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HVAC Discussions - Heating, ventilation and air conditioning.
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Posted by Farmerron on April 3, 2008, 1:12 pm
Farmer Ron
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Okay, this is a weird one, but... we're farmers, so everything here is
weird. Maybe someone here will be inspired by our "challenge" and help us
out!
I have a very "home built" hydronic heating system in our 1500 sq ft farm
greenhouse. It's awesome... we save hundreds of dollars each spring in
propane because we just heat the benches instead of the air. The plants
grow faster too with warm roots.
It's a is that it's a leaky system, which I don't mind... mice nibble at
things, etc. we're always adding in 2-3 gallons of fresh water each day,
but who cares, we're in a greenhouse with dirt floors... The PROBLEM is
that there seems to always be "new air" coming into the system and when it
gets into our "boiler" it stops working.
I have two air vents in the system one before and one after the boiler. I
have two taco 007 circulator pumps moving the water around. Our "boiler"
is an Bosch Aquaster instant on hot water heater that kicks on when 1/2
gallon a minute of water is flowing through it. Please note we've been
using this system for 7 years as is now... so it works... it's just that I
have to keep manually "purging" the system by opening strategically placed
faucets to get the air out, and sometimes, if it runs a lot at night, it
shuts down unless I wake up at 3AM to re-purge it. The money we save
actually makes it worth it, but I'm getting old and it's cold and I just
wish it would work.
Our boiler is basically at the same level as out benches. The top of it is
a couple feet higher, actually. Could that be why the air gets stuck in
there instead of purging out the air purge things? I have tried replacing
the air purge vents, but that does nothing for me.
Does anyone have any thoughts about this?
THANK YOU!
Ron
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Posted by Reno on April 21, 2008, 4:14 pm
If you have even a small amount of leakage then that would be the cause of
new air in the system. You need to repair the leaks. Whenever the system
idles without the heat on it cools and there is a negative pressure which
sucks a bit of air in.
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