Trane Stealth™ Air-Cooled Chiller SCWF29

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

Inspect, clean, and tighten all electrical connections

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

Visually check for leaks in refrigerant piping

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

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

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

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.

Check the condensate drain pan and drain line to ensure that the condensate drains properly

If evidence of standing water or condensate overflow exists, take steps to identify and remedy the cause immediately. Refer to the troubleshooting section of this manual for possible causes and solutions.

Disconnect all electrical power to the unit.

Don the appropriate personal protective equipment (PPE).

Use a scraper or other tools to remove and solid matter. Remove solid matter with a vacuum device that utilizes high efficiency particulate arrestance (HEPA) filters with a minimum efficiency of 99.97% at 0.3 micron particle size.

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 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

Is a straight edge placed across the sheaves as a reference point?

Note the number on the plunger scale after removing the gauge

Check the reading from step 7 against the values given

Is readjustment of belt tension necessary?

NOTICE: Do not over-tension belts as it could reduce fan and motor bearing life, accelerate belt wear and possibly cause shaft failure.

To adjust belt tension see Figure 42, p. 89 and perform the following procedure:

Loosen bolts A, B, and E on both sides of the sliding motor base. See Figure 43, p. 90.

Loosen nuts C and D (as required for motor horsepower) to slide the motor on its mounting plate in the proper direction to tension or relieve tension on the belt.

Adjust nuts A-D and bolt E. Do not stretch the belts over the sheaves.

Verify tension is adjusted properly.

Recommended belt tension range values are on the unit fan scroll. To access the fan scroll, face the righthand side of the unit and remove the top left panel. The belt tension label is on the top right-hand corner of the fan scroll. See Figure 43, p. 90

The correct operation tension for a V-belt drive is the lowest tension at which the belt will not slip under the peak load conditions. It may be necessary to increase the tension of some drives to reduce flopping or excessive startup squealing.