Question about Jandy Laars Lite2 Ld 400,000 Btu Heater
The heater water system is leaking and doesn't allow the pool to prime. I was looking for a way to bypass the heater and isolate it from the pool.
The pool return pipes are connected to the heater with pipe unions. You could get a set of unions to match them and make a "U" shaped pipe section to bypass the heater. using a couple of 90's and the unions .
Posted on Jun 01, 2010
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Posted on Jan 02, 2017
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If you have an external by-pass it needs to be closed. An external bypass is simply a valve (or two) that direct the flow away from the heater. This valve is usually between the pipes on the in and out of the heater. When you close it (closing the bypass), water is forced through the heater. When it is open (open the bypass) no water goes through the heater, or if you leave the valve partially open, then only "some water" goes through the heater. So if you open the bypass (directing water away from the heater) or only have it open part way, the water in the heater boils and turns to steam. With no where to go it starts banging and knocking.
If you close this valve,or it is already closed, and you still have trouble, then we can identify that the internal by-pass has gone bad. The overheating from the improper placement of the valves may cause additional damage to the internal bypass.
Some additional questions to consider:
Q: Does the banging continue until the heater eventually shuts off or does it quit shortly after the heater burners start up? I
POSS. DIAGNOSIS: n either case you can repair the heater for much, much less than a new unit. The bypass may be the issue if it is stuck closed or has been damaged as noted above.
Q: What is the pressure on the filter?
POSS DIAGNOSIS: It is also possible there is an issue with the pump and/or filter not allowing enough flow thru the heater. Poor flow may be caused by a clogged or damaged impeller, suction leaks allowing too much air into the system, or the filter needing service and not allowing enough water to pass through to the heater.
In all cases, I suggest inspecting all components of the system, servicing the filter with a back wash, filter clean and DE recharge (depending on applicability of your situation).
It seems like a lot, but most of the time, the issue is a very simple....there are just a lot of components to simple answers!
--The Ugly Pool Guy
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