Maybe someone can help me with a problem with my raypak 336 heater . Its a year old ran great all last year started it up this month I had flame roll-out and had to replace the rollout thermal coupler. Before starting it back up I pull the burner assembly nothing was dirty at all I also took my camera and took a photo of the heat exchanger to dee if it was blocked by soot i can still see the cooper color on the fins so it wasn't blocked. I put the burner assembly back in and started the heater same thing happened roll out . The burner flame is yellow not blue doesn't look like there's a lot of pressure could the gas valve be bad and not opening all the way?
Raypak heater
- Thread starter lobo56
- Start date
swamprat69
Well-known member
It is doubtful that the gas valve is partially opening.Check the insides of the burners for spider webs first. Check the orifices (brass inserts with a hole) on the gas manifold ( U bend pipe coming out of the gas valve to feed the burners ) and try cleaning with a pipe cleaner or removing the gas valve and manifold by opening at the pipe union before the gas valve (after shutting off the gas feed), removing the valve/manifold mounting brackets and completely removing the orifices to inspect for blockages ( spider webs/dirt) as a last resort. If everything is clear in the burners and orifices you would then need to check the gas supply pressure.
Thanks , I pull it apart again and go further into it this time like you said. I was sort of counting out the gas supply pressure from the meter since it ran perfect for the first season.