxygen going out the rear outlet.... where you hook up a homefill. That is just how much oxygen is coming out the patient tube in the front.
I usually turn my bubble almost all the way down to nothing... i dont see why i should put out Oxy in the front cause i aint breathing it.

Khan

[khan]

However, It is good to turn your bubble all the way up for about 10 mins before you start the homefill.... that cleans everything out and gets it producing nice and clean Oxy. Then turn it down and turn on Homefill.
Thats my theory anyway

Khan

[PhantomCoral]

There is no rear outlet on the m-20s. At least not on mine. I've been using the front outlet.

[drew1492]

I would be interested in seeing the difference in pressure at the different LPM's on unlimited oxygen. Higher input pressure = quicker fill rates. I used to take invacare oxy cons and jack the regulator up on them to get quicker fill rates usually a few hundred extra psi in 24hour period.

When you turn the LPM gauge up you get higher pressure after you mod the oxy con on invacares.

[khan]

The homefill has to have 14 to 20 lbs to work... i have no idea what the M20 puts out the front but i doubt its that much.

Khan

[Herbie]

Anyone know if its possible to run a homefill system with 1 m-15. Just curious, prolly should've started a separate thread but just wondering

[H1JACK3R]

I've seen them sold as package with the homefill and a single 5lpm unit, so I would assume that would work. Though, I'm not an expert.

[khan]

I did a search for Oxygen Concentrators and there is TONS of info on here... REad it cause its very informative.

[istandalone24/7]

The homefill has to have 14 to 20 lbs to work... i have no idea what the M20 puts out the front but i doubt its that much.

Khan

wrong. the m20 puts out.....20psi.

[PhantomCoral]

So will cranking the LPM up give me faster fill times?

And will cranking up the LPM put extra strain on either the M20 or the homefill?

I'm really curious as to what the LPM sweet spot setting is for the M-20 and homefill combo? right now I'm riding at 6LPM. I've found that too low, ie 2-3LPM, doesn't give me good enough purity, and I'm afraid to crank it up to 10LPM for fear of putting strain on my machines.

Lowtide, you said you ran yours at 9 LPM. Have you had any issues with that at all?

[PhantomCoral]

Oops

[istandalone24/7]

afaik, the homefill only fills at 2lpm, cranking your lpm will do nothing to help it fill, and won't hurt your machine either.
i've heard that slightly higher psi will fill it a bit quicker.

[cade]

you don't want to run your oxycon with any psi after the homefill kicks in. The pump draws the air from the oxycon after it turns on. I Have had issues with a low O2 concentration, usually when it is raining and the humidity is xtra hisgh, but I found running the oxycon at 2 psi for a few minutes when this happens kicks the homefill back on. I have read that oxycons can lose their ability to produce a pure enough oxygen for the homefill to work and you can easily fix that on your own.....Now, I just need to find the thread telling me how to do this..(my oxycon just crapped out)..wish me luck and good luck to you 2.

[istandalone24/7]

can you expand on your first sentence "you don't want to turn your oxycon with any psi after the homefill kicks in".....wtf are you talking about lol?