Trane SCXG-SVX01B-EN manual Maintenance Periodic Checklists, maintenance, Maintenance procedures

maintenance

Maintenance procedures

Maintenance Periodic

Checklists

Monthly Checklist

The following check list provides the recommended maintenance schedule to keep the commercial self-contained equipment running efficiently.

￿WARNING

Hazardous Voltage w/Capaci- tors!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout proce- dures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided byTrane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

Note: For additional information regard- ing the safe discharge of capacitors, see PROD-SVB06A-EN or PROD-SVB06A-FR.

1.Inspect unit air filters. Clean or replace if airflow is blocked or if filters are dirty.

2.Inspect coils for excess moisture or icing. Icing on the coils may indicate low airflow supply, restricted airflow from dirty fins, evaporator frost protection sensor problems, or a shortage of refrigerant flowing through the coil.

3.Check that condensate from the evaporator and economizer coils flows freely through the condensate piping, traps, drain pan, and drainage holes.

Remove algae and or any airflow obstructions.

4.Check the condition and tension of fan belts. Adjust tension if belts are floppy or squeal continually. Replace worn or fraying belts in matched sets.

Note: Check belt tension and adjust it at least twice daily the first days of new belt operation. Belt tension will rapidly decrease until the belts are run in.

5.Check the liquid line sight glasses during operation. Bubbles in the sight glasses indicate a possible shortage of refrigerant or an obstruction in the liquid lines, e.g. dirty liquid line filter driers.

6.Inspect filter driers for leaks, flow obstructions, or temperature drop across the filter drier. A noticeable temperature differential, e.g. 5°F, in the liquid line may indicate an obstruction. Replace the filter drier if it appears clogged.

7.Inspect the optional waterside economizer coil. Clean the coil to prevent airflow restrictions through the fins.

8.Check and record operating pressures.

Semi-Annual Maintenance

1.Verify the fan motor is properly lubricated. Follow lubrication recommendations on the motor tag or nameplate. Contact the motor manufacturer for more information.

2.Lubricate fan bearings. For best results, lubricate bearings during unit operation. Refer to the “Fan Bearings” section on page 84.

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

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

5.Check water valves for leakage at valve stem packing nut.

6.Inspect the inlet vane assembly and perform maintenance procedures in the IGV maintenance section.

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

Annual Maintenance

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 mea- surements.

1.Leaving air temperature greater than 60°F

2.Entering air temperature is 80 - 90°F

3.Entering water temperature greater than 65°F

4.Inlet guide vanes at least halfway open

5.Compressors running at full load

6.Drain the condensing water system and inspect it thoroughly for fouling, clean condensers if necessary.

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