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sunlight33

sunlight33

Joined on April 20, 2013

Last Post on August 12, 2014

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Yes

@ August 12, 2014 9:31 PM in Boiler with mini split for heating

Everything's good.

Boiler with mini split for heating

@ August 12, 2014 8:22 PM in Boiler with mini split for heating

A mini split system (2 ton, 3 indoor units) was install in my house, but this summer has only been mild so far. I have a mod-con boiler and I know the mini split is more energy efficient in heating as well. What's the best for me to do to save the most on heating this coming winter? I live in upstate NY and the house is 25+ years old so I most likely still need to reply on the boiler during the coldest months.

room temp. correction

@ July 3, 2014 8:36 PM in room temp. correction

If the AC is set to 74F but the room stays at 77F, which of the following Cooling Room Temperature Correction should I choose to set?

Slightly lower control
Lower control
Warmer control

cycling number

@ June 26, 2014 3:19 PM in Combine two heating zones into one, any savings?

I remember the boiler cycled about 80 times a day in Jan/Feb, is this okay for a 3-zone house?

Thanks

@ June 26, 2014 1:48 PM in Combine two heating zones into one, any savings?

awesome! thanks

Suppose if..

@ June 26, 2014 12:22 PM in Combine two heating zones into one, any savings?

Let's assume the heating loss for both zones is the same, and the two zones each will call for heat 20 times in a day. If I tie both zones together, the combined zone will also call for heat 20 times a day right? So in the case of two zones, if they call heat at different times then the boiler and/or pump would need to be on more times than if there were just one zone?
I am just making this assumption to help me understand the situation.

Yes

@ June 26, 2014 10:42 AM in Combine two heating zones into one, any savings?

The two zones were there when I bought the house. I changed the boiler after I bought the house and the installer recommended to tie both zones into one but I declined because I wanted to keep the bedroom a bit warmer than the living room. We all know how cold the last winter was. In order to conserve fuel I dialed down the bedroom thermostat to make both zones the same temperature, and I found that the house was still pretty comfortable. So I am curious to see if I were to combine both zones into one, would it offer any additional savings.

Combine two heating zones into one, any savings?

@ June 25, 2014 9:04 PM in Combine two heating zones into one, any savings?

This should really be a question I ask before winter but I might as well do it now. The second level of my house (condensing boiler is what I have) has two heating zones (one for three bedrooms, rest is another zone). I initially thought I would need to keep the bedrooms a bit warmer but it turns out in the past winter I just set the thermostats for both zones with the same schedule and same temperature, and it was fine. So if I tie both zones into one will it bring any saving benefit? such as less boiler cycles.

Reverse

@ February 24, 2014 10:50 AM in The best Delta T for a mod-con?

If the boiler pump is set to a lower GPM than the system pump, that would keep the return temp low, but is there a drawback to this?

Pump speed

@ February 24, 2014 10:34 AM in The best Delta T for a mod-con?

Low loss header, one pump on the primary flow, another pump on the secondary flow. To achieve the highest efficiency, should the two pumps (3-speed) be set at the same flow rate or different?

holy shit

@ February 18, 2014 3:44 PM in Which of these two setbacks is more economical?

This is some deep stuff.

I see

@ February 17, 2014 2:25 PM in Which of these two setbacks is more economical?

I am in zone 5A. So it does seem more complicated than I thought. It's a 20+ year old house, walls are 4'' (R13 fiberglass), attic has about R50 of cellulose. By the way, I do prefer sleeping in a slightly cooler temp (about 3 degrees cooler), so that's why I asked if I should drop the 3 on thermostat or the Vitotrol (heating curve)?

Here's my motivation

@ February 16, 2014 3:10 PM in Which of these two setbacks is more economical?

I thought that if I could lower the return temp by a few degrees by decreasing the curve then it would make boiler condense even more efficiently.

Which of these two setbacks is more economical?

@ February 16, 2014 7:14 AM in Which of these two setbacks is more economical?

Like what the title says, one is to setback the heating curve by 3 degrees at night and keep the thermostat constant, the other one is to set the thermostat by 3 degrees while keeping the heating curve constant. I have all baseboard heating, boiler is Vitoden 200 with outdoor reset function, and Vitotrols which will give boiler an indoor temp feedback. Thanks!

LLH temp

@ December 13, 2013 1:44 PM in Low-Loss Header: am I understanding this correctly?

The comm. supply temp is around 108-120F, so the boiler is in condensing mode.

As to the pump setting, you were saying it didn't whether the two pumps are both in med or one in med the other in low, did I understand it correctly?

Pump setting

@ December 12, 2013 8:39 PM in Low-Loss Header: am I understanding this correctly?

Is it better to keep the Grundfos on both the primary and secondary loop to the same setting such as Med, or do you set the boiler pump to Lo and system pump to Med to further minimize the return temp? By the way, is there a way to monitor the temperature sensor inside the Viessmann LLH?

Any way to extract more heat from the exhaust?

@ November 19, 2013 10:17 PM in Any way to extract more heat from the exhaust?

The exhaust flue of my condensing boiler goes through an insulated (not heated) laundry room in my garage before exits the house, the flue feels warm to the touch and has kept the room a couple of degrees warmer than the rest of the garage (the room actually doesn't need to be comfortably warm, I just need to keep the pipes from freezing during the coldest nights here in NY). I know this has already been done by the condensing boiler but can more heat be left in that room before existing? By the way I was inspired by noticing the fins on the baseboard heater the other day. lol!

Regarding my first question

@ October 28, 2013 9:31 AM in outdoor reset and thermostat setback

I spent last Sunday doing air seals on windows, floors and electrical boxes, and the room felt a lot better now.
Any thoughts on my first question?

sorry i wasn't clear

@ October 27, 2013 11:08 PM in outdoor reset and thermostat setback

Both the boiler (shift of the heating curve) and thermostat are set back to the same temp.

I see

@ October 26, 2013 9:03 PM in outdoor reset and thermostat setback

I am not sure if this info can be found in the boiler display option, how is it found normally?

what is delta T?

@ October 26, 2013 8:30 PM in outdoor reset and thermostat setback

How do I find out the delta T?

outdoor reset and thermostat setback

@ October 26, 2013 7:14 PM in outdoor reset and thermostat setback

I have a Viessmann 200 that uses outdoor reset to modulate the boiler, usually there is nobody at home 13-14 hours a day for six days a week. Thermostats are programmed to 68 when no one is at home, then 71 just before I come home at night. I understand that a bigger setback often goes against the outdoor reset, but for 13-14 hours away time would a bigger setback be justified in saving fuel or should I just leave it the way it is now?

My second question is regarding the heating curve of this boiler. My bedroom is a separate zone and I set the night time temp to 68 and 71 in the morning, in reality the room temperature struggles to reach 70 (sometimes only reaches 69) after 90 minutes of preheating. I could solve it by either increasing the "slope" or "shift" on the heating curve, but I want to know which one should be adjusted first.
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