VAPOR PRESSURE (VP)
HWS Temperature (°F)
Vapor Pressure (ft)
System Type Radiant Floor Radiant Floor Radiant Floor Radiant Floor
90
1.68 2.47
104 113 125 125 140 150
3.5
4.56 4.56 6.65 9.02
Air Coil
European Wall Radiator Hot Water Baseboard*
* Hot water baseboard can be sized to utilize 140°F HWS
UNDERGROUND PIPING:
Use only oxygen barriered, cross linked, high density polyethylene for underground installation. Pre- insulated PEX pipe manufactured by ComfortPro or Uponor is strongly recommended. Underground piping must be designed to allow for expansion and installed in strict compliance with the manufacturer’s specific instructions (such as the Microflex installation guide)
http://www.comfortprosystems.com/pdf/MFInstallGuide2009rev1web.pdf
DO NOT install copper, steel, polybutylene or PVC pipe underground. DO NOT join pipe underground unless absolutely necessary. If required use ONLY materials provided by the pipe manufacturer and installed according to their specific directions. In very cold climates place a sheet of 2” thick x 24” to 48" wide foam insulation (blue, pink, yellow or green) board immediately above the pipe, centered on the pipe before back filling the trench. Trench depth in cold climates should be 4 feet (grade to top of pipe) if possible. Deeper burial and additional insulation is required when below grade piping extends beneath a parking lot or roadway (frost will normally penetrate the soil to a greater depth in such areas). Pressure test for water leaks before back filling the trench. If the piping can only be positioned above frost depth, provide a pump timer to circulate water for five to ten minutes every hour during the heating season. Avoid burial in continuously wet soils, under creeks, natural land depressions, drainage ponds, etc. DRY AREA BURIED PIPING DIAGRAM: The following diagram shows how preinsulated, underground PEX-a piping shall be laid in dry areas. Trench with a “ditch witch” to a de pth below the frost line.
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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