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Thread: Hayward heater H100ID thermostat installation

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    Hayward heater H100ID thermostat installation

    At the end of the season our heater started to leak around the thermostat. On further investigation, I cannot determine what holds and seals the thermostat into the heater manifold. I can pull the thermostat out of the manifold and reinsert it but there is no evidence of anything that seals it into the manifold so I don't know how to fix it. Any help out there?

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    Re: Hayward heater H100ID thermostat installation

    It sits in a well. The well is part of the manifold. This is likely what is leaking, not the bulb of the thermostat. The manifold is part of the heat exchanger assembly according to the drawings and part listings.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Hayward heater H100ID thermostat installation

    Thanks, I know the bulb isn't leaking. The manifold is not leaking. The water is coming out around the bulb because there is nothing to seal the bulb into the opening in the manifold where the bulb resides. I'm missing something, just don't know what.

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    Re: Hayward heater H100ID thermostat installation

    The bulb sits in a well in the header normally. There may or may not be thermal paste for improved heat transfer, usually not.

    The H100 is the smalled gas fired unit Hayward makes, AFAIK. It has a different design than everything other gas heater Hayward made for the last 15 years. I don't see them much since I primarily work on I/G pools and this unit is meant for AGPs and spas.

    It may be getting it's temp readings via contact with the intake, wouldn't surprise me a bit. If this is the case, and you see water, it's likely condensation. Every other gas fired pool heater I have worked has had a well that the bulb sits in, The well makes contact with the incoming water and the bulb makes contact or is in close enough proximity that little heat is lost and the thermostat can make a reasonably accurate reading.


    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Hayward heater H100ID thermostat installation

    The link will show all the parts of the thermostat assembly. The bulb fits LOOSELY into the opening in the heat exchanger and this is what I am talking about in my post. Water gushes out of the opening when the pool pump is on. I do not know what the piece is that looks like a pen clip. Something has to seal the bulb in the heat exchanger and this is what I don't understand. By the way, this heater does a great job on my 24' inground.
    http://www.parts4heating.com/PhotoDetai ... IDXTST1930

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    Re: Hayward heater H100ID thermostat installation

    The bulb well is threaded into the header. If water is coming out, then the bulb well is damaged or the threads need to be resealed. The bulb well needs to be unscrewed and examined. If it is damaged, then it should be replaced. If it is intact, then it can be rethreaded into the heater using Teflon tape or thread sealant to seal the threads.

    The bulb sits in the well and is not sealed. The pen clip is a retaining clip to hold the bulb securely in the well.

    I think that the bulb well part number is HAXTBW1930 (Bulb Well, Cotherm)


    http://www.1800pools.com/CHXTBW1930_Hay ... _Well.html

    http://www.hayward-pool.com/pdf/Parts%2 ... Series.pdf

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    Re: Hayward heater H100ID thermostat installation

    Thanks for the reply, however. there is nothing that resembles the bulb well nor a place for it in my heat exchanger. The opening that the thermostat bulb slides into is perfectly smooth on the inside and very thin, to thin to thread. Any one have a photo of what the assembled parts look like?

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    Re: Hayward heater H100ID thermostat installation

    Like I said, the H100 is a different beast.

    Are you sure it isn't condensation? As I said, the drawings I have in two different Hayward parts books don't show the well most of use are used to seeing. I have to assume it has some clip to press it against the water feed from the filter. If there is a leak there, it's be at the clip or a dribbling from a leaking heat exchanger/manifold.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Hayward heater H100ID thermostat installation

    I took pictures of my unit, however they are too big to upload. If anyone wants to send me their email address, I will forward the pics.
    billsblue68@aol.com

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    Re: Hayward heater H100ID thermostat installation

    Post them at Photobucket and post a link here.

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    Re: Hayward heater H100ID thermostat installation

    Or use the 4th option on photobucket to post it in the msg box so it shows without taking TFPs disk space.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Hayward heater H100ID thermostat installation


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    Re: Hayward heater H100ID thermostat installation

    I haven't seen that model before. It looks like the copper has corroded through. You're going to have to do a little bit of disassembly to get that part out and replace it. Based on the parts diagram, it looks like you might have to replace the entire heat exchanger.

    http://www.hayward-pool.com/pdf/Parts%2 ... Series.pdf

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    Re: Hayward heater H100ID thermostat installation

    Yup. The well is built in to the heat exchanger assembly.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Re: Hayward heater H100ID thermostat installation

    ok, so again my question is what holds the bulb into the heat exchanger and seals the water from pouring out?

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    Re: Hayward heater H100ID thermostat installation

    The well is soldered/brazed in. It is non removable. The copper tube, bent properly holds the bulb in the well. The bulb doesn't make direct contact with the flowing water. If water is coming out the well, it's shot.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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