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SCXG-SVX01B-EN 103
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).
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
Water Valves
Water valves have a stern packing nut. If
there is evidence of water leakage at the
valve stem, proceed as follows:
ƽƽ
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ƽWARNING
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 by Trane 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.