104 UNT-SVX07B-EN
Maintenance
Inspecting and Cleaning Coils
Coils become externally fouled as a result of normal operation. Dirt on the coil surface reduces it’s
ability to transfer heat that can result in comfort problems, increased airflow resistance and thus
increased operating energy costs. If the coil surface dirt becomes wet, which commonly occurs
with cooling coils, microbial growth (mold) may result, causing unpleasant odors and serious
health-related indoor air quality problems.
Inspect coils at least every six months or more frequently as dictated by operating experience.
Cleaning frequently is dependent upon system operating hours, filter maintenance, and efficiency
and dirt load. Follow the suggested methods in the following paragraphs.
Steam and Hydronic Coil Cleaning Procedure
1. Disconnect all electrical power to the unit.
2. Don the appropriate personal protective equipment (PPE).
3. Access both sides of the coil.
4. Use a soft brush to remove loose debris from both sides of the coil.
5. Use a steam cleaning machine, star
ting from the top of the coil and working downward. Clean
the leaving air side of the coil first, then the entering air side. Use a block-off to prevent steam
from blowing through the coil and into a dry section of the unit.
6. Repeat step five as necessary. Confirm that the
drain line is open following completion of the
cleaning process.
7. Allow the unit to dry thoroughly before
putting the system back into service.
8. Straighten any coil fins
that may be damaged with a fin rake.
9. Replace all panels and parts and restor
e electrical power to the unit.
Winterizing the Coil
Make provisions to drain coils that are not in use, especially when subjected to freezing
temperatures.
To drain the coil, blow the coil out with compressed air. Next, fill and drain the tubes with full-
strength ethylene glycol several times. Drain the coil as completely as possible.
NOTICE
Coil Freeze-up Damage!
Failure to properly drain and vent coils when not in use during freezing temperatures may result
in coil freeze-up damage.
Fan Board Assembly Removal
Follow the procedure below when replacing the coil or making repairs to the fan or motor.
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.
Vertical Units.
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