Question about Pentair Minimax Ch 400,000 Btu Propane Pool Heater Millivolt Ignition

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I just cleaned my jets on my purex mini max plus 400 heater. It is heating great now but has black smoke coming from the top. I think it is rich and is getting too much gas. Is there an adjustment or do i need a new gas switch?

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First have you always had this connected to propane? There are different models for natural gas and for propane.If you connect a natural gas to propane the "jets" are way too big for propane. How did you clean the jets? IF you "drilled" them out they may be too large now. If you have adjusted the gas regulator, decrease gas pressure. I believe this unit has a combustion blower, be sure it is debris free on inlet and in fan, check for leaves. Make sure black smoke is not coming from debris built up inside of heater. Here is a link to a location for the complete manual for your heater:

Posted on Jul 05, 2010

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