Thermostat works the opposite way of what I need

Post Reply
 
jagonoja
New Member
Posts: 6
Joined: Thu. Dec. 24, 2020 7:59 am

Post by jagonoja » Thu. Dec. 24, 2020 8:07 am

Hello everyone, this is my first post, and I'm not an expert.

I have a condensation problem in my coal stove, and want to install a thermostat that basically turns off the pump, when the temperature is UNDER a certain degree.

As you may imagine, what happened is that this thermostat I've bought and installed (placed on the hot water pipe) turns off the pump ABOVE a certain temperature.

Is there anything I can do to savage the situation (with the wiring inside the thermostat), or what should I buy instead?

extra info:
I am an expat located in Kazakhstan so what I have available here is local/for the russian market and naming of product not straightforward.
My stove is a "Prometey" model, just installed after an accident with my old one. I like it so far except for the condensation problem, and the fact that it keeps circulating water when the fire dies off, something that I'd like to precisely remedy with the thermostat.

 
User avatar
Rob R.
Site Moderator
Posts: 17979
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM 520
Hand Fed Coal Stove: Chubby Jr

Post by Rob R. » Thu. Dec. 24, 2020 8:18 am

Welcome. Some controls can be setup either way, so it will depend on what model control you are using. Can you post a picture of the control?

 
KLook
Member
Posts: 5791
Joined: Sun. Feb. 17, 2008 1:08 pm
Location: Harrison, Tenn
Other Heating: Wishing it was cold enough for coal here....not really

Post by KLook » Thu. Dec. 24, 2020 8:27 am

IF you cannot get a unit that works in the way you need, perhaps you can get a simple relay that will change the functionality of the unit. I used relays to make my Rube Goldberg boiler work in Maine. And I shut it off on low temp also and allowed the gas boiler to fire.

Kevin

 
User avatar
lsayre
Member
Posts: 21781
Joined: Wed. Nov. 23, 2005 9:17 pm
Location: Ohio
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75

Post by lsayre » Thu. Dec. 24, 2020 8:38 am

What you need is a "Normally Open" (NO) aquastat or thermostat switch with "Close On Rise" and a 10 degree "differential". One that "closes" and completes the circuit (and thereby turns on the circulator pump) at 50 degrees C., and "opens" to break the circuit at anything below 40 degrees C.

As mentioned above a relay can be used to reverse the functioning of the switch you already have, or also as mentioned above, your switch may already have both 'NO' (Normally Open) and 'NC' (Normally Closed) contacts.


 
franco b
Site Moderator
Posts: 11416
Joined: Wed. Nov. 05, 2008 5:11 pm
Location: Kent CT
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Post by franco b » Thu. Dec. 24, 2020 8:48 am

What you want is a reverse aquastat which is intended for the problem you have. If you can get Honeywell controls there will be a B rather than an A in the model name. Google "reverse aquastat".

 
jagonoja
New Member
Posts: 6
Joined: Thu. Dec. 24, 2020 7:59 am

Post by jagonoja » Thu. Dec. 24, 2020 8:54 am

Thank you everyone for the useful and quick replies!
here are two pictures:

Image
Image

the thermostat on the hot water pipe
and the diagram included in the box.

as per the diagram, I connected input in C, output in 1 and earth. I tried to put both ends of the other wire in 2, but it hit the breaker so I just tied them together. I thought maybe I could use 2 to somehow reverse the system? (this is how much of a newbie I am to this!)
The thermostat has a reset button, I haven't tried it yet.

 
jagonoja
New Member
Posts: 6
Joined: Thu. Dec. 24, 2020 7:59 am

Post by jagonoja » Thu. Dec. 24, 2020 8:58 am

I can look for an aquastat, but it may prove difficult. The variety of products here in KZ is very limited and buying off the internet (Aliexpress) takes months. That's why I was hoping I could do something to get this one to work the way I want.
Also, is the aquastat something I can similarly install without having to dismantle any part of the system?

 
franco b
Site Moderator
Posts: 11416
Joined: Wed. Nov. 05, 2008 5:11 pm
Location: Kent CT
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Post by franco b » Thu. Dec. 24, 2020 9:16 am

Look for a plumbing supply house. You simply connect the hot wire going to the circulator pump to one contact and the other contact to the pump. The ground or earth wire just goes right through, no interruption.

The control breaks the circuit when the temperature drops below the set point.

There are strap on models if there is no place to install the well for the sensing probe.


 
jagonoja
New Member
Posts: 6
Joined: Thu. Dec. 24, 2020 7:59 am

Post by jagonoja » Thu. Dec. 24, 2020 9:27 am

franco b wrote:
Thu. Dec. 24, 2020 9:16 am
Look for a plumbing supply house. You simply connect the hot wire going to the circulator pump to one contact and the other contact to the pump. The ground or earth wire just goes right through, no interruption.

The control breaks the circuit when the temperature drops below the set point.

There are strap on models if there is no place to install the well for the sensing probe.
Thank you, I will look for it! For starters, I'll bring this piece back to the guys who sold it to me telling me it would precisely do what I wanted.))

 
jagonoja
New Member
Posts: 6
Joined: Thu. Dec. 24, 2020 7:59 am

Post by jagonoja » Thu. Dec. 24, 2020 9:30 am

BTW, I realize this is not an electrical work forum but does anyone understand what "2" is for, in the diagram?
Image

 
User avatar
Rob R.
Site Moderator
Posts: 17979
Joined: Fri. Dec. 28, 2007 4:26 pm
Location: Chazy, NY
Stoker Coal Boiler: EFM 520
Hand Fed Coal Stove: Chubby Jr

Post by Rob R. » Thu. Dec. 24, 2020 9:40 am

Move your wire from terminal 1 to terminal 2 and set the control to 65C. That should power your pump when ever the boiler is at 65C or more.

 
franco b
Site Moderator
Posts: 11416
Joined: Wed. Nov. 05, 2008 5:11 pm
Location: Kent CT
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Post by franco b » Thu. Dec. 24, 2020 9:49 am

Try as Rob suggests. Yes 2 seems to be the reverse contact.

 
jagonoja
New Member
Posts: 6
Joined: Thu. Dec. 24, 2020 7:59 am

Post by jagonoja » Thu. Dec. 24, 2020 12:31 pm

Rob R. wrote:
Thu. Dec. 24, 2020 9:40 am
Move your wire from terminal 1 to terminal 2 and set the control to 65C. That should power your pump when ever the boiler is at 65C or more.
This did the trick. The thermostat is now working as I intended it. Thank you! Time will tell if this helps with condensation and the general performance of the system (there is probably some fine tuning to be made between the therm-regulator and the thermostat, that have different response timeframes), but for now I can go to bed satisfied.

Merry Christmas, Happy holidays, everyone.

Post Reply

Return to “Bituminous Coal Heating General Topics”