which aquastat should I use for pure boiler heating system w/o hot water heater


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Old 10-28-14, 07:52 AM
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which aquastat should I use for pure boiler heating system w/o hot water heater

Hi everyone,

I have an old boiler hot water PURE heating system without domestic hot water need, and I just fixed the "most radiators not hot" problem 2 weeks ago.

Now I am trying to fix another issue, i.e., this system does NOT even have an aquastat controller but a simple gas valve control (thermostat). In this way, the circulator pump would run 24/7 once the system power supply is on, which has 2 consequence: 1) reduces the pump service life, and 2) waste energy. So I'd like to add an aquastat to it. Could some one please advise which aquastst I should use for this simple objective - the circulator pump runs ONLY when the thermostat calls for heat.

Any advice would be appreciated! Thank you.

-York
 
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Old 10-28-14, 08:17 AM
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Hi York,

Can you include a link to your older thread so we can refer back to it?

What do you mean by " PURE " ?
 
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Old 10-28-14, 09:20 AM
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Have you corrected the perceived problem which I pointed out in post #54 of this thread?

http://www.doityourself.com/forum/bo...ml#post2330052
 
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Old 10-28-14, 07:14 PM
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Thanks Trooper for your reminder!

Yes I know what you are talking about. Later I had successfully tuned the burner flame down to about 1" tall, which is said to be "standard" flame size. It was about double sized tall for unknown reason or adjusted by previous owner or professionals who might have tried to make cold radiators hot.

Now there is little burned gas escaped from the burner and I believe it is safe now. Thanks again for your concern and reminder!

As I said, this old boiler system is used for heating only. In other words, there is a dedicated hot water tank for hot water needs. That's why I said it is pure heating system. So, the control should be much simpler in my understanding - thermostat and aquastat together control gas valve (wired in series, using the aquastat's high limit function), while the thermostat also controls the pump. So no low limit is needed in this case.

I just ordered Honeywell L6006c1018. Would you please advise how I should wire it?

Appreciate your time and help!

-York
 
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Old 10-29-14, 04:36 AM
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We often put the main house circ on a summer / winter switch.
Constant circulation can help balance out colder rooms and has some merit to it.
If it were me, I would spend the money that your about to drop on an aquastat on an ECM circ such as an Grundfos Alpha. At least your investment will have some payback in the years to follow.
 
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Old 10-29-14, 08:19 PM
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Hi TOHeating,

Thanks for your comments and suggestions. I already bought a circulator recently, so the ECM pump might be my future consideration.

Now I just received my Honeywell aquastat L6006c today, and am wondering how to wire it in order to control the circulator pump and high limit. Before I ordered it, I am given an impression that this aquastat could be used simultaneously for high/low limit and circulator pump controls, but now I found there is only three leads, ie., R, B, and W, which seems to be used for only one control. Any ideas or advice?

Thank you again.

-York
 
 

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