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CCAAUUTTIIOONN Improper power phasing can result in equipment damage due to reverse rotation. Do not use untreated or improperly- treated water. Equipment damage may occur. • Fill the evaporator chilled-water circuit. Vent the system while it is being filled. Open the vents on the top of the evaporator water box while filling and close when filling is completed. The use of improperly-treated or untreated water in this equipment may result in scaling, erosion, corrosion, algae, or slime.The services of a qualified water- treatment specialist should be engaged to determine what treatment, if any, is advisable.Trane's warranty specifically excludes liability of corrosion, erosion, or deterioration ofTrane equipment. Trane assumes no responsibilities for the results of the use of untreated or improperly-treated water, or saline or brackish water. • Close the fused-disconnect switch(es) that supplies power to the chilled-water pump starter. • Start the chilled-water pump to begin circulation of the water. Inspect all piping for leakage and make any necessary repairs. • With water circulating through the system, adjust the water flow and check the water pressure drop through the evaporator. • Adjust the chilled-water flow switch for proper operation. WWAARRNNIINNGG Use extreme caution when performing the following procedure with power applied. Failure to do so can result in personal injury or death. • Reapply power to complete the procedures. • Prove all Interlock and Interconnecting Wiring Interlock and External as described in the Installation section. • Check and set, as required, all UCM-CLD menu items. • Stop the chilled-water pump. • Energize the compressor and oil separators 24 hours prior to unit startup. Unit Voltage Power Supply Voltage to the unit must meet the criteria given in the Installation section. Measure each leg of the supply voltage at the main power fused-disconnect switch for the unit. If the measured voltage on any leg is not within the specified range, notify the supplier of the power and correct the situation before operating the unit. CCAAUUTTIIOONN Provide adequate voltage to the unit. Failure to do so can cause control components to malfunction and shorten the life of relay contact, compressor motors and contactors. Unit Voltage Imbalance Excessive voltage imbalance between the phases of a three-phase system can cause motors to overheat and eventually fail.The maximum allowable imbalance is 2%. Voltage imbalance is determined using the following calculations: % Imbalance = [(Vx -V ave) x 100]/V ave V ave = (V1 + V2 + V3)/3 Vx = phase with the greatest difference from V ave (without regard to the sign) For example, if the three measured voltages are 391, 407, and 402 volts, the average would be: (391+407+402)/3 = 400 The percentage of the imbalance is then: [100(400-391)]/400 = 2.25% This exceeds the maximum allowable (2%) by 0.25% Unit Voltage Phasing It is imperative that L1, L2, and L3 in the starter be connected in the A-B-C phase sequence to prevent equipment damage due to reverse rotation. It is important that proper rotation of the compressors be established before the unit is started. Proper RLC-SVX03A-E4 Operation motor rotation requires confirmation of the electrical phase sequence of the power supply.The motor is internally connected for clockwise rotation with the incoming power supply phased A-B-C. When rotation is clockwise, the phase sequence is usually called "ABC;" when counterclockwise, "CBA."This direction may be reversed outside the alternator by interchanging any two of the line wires. It is this possible interchange of wiring that makes a phase sequence indicator necessary if the operator is to quickly determine the phase rotation of the motor. 1. Press the Stop key on the UCMCLD. 2. Open the electrical disconnect or circuit protection switch that provides line power to the line- power terminal block(s) in the starter panel (or to the unit- mounted disconnect). 3. Connect the phase-sequence indicator leads to the line power terminal block as follows: Phase Sequence LeadTerminal Black (Phase A) L1 Red (Phase B) L2 Yellow (Phase C) L3 4.Turn power on by closing the unit supply-power fused-disconnect switch. 5. Read the phase sequence on the indicator.The "ABC" LED on the face of the phase indicator will glow if the phase is "ABC." WWAARRNNIINNGG To prevent injury or death due to electrocution, take extreme care when performing service procedures with electrical power energized. 6. If the "CBA" indicator glows instead, open the unit main-power disconnect and interchange two line leads on the line-power terminal block(s) (or the unit- mounted disconnect). Close the main-power disconnect and recheck the phasing. Do not interchange any load leads that are from the unit contactors or the motor terminals. Doing so may damage the equipment. 7. Reopen the unit disconnect and disconnect the phase-sequence indicator. Water-System Flow Rates Establish a balanced chilled-water ...

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