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Heat Loss Express
• Max Floor Temp (F) – this is a value that you enter to limit the floor temperature. If it is too low, the
system may not be able to maintain the required temperature. You can increase this value or provide
supplemental heat. Choose a value that is appropriate for the type of floor in the room and that will be
comfortable for the occupants. Note that this value must be greater than Room Temperature;
otherwise, the radiant tubing will not generate heat.
Floor Temp (F) – this is the actual floor temperature that will be maintained by the radiant tubing
system. It may be less than or equal to the Max Floor Temp.
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Floor Profile
The Floor Profile pane provides floor profile data. As you change the values for the floor types, the
system will recalculate the value in the Radiant Supply Temp (F) box. This is the required water
temperature necessary to maintain the Floor Temp value in the Heat Loss – Heated Area pane.
Floor Cover R-Value – allows you to enter the R-value for the type of floor covering. Certain items,
when selected, will result the Carpet Pad box being displayed.
Wood Floor R-Value – allows you to enter the R-value for a “finished” wood floor (if used).
Subfloor R-Value – allows you to enter the R-value for the subfloor (if applicable). For applications
where the tubing is installed in concrete, gypcrete or mortar, select “Tube in Slab” and then the
appropriate selection from the sub-menu. If the tubing is installed under the subfloor, select “Tube
Below Wood” and then the appropriate selection form the sub-menus. For applications where the
tubing is installed above the subfloor using a “dry” installation technique, select the “Luan
Underlayment” option.
Carpet Pad – this box is not displayed when the Radiant Tubing screen is opened. It is displayed only
when you select certain items in Floor Cover R-Value, and it allows you to enter the R-value for the
pad type used.
Radiant Supply Temp (F) – this is the required water temperature, and it will be recalculated as you
enter R-values for the above floor types. Values in excess of 150
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F will be displayed in red to show
that the maximum value has been exceeded. If you cannot change the floor profile, you can lower the
value by lowering the Max Floor Temp in the Heat Loss – Heated Area pane so that Floor Temp
gets lowered. This may result, however, in requiring supplemental heating. Note - changing the tube
spacing factor in the Tubing Calculator section does effect this calculation.
18 Slant/Fin Corporation