Econoburn 150 stack sensor cycling

[Tdobbin]

So.. ive got a Econoburn 150 indoor. Last year I ordered and installed a stack sensor from dale. It works as it should based on the set point I choose. Usually 80degree f. Only issue is as the stack temp falls to the set point the fan will cycle on and off every 5 seconds or so for about 5 minutes. Then it will turn off and stay off. Seems like the sensor needs some kind of time delay so I won’t burn out my motor. My system is pretty much stock. I haven’t modified anything. The sensor was plug and play.
Any help will be appreciated
Thanks
Tom

 

[salecker]

Hi Tom
I am interested in how you make out.I need to add an end of burn shutoff to my 200.I just found out about the stock system ability to add that feature.
How about if you had the stack sensor powering a relay,and as soon as the stack sensor shut off once the relay would drop out and have to be manually reset before the fan would run again.
Thomas

 

[Tdobbin]

That is a good idea. I didn’t think of that. I’m just wondering how to go about it. The sensor plugs right into the board and as far as I know the board reads the resistance and “calculates” the temperature. So I guess the relay would have to go inline with the motor but that would mess up the normal function of the burn cycle. Eg if the motor stops when the water temp reaches setpoint.
That’s a long way of saying. Where would I put the relay.
Thanks

 

[salecker]

For that i am no help.
Maybe once i see what is there and get my electrician to look at it.

 

[Tdobbin]

Funny thing is I am an electrician and I can’t devise a way to do it. I even talked to a hvac control specialist. He said I cannot add a relay to the thermocouple. based on my explanation to him he is saying it must have a built in delay on the circuitboard. I’m going to call Econoburn service and see if they have a fix for it. I can’t be the only on experiencing this. I’ll let you know what happens.

 

[Tdobbin]

Wow. So dale @econoburn is saying that the thermocouple I ordered from him is an “after-market” part and it’s basically my problem. I honestly don’t know what to say. I paid approx $180cad shipped for this part and it has known compatibility issues and Econoburn won’t help with it. They did not warn me about the issues

 

[salecker]

Hmmm that sucks
Back to the drawing board.
One direction i was thinking of trying was to get a snap disk and use that to trigger a relay.Just need to get a disk with the right temp range.I was thinking of just controlling the fan for end of burn.Then the boiler control should take care of the pump once the water cools.

 

[TCaldwell]

What type thermocouple is it, also is it a grounded or ungrounded type? Thermocouples are subject to interference and require special lead wire, there are several good reads on the web.