Roadtrek

Roadtrek

Wednesday, October 18, 2017

PUTTING THE HOT WATER HEATER INTO BYPASS

This is an article that we have been asked to write a number of times and it is a common question that comes up on Facebook groups and forums. The Suburban Hot Water Heater in the Roadtrek has THREE (3) BYPASS VALVES to put the hot water heater into BYPASS MODE when winterizing or when you want to take the hot water tank out of the flow of water in the plumbing. The 210 valves and location are at the end of this article.

Here is a photo of the hot water tank inside my Roadtrek 190:


You can see the three valves that need to be set here against the foam insulation around the hot water tank. I will go into detail about these three valves but using this photo, I am going to explain the flow of water in and out of the hot water heater. The water source can be from the water pump or from city water - the water that comes into the plumbing when you connect a fresh water hose with an RV water pressure regulator connected to the hose that is connected to an outdoor water spigot.

Take a look at the pipes in front of the foam insulation around the tank. There is one that goes across the tank at the top. There is one that goes across the tank at the bottom. There is one that goes up and down between those two pipes.

When the hot water tank is in use - NOT BYPASSED - the cold water comes into the hot water tank in the bottom tank. You can see the COLD sticker there next to the valve.  Inside the tank the heating unit makes the water hot and the hot water stays in the tank until you turn on the faucet hot handle or the hot handle on either of the shower faucets. When water leaves the tank, water is instantly put back into the tank at the bottom filling it back up again. As I have written in another article - the hot water tank is never empty - unless you remove the anode rod that is in the compartment for the hot water heater outside on the driver's side of the van. Now knowing this - this is how the valves work.

The valve on the bottom of the tank when OPEN lets water flow into the tank. When it is closed, the cold water does not go into the tank. Here is a photo of the bottom valve closed. Note that this valve broke on my Roadtrek and the service at the Roadtrek dealer replaced it with a metal handled valve - your valve will have a black handle if it is the valve that came from Roadtrek (just like the other valves you see in the photo).


THIS VALVE IS IN BYPASS POSITION. This is how you want to set your valve when it is to be put in BYPASS MODE. Notice that the valve is turned ACROSS the pipe (side to side). THIS VALVE IS CLOSED.   (If this valve was turned in line with that pipe - going from front to back - this valve would be OPEN - allowing water to flow into the hot water tank.) IN BYPASS YOU WANT THIS VALVE TO BE CLOSED - JUST AS IT IS IN THIS PHOTO.

We look next to the valve on the pipe going into the tank at the top of the tank. There is a red sticker that says HOT next to that valve. This is where the hot water comes out of the tank.




THIS VALVE IS IN BYPASS POSITION. This is how you want to set your valve when it is to be put in BYPASS MODE. Notice that the valve is turned ACROSS the pipe (side to side). THIS VALVE IS CLOSED.   (If this valve was turned in line with that pipe - going from front to back - this valve would be OPEN - allowing water to flow OUT OF the hot water tank.) IN BYPASS YOU WANT THIS VALVE TO BE CLOSED - JUST AS IT IS IN THIS PHOTO.

These two valves open or close the pipes that put water into and out of the hot water tank. They are important parts of the BYPASS three valve system - and in BYPASS they must be CLOSED. But we have a third valve - the one on the pipe that goes up and down between the other two pipes. This is actually the main valve for BYPASS. What this VALVE IS OPEN cold water goes from the bottom pipe (where it cannot go into the hot water tank any longer because the bottom valve is CLOSED) and goes up the up and down pipe. Take a look at the valve on that pipe -

 THIS VALVE IS IN BYPASS POSITION. This is how you want to set your valve when it is to be put in BYPASS MODE. BUT TAKE NOTICE  that the valve is turned in line with the direction of the pipe pointing UP. THIS VALVE IS OPEN!   (If this valve was turned across the pipe and the end pointing toward the cabinet opening - pointing toward the aisle - going across the pipe - this valve would be CLOSED and water could not go up the pipe. IN BYPASS YOU WANT THIS VALVE TO BE OPEN - JUST AS IT IS IN THIS PHOTO.

So what happens in BYPASS - cold water comes in at the bottom pipe and goes UP that up and down pipe and goes into the top pipe and then continues along in that pipe to the sink. IF you have your hot water tank in BYPASS - no water ever goes inside the hot water tank - and if you turn on the hot water faucet at the sink or the showers you will get COLD water coming out of the sink - even though you turned the hot water handle on. That is exactly what you want it to do.

Why do you want to Bypass the hot water tank? When winterizing if you do not bypass the hot water tank will fill with RV anti-freeze before that anti-freeze will go into the sink or showers and their respective pipes. The hot water tank is SIX GALLONS! You will waste SIX GALLONS of RV anti-freeze before every putting the RV anti-freeze where it is needed. And since the hot water tank is always full - well that is a lot of wasted anti-freeze! Emptying the hot water tank will protect it just fine. These valves and these pipes will fill with RV anti-freeze in the process I describe in my articles to winterize your Roadtrek.

So let's go back over this step by step  -

1) Turn the bottom valve ACROSS the pipe - CLOSING THE VALVE.

2) Turn the top valve ACROSS the pipe - CLOSING THE VALVE.

3) Turn the middle valve - pipe going up and down - in line with the pipe with the handle pointing UP - OPENING THE VALVE.

YOU NOW HAVE A HOT WATER TANK IN BYPASS!


 In the Spring to put the hot water tank back into the water system to provide hot water reverse these steps. In working position, all the tips of the valve handles point toward the aisle. The top and bottom valves will be OPEN and the up/down pipe valve will be CLOSED.

There is one thing you may want to also do - and this is up to you.  I get concerned that if we are inside the Roadtrek or traveling with it when winterized, one of us might - by accident - turn on the hot water heater switch on the wall - with the hot water tank empty. That will do serious damage to the hot water tank and hot water heater. There is a fuse (the hot water heater is a 12 volt appliance) - not a circuit breaker - in the Roadtrek fuse box for the hot water heater and that is all that is on that fuse. By removing the fuse you cannot turn on the hot water heater - no matter how the switch is set. JUST REMEMBER when de-winterizing to put that fuse back or your hot water heater will not turn on.

Thanks to a very gracious reader, Nick, we have been able to now include where these valves are in a Chevy Roadtrek 210.  Nick took the photos inside his 210 for us. These same valves are in a different location in the 210. Here is a photo of the cabinet they are located just below the sink -

 



The valves on the right side of the cabinet on the left wall of the second shelf section

The hot water tank is inside the cabinet to the left..

Here is a close up look inside this section of the cabinet -

You can see the valves pointed to with the red lines and labeled. To orient these to our article turn the photo counterclockwise:

The valves are turned just as they are in the 190 when putting the hot water tank into bypass or taking it out of bypass. 

Here is where the hot and cold water pipes go through the cabinet wall to the cold intake and hot output connections on the hot water tank:




5 comments:

  1. I just woke up so I may not be completely coherent but I have a 2012 170. I have never completely understood the terminology to get this setup right. Let me just ask this, if all the valves are open, then the hot water heater water can be used. If all the valves are closed then the hot water heater water cannot be used. Yes?

    Another thing, I don't see 3 valves in your pictures unless you're also considering the one with a red handle.

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    1. With a three valve system - looking at the photos above - there is a valve a black valve at the top, there is a black valve in the middle on the pipe that goes from top to bottom and there is a brass valve on the bottom - all on the pipes right against the foam of the hot water heater insulation. (MY BOTTOM VALVE IS A BRASS VALVE BECAUSE IT HAD TO BE REPLACED. THE BLACK VALVE THAT WAS THERE FROM ROADTREK BROKE.) (There is no red valve in the photos.) The large red valve handle on the floor - not in these photos has nothing to do with the hot water heater.) SO - the answer to your question "Yes?" is "NO!" IN BYPASS - two valves are CLOSED (top and bottom) and one valve is OPEN (middle). This shuts off water flow into and out of the hot water tank and allows cold water from the tank to flow into the hot water pipe of the faucet or shower so that when in bypass the water will flow cold when you turn on the hot water faucet side. WHEN NOT IN BYPASS - YOU want HOT WATER - the two valves - top and bottom are OPEN - and the middle valve is CLOSED. It is closed so that cold water from the bottom pipe does not go up and mix in with the hot water that comes from the tank into the top pipe and goes to the hot water pipes to put hot water into the sink or shower. As explained in the article - cold water comes from the pump or city water hose, goes into the hot water tank through the bottom pipe and valve, the hot water tank fills or refills with cold water which is heated in the tank. When a hot water faucet is turned on the hot water exits the tank through the top pipe and valve. The middle valve is closed and that pipe is not used when the tank is set to hot water use. It takes a little time to understand the logic to this arrangement. If you did not have the middle pipe and valve - when in bypass as this system is designed when you turned on the hot water side of the faucet you would get nothing - no water at all. This way you get cold water from both the hot water and cold water faucet sides. Why? If you were still using the sink you might as well have the benefit of both sides of the faucet to use - PLUS when winterizing you are able to get RV antifreeze into the hot water pipes and faucet valves - which would freeze in the winter if you had no way to get RV antifreeze into them.

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  2. Hello, do you happen to know the part number of the out side cover for the water heater? Mine fell off and need to replace it asap. Thanks.

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    1. I do not know the part number but I do know that several have found it on Amazon It is a Suburban 6 gallon, propane hot water heater with direct ignition. Once you get your new cover - check out our article on how to prevent losing it.

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