2018 Thor 24.1 Axis Water Issue

[cjones1258]

I have just hooked up to water for the camping season and have no water when I turn on a faucet on the hot side. The cold works fine. Need some help!

Thank you,
Casey

 

[16ACE27]

Have you deswinterized your RV? Valves at the water heater have to be returned to "normal" positions.

 

[cjones1258]

That’s what I was doing. Just hooked up to water at the campground and water flows through the cold lines just not on the hot side. 1st time RV owner. Ugh

 

[16ACE27]

That’s what I was doing. Just hooked up to water at the campground and water flows through the cold lines just not on the hot side. 1st time RV owner. Ugh

Look at the first sticky thread in this area. It's about winterizing a 24.1. You need to dewinterize.

Winterizing your RV (Axis/Vegas 24.1 specific)

Unfortunately, it is that time of year again (at least for me). Time to get the unit ready for winter. :( Since there are a ton of new Axis/Vegas owners on here since the last thread of this type I figured I'd start a new one. (Most of this is specific to my 24.1 but will probably apply to the...

www.thorforums.com

Also, look in the Resources area under Thor Manuals and scroll down to the Crowd Sourced Axis/Vegas manual and download it for more education.

Axis Vegas Crowd Source Manual

This is an update for the Axis/Vegas Manual. Thanks to David Marchand, we have an update to the manual that includes info on many of the system upgrades on Axis/Vegas through 2020+. More on that later below. To date, approximately 18,000 owners...

www.thorforums.com

Ask more questions here when they come up.

 

[Jimbo57]

That’s what I was doing. Just hooked up to water at the campground and water flows through the cold lines just not on the hot side. 1st time RV owner. Ugh

On mine MH the hot water has its own valve which also has a normal setting. I had to take a black marker to color raise letters since I can hardly see labels

 

[dagst1]

Unless there is something that I am unfamiliar with on his motorhome when you winterize the water heater by pass just takes the water heater out of line and connects the cold feed and the hot output together allowing the antifreeze to flow thru both the hot and cold lines. So if the valves are not returned to the "normal" position there still should be flow to both sides of the faucet.

Are you sure the water heater tank is full of water?

Is this a tank or tankless water heater?

 

[16ACE27]

Unless there is something that I am unfamiliar with on his motorhome when you winterize the water heater by pass just takes the water heater out of line and connects the cold feed and the hot output together allowing the antifreeze to flow thru both the hot and cold lines. So if the valves are not returned to the "normal" position there still should be flow to both sides of the faucet.

Are you sure the water heater tank is full of water?

Is this a tank or tankless water heater?

Good questions.
But if the bypass is closed and the water heater isolation valves are also left closed then there would be no HW flow. That's why I said "Valves at the water heater have to be returned to "normal" positions."

 

[dagst1]

Every by pass I have ever seen does just that -- by passes the water heater by connecting the cold in and the hot out. Never seen one with isolation valves. If you have a by pass then what is the point of the isolation valves?

 

[16ACE27]

Every by pass I have ever seen does just that -- by passes the water heater by connecting the cold in and the hot out. Never seen one with isolation valves. If you have a by pass then what is the point of the isolation valves?

To prevent antifreeze from going into the water heater. To isolate the water heater for maintenance/removal.

There are two different types of valves associated with water heater plumbing:

Simple ON/OFF valves - 3 of them - input, outlet, and bypass

3-way valves - 2 of them - These redirect flow in and out of WH to the bypass line

 

[dagst1]

I fully understand what a by pass does from 3 valve to 1 valve but still have never seen one with a bypass and isolation valves. The bypass isolates the water heater. So where is the isolation valves located? And why are they needed with a by pass?

 

[16ACE27]

I fully understand what a by pass does from 3 valve to 1 valve but still have never seen one with a bypass and isolation valves. The bypass isolates the water heater. So where is the isolation valves located? And why are they needed with a by pass?

Explained in post #9 above with pictures.

Only 3 way valves ALSO provide isolation. A simple on/off bypass valve does not.

 

[dagst1]

Ok I think I see now. What you are referring to as "isolation" valves I call then the by pass valves. To by pass the water heater all three need to be in the proper position.

Yes if they have the three valve system it would be possible to not have all the valves in the correct position. Just to me if your in there and you turned all 3 to winterize you would remember to turn all 3 to DE winterize.

 

[dagst1]

Explained in post #9 above with pictures.

Only 3 way valves ALSO provide isolation. A simple on/off bypass valve does not.

I guess a difference in what you call the valves and what I have called them.

 

[16ACE27]

But this is a "New RVer" and may know nothing about what the "normal" positions should be.

Some times you only see a simple ON/OFF isolation valve on the cold water inlet side because there is an integrated check valve on the outlet side of the WH.

 

[16ACE27]

I guess a difference in what you call the valves and what I have call them.

Yes, names make a difference and are usually related to the actual function of the valve. An isolation valve can not be a bypass valve unless it is a 3-way valve.

 

[dagst1]

That is correct a 1 valve by pass uses a check valve in the hot outlet.

My confusion was the isolation valves. I consider that part of the 3 valve bypass and have never heard then called isolation valves.

Learned something new to watch out for.

 

[MCP-THOR]

And a little schematic to clarify for the simple three valve system for anyone needing it.

 

[dagst1]

Things have changed a lot in the last 50+ years. I can remember when water heaters did not even have by passes. You had to remove the lines and connect them together. Just never heard the term "Isolation valve" related to a by pass.

 

[ducksface]

Unless swapped out by a prior owner
The op has a tankless water heater.

He needs to;
get off of shore water
Use his pump
Tell us what his controller is doing
Report back.

Why would anyone with a tankless want/need a bypass?
Bypass/isolation serves no purpose other than saving you gallons of antifreeze IF you use antifreeze.
What rv manufacturer would install such a valve on a tankless?

 

[ducksface]

So,
Tankless has a isolation isolating bypass valve...
You isolate the tank in the tankless that doesn't have a drain valve(my guess)...
You fill the system with antifreeze(except the isolated tank) and the tank has to freeze and bust. Has to.

Now what?