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tap water 160*

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lee_7
lee_7 Member Posts: 458
Hi limit is for home heating and low temp is the stand by temp for boiler untio call for heat. It also keeps boiler hot enough for your domestic hot water. Like everyone said, if you do not have a anti- scald valve in your domestic water, you should have one installed asap for your family's safety.

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  • ken D
    ken D Member Posts: 60
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    tap water 160*

    tap water 160*

    boiler for baseboard heat and h. w. coil for domestic drinking water...

    Believe its a triple aquastat, hi (180), low (160) and diff set at 20*

    If I lower low setting, boiler shuts off at 160* when should be 180*

    Is it bad aquastat? What sets domestic water temp--low setting or is that for heating house?
  • Eric Johnson
    Eric Johnson Member Posts: 174
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    Tempering valve

    Tempering valve not working?
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,956
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    What tempering Valve??????

    Lucky to see a few globe valves off a coil....but the man is 100% correct: GET ONE ON THERE NOW! Mad Dog

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Doug_7
    Doug_7 Member Posts: 244
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    160* tap water produces 3rd degree burns in less than one second of contact time for adults and 0.2 seconds for a child. Very dangerous scalding hot water. Fix ASAP.
  • Weezbo
    Weezbo Member Posts: 6,232
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    that is some real good reason to make certain you get good info

    ...the coil could breach, that said, what it means is, the boiler water makes a direct exchange with the water that was within the coil...as soon as a valve opens, the built up water goes there...now, you might get lucky..there might Be a working relief valve on the boiler...it would open first...maybe....

    yet, who noticed any water leaking around the boiler? Dont 'all Boilers leak?'

    however should the breach occur while your darling grandmother was in the shower ....it might peel her hide off ,searing the flesh from her ancient though well preserved body...

    especiallyuncomfortablle is this for her..she no likey... you be best doing exactly what the ladds are saying and get that anti-scald devise on there Pronto. *~/:)
  • Dan_40
    Dan_40 Member Posts: 15
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    You said when you lower your low setting, the boiler shuts off at low setting is this correct? Is this during a call for heat. All of us are ready to jump on you for not having a mixing valve installed but, we don't know if you do. As I understand it your high limit should shut your burner off at " high limit" The differential is your low water setting on a call for heat only. The Low water setting would then be your High Limit for your domestic. When tankless gets above say 130 and no call for heat then the boiler should not fire. I agree that possibly the mixing valve is either not installed or not working correctly. I would vrify the installation but also, they are not an exact science like your typical wall hung t-stat. If your boiler is keeping 180 deg. in the tankless then having the wrong or defective mixing valve installed would not work. Possibly turn down your low limit to 125-130 and see where that gets you. It is very similar to an anti-scald shower valve. When I set the temperature at the shower to 112 when I have 125 pumping through it then all is good, but when someone bumps it up to 150. I HAVE A PROBLEM!!!
  • realolman
    realolman Member Posts: 513
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    First off

    160 domestic hot water is way too hot!

    The DHW leaving your boiler should be about the same temp as the boiler. You have to have a tempering valve to mix with cold before it goes to the house, because the boiler will be too hot for DHW most of the time.


    I don't know what kind of aquastat you have... could you provide a model number and name brand? If you had a Honeywell L8124 it would work like this:


    High Limit Controller


    The high limit opens and turns off the burner when the
    water temperature reaches the set point. The high limit
    automatically resets after the water temperature drops
    past the set point and through the 10°F (6°C) differential.
    Low Limit and Circulator Controllers


    On a temperature rise, with the adjustable differential at the
    minimum setting of 10°F (°C), the burner circuit (R-B) breaks
    and the circulator circuit (R-W) makes at the control set point.


    On a temperature drop of 10° F (6°C) below the set point, the
    R-B circuit makes and the R-W circuit breaks. See Fig. 22.
    At any differential setting greater than 10°F (6°C), the R-B
    make temperature and R-W break temperature will remain the
    same (control setting minus 10°F (6°C). The R-B break and
    R-W make temperature will be the set point temperature plus
    the difference between the differential setting and 10°F (6°C).



    EXAMPLE:Set point of 140°F (60°C) differential set at 25°F
    (14°C). On a temperature rise, R-B will break and R-W will
    make at 155°F (68°C). On a temperature fall, R-B will make
    and R-W will break at 130°F (54°C).


    On the L8124M, the burner and circulator circuits are
    controlled separately. the low limit controls the burner circuit
    (R-B) as described above, while the low voltage thermostat
    directly controls the circulator circuit
  • Jacob myron_19
    Jacob myron_19 Member Posts: 2
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    Domestic Hot water

    Forget changing settings on boiler controls.

    The coil manufacturers rate the out put of a coil in gpm when the boiler is at 200 degrees F.

    Lowering the aquastat temps. below 180/160 will have an adverse affect on the ampunt of hot water produced for domestic use.

    To control the domestic hot water temperature an automatic mixing valve needs to be installed.

    For safe usage of domestic hot water the set temperature should not be above 120 degrees.

    Holby valve company makes a fine temperature control and so does the heat timer corp. These mixing valves use a fluid filled element to respond to the hot water leaving the coil.

    Both valves will mix the appropriate amount of cold water to maintain a uniform outlet temprerature.

    Hand mixing globe valves are a thing of the past as they donot respond to temperature fluctuation nor are they safe to use.

    As to the installation of anti scald valves for the shower I recommend that also. Scald burns even at the first degree are painful and on very young children, old people and some women the burn can be devastating. Here discretion is the better part of valor.

    Use both devices and be safe.


    Jake

  • Jacob myron_19
    Jacob myron_19 Member Posts: 2
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    Domestic Hot water

    Forget changing settings on boiler controls.

    The coil manufacturers rate the out put of a coil in gpm when the boiler is at 200 degrees F.

    Lowering the aquastat temps. below 180/160 will have an adverse affect on the ampunt of hot water produced for domestic use.

    To control the domestic hot water temperature an automatic mixing valve needs to be installed.

    For safe usage of domestic hot water the set temperature should not be above 120 degrees.

    Holby valve company makes a fine temperature control and so does the heat timer corp. These mixing valves use a fluid filled element to respond to the hot water leaving the coil.

    Both valves will mix the appropriate amount of cold water to maintain a uniform outlet temprerature.

    Hand mixing globe valves are a thing of the past as they donot respond to temperature fluctuation nor are they safe to use.

    As to the installation of anti scald valves for the shower I recommend that also. Scald burns even at the first degree are painful and on very young children, old people and some women the burn can be devastating. Here discretion is the better part of valor.

    Use both devices and be safe.


    Jake

  • ken D
    ken D Member Posts: 60
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    thanks

    > Forget changing settings on boiler

    > controls.

    >

    > The coil manufacturers rate the out

    > put of a coil in gpm when the boiler is at 200

    > degrees F.

    >

    > Lowering the aquastat temps. below

    > 180/160 will have an adverse affect on the ampunt

    > of hot water produced for domestic use.

    >

    > To

    > control the domestic hot water temperature an

    > automatic mixing valve needs to be

    > installed.

    >

    > For safe usage of domestic hot

    > water the set temperature should not be above 120

    > degrees.

    >

    > Holby valve company makes a fine

    > temperature control and so does the heat timer

    > corp. These mixing valves use a fluid filled

    > element to respond to the hot water leaving the

    > coil.

    >

    > Both valves will mix the appropriate

    > amount of cold water to maintain a uniform outlet

    > temprerature.

    >

    > Hand mixing globe valves are a

    > thing of the past as they donot respond to

    > temperature fluctuation nor are they safe to

    > use.

    >

    > As to the installation of anti scald

    > valves for the shower I recommend that also.

    > Scald burns even at the first degree are painful

    > and on very young children, old people and some

    > women the burn can be devastating. Here

    > discretion is the better part of valor.

    >

    > Use

    > both devices and be safe.

    >

    > Jake



    Thank you guys for the responses.

    Have a Honeywell L8124 ,

    will try lowering lower setpoint,

    found the mixing valve, a gate valve shut completely--opened it

    and will play with that.

    Will look into an anti scalding valve too.

    Tried lowering it before, but boiler shut off with heating water too low, 160 for Dan, but this time, it seems fine. Especially metering the gate valve. Clogged a faucet already from debris settling in gate valve over time, a natural trap.

    Will watch it over time but should be fine with the above advice. Thanks guys.
  • Dave_4
    Dave_4 Member Posts: 1,405
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    Oh honey- I thought you were SCOLDING the kids

    Oh honey- I thought you were SCOLDING the kids...
This discussion has been closed.