1217.0 Radiant Heating and Cooling
- 85°F (29°C) in general occupied applications.
- 90°F (32°C) in bathrooms, foyers, distribution areas such as hallways and indoor swimming pools.
- 88°F (31°C) in industrial spaces
- 95°F (35°C) in radiant panel perimeter areas, i.e., up to 2.5 feet (762 mm) from outside walls.
The radiant heating system temperature shall not exceed the maximum temperature rating of the materials used in its construction.
For the purpose of system balancing, each individual loop shall have a tag securely affixed to the manifold to indicate the length of the loop and the room(s) and area(s) served.
TABLE 1217.4 MAXIMUM LENGTH OF CONTINUOUS TUBING FROM A SUPPLY-AND-RETURN MANIFOLD ARRANGEMENT
|NOMINAL TUBE SIZE (inches)||MAXIMUM LOOP LENGTH (feet)|
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm
Where tubing is installed above or in the subfloor, the tube spacing shall not exceed 12 inches (305 mm) center-to-center for living areas.
Where tubing is installed in the joist cavity, the cavity shall be insulated with not less than R-12 material below the heated space.
An air space of not less than 1 inch (25.4 mm) and not more than 3 inches (76 mm) shall be maintained between the top of the insulation and the underside of the floor unless a conductive plate is installed in accordance with manufacturer's instructions.
Where tubing is installed in panels above or in the subfloor and not embedded in concrete, the floor assembly shall be insulated with not less than R-5 material below the tubing when installed over habitable space.
An air space of not less than 1 inch (25.4 mm) and not more than 3 inches (76 mm) shall be maintained between the insulation and the interior surface of the panel unless a conductive plate is installed.