8 HUMIDIFIER—600-MM (24-IN.) UNITS ONLY
8.1 Principal of Operation
When the Liebert iCOM calls, the cylinder fills to 100% of the Full Load Amperage (FLA) or to the top of
the cylinder, whichever comes first. See Figure 8.1 below. If it reaches 100% FLA, the water heats and boils
away to a level giving 80% FLA. An electronic timer uses the rate of amp fall to determine the water level.
The objective is to concentrate current carrying minerals in the cylinder so that a smaller volume of water
is required to produce the rated steam output. This extends the life of the disposable cylinder by
minimizing electrode coverage and reducing energy use because the high concentration allows a minimal
drain rate. When 80% FLA is reached, the fill valve will open, refilling the cylinder to 100% FLA. On
occasion, the drain valve will also come on if the water level is too low, indicating too high a concentration
and the need to dilute the water in the cylinder. If the water reaches the top of the cylinder before 100%
FLA, the fill valve shuts Off via the sensor, and the fill-boil-fill-boil cycle continues, cycling Off the red high
water sensor light until the concentration becomes high enough to reach 100% FLA. The above-
described control process will then take over.
Figure 8.1 General diagram—humidifier operation
ITEM DESCRIPTION ITEM DESCRIPTION
1 Inlet chamber 9 Cylinder
2 Fill chamber 10 Drain pan
3
Water over-flow chamber
(safety drain in case of fill-valve/control-board failure)
11 Drain valve
4 1-in. air gap 12 Drain canal (open to atmosphere)
5 Fill cup 13 Drain connection
6 Condensate return (optional) 14 Fill valve
7 Steam hose 15 Strainer
8 Electrodes 16 Tap-water supply
Vertiv | Liebert CRV Installer/User Guide | 81
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