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PURE Humidifier Co. “EC” Maintenance Instructions
The “EC” Series Electric Humidifier is designed to provide the best possible operation with minimum
maintenance. However, the humidifier should be inspected and place on a dedicated maintenance
schedule to ensure continued operation of the humidifier and its accessories. PURE Humidifier Co.
recommends that the following items be inspected, and/or, cleaned on a minimum basis of twice
a year. If excessive mineral buildup occurs, the maintenance schedule should be increased.
Maintenance & Cleaning Instructions
Inspect/Maintenance Item
Water Fill Valve
Safety Interlocks
(airflow, high-limit)
Immersion Heaters
Humidifier Cover/Tank
Tri-Probe Sensor
Drain Valve & Drain Piping
Flexible Hose
Procedure to Follow
Check to make sure the fill valve is operating properly. If the
valve appears to continually fill, check the valve seat and
seal (see Troubleshooting instructions).
Check to make sure the safety interlocks (airflow, high-limit,
etc.) will shut down the humidifier.
Verify the correct amperage is being drawn by the
heating element. Reference the wiring diagram for
correct amperage.
Inspect for any leaks. Repair as required. Remove the
mineral deposits from floor of the humidifier reservoir. If
excessive buildup is found, the cover may need to be
removed to facilitate complete cleaning of the humidifier.
Remove Tri-Probe Sensor from humidifier (set-screw and o-
ring seal) and inspect for excessive mineral buildup.
Inspect plastic housing for cracks. Probe ends should be
cleaned and the probe assembly re-installed.
The drain valve seat and seal should be inspected and
cleaned as required. The drain line and water seal should
be inspected and cleaned to ensure free flow of the overflow
and drain line.
Inspect for cracks or leaks. It is normal for the hose to
become hard and develop a “set”.
Cleaning Instructions
All humidifier tanks should be cleaned manually from the reservoir cover. Turn off the water supply,
disconnect controls by unplugging the molex in the small octagon box, disconnect power wire from
contactor and remove conduit connection from cabinet, disconnect all the hose connections from the
tank and slide the tank out of the cabinet. Remove all loose solids with a wet vacuum, stainless steel
brush, scouring pad, putty knife and/or bucket. Heaters should also be cleaned and loose build-up
removed by hand (if applicable). After removal of solids and replacing the cover you may wish to add
a de-scaling solution. DO NOT use Hydrochloric acid-based de-scalers; this will corrode stainless
steel. PURE Humidifier Co. recommends the use of a vinegar, citric acid, diluted phosphoric acid or
diluted nitric acid-based cleaner. Follow all precautions on the cleaner packaging. Some cleaners will
give off overwhelming and noxious odors, so make sure there is proper ventilation in the working area
and the steam outlet pipe is removed so that fumes are not spread throughout the building. After
cleaning the tank, flush the tank multiple times to remove any remaining acid. Drain tank completely
and allow the tank to air dry for a few hours. This will ensure that the outer protective layer of the
stainless steel will passivate and ensure corrosion resistance.
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