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  • Thermostat

    From Olden@21:1/5 to All on Tue Feb 16 12:55:07 2021
    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.

    I do not understand thermostats.

    The local store does not know how to advise me.

    Thermostat suggestions please and maybe a little tutorial.

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  • From Sjouke Burry@21:1/5 to Olden on Wed Feb 17 00:41:20 2021
    On 16.02.21 21:55, Olden wrote:
    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.

    I do not understand thermostats.

    The local store does not know how to advise me.

    Thermostat suggestions please and maybe a little tutorial.

    It would be nice to know the open voltage and the switch current when
    closed.
    Around 24 volts any ordinary programmable thermostat unit might do.

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  • From amdx@21:1/5 to Olden on Tue Feb 16 18:03:01 2021
    On 2/16/2021 2:55 PM, Olden wrote:
    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.

    I do not understand thermostats.

    The local store does not know how to advise me.

    Thermostat suggestions please and maybe a little tutorial.

    The easy way is to have two thermostat and a switch. Have one adjusted
    for day and the other for night and

    day/night switch to go between them. It gets more complicated if you
    have an air conditioner to deal with.


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  • From danny burstein@21:1/5 to Sjouke Burry on Wed Feb 17 02:19:59 2021
    In <602c5820$0$27446$[email protected]> Sjouke Burry <[email protected]> writes:

    On 16.02.21 21:55, Olden wrote:
    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.

    I do not understand thermostats.

    The local store does not know how to advise me.

    There are (or at least were...) plenty of thermostats
    with multiple settings that followed the time of
    day and used a battery to operate the clock, hence
    could be hooked up to a basic two-wire control system
    and not worry about wiring for power.

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  • From Evgeniy@21:1/5 to Olden on Wed Feb 17 07:11:34 2021
    Hello, Olden!

    On Tue, 16 Feb 2021 12:55:07 -0800
    Olden <[email protected]> wrote:

    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.


    Just an idea: you can use two thermostats and mechanical 24 hour timer to switch them. Something like that: https://www.theben.de/en/syn-161-d-1610011 Timers can be different, with different outputs (output relay type/voltage/current, etc), this is just
    an example. If you do not need precision time keeping on power loss, it's preferable to use a timer without battery (no potential battery leaking out). I do not know your schematics and may be any safety limits, so it's just an idea.


    ------
    With Best Regards,
    Evgeniy

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  • From Olden@21:1/5 to danny burstein on Thu Feb 18 16:18:51 2021
    I need to buy on-line.
    Any model numbers ?
    What terminology do I look for ?

    Please help.


    danny burstein wrote:
    In <602c5820$0$27446$[email protected]> Sjouke Burry <[email protected]> writes:

    On 16.02.21 21:55, Olden wrote:
    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.

    I do not understand thermostats.

    The local store does not know how to advise me.

    There are (or at least were...) plenty of thermostats
    with multiple settings that followed the time of
    day and used a battery to operate the clock, hence
    could be hooked up to a basic two-wire control system
    and not worry about wiring for power.


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  • From whit3rd@21:1/5 to Olden on Thu Feb 18 22:43:16 2021
    On Thursday, February 18, 2021 at 4:19:01 PM UTC-8, Olden wrote:
    I need to buy on-line.
    Any model numbers ?
    What terminology do I look for ?

    Almost any 'smart' thermostat can do a daily fallback, but this
    does mean it's a display-and-buttons-and-clock elaborate item.
    Honeywell is a big manufacturer, their web site should give you
    some ideas <https://honeywellstore.com/store/products/wi-fi-7-day-programmable-thermostat-honeywell-rth6580wf.htm>

    Look at a few, and maybe check out the manuals online.

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  • From Dan Purgert@21:1/5 to Olden on Fri Feb 19 12:58:39 2021
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    Olden wrote:
    Best to ask here or ?

    My gas furnace is a Holly.
    It has an old mercury two wire thermostat.

    I want to change the thermostat so that I can set the same two
    temperature ranges, day / night, for every day.

    I do not understand thermostats.

    The local store does not know how to advise me.

    Thermostat suggestions please and maybe a little tutorial.

    The major thing you need to know is the control voltage - that SHOULD be stamped / molded into your existing thermostat. After that, it's a
    quick wire-for-wire swap -- check the existing, it's probably labeled as
    "W" / "R" (for "White" and "Red" wire, respectively). Connect those
    wires coming out of the wall to the same terminals of the new thermostat (ignore Y/B/etc, as those connections are for cooling / multi-stage
    heat / etc.).

    Then program the thing for whatever temperatures you want.



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