Trane Stealth™ Air-Cooled Chiller SCWF20

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.

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.

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

Rotate the fan wheel to ensure it turns freely in the proper direction and is not rubbing on the fan housing or inlet.

Check the position of both shafts. Fan and motor shafts should operate parallel to each other for maximum belt and bearing life.

Check the fan motor sheave alignment with straight edge or a tightly pulled string.

Once the sheaves are properly aligned, tighten sheave set screws to proper torque.

Check belt tension. Refer to the 'Measuring Belt Tension' section.

If required, adjust belt to the minimum recommended tension. Refer to 'Adjusting Belt Tension' section.

Re-tighten bearing set screws to the proper torques after aligning the sheaves.

Check and tighten all set screws, bolts, locking collars and sheaves.

1. Inspect, clean, and tighten all electrical connections.

2. Visually inspect the entire unit casing for chips or corrosion. Remove rust or corrosion and repaint surfaces.

3. Visually check for leaks in refrigerant piping.

4. Inspect fan, motor, and control contacts. Replace badly worn or eroded contacts.

5. Inspect the thermal expansion valve sensing bulbs for cleanliness, good contact with the suction line, and adequate insulation from ambient air.

6. Verify the superheat setting is 12 -17°F at the compressor.

When checking operating pressures and conditions, establish the following nominal conditions for consistent measurements.

• Leaving air temperature greater than 60°F

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.