(April, 2013)
DRH Series GEN1 Ultrasonic Humidifi er Installation, Operation & Maintenance Manual
2-3
CAUTION
It is essential that DI or RO water be used as the supply water source to maintain warranty coverage. The
use of untreated water will VOID THE WARRANTY.
NOTE
The water supply piping must be non-corrosive stainless steel or poly tubing rated for use with de-ionized water.
Prepare the water supply piping. The water supply piping should be equipped with a water supply valve for
maintenance purposes (user provided) at a place as close as possible to the humidifi er. The valve must be
rated for use with DI water. After the water supply valve is installed, fl ushing should be done by supplying water
(see Section 3.1, “Purge the Water Line”). This is a necessary step to prevent chips and oil in the piping from
entering the humidifi er.
Locate the water fi lter/strainer assembly (shipped loose) and apply tefl on tape to the threaded end. Ensure the
tape does not extend over the fi rst two threads on the fi tting (
to prevent any pieces of tape from entering the
water stream
). Hand screw the fi lter/strainer assembly into the water inlet fi tting in the side of the humidifi er until
some resistance is felt. Then using an open end wrench on the reducer fi tting, screw the assembly 1 full turn to
fully tighten it. DO NOT tighten the fi lter/strainer by grasping the plastic body.
The fi lter/strainer is equipped with a ¼” compression fi tting (see Figure 3). Connect the water supply piping to
the humidifi er by means of a 1/4” stainless steel or poly tubing (user provided). Use two adjustable wrenches to
tighten the connection on the humidifi er. (Tightening torque: approximately 90 in/lbs). If there is a risk that the
water supply piping could freeze, wrap the piping with insulating material..
Figure 3- Water Inlet Filter/Strainer
FLOW
¼ Compression
Fitting
Figure 4- Piping Connections
Humidifier
To Drain
(Include Air Gap)
Drain Line
Water Supply Piping
Water Supply Valve
Water Supply
Filter/Strainer
Provided By User
A drain line rated for use with DI water must be provided from the I/8” NPT water tank drain stub in the side
of the unit. Connect the drain line to the stub so that overfl owing water can be directed into a drain pan or an
appropriate place such as an open building drain with an air gap per local and national plumbing codes. The
drain line must meet local and national plumbing codes, be sloped downward and away from the humidifi er
,
include and air gap, and the end should not be obstructed.