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I need a users manual for a Roca Laura 20/20 gas heater

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Posted on Jan 02, 2017

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SOURCE: Need manual for Murray 20'' 3.5 hp lawn mower

sounds like its running out of gas. I changed spark plug, still sounds like its about to die

Posted on Apr 29, 2010

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My SR400na fires up and and produces heat for 20 - 30 seconds then shuts off. The pool repair people said it was due to not enough Gas presure. It needs 4 wc and when it fires it drops to 2.8 wc. The gas...

These heaters don't work so much on gas pressure anymore. They still need 4-7 inches but they need the volume to maintain that pressure. rather than let it drop after firing. For a 400,000 BTU heater you will need for any more than 30-40 feet of run at least a 1.5 - 2 inch supply line. You will want to stay to the large side on this as it may br supplying other appliance's also such as gas dryer's or home heaters. You should check the size of your meter and make sure it is at least a 400,000 also or it supply enough gas to the supply line. I have had a lot of gas people tell me I don't need to up grade. They are not wrong just mistaken. I would trust the pool guy as this is what he does. It is just a small part of the gas business.
A second opinion would also be in line as what you describe could also and more often be a water flo problem. If you have an external by-pass that is open so the water goes past the heater but still supplies enough pressure to fire the heater the heater will fire and over heat the water inside the heater. That shuts it down, it gets fresh water and starts again, just to cycle again and again. Problems with the internal by-pass will do this also along with a dirty filter basket or impeller.
The new gas line is $$$ so I would start with the water flo things. Check the size on your meter next. The gas company will do this for nothing as they will sell more gas with this. If the service man says no get a supervisor. Then lastly go for a new gas line if necessary. Good luck.

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Need manual for Murray 20'' 3.5 hp lawn mower

sounds like its running out of gas. I changed spark plug, still sounds like its about to die

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1 Answer

I am looking for a replacement cartridge for a Roca Pasific bath mixer tap

Try The Faucet Parts store out of Arlington, TX. They specialize in faucet replacement parts. Their number is 817-649-8919. I bet they would be more than happy to ship you what you need.

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