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DRISTEEM GTS HUMIDIFIER INSTALLATION AND OPERATION MANUAL
The drain line piped from the humidifi er must be run to an approved sanitary waste or suitable drain. Although the GTS
humidifi er is equipped with integral water tempering, if nonmetallic drain pipe or hose is used, DriSteem recommends it
be rated for 100 °C minimum continuous operating temperature.
• Minimum drain pipe size is DN40 inside diameter. Do not reduce the size of the drain piping. If the length of the
drain piping exceeds 3 m, increase the pipe size. If combining multiple drain lines, ensure proper common pipe
sizing practices are used.
• Do not install the humidifi er directly above a fl oor drain — skim and drain water dumped into the drain will cause
fl ash steam, which will rise and saturate electrical components, adversely affecting their life and performance.
• An open drain with a 25-mm air gap between the drain piping and the drain is required. Locate the air gap only
in spaces with adequate temperature and air movement to absorb fl ash steam; otherwise, condensing on nearby
surfaces may occur.
• Drain piping downstream from the water seal must be pitched a minimum of 1% toward the drain. Governing codes
may require more pitch.
• If the proximity of a drain requires the humidifi er drain and skim water to be lifted, use a water pump with capacity
of at least 45.4 liters per minute. A check valve is required on the discharge of the pump. Electrical power for the
pump is independent of the humidifi er.
• The GTS humidifi er has an auxiliary DN40 drain outlet below the subpanel. This drain outlet can be hard-piped
during installation to enable rapid tank draining before maintenance. Next to this outlet is a cleanout plate that
provides access for removing scale from the tank bottom.
Drain piping