Delaying the thermostat signal to the boiler? Options?

[Blk88GT]

I have a 20kw electric boiler setup with an Aube thermostat with slab sensor. (http://www.aubetech.com/products/produitsDetails.php?noProduit=92&noLangue=2)

I've found that when I open one of my overheads and bring in a vehicle, the cold gust of air will hit the thermostat and it will call for heat when really it doesn't need it. The boiler will cycle on and once the air has settled and warmed up, it shuts off as there is no need for it.

How can I avoid this? I was under the impression the slab sensor thermostat was designed to avoid this, but I was wrong. It's wasting electricity, and more importantly, my money!

Is there a way to delay the call for heat signal from the thermostat to the boiler by 5 minutes or is there a different thermostat I could use?

Any help would be appreciated!

 

[Rockhead261]

http://www.grainger.com/Grainger/IC...cm_sp=IO-_-IDP-_-RR_VTV70300505&cm_vc=IDPRRZ1

 

[Blk88GT]

Perfect, thank you very much!

 

[rice rocket]

Won't that just turn the boiler on, 5 minutes later, and shut it off...5 minutes later?

 

[Rockhead261]

Won't that just turn the boiler on, 5 minutes later, and shut it off...5 minutes later?

Yes and no.

It delays on make, so yes - 5 minute delay for heat. It'll shut off as soon as it satisfies.

To the OP - you may need to make an anticipator adjustment to keep the heat on a little longer.

 

[larry_g]

You should be able to find a relay that requires a steady input for X time ant then turn on the output till the input goes away. Study the potter&brumfield catalog a bit and figure out what one you need. Relays can be had with all sorts of different input/output configurations.

On edit, found this information http://www.serelays.com/library/section5/105A_TDRPRO-5100.pdf Looking at the chart you would want a 'on delay' that turns on the output after the set time but turns off the output when the input turns off. So if the thermostat calls for only a minute and then goes off then the output will not trigger with a 5 minute delay.

lg
no neat sig line

 

[Charles (in GA)]

If the thermostat is re-warmed and satisfied prior to the end of the time delay, nothing will happen, if the time delay runs out, and the thermostat is still calling for heat, the boiler will then come on, and run till the thermostat warms and ends the heat call.

Charles

 

[The Cobbler]

is the stat low voltage? if so how about wiring it to a magnetic alarm contactor attached to the door so the stat doesn't call for heat when the door is open?

 

[Blk88GT]

If the thermostat is re-warmed and satisfied prior to the end of the time delay, nothing will happen, if the time delay runs out, and the thermostat is still calling for heat, the boiler will then come on, and run till the thermostat warms and ends the heat call.

Charles

That is my understanding as well.

 

[Charles (in GA)]

is the stat low voltage? if so how about wiring it to a magnetic alarm contactor attached to the door so the stat doesn't call for heat when the door is open?

This is a very good idea, unless the OP thinks the door may be open for extended periods of time. If that is the case, the time delay may be better. If it will almost always be an open and shut, the door switch would be better.

Charles

 

[Blk88GT]

It's not so much that I don't want it calling for heat when the door is open (short periods of time) it's that I don't want it calling for heat unless it really needs it. I don't think I need to over complicate things, the delay relay is inexpensive and easy to install. I'm going to order one today.

 

[pseudorealityx]

Sounds to me like the slab sensor is installed incorrectly, or otherwise isn't working as designed.

 

[anthony666]

Sounds to me like the slab sensor is installed incorrectly, or otherwise isn't working as designed.

nope, aube thermostats work off room temperature, the slab sensor is there to limit slab temperature only

 

[RECox286]

One of my customers had a boiler in a detached garage and an under ground

run of pipes to the house. When he put a new zone in to heat the garage

I mentioned to him that if someone came in to use the shop, that the boiler

would try to keep up with the heat loss. I said the easy solution was

to put a magnetic switch on the shop door, so that the boiler would not get

a signal to ignite unless the shop was secured and ready for heat. This

worked very well, a little too well, in fact. I got a call the very next fall...no

house heat (???) My reply was "is the shop door open or closed ?" He had

forgotten about the extra switch I had put into the circuit which included

BOTH T-stats ! There had been a chill that morning, and since it was warmer

during the previous day, he had left the shop door open to air out.

Sometimes you get the bear, other times ...

Rewiring the switch to exclude the house T-stat solved the problem

permanently.

Uncle Bob

 

[Blk88GT]

I should get the relay in a week or so, it had to be brought up from the US. I will post back with my results. Thank you everyone for your input.

 

[the_saint]

Can you fashion a small wind break around the temperature probe to keep the gusts of wind from hitting it?

 

[rancherbill]

I'd read the manual for your thermostat. I have several different brands and all of them have a delay that is built in to them. The default is no delay. Some you program from the front, and another one you cut a resistor.

 

[Blk88GT]

I'd read the manual for your thermostat. I have several different brands and all of them have a delay that is built in to them. The default is no delay. Some you program from the front, and another one you cut a resistor.

Thank Bill, there is nothing in the manual relating to delaying the call for heat signal.

I'll post back with results once I have the delay unit installed!

 

[rice rocket]

Friend of mine had an idea, is this on a garage door setup?

If so, hook up the garage door light to a SPDT relay, with the thermostat connected when the switch is open. Since most garage doors have a 5 minute timer, it'll disconnect your theromstat when the door opens and 5 minutes after.

 

[Blk88GT]

I just wanted to post back my results with the $13 fix in post 2. After a few minutes of figuring out the wiring, I installed the relay in one of the pull boxes for my setup. It works like a charm!

SUCCESS! THANK YOU!

 

[Rockhead261]

I just wanted to post back my results with the $13 fix in post 2. After a few minutes of figuring out the wiring, I installed the relay in one of the pull boxes for my setup. It works like a charm!

SUCCESS! THANK YOU!

Good to hear. Those little solid state relays sure do come in handy.

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