7. Loosen the steam outlet hose clamps and slide the steam hose away from the canister fitting.
Release the canister clamp along the base of the canister.
8. Remove the canister.
9. Reverse previous steps to re-assemble humidifier, paying special attention to the following:
• When replacing the wiring, connect the red wire from terminal #1 on the interface to the
red tip terminal on the canister. Reconnect the power wires as before (#2 on the left and
#1 on the right)
• When replacing the canister, always check the fill and drain solenoids for proper
operation.
11.3.4 Humidifier Circuit Board Adjustments
WARNING! Risk of electric shock. Can cause injury or death. Open all local and remote electric
power disconnect switches before working on the humidifier printed circuit board. Verify that
electric power is Off with a voltmeter prior to the procedure.
The humidifier control board governs humidifier operation. There are three potentiometers mounted on
the board and can be used to adjust for extreme water conductivity conditions.
POT2 controls the amperage at which the drain will energize and is clearly marked in percentages. This
adjustment is factory-set at 85%, which indicates that the unit will drain when the amperage falls off to
85% of the capacity set point. Raising the value increases the frequency of drain cycles. Lowering the
value decreases the frequency of drain cycles.
The frequency should be increased for highly conductive water and decreased for less conductive water.
If adjustment is necessary and a change of three to four percent in either direction does not permit
normal operation of the unit, consult your Liebert supplier.
The POT1 controls the duration of the drain cycle. This adjustment is factory-set at 60 seconds (1VDC)
and should not be readjusted without consulting your Liebert supplier.
The DIP switch settings are used to set the capacity of the humidifier. If the humidifier is replaced in the
field the DIP switches should be set to the required settings described below.
Voltage SW1 SW2 SW3 SW4 Amps
208 On On On Off 8.9
240 Off On On Off 8.5
380/415 Off Off Off Off 5.2
460 On On On Off 4.5
575 On On Off Off 3.4
Table 11.2 Humidifier control board DIP
switch settings
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 83
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