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Chemical Cleaning 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
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.
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. The 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.
PKG-SVX027A-EN
Maintenance Periodic Checklists
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on the
tags, stickers, and labels could result in death or serious
injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the tags,
stickers, and labels, as well as the following instructions:
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.
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
economizer coils flows freely through the condensate
piping, traps, drain pan, and drainage holes. Remove
algae and or any airflow obstructions.
4. 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.
5. 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.
6. Inspect the optional waterside economizer coil. Clean
the coil to prevent airflow restrictions through the fins.
7. Check and record operating pressures.
Maintenance
69
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