Skip to main content ↑ ↓
Topic: Aqua Hot Mixing Valve (Read 1018 times) previous topic - next topic

Aqua Hot Mixing Valve

I'm dewinterizing my U320 and can't get hot water for long. The AH is firing as expected and circulating warm coolant to the registers. When we have a tap call for hot water it goes hot briefly and then turns cold. I have tried removing the burner and turning the mixing valve knob back and forth a few times to no avail. Is it time for a new mixing valve? I vaguely recall somebody just replacing the valve guts?
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #2 –
Many of us have done that. If you have a Grainger near you here is a cheaper option.

https://www.grainger.com/product/26X141?gucid=N:N:FPL:Free:GGL:CSM-1946:tew63h3:20501231
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Aqua Hot Mixing Valve

Reply #3 –
That's exactly what I did also. Guts only

Re: Aqua Hot Mixing Valve

Reply #4 –
Thanks guys
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #5 –
Elliott
Hopefully that solves your issues!
When that happened to me there was an extreme sediment buildup in the ah loops which could not be removed. Sad story....require the Ah loops to be replaced. Mega coach bucks
Good luck....
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: Aqua Hot Mixing Valve

Reply #6 –
Elliott;  do you believe you might still have air in the lines to those faucets?  Just a thought.  I also replaced the guts on mine, but if you had warm heat at the registers, not sure if that is the issues.  Just thinking out loud.  Good luck and please post what you find.
Joe & Dottie Allen
Sold!  December 2023.      2000 U320; build # 5645
Our coach " Maxine"
Motorcade #  15922;  Escapee 150950; FMCA F330833; Boondockers Welcome;  Harvest Hosts;  Thousand Trails
'98 U320 from 2000-'06
USAF '62-'66

"Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for." ―Epicurus

Re: Aqua Hot Mixing Valve

Reply #7 –
Quote from: juicesqueezer –
Elliott;  do you believe you might still have air in the lines to those faucets?  Just a thought.  I also replaced the guts on mine, but if you had warm heat at the registers, not sure if that is the issues.  Just thinking out loud.  Good luck and please post what you find.
Good question and one that gave me pause when I started troubleshooting this. I don't think that's the case though because I have great pressure, even with the faucet set all the way to hot. I suppose I could shut off the cold line at the manibloc to confirm. I'll do that today, thanks Joe
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #8 –
The repair kit is also available Watts LF70A-RK
2014 Newell 2020P

Re: Aqua Hot Mixing Valve

Reply #9 –
Quote from: hypoxia –
The repair kit is also available Watts LF70A-RK

Good find, here is where it can be bought,

Watts 1/2 in. to 3/4 in. Repair Kit for Lead-Free Tempering Valve
As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Aqua Hot Mixing Valve

Reply #10 –
You might consider doing the vinegar wash thing too.
Keith
2003 U320 38' #6197

Re: Aqua Hot Mixing Valve

Reply #12 –
Thanks guy, I'm planning on the acid wash later this spring. I have company in the coach for the next few weeks and don't want to bring the water system down to do it right now.
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #13 –
Quick question as I prep to replace the valve guts today: are there any secrets to correctly setting the valve position after I install the new guts?  Adjusting the valve is a real pain to do given it's location under the burner so I'd rather not do it by trial/error and removing the burner multiple times.
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #14 –
Before you take the old one apart look for some red paint on the handle and remember its position. Then turn the valve all the way closed counting the turns. When you put the new parts in close the valve and count the turns back equal to the old one.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Aqua Hot Mixing Valve

Reply #15 –
Thanks for all the help on this guys, she's working like a charm now. I had a brief moment of panic when the nut on the eyebolt on the backside of the burner spun free, but then I realized I had just bumped the directional switch to neutral on the back of my ratchet  :))
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #16 –
Just attaching a photo of the valve guts for anyone who hasn't seen them before
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #17 –
Elliott, Thanks for showing the pic of the valve. I am trying to replace mine as well, but having an issue unscrewing the valve.  I suspect mine is an original from 1998.  Did your valve unscrew pretty easy or did you have to use a spray or heat to loosen?  I have been trying for two days and really don't want to break or snap the copper.  I have used heat so far but not working.  Thoughts??  Thanks.

Re: Aqua Hot Mixing Valve

Reply #18 –
Quote from: Clysack07@gmail.com –
Elliott, Thanks for showing the pic of the valve. I am trying to replace mine as well, but having an issue unscrewing the valve.  I suspect mine is an original from 1998.  Did your valve unscrew pretty easy or did you have to use a spray or heat to loosen?  I have been trying for two days and really don't want to break or snap the copper.  I have used heat so far but not working.  Thoughts??  Thanks.
I was able to get mine off with some channel locks
1987 Grand Villa ORED
2001 U320 4010

Not all that wander are lost... but I often am.

Re: Aqua Hot Mixing Valve

Reply #19 –
Quote from: Clysack07@gmail.com –
Elliott, Thanks for showing the pic of the valve. I am trying to replace mine as well, but having an issue unscrewing the valve.  I suspect mine is an original from 1998.  Did your valve unscrew pretty easy or did you have to use a spray or heat to loosen?  I have been trying for two days and really don't want to break or snap the copper.  I have used heat so far but not working.  Thoughts??  Thanks.

On mine, I had to attach vice grips as tight as I could make them and beat on it with a hammer. I had read another thread on the forums where they had to do the same.

Back up the rest of the area with channel locks while using the extreme measure. 
AH not working on diesel 


Dan - Full timing since 2009
2003 U320 40' Tag 2 slide

Re: Aqua Hot Mixing Valve

Reply #20 –
I had the same issue. As Rudy pointed out in my thread it is pretty rugged.
Aqua Hot - Water Heating Issue
Jeff & Carolyn
1999 36ft. U320 Foretravel
 

Re: Aqua Hot Mixing Valve

Reply #21 –
Quote from: RvingJeff –
I had the same issue. As Rudy pointed out in my thread it is pretty rugged.
Aqua Hot - Water Heating Issue
Copper tubing considered tough? Maybe that explains why mine originally started leaking at a sweated fitting. Never could explain it leaking. IMO I'll slit the nut rather than beat on a copper manifold. Hope you reinstalled with Anti seize