Installation and Maintenance Manual

Maintenance
110 UNT-SVX07D-EN
Note: Motor plug with latch.
Horizontal Units
Notes:
• In horizontal units, wiring to the motor is routed below
the fan board but is wire-tied to the fan board for
harness management and to avoid sharp edges.
• The motor harnesses terminate at the motor location
with a latching multi-plug.
• The crossover harnesses, which are used to make
connections to the piping side of the unit, are routed
initially below the fan board, but transition into a
trough on the top side of the fan board, and into the
piping section of the unit.
• Fan board attachment screws are located on the front
left underside and front right underside of the fan
board.
Work Instruction Steps
In general, replacement of a motor needs to be carried out
as follows:
1. Remove front panels of unit.
2. Remove drain pan and drain pan support (vertical
units) or remove drain pan (horizontal units).
3. Free the motor and crossover harnesses from the fan
bo
ard, either by unplugging from the motors and
valves and threading backwards, or by unplugging the
motor plug from the adapter boards.
4. Remove the fan board attachment screws and carefully
lower/slide out fan board.
5. Remove at least one fan housing and loosen fan Allen
screw
on first fan. Loosen the wheel of the other (if a
double-shafted motor).
6. Unscrew the motor and remove.
7. Insert the replacement motor (plug must face front of
fan b
oard) and drive the screws in with 100 in·lb of
torque.
Control Device Replacement
To order control components such as relays, contactors,
transformers, low temperature detection devices,
condensate overflow detection devices, differential
pressure switches, sensors, control valves and actuators,
contact the local Trane Service Parts Center. To order, the
Trane parts center will need the unit model number (which
can be found on the unit nameplate), the serial number,
and the part name or ID.
Periodic Maintenance Checklists
Monthly Checklist
The following check list provides the recommended
maintenance schedule to keep the unit running efficiently.
Figure 41. Motor attachment screws (located behind
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.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
UNT-SVX07_-EN.book Page 110 Friday, April 27, 2012 9:40 AM