System Testing And Maintenance
Liebert
®
Mini-Mate2
™
62
9.3.4 Humidifier Circuit Board Adjustments
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 setpoint. 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 Emerson supplier.
The POT1 controls the duration of the drain cycle. This adjustment is factory set at 60 seconds and
should not be readjusted without consulting your Emerson supplier.
The POT3 control is factory set at 100%. The maximum capacity of the system is factory set,
subsequently no field adjustment is possible.
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 (see Table 25).
WARNING
Risk of electric shock. Can cause injury or death.
Open all local and remote electrical power disconnect switches before working on the
humidifiers printed circuit board. Circuit board contains hazardous voltage. Adjustment
should be performed by properly trained and qualified personnel only.
Table 25 DIP switch settings for humidifier control board
Voltage SW1 SW2 SW3 SW4 Amps
208/230 On Off On Off 4.0
220/240 Off Off On Off 3.7
277 Off On Off Off 3.1
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