Unit installation

Maintenance
SCXF-SVX01K-EN 91
4. Flush tubes with water to push the sludge out through
the drain opening in the bottom of the supply header
and the return pipe.
5. To clean the economizer tubes, remove the cast iron
header
plates at both sides of the coil between the inlet
and outlet headers (four-row coils only; two-row coils
do not have cover plates at right end). Rotate round
brush through tubes from left end to loosen
contaminants. Flush tubes with water.
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:
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
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.
Maintenance Periodic Checklists
Monthly Checklist
The following check list provides the recommended
maintenance schedule to keep the commercial self-
contained equipment running efficiently.
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
economiz
er 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: Chec
k 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
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. 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.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this manual could result in exposure
to electrical, mechanical or other potential safety
hazards. Always refer to the safety warnings provided
throughout this manual concerning these procedures.
Unless specified otherwise, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.