Brrrrrrr.

Wayco Wayne_2

one call from a recent boiler change out where I downsized from a great big CI to a modcon more closely sized. The main house is an old gravity system. There is a newer addition where there is a kitchen and a family room. The family room is a sunken room lower than the rest of the house. the family room was not heating us properly. After observing, there were several things going on. Whoever did the heating install in the addition did a poor job. There are 2 cast iron rads and 4 cast iron baseboards, ALL piped in series. Not good. The main house tstat was set at 72 and the house temp was hovering at 70. While the main house was still calling the boiler couldnt go above 140 degrees water temp, even though the target temperature was 160. I turned the tstat of the main house down to 70 and with the zone turned off the boiler easily reached it's set point. The old house also has infiltration issues. There are holes in the basement wall where pipes leave to go to the crawlspace where cold air is blowing in with great velocity. To me this indicates a chimney effect going on, where hot air is leaving the house upstairs and drawing in the cold air downstairs. With the old boiler it was greatly oversized and could overpower these problems with a lot of high temp capacity, although the sunken family room still suffered though not as much. I recommended a blower door test but the customer seemed hesitant. Sounds like I'm really close to the real heat loss on this one. If they tighten up it and corrected the piping issues, it would be perfect. BTW their gas bill is down 30% from last years avg.

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Wayco Wayne_2

Woke up this morning

and my weather station sez it's 3 degrees outside. This is colder than it usually gets here in MD where the design temps are 17. Yikes! Makes me think of the boiler replacements where I've downsized to be closer to the computerized heat loss. I sure hope there's a little cushion in my program for days like this. WW

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Chas_4

No Cushion Here

Design temp here is 7 and Poof, at 6 degrees the max I get is 69, it drops fast from there. Thank god for Blankets and the sun. s I renovate, my design temp will be changed to 4.

Larry (from OSHA)

-15

The other night it was about -15 here and my Knight 80 kept us a toasty 70. It wasn't even firing at 100%. And the house is more comfortable than when the old 133,000 btu boiler was doing its' job.

Larry

Mitch_4

cushion

computer software said I needed 50k, installed a 2 stage 60k high eff FAF 95%. As an experiment disconnected 2nd stage, so I am firing at 36K input 34K out, I am currently 15° below the design temp I used(25 with wind chill) and I am still keeping up. We have never been so comfortable

There is cushion...

BTW I pulled a 125,ooo standard furnace out..tells you about old timers oversizing when fuel was cheap

Unknown

why?

wouldn't it be better to tell your client that one cold day every few years means they are saving lots of money every other day of every year?

Dave Stroman

Our design temp. is -5. Supposed to get to -3 tonight. I don't worry so much about boiler size as I do heat emitters. Like staple up radiant floors.

Dave Stroman, Denver

SpeyFitter

3 degrees?

Heck, that's spring up here in Aroostook County, Maine...
Check this out.

http://i27.tinypic.com/1zf33tl.jpg

Stay warm.
-Charles