Pure Humidifier ERDDR Series, Installation Instructions, Operation And Maintenance Manual

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PURE Humidifier Co. “ERDDR” Maintenance Instructions
The “ERDDR” Series Electric Humidifier is practically maintenance - free. However, the humidifier should
be inspected and placed 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 makeup float valve
Low water float switch
Safety interlocks
(airflow, high - limit)
Immersion heaters
Humidifier cover/tank
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 adjustment or valve seat and seal
(see Troubleshooting instructions).
Check to make sure the switch will shut the
humidifier off when the water level drops too low.
Open the drain valve to allow water to drain out for
checking purposes. Make sure to close the drain
valve after inspection is completed.
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 heater assembly and remove mineral
deposits from floor of the humidifier reservoir.
Inspect for cracks or leaks. It is normal for the
hose to become hard and develop a “set”.
Replace as needed.
Cleaning Instructions
Normally ERDDR reservoirs do not need to be cleaned when fed with high purity water. If fed with low
purity water reservoir cleaning may be needed. The tank should be cleaned manually from the
reservoir cover. Turn off the water supply on/off isolation valve (by others). Turn off power to the unit,
disconnect steam supply hose and remove cover. 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 buildup 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
.