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ALL DRAIN AND CONDENSATE PIPING MUST BE INSTALLED IN ACCORDANCE TO LOCAL PLUMBING CODES.
HIGH CHLORIDE CONTENT IN FEED WATER CAN CAUSE CHLORIDE STRESS CRACKING AND CHLORIDE PITTING
IN STAINLESS COMPONENTS. CHLORIDE STRESS CORROSION CRACKING (CSCC) AND CHLORIDE PITTING OF
STAINLESS STEEL COMPONENTS IS NOT COVERED BY WARRANTY.
Water Supply Piping
Supply pressure: 35-95 psi optimal
This style of humidifi er utilizes a Tri-Probe conductive type water control system which is designed for use with standard
(hard or softened) tap water. Use of demineralized, deionized or reverse osmosis water will cause failure of the water level
control system and void the humidifi er warranty.
Install stainless pipe on make-up water line within 5 feet of humidifi er fi ll valve connection. If plastic pipe is used beyond
this point a check valve is required to prevent steam from entering the plastic section in the event that the water treatment
system runs out of water.
Cold or hot standard tap water can be supplied to the humidifi er. A minimum water pressure of 35 psi (2.4 Bar) should be
maintained to provide the proper water level within the humidifi er. If the water pressure is above 95 psi (6.6 Bar), the valve
may not shut off . The humidifi er has a factory built-in 1.5” (4 cm) air gap between the water inlet and the overfl ow. Local
codes should be checked to see if the addition of a vacuum-breaking device is required.
Drain Piping
A water seal as shown in the piping illustration should be installed to prevent steam from escaping through the drain line.
The water seal should be of suffi cient height to overcome the pressure developed in the humidifi er (reference water seal
height table) and the duct static pressure.
The drain piping should be stainless steel. The use of PVC piping is not recommended; the humidifi er temperature will
cause the PVC to soften and fail.
If gravity drain is not possible please use a condensate pump rated for 212°F water or contact a PURE Humidifi er Co.
Representative to purchase one.
Local codes may require tempering of 212°F (100°C) water before entering drain. The PURE Humidifi er Co. DCT-927 Drain
Tempering Kit will temper water to 140°F (60°C).
Water Supply & Drain Piping
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