Installation and Maintenance Manual

Maintenance
108 UNT-SVX07D-EN
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
l
ine is open following completion of the cleaning
process.
7. Allow the unit to dry thoroughly before putting the
system bac
k into service.
8. Straighten any coil fins that ma
y be damaged with a fin
rake.
9. Replace all panels and parts and restore 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.
Fan Board Assembly Removal
Follow the procedure below when replacing the coil or
making repairs to the fan or motor.
Vertical Units.
1. Remove the front panel of cabinet and recessed units.
2. Pull the main and overflow drain hoses
of the main
drain pan into the inside of the fan-coil chassis end
panel.
3. Remove the two fanboard mounting screws.
4. Slide the fanboard out horizontally to remove.
Horizontal Units.
1. Open the bottom panel of cabinet and recessed
models.
2. Remove the main drain pan following the instructions
gi
ven under the drain pan section above for horizontal
fan-coil units.
3. While supporting the fanboard in place, remove the
two fanboard
mounting screws which secure the
fanboard to the unit.
Replacing Motors
Motors are attached to the fan boards with screws at the
rear of the motors. Fan wheels are attached with Allen
screws on the fan hubs. In most applications, it is
necessary to remove the fan board to change out the
motor. The fan board is easily removable, with screws on
the front left and right edges of fan boards (vertical units)
or on the front left underside and front right underside of
the fan board (horizontal units).
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.
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
NOTICE:
Heavy Object!
Support the fanboard when removing it from the unit.
Failure to properly support fanboard may result in
minor to moderate personal injury.
UNT-SVX07_-EN.book Page 108 Friday, April 27, 2012 9:40 AM