Installation guide

DRI-STEEM GTS Humidifier Installation, Operation, and Maintenance Manual • Page 23
Water supply piping general instructions
The GTS humidifier has a 1" (25 mm) internal air gap to prevent
back siphoning into a potable water system. However, some
governing codes may require additional protection such as a
vacuum breaker or backflow preventer.
The supply water pressure range must be 25 psi to 80 psi (172 kPa
to 552 kPa). When nonmetallic water piping is used, it must be
rated to withstand 212 °F (100 °C) or greater temperature. If not,
the final three feet of piping connected to the humidifier should be
metallic and should not be insulated.
GTS (standard water) water supply piping
The water supply assembly has a 3/8" pipe thread (DN10)
connection. Since the primary component of the water supply
assembly is a solenoid valve, there may be noise issues that surface
during a fill cycle.
During a fill cycle, the supply water drops the water temperature in
the tank and may collapse the steam, which can cause a low rolling
sound. To diminish this, adjust the factory-supplied needle valve
(installed prior to the fill valve) to decrease the water fill rate, and/
or use hot supply water.
In cases where water hammer occurs when the fill solenoid closes,
a shock arrester is recommended. Reducing the supply water
pressure (minimum 25 psi [172 kPa]) or using flexible tubing (rated
for 212 °F [100 °C] minimum continuous operating temperature)
may diminish the noise, but installing a shock arrester is the best
solution.
The minimum water conductivity for the GTS standard water
model is 100 μS/cm.
Installation
Piping:
Water supply piping