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Author Topic: max temp for pex?  (Read 6956 times)

oldsamdog

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max temp for pex?
« on: January 03, 2011, 08:35:05 PM »
Hello, I have a Earth owf.  I have a small 12x12 heat exchanger in my duct work.  Could not install a bigger one.  What temperature do you normally run your water at?  My furnace thermostat is at least 20 degrees different than the temperature I get at my output pipe. (measuring using a laser teperature gun)  I'm wondering if my thermostat probe is not right.  Do the thermostat probes mount through the housing and set in the water or are they surface mount?  Another question, what is the maximum temperature that my 1 inch pex pipe can take?  I'm running around 173 right now acording to the thermostat but my laser says quiet a bit less.  What sort of output temperature do you normally get in your ductwork?   My maximum temperature now now is a little over 120 degrees but will drop down to a little less than 110 before the furnace kicks on.
Thanks for any answers.
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willieG

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Re: max temp for pex?
« Reply #1 on: January 03, 2011, 08:47:01 PM »
i think the max temp is around 200 f
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Scott7m

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Re: max temp for pex?
« Reply #2 on: January 03, 2011, 08:49:43 PM »
How could you not get a bigger coil in there?  Somewhere in your furnace housing should have been enough room to do something bigger I would think
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oldsamdog

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Re: max temp for pex?
« Reply #3 on: January 03, 2011, 09:26:48 PM »
I couldn't get a bigger coil in because the furance and ductwork are small.  A dinky coleman in a mobile.  I plan on moving the furnace to the house I'm currently building.  Thought I would get the tax credit here before it ran out.
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Scott7m

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Re: max temp for pex?
« Reply #4 on: January 03, 2011, 10:19:12 PM »
Oh, I've done several of those.  After a friend told me how to do them, its rather simple.  Where your a-coil sits, just grab hold of it and lift it straight up.  You can slide a 16x16 or x18 right under it and set it right back down on the furnace coil.  There is always enough slop in the line to allow you to lift it up the 3 1/2" needed to make it work. 
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juddspaintballs

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Re: max temp for pex?
« Reply #5 on: January 04, 2011, 12:30:19 PM »
The PEX should say right on the side how much heat it can take.  Usually it's rated at degrees per psi, as in 200 degrees at 15 psi or something like that...

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1grnlwn

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Re: max temp for pex?
« Reply #6 on: January 15, 2011, 08:16:13 AM »
Some cheap ideas.  Is the filter clean?  Cheap air filters give the best flow.  In a trailer are the air ducts underneath and are they insulated?  Window film insulation?  Underpinning insulation?  Caulking?  In my opinion over diving your stove could cause a lot of problems, boiling (loss of water chem) corrosion, etc?  Does your furnace run constantly?
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