(April, 2013)
DRH Series GEN1 Ultrasonic Humidifi er Installation, Operation & Maintenance Manual
4-1
4.0
MAINTENANCE/REPAIRS
4.1 Periodic General Maintenance
Systematic, preventive maintenance of the humidifi er is recommended for optimum system performance. Rou-
tine periodic maintenance should include, but is not limited to the following:
Tightening electrical connections.
Cleaning, inspecting the unit’s components visually.
Checking the level of water and ensuring no leaks are present.
A system should be established to record any problems, defects or defi ciencies noted by operators and discov-
ered during maintenance inspections, together with the actions taken. For assistance, contact STULZ Product
Support (see Section 5.0). Ensure adherence to all safety precautions while performing any type of mainte-
nance.
4.1.1 General
Before the maintenance inspection and repairs are done, be sure to set the control box power switch to “Off”
and close the water supply valve.
WARNING
Turn off power to the unit unless you are performing tests that require power. With power and controls
energized, the unit could begin operating automatically at any time.
Solid scaffolding must be provided for working in high places.
Care must be taken avoid injury by sharp edges of the sheet metal, etc.
CAUTION
The transducer is a very delicate part. When the water tank interior is cleaned, special care must be taken
to ensure the transducer is not scratched on the surface with a screwdriver, etc.
Do not supply power to the ultrasonic nebulizer units while the transducer lead wires (yellow and orange)
are removed.
Proper tools must be used. Excessive tightening or insuffi cient tightening may cause failure.
When performing maintenance or repairs, care must be taken to ensure small parts such as screws will
not be lost.
Testing insulation resistance and dielectric withstand voltage should be avoided because the humidifi er
incorporates sensitive electronic parts.
When parts are replaced, genuine STULZ parts must be used. Contact STULZ Product Support for
assistance.