Aah. It's gas. The 750mv makes more sense now. I figure you're trying to hook up the gas control valve. You should have a supply, some sort of controller, and the valve. If you wire them in series, they should work. However, I'm running off very little information. If I knew what exactly you had (As in the electric devices you are trying to wire) I could go into more detail.
I cannot find a current listing for Teledyne Laars. As far as I can tell, Teledyne and Laars separated, Laars joined up with Waterpik and then got reorganized under Jandy. www.jandy.com now has the Laars Lite2 line of pool heaters with the LG model almost identical to the Teledyne Laars LLG. You can access the manual at http://www.jandy.com/pdfs/H02359-.pdf . Jandy also has a parts list for older discontinued models.
Most likely one or two of the burner orifices near the pilot light are clogged making the gas travel a distance before lighting. Pull the burner tray and clean it completely. And check for spider webs and other debris in the burners. Check for other gas leaks, and don't use flex lines, flanges, valves, or other fittings inside the heater. On the Series One, check the sidewalls to make sure they are intact.
I cannot find a current listing for Teledyne Laars. As far as I can tell, Teledyne and Laars separated, Laars joined up with Waterpik and then got reorganized under Jandy. www.jandy.com now has the Laars Lite2 line of pool heaters with the LG model almost identical to the Teledyne Laars LLG. You can access the manual at http://www.jandy.com/pdfs/H02359-.pdf . Jandy also has a parts list for older discontinued models.
Try this link www.jandy.com Ken
Check that you are getting voltage from the thermocouple. You should see about 600 millivolts.
go to their website and support and download it
You might want to try Jandy.com k
Try google Jandy.com
You can find every part you need for your boiler at gasboilerspareparts.com
I was told by Teledyne Laars that your pilot generator needs to produce at least 500mv to open the gas valve. Mine makes 350mv and will not open the valve. Hmm, I think that should be nearer to 600 mv - 700 mv.
Write or inquire thru that web site for a manual to be sent to you. k
Pool heaters are needed to help keep the pool water at a comfortable temperature. A Teledyne laars series 2 model esg pool manual is usually available with the manufacture.
Probably a bad sensor. Have a professional diagnose the problem. It can be very dangerous for untrained to work on gas appliances.
From what I have read, 500mV is not enough to keep the pilot light lit. Here is what I read on a different site: "You can check if this is the problem by measuring the voltage on the wires coming back from the pilot. When you have the red switch depressed, check the voltage (should be about 200mV). If there's no voltage, then change the thermocouple. The thermocouple will generate up to 750mV in a pilot flame. If it falls below 550mV it should kill the fuel source." Hope this helps.