2. If the conductivity of the water is low, the canister fills and the water level reaches the canister
full electrode before the amperage set point is reached. The humidifier stops filling to prevent
overflow. Boiling should commence in time. As water is boiled off, the mineral concentration in
the canister increases and current flow also increases. The canister eventually reaches full
output and goes to normal operation. No drain is permitted until then.
3. When full output is reached the circuit board starts a time cycle which is factory-set at 60
seconds. During this repeating time cycle, the fill valve will open periodically to replenish the
water being boiled off and maintain a “steady state” output at the set point. The amperage
variance will depend on the conductivity of the water.
4. After a period of time, the mineral concentration in the canister becomes too high. When this
occurs, the water boils too quickly. As the water quickly boils off and less of the electrode is
exposed, the current flow decreases. When the current crosses the low threshold point
(factory-set at 85%) before the end of the time cycle, the drain valve opens, draining the
mineral laden water out and replacing it with fresh water. This lowers the mineral concentration
and returns the canister to “steady state” operation and prolongs canister life. The frequency
of drains depends on water conductivity.
5. Over a period of time, the electrode surface will become coated with a layer of insulating
material, which causes a drop in current flow. As this happens, the water level in the canister
will slowly rise exposing new electrode surface to the water to maintain normal output.
Eventually, the steady state water level will reach the canister full electrode and indicate so by
activating the canister full alarm. At this point, all of electrode surface has been used up and
the canister should be replaced.
6. After the entire electrode surface has been coated, the output will slowly decrease. This allows
for maintenance scheduling. During these last hours of electrode life, the mineral
concentration can increase and arcing can occur. If the electrodes start to arc, turn off the
humidifier immediately and replace the canister with the identical part.
Replacing the Humidifier Canister
CAUTION: Risk of contact with extremely hot surfaces. Can cause injury. Canister and steam
hose may be hot. Do not attempt to replace parts until the humidifier has cooled down to a
temperature that is safe for human contact. Use extreme caution and wear thermally insulated
gloves and arm protection when replacing the humidifier canister.
The proper procedure to replace the humidifier canister is:
1. Turn off the humidifier by lowering the humidity setpoint below the ambient humidity level.
Record the original setpoint.
2. Place the RUN/DRAIN switch in the DRAIN position to drain the water from the canister.
3. Return the RUN/DRAIN switch to the RUN position after the canister has drained.
4. Turn OFF the power at the main unit.
5. Remove the cover from the humidifier cabinet.
6. Locate the power wires to the steam canister. They are connected to the canister with 1/4"
quick connects. Make note of the wiring configuration before removing any wires. Refer to
schematic on unit. Slide the rubber boot back to expose the connections. Remove the two (2)
power wires and the canister-full wire. Do not loosen the screws that secure the electrodes.
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 82
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