Specifications

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Figure 36-1:
Cover enclosure screw cap detail
OM-778-3
Humidifier De-scaling Solution
Scale buildup on humidifier heaters acts as an
insulator, reducing humidifier performance while
increasing energy costs. To keep humidifiers
operating as efficiently as possible, remove scale
with DRI-STEEM's Humidifier De-scaling Solution,
available for purchase from your DRI-STEEM
representative or distributor.
The De-scaling Solution cleans without risk
of corroding humidifier tanks or welds. The
De-scaling Solution also cleans surfaces
unreachable by hand scraping.
DRI-STEEM's Humidifier De-scaling Solution is
the only approved cleaner/de-scaler for use with
DRI-STEEM humidifiers. Use of other cleaners/
de-scalers may void your DRI-STEEM warranty.
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Maintenance
Inspection and maintenance
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stage by comparing to the wiring diagram located inside the
subpanel cover. This identifies any burned out heaters. Only
qualified electrical personnel should perform this task.
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and off to verify they are functioning. These include:
– High limit switch
– Airflow proving switch
– Low water level probe. Pull out probe plug; fill valve
should energize.
Cool down humidifier
Before performing any maintenance, allow the tank to cool down.
Fresh make-up water is used to speed up cooling. Do not close the
manual water supply before cooling down the humidifier; otherwise
the tank could stay hot for several hours.
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point (adjusted using the keypad/display Setup screens) is less
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the heaters do not energize while cooling down the tank.
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– Manually open the drain valve by moving the valve lever
located on the back of the drain valve to the manual open
position. The fill valve eventually opens.
– Let the fill water run until the tank is cooled, then shut off
the field-installed manual supply water shut-off valve.
– Let the tank drain, then manually close the drain valve.
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– For drain valves without the manual open lever, use the
keypad to perform the cool down process.
– Go to the control modes screen and select Manual Drain.
– Allow approximately half the water to drain out of the tank.
– In the Control Modes screen select Auto; the fill valve opens
and the humidifier cools down.
– When the fill valve closes, select Manual Drain in the
Control Modes screen and let the tank drain dry. The
humidifier should be cool enough to work on.
– For more information about using the keypad, see the
Vapor-logic4 Installation and Operation Manual.