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Old 10-04-2014, 01:44 PM   #11
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Next time you have an empty tank, weigh it (also, the empty weight should be stamped on the handle somewhere). Then, when it's convenient, remove and weigh the tank you've been using, and when it's down to a few pounds left, switch to the full one, and get the light one refilled.

It's not easy, but at least you won't wake up cold in the middle of the night.
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Old 10-04-2014, 04:30 PM   #12
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I had this same question, just got a new Jayflight and have been us ring LP for refer and water heater, thanks for the input everyone!! One other question I have is after you do run out of the one tank, when you switch over to the other, is there anything you have to do other then switch tanks? Will everything start automatically? Thanks!!!
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Old 10-04-2014, 05:19 PM   #13
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My experience with Marshall automatic changeover propane controls has been very positive for the last 13 years; in that time, I've had two different trailers each with the same type Marshall automatic changeover controls. I always leave both tanks on and simply check frequently the green/red indicator. So far, it has switched over without fail.

It looks like Marshall is no longer making them, someone else is according to this ad:
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Old 10-04-2014, 05:22 PM   #14
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The controls will automatically switch over without an interruption of gas supply, but the "spare" tank does not have quite the same BTU output available as the "main" tank; just flip the switch when you can.
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Old 10-04-2014, 05:45 PM   #15
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Quote:
Originally Posted by RVhiker View Post
My experience with Marshall automatic changeover propane controls has been very positive for the last 13 years; in that time, I've had two different trailers each with the same type Marshall automatic changeover controls. I always leave both tanks on and simply check frequently the green/red indicator. So far, it has switched over without fail.

It looks like Marshall is no longer making them, someone else is according to this ad:
I've never had any problem with the Marshall ones either. I have always done the same as you do and then switch the regulator over to the full one when I notice the primary one empty and get the empty one filled unless I'll be coming home in a day or 2. The regulator the new Jayco's come with is this one. It also seems to work fine so far.

http://www.rvwholesalers.com/catalog...LAEaApC98P8HAQ

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The controls will automatically switch over without an interruption of gas supply, but the "spare" tank does not have quite the same BTU output available as the "main" tank; just flip the switch when you can.
I've never seen that. I've been able to run the furnace, water heater and stove on the spare tank with the switch still on the empty primary one.
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Old 10-04-2014, 06:50 PM   #16
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That business about the reduced propane flow on the reserve cylinder was a surprise to me, too, when I read it; I've never had an issue with the supply when using the reserve cylinder, either. I can't find a PDF to link to show what I'm talking about, but I do have a copy of the printed version. It says that the "service" cylinder can supply 210,000 BTU per hour, and the "reserve" can supply 130,000 BTU per hour; all of which actually makes no difference to most folks in using the product. And when one cylinder runs empty, all you have to do to make the "reserve" cylinder the "service" cylinder is to flip the switch.
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Old 10-04-2014, 07:06 PM   #17
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The new regulators in the Jayco's are rated at 160,000 BTU/hr. It doesn't give 2 ratings. Even at 130,000 BTU/hr, it would be unlikely to get near this. The biggest furnaces are normally 40,000 BTU/hr. I had a motorhome with 2 furnaces - 30K and 15K. Water heaters are normally 10,000 BTU/hr and all 3 stove burners about 21,000 BTU/hr. So 2 furnaces + water heater + 3 burners = 76,000 BTU/hr. Even with a 50K demand water heater the total would only be 116,000 BTU/hr. I guess that's why we never noticed the reduced output.
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Old 10-04-2014, 09:28 PM   #18
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I filled the empty tank at the CG today and put it back on and noticed the lines leaking in two different places. So that tank is shut off until I get the lines replaced.
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Old 10-04-2014, 09:38 PM   #19
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Another question. Do both tanks draw down at the same rate? So if I use one tank until near empty then open both tanks it should drain the one empty and then just work off the other. Does this make sense?
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Old 10-04-2014, 10:25 PM   #20
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Some of y'all are making this more complicated than needed.

The system is designed to switch between two open tanks. There is a gauge that reads whichever tank it is pointed to. When that one empties the regulator switches to the other unit automatically and shows empty on the gauge.

Turn that tank off, turn the switch to the other tank. Take the empty tank and have it filled. Hook the now full tank up and turn it on. When the other tank gets empty it will switch to the now full tank do it all over again. I check the tanks once or so a week, I’ve never run out.

We shut both tanks off when we get home, turn them on when we get ready to head out.
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