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Post Info TOPIC: It finally happened to me ... RV dreams to the rescue


RV-Dreams Family Member

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It finally happened to me ... RV dreams to the rescue


We have a Truma Aqua Go water heater (love it).  Our automatic switch on our two propane bottles switched, but never showed the red indicator ... resulting in BOTH tanks being sucked dry.  Always happens when the shower is going ... so I got both bottles filled, opened the valves and turned the Truma on ... got the exhaust fan and heard the ignition, so I thought we were back in business.   But after a few seconds the water got cold and I checked the Truma ... it seemed to be working properly.  Then I remembered that if you open the LP tanks too fast it causes a safety valve to stop the flow.  Asked DW to light the oven ... pilot would light, but when she tried to get the burner to light, it went out.  RV Dreams lesson to the rescue.  I went outside, closed both bottles and then opened them S L O W L Y.  Bingo ... the Truma began to work, hot water flowed freely, the sun came out and a rainbow appeared ... not really, but the Truma began to work.  Been FT for over 2 years and this was the first time this has ever happened to me, but it can.  Glad I remembered that lesson which I learned here.  Thanks.



-- Edited by RonC on Monday 12th of November 2018 03:41:12 PM



-- Edited by RonC on Monday 12th of November 2018 04:44:28 PM

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Ron and Janice

 

2016 Ford F350, King Ranch, DRW, 3.73's, 4x4, CC, 6.7 Powerstroke, remote control air lift system

2017 Durango Gold 381REF (41 ft, 5 slides), MORryde IS, 8K Disc brakes, GY G114  LR H Tires, 27,320 lbs CGVW

Full Timers class of 2016



RV-Dreams Family Member

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Good reminder lesson for everyone.

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Winnebago TT 2101DS & Tahoe LTZ, 300 watts WindyNation solar-parallel w/MPPT, 2 Trojan T-125s. TALL flag pole. Prefer USFS, COE, BLM, USF&WS, NPS, TVA, state/county campgrounds. 14 year Army vet-11B40 then 11A - old MOS 1542 & 1560.



RV-Dreams Family Member

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Thanks for paying the tip forward. Never knew that..

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Mark from Missouri

 www.ourfutureinanrv.wordpress.com



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Actually, the combination of turning the propane on slowly AND not having any propane appliances on provides the solution. Here is the detailed, more technical explanation from the RV Doctor, Gary Bunzer. 

"Let’s talk about a couple of safety features on these new pigtails. Both features are parts of the big green nut.

The first is a black thermal-sensitive bushing found just behind the green nut. If this bushing is ever in a fire with temperatures between 240°F and 300°F, it melts and allows the brass nipple inside the nut to move back about ¼ inch, which closes a small piston inside the cylinder valve totally shutting off the flow of propane. This innovative feature will help prevent fires or explosions.

The second new safety feature is called a “flow-limiting-device.” Its purpose is to restrict the flow of escaping gas if there is an excessive leak in the RV propane system. This second “flow-limiting-device” feature and how it works forms the core of the secret! Almost every time the cylinder valve is opened, a small ball in the center of the brass nipple (inside the green nut) is pushed forward into a brass seat. This seat doesn’t totally shut off the gas. By design, it allows a small amount of gas (by-pass flow) to go into the RV propane system. If everything in the propane system is closed and in the off position and there are no leaks, the by-pass flow builds up a back pressure. This equalizes the pressure in the ball back of the seat and allows unrestricted flow through the system. All this happens in about five seconds and the user doesn’t know it’s happening, appliances light, furnaces and water heaters run as normal.

Now lets look at the same system but with the oven control left in the pilot on position. Again the cylinder valve is opened, the ball is pushed into the seat, the by-pass flow goes through the system but this time it can’t equalize because the flow continues out through the open oven pilot. The user goes inside and starts cooking dinner. Two burners on the range top are lit and everything seems okay until the furnace comes on. At that point, the flames on the range top are drawn down and the furnace won’t ignite, everything seems starved out. The reason? We don’t have full-unrestricted cylinder flow to run our system, we only have the small by-pass flow which is far too small to feed the appliances trying to operate.

HOW TO FIX THE SITUATION: Turn off all the appliances, turn everything to the closed and off position, wait about 15 seconds. If the system is closed and tight, the back pressure builds up, equalizes and feeds unrestricted cylinder flow to the regulator for normal operation."

And if you still have problems with propane, consider replacing the pigtails with the big green nuts with pigtails that have a big red nut (fairly new, but they are approved for RV use and allow double the output) as this may help your propane flow issues, especially if you have propane cylinders on opposite sides of the rig.



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RV-Dreams Family Member

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Thanks for the more comprehensive (and educational) explanation. The slight flow explains why our stove’s pilot light would light, but the main burner would not. The need to build up back pressure to equalize the pressure is a great tip. See ... still learning at RV Dreams😉



-- Edited by RonC on Thursday 6th of December 2018 05:51:01 PM

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Ron and Janice

 

2016 Ford F350, King Ranch, DRW, 3.73's, 4x4, CC, 6.7 Powerstroke, remote control air lift system

2017 Durango Gold 381REF (41 ft, 5 slides), MORryde IS, 8K Disc brakes, GY G114  LR H Tires, 27,320 lbs CGVW

Full Timers class of 2016

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