Trane SCXG-SVX01B-EN manual Piping Components, Chemical Cleaning of Condenser and Economizer Coil

maintenance

Maintenance procedures

6.Replace condenser end plates and clamps.The end plates must be centered when tightening the clamp.

7.Replace coil headers with gaskets and torque bolts to 50 ft.-lb.

8.Replace drain and vent plugs.

Chemical Cleaning of Condenser and Economizer Coil

Chemical cleaning removes scale deposits built up by minerals in the water. For a suitable chemical solution, consult a water treatment specialist. The condenser water circuit is composed of copper, steel, and cast iron.

The chemical supply house should approve or provide all materials used in the external circulating system, along with the quantity of cleaning material, duration of cleaning time, and safety precautions necessary for handling the cleaning agent.

Piping Components

WaterValves

Water valves have a stern packing nut. If there is evidence of water leakage at the valve stem, proceed as follows:

￿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.Remove actuator motor from support plate.

2.Remove shaft coupling.

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

4.Replace shaft coupling.

5.Replace actuator motor.

Flow Switch Maintenance

Flow switches have a magnet on the vane assembly that attracts ferrous particulate may build up on the magnet to the point that the vane will wedge and not operate properly.

When the flow switch does not operate, remove and replace it or disassemble and clean it.

Cleaning the Flow Switch

If ferrous particulate contaminates tower water, the ferrous particles may cling to the magnet on the switch paddle assembly. Build up of the ferrous particles may cause the paddle to stick and not function properly.

To avoid this problem, remove the switch and clean each time you clean the condensers, or clean as needed to keep the switch operational.

To clean the paddle assembly, remove it following the procedure below:

1.Remove the switch from the unit.

2.The paddle assembly and wire retainer clip holds the paddle assembly in the switch body.

3.Remove the wire retainer clip by reaching down past the paddle with a pair of slim nosed pliers and gripping the end of the wire. Pull up on the wire, clip, and remove it.

4.After removing the wire clip, use the pliers to pull the paddle assembly out of the switch barrel. Clamp the pliers onto the end of the paddle and remove the paddle assembly. It will slide straight out.

5.Clean the ferrous particulate from the magnet using a rag or tack cloth.The particulate is attracted to the magnet, so it is necessary to pull it off. It will not easily wipe off.

6.After cleaning the magnet, replace the paddle assembly into the switch body’s barrel. However, it is important to position the paddle perpendicular to the arrow on the switch’s side and place the paddle’s flat side facing the opposite

direction or the arrow. Push the paddle assembly in until it hits the barrel cavity bottom.

7.Place the spring clip into the switch barrel and push it down with a small, flat blade screwdriver until the spring clip engages the groove in the switch barrel.

8.When replacing the paddle assembly, check the operation by pushing on the paddle’s flat side.The paddle should swing freely in the direction of the arrow.This action confirms that the paddle assembly is properly installed.

9.Replace the switch into the unit piping using a good pipe thread sealer.Tighten the switch so that its final position has the arrow parallel to the water pipe and pointing toward the left end of the unit (arrow is pointing in the direction of the water flow).

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