GeneralAire DS20 Elite Steam - Manual (Page 15)

Installation, Operating and Maintenance Manual
If during a shut-down the cylinder needs to be emptied, (which is recommended for seasonal
shut down) press the drain button (down arrow) and hold until the water has been completely
emptied, before disconnecting power from the unit.
In the event of a malfunction of the drain valve, the cylinder can be emptied by lifting it from the
bottom connection and slowly pouring the water into the drain pan.
OFF
Press the bottom of the On/Off rocker switch (O) and check that the
LEDs on the display panel are all out.
open the main power switch to the humidifier;
close the water shut-off valve to the humidifier.
8. Operating Principle And Other Functions
Operating principle
On a call for humidity, a power contactor closes
and sends power to the electrodes (11) in the
plastic cylinder (10). After a short delay, the fill
valve (1) opens and water flows into the fill cup
(3 to 7), covering the conductivity probes (6).
The controller reads the water conductivity and
remembers it. Water then flows through the
tubing (4) and into the bottom of the cylinder
(12) by gravity. As it rises over the electrodes
(11), electric current begins to flow through the
water and the water warms. Eventually the
water begins to boil into steam, which exits the
cylinder (9) into the steam hose and then into
the air duct. The steam output is directly
proportional to the amount of electrode covered
by water. If the amperage rises too high, the
controller will open the drain valve (14) and
drain off some water. As water is boiled off, the
fill valve (1) will open and replace it. As water is
boiled off, mineral will begin to build up in the
cylinder, so periodically the controller will open the drain valve (14) and drain some of the mineral
laden water away and replace it with fresh water. If the water rises too high, or foaming occurs,
this is detected by the cylinder full electrodes (8).
Anti-foam procedure
Some types of supply water foam during operation. When the humidifier detects the presence of
foam, a special drain/fill procedure is activated to eliminate the foam. The procedure consists of
repeated draining, and in more critical situations complete draining of the cylinder.
Automatic draining of the cylinder for extended shut-down
If the humidifier remains powered but there is no call for humidity for a period of more than 7 days,
the water contained inside the cylinder is completely drained. This function prevents the corrosion
and rusting of the electrodes.
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