Coal Boiler & Outdoor Reset

Kungur

I am presently heating my house with a coal stoker boiler,Keystoker KA-2. My house is set-up for radiant floor heat. I am using a Tekmar 3 Way Mixing Valve #712 to maintain 130F water temp to my manifolds. The system works great but when we get the extremes like we have this winter and then the Spring and  Fall dyas with cold nights and warm days, I would like to consider an outdoor reset system.

Tekmar has an actuating motor for this valve and they told me that Model # 360 Control would be what I need.<a href="http://www.tekmarcontrols.com/prod/360.shtml">http://www.tekmarcontrols.com/prod/360.shtml</a>

As a carpenter/woodworker that put this system together with some help from others I was wondering about this set-up.

All I want to do is have the outdoor temp "adjust" the 3 way mixing valve as needed based on the outdoortemp. But the info on the Boiler Control 360 shows the pumps etc. being controlled. Can I just wire this to the actuating motor on the mixing valve only?

Would really appreciate your help.

Big Ed_4

Sure you could

But why not the whole boiler and save on the fuel and add comfort to your other zones .. Taco makes The I Series R mix valve with a built in outdoor reset for a radiant zone too.

Kungur

Coal Boiler & Outdoor Reset

Since I have the Tekmar already installed I really donot want to replace it. As for controoling the "whole" boiler. Not sure that is really possible with the coal boiler. So I was thinking to make it as simple as possible.

So my question is still the same from the first post.

Thanks

Big Ed_4

1909

I have a old brochure laying around here for 1909 for a manual counter weighted outdoor reset which operated the air damper of a coil boiler with a chain ...



Seem like a waste using just part of that control but yes you can just use it for a motorized mixing valve ... I find there literature somewhat confusing and they may not show all the options ...

Kungur

Any Other Comments?

So anyone else have any advice?

RobbieDo

Reset

I guess my question is, what are you trying to achieve? I'm sure the temp on the boiler is hot enough to heat the water to the 130 temp. If you can maintain 130 temp then you should be fine, I guess I'm confused?

Big Ed_4

Advice

Just a recommendation , I understand you what to save a few buck , you are unsure and what to make it simple so no mistakes are made ... Control wiring I feel is another trade where I find most electricians are afraid of . Yes unwanted things can happen if not correct ..The control you bought is a very nice control and can control your hold system .. It is not a run of the mill control we run across everyday ..... Since you already own the control , call in the right guy and do it right ... Well worth the call . Just trying to help .... It would like me trying to build a seven gable roof ....

Randy Baerg

outdoor reset mxing with a tekmar 360

The tekmar 360 control can operate a 741 motor mounted onto your 712 three way mixing valve. It would be best to connect at least the pump for the manifold ('Mix System pump') to the control. That way it can turn on the pump when the thermostat calls and also provide Warm Weather Shut Down WWSD to disable the pump and save energy.

The 360 can either control the boiler directly or enable it or do nothing with it. The choice depends on your system and your preference. If you don't want to control the boiler, or the system doesn't allow for it, then make sure you set the 360 Boiler Sensor DIP switch Setting = Return. The control then uses only the floating action mixing to keep the Mix Supply temperature at the calculated target.