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Humidifier
Liebert
®
CRV
™
116
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 100. 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 100 General diagram—humidifier operation
NOTE
The Liebert iCOM control monitors the condition of the air discharging from the unit to protect
neighboring electronic equipment. The Liebert iCOM will prevent the humidifier from
activating if the discharge air is near its saturation point. This protects against discharging
fog from the unit or condensation forming on the unit’s supply air baffles. This protection mode
is activated when the supply air leaving the unit is below 64°F (17.8°C) or above 55% relative
humidity. The Liebert iCOM screen will display “Humidifier Suspended.” The screen will
display “Humidifier Resumed” when the protection mode resets at 67°F (19.4°C).