41
VAPORMIST INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
OM-778-3
MAINTENANCE
Humidifier De-scaling Solution
Scale buildup on humidifi er heaters acts as
an insulator, reducing humidifi er performance
while increasing energy costs. To keep
humidifi ers operating as effi ciently as possible,
remove scale with DriSteem's Humidifi er De-
scaling Solution, available for purchase from
your DriSteem representative or distributor.
The De-scaling Solution cleans without risk
of corroding humidifi er tanks or welds. The
De-scaling Solution also cleans surfaces
unreachable by hand scraping.
DriSteem's Humidifi er De-scaling Solution is the
only approved cleaner/de-scaler for use with
DriSteem humidifi ers. Use of other cleaners/de-
scalers may void your DriSteem warranty.
mc_021908_1410
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 humidifi er; otherwise the tank could stay hot for
several hours.
• Insulated and uninsulated tanks will have hot surfaces.
• Verify that there is no call for humidity and that the aquastat set point
(adjusted using the keypad/display Setup screens) is less than room
temperature (default setting is 40 °F [4 °C]) so that the heaters do not
energize while cooling down the tank.
• Models with a standard drain valve:
– Manually open the drain valve by moving the valve lever located on
the back of the drain valve to the manual open position. The fi ll valve
eventually opens.
– Let the fi ll water run until the tank is cooled, then shut off the fi eld-
installed manual supply water shut-off valve.
– Let the tank drain, then manually close the drain valve.
• Models with optional drain valves:
– 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 fi ll valve opens and the
humidifi er cools down.
– When the fi ll valve closes, select Manual Drain in the Control Modes
screen and let the tank drain dry. The humidifi er should be cool enough
to work on.
– For more information about using the keypad, see the Vapor-logic
version 5 Installation and Operation Manual.
mc_060210_1715
Tap/softened water
FIGURE 41-1: COVER ENCLOSURE
SCREW CAP DETAIL
INSPECTION AND MAINTENANCE
1. Annually (also recommended when maintenance is performed)
• Inspect tank and gaskets for leaks.
• Measure current draw of heaters and verify amp values per stage by
comparing to the wiring diagram located inside the subpanel cover. This
identifi es any burned out heaters. Only qualifi ed electrical personnel
should perform this task.
• All safety devices in the control circuit should be cycled on and off to
verify they are functioning. These include:
– High limit switch
– Airfl ow proving switch
– Low water level probe. Pull out probe plug; fi ll valve should energize.
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