How To Select The
Proper Temperature Setting
For Maximum Capacity
In any case where there is uninsulated or exposed piping at any point
where condensation would be a problem, we suggest a setting of
dew point +2F. Likewise, if the thermal sandwich is not vapor tight and properly insulated,
use dew point +2. We suggest to properly insulate and use vapor tight taping or barrier to
allow a lower offset to dew point and therefore higher capacity.
If all piping is insulated, and the back side of the “thermal sandwich” is also insulated
well and vapor tight, a target below the dew point can be used to gain more cooling
capacity. The “thermal sandwich” refers to the radiant surface, and to what is behind it.
An example below shows a typical thermal sandwich on a ceiling. The same logic is to be
applied for floor or wall use.
PEX Tubing
Aluminum Transfer Plate
Drywall, Wood, etc.
Vapor-tight Insulation
Room, Air
Above, “thermal sandwich” shown as ceiling radiant.
For floor radiant, just turn it upside down.
In the above example, assuming the piping and all insulation is vapor tight and has an R-
value of at least as high as the sandwich section marked “drywall or wood”, the only
surface where condensation risk is presented is the drywall or wood surface (the
“radiant surface”.
The temperature target offset of the CXRC1 will be based on this surface and therefore
the water temperature target can be lower than the dew point. You can use our surface
temperature calculator to estimate a safe offset. See the calculators page. Any
questions or uncertainty can be resolved by contacting Chiltrix Advanced Support
(Engineering Department).
This is the “radiant surface” and
is the area where condensation
can form if not controlled
correctly.
Thermal Sandwich
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