Sunline RV Forum
Sunline User Photos

Go Back   Sunline Coach Owner's Club > Technical Forums > Repairs and Maintenance
Click Here to Login

Join Sunline Club Forums Today


Reply
 
Thread Tools Search this Thread Display Modes
Old 10-11-2009, 08:12 PM   #1
Moderator
 
JohnB's Avatar
 
Join Date: Nov 2006
Location: Ohio
Posts: 10,145
SUN #89
JohnB is on a distinguished road
LP Auto Change Over Regulator Explained

Many if not most TT’s with dual LP gas bottles now a days have an Auto Change over LP gas regulator. This device makes our life easier in the middle of the night when it’s really cold out or a during a torrential down pour and the LP tank we where using just went empty. It switches over to the other tank automatically for us and gas service is unaffected.

There can be a lot of discussion some times on, do we use these, don’t want to use these because... and how to they work? And if you are like me, until you read up on these things and see them working, you really do not know how they work. And sometimes after reading, one still has questions. Since this auto switch over regulator operation comes up from time to time, I thought I would attempt to explain how the systems works from the way I know it and how I use it. Anyone seeing anything not posted correct here, please jump in and help us sort it out.

Mine just switched this past weekend and saved me from getting up in the middle of the night to go out and change tanks. And we have another post by Happy Campers where questions came up on how are they suppose to work, so here goes.

Here is picture of the auto switch over regulator


The regulator is actually a 2 stage regulator where the 1st stage takes full tank gas pressure that can be up in the 100 to 150psi range in the summer down to about 5 to 7 psi pending the exact model. Then the 2nd stage regulator takes it down to 11 inches of water column pressure or approx 0.5 psi to use inside the TT. The 2 stages help make it more stable across a wider range of fluctuations.

It also has internal check valves and a selector lever where it can join 2 tanks and allow you to select which tank works as the “in service” tank and the “in reserve” tank.

On top of the regulator is a colored indicator below the black cap. The cap stays on normally. It has a red and green color showing below the black cap. When the tanks are hooked up and still turned off, the indicator is red indicating no gas pressure or not enough, is detected inside the regulator:

See here for the Red indication.


Now you have to select which tank you want to use first. So you flip the selection lever until the knob of the lever is on that tank side. In this pic, the lever is towards the hose that I want to use that tank first as the “In service” tank. By default the other tank is then the "in reserve" tank.


I then open the in service tank 1st, watch the indicator move to green and then open the reserve tank. Or I can just use the in service tank if I only want to use one of them for a short time. Slowly the gas pressure will rise and the red indicator will turn green if the in service tank has adequate LP gas in it. Looks like this:


I always wait once I turn on the in service tank for the green indicator as if that tank is empty, it will never turn green and then I know I have an empty at the start of camp.

As the in service tank drains down to empty from use, and if the reserve tank valve is open and has adequate gas, the system will auto switch over inside to the reserve tank. Note: The selection lever is still pointing to the empty original in service tank that is now empty. The reserve tank now become the in service tank. The indicator will show red as the tank that the selection lever is pointing to is empty.

You then flip the selection lever over to the full tank and it is now the new in service tank. If the selected tank has enough gas and pressure in it, the indicator will then turn green once again. If not it too will show red.

There are check valves in the regulator to allow you to remove the empty tank, refill it and then put it back in service even while the other tank is using gas. But only do so once you flip the selection lever and the indicator goes green.

Extra Notes: If a switch over occurs and the tank it is switching to is empty, (now you have 2 empty tanks ) the indicator will remain red when you flip the lever.

The debate has been that if you use this system in full automatic that you forget about it and then you can come up with 2 tanks that are empty at once as there is no alarm. Some combat this by only opening 1 tank at a time. This works but can also be cold in the middle of the night or your fridge stops working if your on LP mode or the power goes out.

What I do is monitor the tanks often and track my gas use. Unless the furnace is running, we do not use very much gas on only the fridge, stove or HW heater. I always start using the tank that is selected and see if it turns the indicator green when we start camp. If it is, then I turn on the 2nd tank. An empty tank at the start will show red and then I know it.

A tank can last us several months. But when using the furnace, I check every morning. I also look down the side of the tank for condensation when the furnace is running in cool weather. I can tell how much is approx in it. When it gets close to 1/4 full, it might switch that night if the furnace is on. Every morning then I do a quick check on the tank indicator and if I’m green, I’m good for another day. If it is red, then I know next camping trip I have to get it filled. Or if the trip is a long time, get it filled in the next day or so.

The key to not running out is you have to be diligent about looking at the level. If you do not check, well you can end up with 2 empty tanks.

See this link for the Marshall Brass auto switch over regulator and more info. It has 4 links on there that show how it works and how to test it. http://shleggitt.com/edlees/index.html

While we are on LP service, the green nut that screws the pig tail hose to the tanks is also a safety device. It will only allow so much gas to flow pending it’s size. The black nut is for smaller systems like a BBQ, the Green nut is larger like the entire TT and a Blue colored nut is even larger then a TT. If a large hose leak or gas valve breaks and opens a large surge of flow, the black/green or blue nut will shut down gas flow to a trickle as a safety device. Since it does this, there are 3 different sizes for different usages so you do not get false trips.

Hope this helps

John
__________________

__________________
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC

Google Custom Search For Sunline Owners Club
JohnB is offline   Reply With Quote
Old 10-18-2009, 08:00 PM   #2
Junior Member
 
Join Date: Jul 2007
Posts: 9
SUN #355
ckayakers
Perfect Timing

Thanks John!
We just got back from 5 night, a very cold and windy Columbus Day trip to So. Maine. Gained a lot of respect for the Sunny, kept us warm and cozy. First time really using the furnace so I kept worrying about running out of gas. An auto switch-over valve has moved WAY up my wish list! After this past trip, we are thinking we could get another month of camping on each end of the season if we wanted to.
BTW 495 in Mass. was a nightmare in both directions, especially on Monday.
__________________

__________________
'07 T 2363 #7183
'85 1280 Rockwood Pop-up
Wife/Nav. Connie - cclassy
04 Toyota 4Runner V8 "Sport Edition"
http://picasaweb.google.com/ckayaker...80958805419618
ckayakers is offline   Reply With Quote
Old 10-18-2009, 08:21 PM   #3
Moderator
 
JohnB's Avatar
 
Join Date: Nov 2006
Location: Ohio
Posts: 10,145
SUN #89
JohnB is on a distinguished road
Re: Perfect Timing

Quote:
Originally Posted by ckayakers
An auto switch-over valve has moved WAY up my wish list! After this past trip, we are thinking we could get another month of camping on each end of the season if we wanted to.
Hi Ckayakers,

Thanks for the thanks. Now to your statement: On your wish list? Are you saying there is not one on your 2007 camper?

I didn't think Sunline made any newer ones with out them. Or somebody took it off. To upgrade, they really do not cost that much.

Glad you had a good time out. Yes, we cold weather camp too.

John
__________________
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC

Google Custom Search For Sunline Owners Club
JohnB is offline   Reply With Quote
Old 05-11-2012, 11:35 AM   #4
Junior Member
 
Join Date: Mar 2012
Location: New York
Posts: 9
SUN #3477
pjmtns is an unknown quantity at this point
has anyones gauge stopped working? filled a tank today hooked up ,opened tank switched lever to full tank and guage still reads empty????
__________________
pjmtns is offline   Reply With Quote
Old 05-11-2012, 03:29 PM   #5
Moderator
 
clueless campers's Avatar
 
Join Date: Dec 2007
Location: Ohio
Posts: 708
SUN #481
clueless campers is an unknown quantity at this point
This thread may help.
__________________
http://i629.photobucket.com/albums/uu12/cluelesscampers/SigSmall.jpg
1997 Sunline Solaris T-2363, Leaf Green Interior
2004 Ford F-150 5.4L V8
clueless campers is offline   Reply With Quote
Old 05-11-2012, 04:06 PM   #6
Junior Member
 
Join Date: Mar 2012
Location: New York
Posts: 9
SUN #3477
pjmtns is an unknown quantity at this point
yep

saw that one thanks. Problem is now have discovered gauge works for left tank and not the right,,switched tanks ect... definitely not functioning for right hand tank.
__________________
pjmtns is offline   Reply With Quote
Old 05-13-2012, 08:32 PM   #7
Moderator
 
JohnB's Avatar
 
Join Date: Nov 2006
Location: Ohio
Posts: 10,145
SUN #89
JohnB is on a distinguished road
Quote:
Originally Posted by pjmtns View Post
saw that one thanks. Problem is now have discovered gauge works for left tank and not the right,,switched tanks ect... definitely not functioning for right hand tank.

Hi pjmtns,

H'mm, maybe try unhooking the right tank and screwing the green knob back on again. It may not be seated enough to let the gas flow. If that does not work then try switching tanks to see of the problem moves (maybe a tank issue) or it does not. If that right side is still a problem, then it may be the switch over regulator or the green ACME nut has issues.

Hope this helps

John
__________________

__________________
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC

Google Custom Search For Sunline Owners Club
JohnB is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Book on Auto Manufacturing/Mass Production (Winter Reading) Mark Sunline Community 4 01-03-2010 11:17 AM
Bad LP Regulator??? HappyCampers Sunline Community 5 10-12-2009 06:40 PM
Lets Bail Out Wall Street, and the Auto Makers... HappyCampers Sunline Community 0 01-26-2009 04:53 PM
LP Regulator chuck & lori Repairs and Maintenance 3 04-02-2008 11:30 PM


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Sunline RV or any of its affiliates. This is an independent, unofficial site.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 08:21 PM.


×