Liebert Challenger 3000

Component Operation and MaintenanceFigure 14 Canister replacementCircuit Board Adjustments!WARNINGCircuit board adjustment should be performed by qualified personnel only. Hazardousvoltages are present in the equipment throughout the procedure. Use extreme caution. Ifdesired, power may be disconnected prior to the procedure.Humidifier operation is governed by the humidifier control board. This board is located on the rightside of the humidifier compartment. There are three potentiometers mounted on the board. Thesepots can be used to adjust for extreme water conductivity conditions and capacity.The “%” pot controls the amperage at which the drain will energize. The pot is clearly marked in percentages.This adjustment is factory set at 90%, which indicates that the unit will drain when theamperage falls off to 90% of the capacity setpoint. Raising the value increases the frequency of draincycles. Lowering the value decreases the frequency of drain cycles. The frequency should be increasedfor highly conductive water and decreased for less conductive water. If adjustment is necessary, and achange of three to four percent in either direction does not permit normal operation of the unit, consultyour Liebert supplier.The pot marked “SEC” controls the duration of the drain cycle. The pot is clearly marked in seconds.This adjustment is factory set at 60 seconds and should not be readjusted without consulting yourLiebert supplier.The pot marked “CAP ADJ” is factory set at 100%. The maximum capacity is determined by a fixedresistor (R4) which is factory selected based on unit voltage.Drain Tempering FeatureAll units are equipped with a drain tempering feature which mixes cold fill water with hot drainwater to protect drain piping. This feature can lower drain water temperature to as low as 140°F(60°C), depending on water pressure. To deactivate this feature, remove the diode from socket CR18on the circuit board (lower left, above LED).57