Trane Stealth™ Air-Cooled Chiller SCWF20

Verify the fan motor is properly lubricated

Note: The bearings are manufactured using a special synthetic lithium-based grease designed for long life and minimum lube intervals. Over lubrication can be just as harmful as not enough.

With power disconnected, manually rotate the fan wheel to check for obstructions in the housing or interference with fan blades. Remove obstructions and debris. Center the fan wheel if necessary.

Check the fan assembly sheave alignment. Tighten set screws to their proper torques.

Check water valves for leakage at valve stem packing nut.

Note: Perform this procedure monthly if the unit is in a coastal or corrosive environment.

Sign off on the 6 Monthly Stealth™ Air-Cooled Chiller Maintenance

Proper Water Treatment Required!

The use of untreated or improperly treated water could result in scaling, erosion, corrosion, algae or slime.

Use the services of a qualified water treatment specialist to determine what water treatment, if any, is required. Trane assumes no responsibility for equipment failures which result from untreated or improperly treated water, or saline or brackish water.

Condensing water contains minerals that collect on the condenser tube walls. Cooling towers also collect dust and foreign materials that deposit in the condenser tube. The formation of scale or sludge in the condenser is indicated by a decreased water flow, low temperature difference between inlet and outlet water, and abnormally high condensing temperatures.

To maintain maximum condenser efficiency, the condenser must remain free of built-up scale and sludge. Clean the condenser either mechanically or chemically.

1. Disconnect all electrical power to the unit.

2. Wear appropriate personal protective equipment (PPE).

3. Access both sides of the coil section.

Measure fan belt tension with a Browning, Gates, or equivalent belt tension gauge. Determine deflection by dividing the belt span distance (in inches) by 64. See Figure 42, p. 89. Use the following procedure to measure belt tension:

1. Measure belt span between centers of sheaves and set the large "O" ring of the tensioning gauge at 1/ 64 inch for each inch of belt span.

2. Set the load "O" ring at zero.

3. Place the large end of the gauge at the center of the belt span. Press down until the large "O" ring is even with the top of the belt line or the next belt as in Figure 42, p. 89. Place a straight edge across the sheaves as a reference point. See Figure 41, p. 88.

4. Remove the gauge. Note that the load "O" ring now indicates a number on the plunger scale. This number represents pounds of force required to deflect the belt.

5. Check the reading from step 4 against the values given in . If necessary, readjust belt tension.;

WARNING: Hazardous Voltage w/Capacitors! Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury. Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized.

For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer's literature for allowable waiting periods for discharge of capacitors. Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06 *- EN.

Disconnect all electrical power to the unit.

Wear the appropriate personal protective equipment (PPE).

Use a portable vacuum with HEPA filtration to remove the loose dirt and organic matter. The filter should be 99.97% efficient at 0.3 micron particle size.

Thoroughly clean the fan and associated components with an industrial cleaning solution. Carefully follow the cleaning solution manufacturer's instructions regarding personal protection and ventilation when using their product.

Rinse the affected surfaces thoroughly with fresh water and a fresh sponge to prevent potential corrosion of metal surfaces.

Allow the unit to dry completely before putting it back into service.

WARNING: Hazardous Voltage w/Capacitors! Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized.

For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.

Verify with a CAT III or IV voltmeter rated per NFPA 70E that all capacitors have discharged.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06*-EN.

Evidence of water leakage at the valve stem?

If there is evidence of water leakage at the valve stem, proceed as follows:

Remove actuator motor from support plate.

Torque the packing nut to 10-ft.-lbs. of torque.