should i install an outdoor reset control system?

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Old 01-18-10, 03:13 AM
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should i install an outdoor reset control system?

200 year old house. unlined chimney. Buderos boiler with 294MBtu/hr capacity. 9 zones including DHW.

I have insulated the house since the furnace was installed and now the cycling has become very short.

I was looking at putting in an outdoor reset control to save money. my annual heating bills run between $3,500 and $5,000 so a 10% savings would really help.

since i am running the dhw off the boiler, i suppose i need a outdoor reset control with a dhw override. I was looking at the Tekmar 260.

I want to run my hot water heater hot (130 degress) and mix it down to 110 for the faucets in order to increase dhw capacity.

I am wondering if there are any risks to putting in a outdoor reset control? will i save money? as far as comfort is concerned, I am perfectly happy as it is (although I notice the boiler firing up at night).

thanks in advance.
 
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Old 01-18-10, 06:46 AM
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Which Buderus?

How big are the zones, and what kind of heat emitters (cast iron radiators?)?

What is the heat loss of the building?

You might also look into the Buderus Logomatic 2107 control.

Running DHW hot and tempering down is a different issue, i.e., not control-related. That requires an anti-scald tempering valve (Taco 5000 or Honeywell/Sparco AM are examples) on the DHW output.
 
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Old 01-18-10, 08:25 AM
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Originally Posted by xiphias View Post
Which Buderus?
Lagano G215-7

Originally Posted by xiphias View Post
How big are the zones, and what kind of heat emitters (cast iron radiators?)?
Each zone is approximately 1-3 rooms 800 Sqft

Originally Posted by xiphias View Post
What is the heat loss of the building?
I don't know but it certainly varies. there are two connected structures that make up the farmhouse. The larger of the two structures was insulated with icynene and stays very warm. the other part of the house loses heat pretty quickly as it is generally uninsulated (but I am redoing this portion of the house over the next 18 months). see Thermal images of my house - a set on Flickr for pictures with a thermal camera on a very cold night


Originally Posted by xiphias View Post
You might also look into the Buderus Logomatic 2107 control.
ok, I will check it out. it currently is using Beckett burner with Honeywell controller

Originally Posted by xiphias View Post
Running DHW hot and tempering down is a different issue, i.e., not control-related. That requires an anti-scald tempering valve (Taco 5000 or Honeywell/Sparco AM are examples) on the DHW output.
yes, I just didn't know if it made sense to use outdoor reset when I am going to have to have the furnace running at 140deg minimum (to head DHW)
 
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Old 01-18-10, 08:55 AM
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I am not sure I agree with OD rest on a situation where you have small zones as you do. I think you may be better served with a Beckett heat manager or use OD rest and reduce the amount of zones in the structure.
It's a shame the boiler was already installed before you started tightening up the home. I assume it was necessity to replace when you did.
I feel controlling the cycle rate is more of a fuel saver than heating water temperature.
If you use OD reset you are making up the difference of the btu's used on a demand for heat. That is not going to change the cycle rate and may even make it worse. I had a job we used the Heat Manager and an OD reset control.
 
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Old 01-18-10, 10:19 AM
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I agree. I was not advocating for the ODR without some other info
 
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Old 01-18-10, 03:02 PM
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what is a Heat Manager? I also should have mentioned that the house uses radiant floor boards.
 
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Old 01-18-10, 09:28 PM
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sorry guys, I already have a beckett heat manager on the system. how should I incorporate a outdoor reset into the system?
 
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Old 01-19-10, 05:52 AM
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Maybe ODR and incorporate a bufffer tank in there to reduce the short cycling.
 
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Old 01-19-10, 06:44 AM
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You can do the OD reset. With the heat manager you are getting short run cycles but the off time is longer. Outdoor reset will not affect the run time but will reduce the system water temperature.
 
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Old 01-19-10, 08:17 AM
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Originally Posted by rbeck View Post
You can do the OD reset. With the heat manager you are getting short run cycles but the off time is longer. Outdoor reset will not affect the run time but will reduce the system water temperature.
great, what system should I use?
 
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Old 01-19-10, 01:12 PM
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This is a radiant floor system? What kind? Plates under subfloor? Tubes in concrete? What is controlling the water temperature right now?
 
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Old 01-30-10, 07:08 AM
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No, its baseboard hot water
 
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Old 01-30-10, 08:11 AM
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the house uses radiant floor boards.
its baseboard hot water
Huh? which is it? either/or/both ?
 
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