Trane Stealth™ Air-Cooled Chiller SCWF35

Measure belt span between centers of sheaves

Set the large 'O' ring of the tensioning gauge at 1/64 inch for each inch of belt span

Is 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

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.

Check the reading from step 6 against the values given in the manual. If necessary, readjust belt tension.

Sign off on the belt tension maintenance

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.

The VFD access panel is hinged to allow service access to the fan motor and belt drive components that are located behind it.

Remove the unit center cover panel to the left of the VFD panel.

Remove and discard the sheet metal shipping screws along the top and bottom edges of the VFD panel.

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.

Perform the following procedures according to the "Maintenance Periodic Check List":

1. Rotate the fan wheel to ensure it turns freely in the proper direction and is not rubbing on the fan housing or inlet. If necessary, center the fan wheel again.

2. Check the position of both shafts. Fan and motor shafts should operate parallel to each other for maximum belt and bearing life. Shim as necessary under the motor or fan bearings to obtain proper alignment.

NOTICE: 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.

Disconnect all electrical power to the unit.

Wear appropriate personal protective equipment (PPE).

Access both sides of the coil section.

Use a soft brush to remove loose debris from both sides of the coil.

Use a steam cleaning machine, starting from the top of the coil and working downward. Clean the leaving air side of the coil first, then the entering air side. Use a block-off to prevent steam from blowing through the coil and into a dry section of the unit.

Repeat step 5 as necessary. Confirm that the drain line is open following completion of the cleaning process.

Verify the fan motor is properly lubricated

Follow lubrication recommendations on the motor tag or nameplate. Contact the motor manufacturer for more information.

For best results, lubricate bearings during unit operation. Refer to the “Fan Bearings” section for recommended grease.

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.

List any obstructions and debris found

Center the fan wheel if necessary

Check the fan assembly sheave alignment