What Temp for Hydro Air

Supply House Rick

Is this a house or a poorly insulated airport hanger? Do you have a copy of the heatloss performed on this structure? If not you should get one...

Rick

Augie

Hydro Air Temp

I have a new house with a Hydro air system with 2 zones with there own air handlers(Caarrier) feed by 1 Larrs 225 btu minithrem boiler with a set point @ 180 degrees

What would think the temperature of the heated air at the registers should be ?

My system reads 140 + degrees at the closest register to the coil, and I am thinking about lowering it and or putting an outdoor reset in.

Augie

Ray M

wow

You must have a large house for such a big boiler! Only two air handlers? The temperture depends on the manufactures coil. They have a chart showing BTU@EWT@GPM.

Ray M

Robert O'Brien

Ray

Probably not that big! More than likely the conversation went like this, Billy Bob :"I seen a house like this once and it had a 175k BTU boiler" Jethro: "In that case we better use 225K because you never know,you know?"

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jp_2

so,

you can tell if a boiler is properly sized just by knowng the size of the boiler?

Ray M

I do a heat loss they do a walk through. 5 ton's here 125k coil.It will work fine.

Ray M

Robert O'Brien

No

I can't. But If Augie wants to provide prints,we can do a heat loss and if the 225K boiler in his house is not oversized by 20%.I will donate $100 to Dan's charity of choice. We on?

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Ray M

I have installed smaller boilers in 8k square foot home's with 6 air handlers. There is a thing called diversity.

Hope this helps
Ray M

Ted_9

Devil's Advocate

I googled this. The output is about 185,000 btu's. I also beleive the boiler is over sized though. Just wanted to throw that info out there.

http://www.laars.com/productdetail.htm?ProductLineID=JV&PicFile=JV

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jp_2

laars web site

as ted said, the 225 has an output of 186.

as you say, if the 225 is 20% oversized, that would be a heatload of 155,000btu.

the next smaller boiler is at 133,000(output) so the installer would have to oversize or undersize by 22,000 btu. how many installers typically undersize?

from nearly all the recent posts, boiler problem posts seem to be grossly oversized, I was just giving you a hard time, no facts give you no answers, onlly questions.

maybe its a huge house, 5 kids, tons of big window, northern minnesota, outdoor year round 500gal hot tub? do we know?

jp_2

augie,

my question would be, whats the register temps farest from the coil?

that will be the determining factor. if its too low, of course, that area will be uncomfortable.

so give us some details:

house sq ft.

where are the two air handlers, 1st floor 2nd floor

normal winter lows

other 'stuff' connected to the boiler