New Oil boiler installed

tommydee

Hello
I had a new carrier boiler with domestic hot water installed couple days ago.
My contract/paper work states "carrier 86% efficient and energy star rated"
I review the manual and even call carrier myself and they say its 84% and not energy star.
I call up the contractor who installed it, and they said its 86% because they installed a different nozzle.

How does that sound to you?

HVACNUT

What model boiler? I wasn't aware Dunkirk made a condensing oil fired boiler.

tommydee

carrier/cac/bdp
model bw5bah-140

and the nozzle is supposedly off of bw5bah- 126

Ironman

You got your wires (or keyboard) crossed, Tommy. That's an 86% boiler.

pecmsg

140K that's a lot of hot water!

https://resource.carrierenterprise.com/is/content/Watscocom/carrier_bw5bah000140_article_1391689405965_en_ss?_ga=2.69195542.645021372.1603762330-736751754.1603762330

tommydee

Ironman said:

You got your wires (or keyboard) crossed, Tommy. That's an 86% boiler.

this is what the manual says.. mine is the -140

tommydee

pecmsg said:

140K that's a lot of hot water!

https://resource.carrierenterprise.com/is/content/Watscocom/carrier_bw5bah000140_article_1391689405965_en_ss?_ga=2.69195542.645021372.1603762330-736751754.1603762330

actually not... hot water was fading out, filling my tub 1/2 way

pecmsg

tommydee said:

Ironman said:

You got your wires (or keyboard) crossed, Tommy. That's an 86% boiler.

this is what the manual says.. mine is the -140

84%

tommydee

Boilers with coils produced 3 section, 4,and 5 section with numerous btu outputs associated with numerous efficiency ratings and certifications depending on the burner nozzle installed
The 3 section boiler which you have would have a Maximum btu with the rating of 84% with the largest nozzle
Your system has the nozzle for 126,000 btu for your size home which is 86% and energy star rated
Please refer to the chart you sent me with the ratings of 126,000 btu with the .90 gph


does that make sense?????

I understand smaller nozzle means less oil, but that doesnt improve the AFUE... Because the AFUE is still a percentage.. of coarse the less oil injected to the burner so there is less going into the exhaust but it should be the same % , and actually it will be running more often to keep up with demands

Ironman

tommydee said:

Ironman said:

You got your wires (or keyboard) crossed, Tommy. That's an 86% boiler.

this is what the manual says.. mine is the -140

Look at your first post. You said 96% and 94%.

tommydee

Ironman said:

tommydee said:

Ironman said:

You got your wires (or keyboard) crossed, Tommy. That's an 86% boiler.

this is what the manual says.. mine is the -140

Look at your first post. You said 96% and 94%.

thank you.. i fixed it.. my 8's typed out as 9's

pecmsg

tommydee said:

pecmsg said:

140K that's a lot of hot water!

https://resource.carrierenterprise.com/is/content/Watscocom/carrier_bw5bah000140_article_1391689405965_en_ss?_ga=2.69195542.645021372.1603762330-736751754.1603762330

actually not... hot water was fading out, filling my tub 1/2 way

That is probably because of other factors!

140K BTU's is huge! Have a heat Load / Loss calculation done.

Ironman

Changing the firing rate MAY increase the AFUE to 86%, but if it's not certified on the boiler tag it won't count for EnergyStar.

tommydee

Ironman said:

Changing the firing rate MAY increase the AFUE to 86%, but if it's not certified on the boiler tag it won't count for EnergyStar.

thanks.. i pulled the nozzle out today it had (70b) (85) (g19) im assuming its a .85 gph.. i would like to know if that is what carrier uses in the 140k btu unit or the 127K btu unit

i called carrier and they dont have specialist there to answer technical questions

EBEBRATT-Ed

It's not just the nozzle size the oil pressure from the pump has to be taken into consideration