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General Outdoor Furnace Discussion / Re: Head pressure
« on: March 30, 2011, 09:06:32 AM »
The furnace is 125 000 but I have the wood insert in the basement ducted into the return side. As is the furnace cycles every 20 minutes with the outside temp at 20*. The extremities still get cold fast.
Here's the sheets I used to calculate the loss, this is the way they taught me in school.
Here's the sheets I used to calculate the loss, this is the way they taught me in school.
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General Outdoor Furnace Discussion / Re: Head pressure
« on: March 29, 2011, 04:05:05 PM »
The house is 2100 sqft with the basement being equal in size and three exposed walls. Windows are 1985, drafty junk and the insulation in the walls is just single baton with fibre board and brick.
I did the heat loss on my house and it works out to 185 000 btu for the main and basement at 15* outside with a inside temp of 72*, so I used 150 000 for my math which comes out to 16.6 gpm.
I'm now thinking that I should just toss my calculations and wing it because I keep reading about long runs with little pumps and there not having any issues. I just want to make sure that I'm not going to spend $15000 and not heat my brick hovel.
I can scan my heat loss calculations for you guys to see if there's any problems. I'm only a plumber and they did a one day course on heat loss, they don't want me taking others work.
The basics of the system are going to be pro series 400 gasser, 180ft of best pre insulated 1 1/4" pex and a HX in the furnace plenum, I will be adding more later when the money is back in my pocket.
I did the heat loss on my house and it works out to 185 000 btu for the main and basement at 15* outside with a inside temp of 72*, so I used 150 000 for my math which comes out to 16.6 gpm.
I'm now thinking that I should just toss my calculations and wing it because I keep reading about long runs with little pumps and there not having any issues. I just want to make sure that I'm not going to spend $15000 and not heat my brick hovel.
I can scan my heat loss calculations for you guys to see if there's any problems. I'm only a plumber and they did a one day course on heat loss, they don't want me taking others work.
The basics of the system are going to be pro series 400 gasser, 180ft of best pre insulated 1 1/4" pex and a HX in the furnace plenum, I will be adding more later when the money is back in my pocket.
4
General Outdoor Furnace Discussion / Re: Head pressure
« on: March 28, 2011, 01:34:06 PM »
I'm using this to calculate it.
http://www.taco-hvac.com/uploads/FileLibrary/SelectingCirculators.pdf
Using that to calculate, 1 1/2" line set would be 26ft of head loss.
I've seen other installs that are longer runs than mine and there still using the same pump that came with the unit or 009 pumps.
http://www.taco-hvac.com/uploads/FileLibrary/SelectingCirculators.pdf
Using that to calculate, 1 1/2" line set would be 26ft of head loss.
I've seen other installs that are longer runs than mine and there still using the same pump that came with the unit or 009 pumps.
5
General Outdoor Furnace Discussion / Re: Head pressure
« on: March 28, 2011, 12:03:44 PM »
I figured that siphon from the return would make the head pressure non existent.
Looking at those two pumps graphs, there not going to match my head loss. The head loss is 57ft and gpm is 17 for what I need using 1 1/4 line set. Would using 1 1/2 or 2" cause any ill affects aside from lowering my head loss?
Should I put checks at the boiler or just leave the ball valves, just remember to close them if the system gets opened. I don't want to add to the head loss.
Looking at those two pumps graphs, there not going to match my head loss. The head loss is 57ft and gpm is 17 for what I need using 1 1/4 line set. Would using 1 1/2 or 2" cause any ill affects aside from lowering my head loss?
Should I put checks at the boiler or just leave the ball valves, just remember to close them if the system gets opened. I don't want to add to the head loss.
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General Outdoor Furnace Discussion / Head pressure
« on: March 28, 2011, 08:30:35 AM »
I want to put in a pro series 400. The only problem I see is that where it needs to go is 210ft from HX to boiler (one way) and there's around 10-15ft of head on the boiler.
Does anyone else have a install this extreme?
Does anyone else have a install this extreme?
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