21
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
STS WITH RO/DI WATER OPTION
A fl oat valve controls the water supply — 1/4" pipe thread (DN8) connection.
European models are provided with a 3/8" pipe thread (DN10) connection.
For the end-of-season drain option, a solenoid valve is added on the inlet of the
fl oat valve. This option shuts off the fi ll water supply and drains the tank when
there is no demand for humidity for 72 hours. (This is a default setting, which is
adjustable. To modify this value, see the
Vapor-logic Installation and Operation
Manual
.)
When using nonmetallic tubing for supply water, it must be rated for 212 °F
(100 °C) minimum continuous operating temperature. DriSteem recommends
installing a three-foot (914 mm) piece of noninsulated stainless steel pipe
directly off the humidifi er prior to connecting to the nonmetallic tubing. When
using nonmetallic tubing, DriSteem recommends the installer place a 2"
(50 mm) water seal/loop in the supply line to isolate steam during RO/DI
water system maintenance.
DriSteem recommends installing a strainer in the water supply line to prevent
clogging of the fl oat valve orifi ce. A strainer is highly recommended when
the humidifi er has the end-of-season drain option. The strainer will prevent
particulate from collecting at the solenoid valve seat.
If an STS humidifi er with the RO/DI water option is supplied with tap water, the
fl oat valve assembly will become clogged and run without water.
INSTALLATION
Piping: Fill
