Emerson Liebert ICOM-DO Installation Manual download pdf (Page 65)

Humidifier

APPENDIX A-HUMIDIFIER

A.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 50. 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 50 General diagram—humidifier operation

A.1.1 Humidifier Water Supply and Plumbing

The fill valve is sized for an extended water pressure range of 30 to 80 psi.

For installations where water pressure is less than 15 psi, add a pressure boost pump and notify the

factory; a fill valve with an oversized opening will be supplied.

For installations where water pressure is greater than 80 psi, install a pressure reducing valve in the

water feed line to the unit.

With dirty or muddy water sources (e.g., some well sources), ensure proper filtration by adding an

external filter to the water line entering the unit. (Consult factory for accessories such as filters.)

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Emerson Liebert ICOM-DO Installation Manual Page 65