H2O temps thru Pex

Bob_9

I've got a guy who has a Laars EPB-175. They have 2 air handlers with hot water coils, radiant in concrete and Quick-Trac under some tile floors. The way it's piped is that there is one supply header feeding the same temp to all items. There is a 3-way mixing valve to reduce the temp thru the Quick-Trac but no other device to reduce the temp thru the radiant in the concrete.
Is it acceptable to run the same 170 to 180 deg. H2O required for the air handlers thru the pex in the concrete?
Thanks,
Bob

kevin coppinger_4

it's possible....

but not reccomended... long term that could very well crack the slab...are you sure that there is no mixing going on at a different point?...kpc

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Bob_9

There is no mixing for water into the slabs. Doesn't the slab always have the possibility of cracking. How does water temp heighten the chance of cracking?

Craig Bergman

150

> I've got a guy who has a Laars EPB-175. They have

> 2 air handlers with hot water coils, radiant in

> concrete and Quick-Trac under some tile floors.

> The way it's piped is that there is one supply

> header feeding the same temp to all items. There

> is a 3-way mixing valve to reduce the temp thru

> the Quick-Trac but no other device to reduce the

> temp thru the radiant in the concrete. Is it

> acceptable to run the same 170 to 180 deg. H2O

> required for the air handlers thru the pex in the

> concrete? Thanks, Bob

Craig Bergman

150

Degrees is the MAX temp for concrete.

Bergy