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Thread: Heater not heating past 94*, tips on maintainance?

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    Heater not heating past 94*, tips on maintainance?

    I have Purex Triton Minimax 350 heater which wasn't used much last season. I noticed it was slow to heat last season, the few times we used it. Now it won't get past 94* even after a couple hours run time.
    My thoughts are to check and clean the jets to make sure they are burning correctly, and I suspect the heat exchanger may be partially blocked due to calcium buildup. My water is not particularly hard, but I would bet the heat exchanger has neven been cleaned in it's 11 year lifespan.
    I've never done either of these things so any tips will be appreciated. I will try to find the manual online, and I will do some more searching here to see what others have done.
    I think I'd need to remove the exchanger and dip it into a strongish MA solution to clean the scale from inside it? And you'd want a nice blue flame from the jets, similar to what I look for on my grill?
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Re: Heater not heating past 94*, tips on maintainance?

    Manual can be found here: http://www.pentairpool.com/pdfs/MiniMax ... rMaxIG.pdf
    Wish I could find the pdf I had saved on my last laptop, that link takes forever to load.
    Does say I'm looking for a blue flame.
    Found that a new heat exchanger is nearly $600. All the more motivated to repair rather than replace.
    edit-Adobe Reader X threw me for a loop, but I finally saw how I can save a copy onto the laptop.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Re: Heater not heating past 94*, tips on maintainance?

    And just to make sure the simple things are out of the way, the propane tank is verified 65% full, and the burners are lighting off and flowing evenly.
    I did see that there is about 1/2" of blue flame at the bottom with 2" or so yellow flame above that. So cleaning the burners is first on my list.
    The knob is set to max temp on the unit itself.
    Guess I can go to bed now.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Mod Squad JohnT's Avatar
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    Re: Heater not heating past 94*, tips on maintainance?

    I can't help, but I know I've seen this problem discussed before. Search didn't give me anything though.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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    Re: Heater not heating past 94*, tips on maintainance?

    Was kinda hard for me to find good search results too.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Mod Squad JohnT's Avatar
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    Re: Heater not heating past 94*, tips on maintainance?

    Quote Originally Posted by shellsingleton
    Was kinda hard for me to find good search results too.
    Be sure to use the Google search at the bottom of the page for best results.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Heater not heating past 94*, tips on maintainance?

    Aha! That may help.
    Right now the plan is to find a good wire "bottle" type. Rush to clean the inside of the burners and use my other wire brush to clean the outside.
    Is it common for the outside of the exchanger to need cleaning?
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    spishex's Avatar
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    Re: Heater not heating past 94*, tips on maintainance?

    Is there still water spilling over into the pool when the spa is heating?

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    Re: Heater not heating past 94*, tips on maintainance?

    No, valves are synced correctly. Good question tho, that would have done it.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Re: Heater not heating past 94*, tips on maintainance?

    Have you verifyed that the heater is running the whole time, or is it running, then shutting down, then starts again and repeats?
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    Re: Heater not heating past 94*, tips on maintainance?

    Will verify that this afternoon but I'm pretty sure that it runs constantly when told to.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Re: Heater not heating past 94*, tips on maintainance?

    Quote Originally Posted by shellsingleton
    I have Purex Triton Minimax 350 heater which wasn't used much last season. I noticed it was slow to heat last season, the few times we used it. Now it won't get past 94* even after a couple hours run time.
    My thoughts are to check and clean the jets to make sure they are burning correctly, and I suspect the heat exchanger may be partially blocked due to calcium buildup. My water is not particularly hard, but I would bet the heat exchanger has neven been cleaned in it's 11 year lifespan.
    If you had build up on the inside or "water side" of the exchanger, the heater would probably bang or make some ruckus then shut off(overheating) and then try to start up again. If you had sooting on the outside you would get flame roll out blowing a fuse or get hi limit disconnect and again, the heater would shut off.
    I've never done either of these things so any tips will be appreciated. I will try to find the manual online, and I will do some more searching here to see what others have done.
    I think I'd need to remove the exchanger and dip it into a strongish MA solution to clean the scale from inside it? And you'd want a nice blue flame from the jets, similar to what I look for on my grill?
    Do you have solar by chance? If it were night time when trying to heat, and had the solar turned on (would have to be manual solar control) you would be sending the water up to the roof and getting cooled by maybe 4 degrees, then run through the gas heater and warming it up about 4 degrees, i.e. spinning your wheels, and getting not much heat past a certain point. Just a thought
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

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    Re: Heater not heating past 94*, tips on maintainance?

    I didn't get a chance yet to verify that it runs constantly, will do that late tonight after the fam's gone to bed.
    I don't have solar. Wish I did, I think it would do alot to extend the season this far south.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Re: Heater not heating past 94*, tips on maintainance?

    When you turn it on but do not put the blower on, are there a lot of bubbles in the spa?

    We recently fixed a suction side air leak that kept the heater from staying on and heating.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: Heater not heating past 94*, tips on maintainance?

    I don't have a blower, the jets pull the air in with my setup. Water pressure, etc seems normal. I will get out there in a few and see if I can't clean the burners/verify continuous operation.
    7x7 spa drains>16K IG, Gunite/Plaster, Compool 3600, Purex Triton Minimax Plus 350, Sand Filter, 8 Gal Liquidator

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    Re: Heater not heating past 94*, tips on maintainance?

    In our case, although the first sign of an air leak was unexpected bubbles in the spa, we also saw a lot of bubbles in the site glass at the pump. There should not be any bubbles there.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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