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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.
I need to buy on-line.
Any model numbers ?
What terminology do I look for ?
Please help.
danny burstein wrote:
> In <602c5820$0$27446$e4fe514c@textnews.kpn.nl> Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> 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.
>
Reply by Evgeniy●February 17, 20212021-02-17
Hello, Olden!
On Tue, 16 Feb 2021 12:55:07 -0800
Olden <Olden@Olden.com> 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
Reply by danny burstein●February 16, 20212021-02-16
In <602c5820$0$27446$e4fe514c@textnews.kpn.nl> Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> 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.
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
Reply by amdx●February 16, 20212021-02-16
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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Reply by Sjouke Burry●February 16, 20212021-02-16
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.
Reply by Olden●February 16, 20212021-02-16
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.