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AC-SVX003A-EN
• The low voltage connections are made through
knockouts provided on the left side of the control panel.
Additional grounds may be required for each 115 volt
power supply to the unit. Green lugs are provided for
115V customer wiring.
For units larger than 330 tons:
• For dual point power units, the high voltage field-
provided connections are made through patch plate on
the right side of each control panel. Dimensions of
incoming power location on each control panel are as
shown in Figure 21, p. 64.
• For single point power units, the high voltage field
provided connections are made through the right side
or rear of the additional enclosure as noted on the
enclosure label. See Figure 22, p. 65.
• The low voltage connections are made through
knockouts provided on the left side of the circuit one /
main control panel.
• Additional grounds may be required for each 115 volt
power supply to the unit. Green terminals are provided
for 115V customer wiring.
Adaptive Frequency Drive Capacitor
Discharge
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.
After disconnecting input power, wait twenty minutes for the
DC capacitors to discharge before opening the electrical
panel. Once the electrical panel is opened, use a non-
contact voltage detecting wand to check for any voltage on
the input or output terminals of the drive.
Control Power Supply
The unit is equipped with a control power transformer. It is
not necessary to provide additional control power voltage
to the unit. No other loads should be connected to the
control power transformer.
All units are factory-connected for appropriate labeled
voltages.
Service Power Connection
The service power connection is a touch-safe procedure for
binding the control system and LLIDs. With service power
connection, a NEMA 5-15 style extension cord can be used
to power Class 2 devices, such as Symbio™ 800, LLIDs,
EXVs, and TD7 display, with an external power source, and
without line voltage applied to the unit. For the main
enclosure (all unit sizes), connect to 1XJ5. For 375 to 550
ton units, an additional connection is required at 2XJ5.
Upstream current protection is required for the extension
cord power source. Service power connection required
voltage is 115V at 60Hz.
Heater Power Supply
The evaporator shell, indirect free cooling water containing
components and factory installed pump packages are
insulated and protected from ambient temperatures down
to -20°F (-29°C) by thermostatically-controlled immersion
heaters. If the freeze protection method of “Water pump
control AND heaters” is chosen for a non-free cooling unit,
see “Freeze Protection,” p. 58, the installing contractor
needs to supply 115V 60Hz single phase circuit to
terminals 1X8-1, 2, and 5. These terminals are located
behind the low voltage control panel on the inside wall of
the main enclosure. See Figure 23, p. 67.
For units with model number digit 29 = 3, this electrical
connection is already made by the factory wiring. See
Table 23, p. 67 for heater summary.
For evaporators, whenever the water temperature drops to
approximately 37°F (2.8°C), the thermostat energizes the
heaters.
For the indirect free cooling water containing components
and factory installed pump packages, whenever the water
temperature drops to approximately 37°F (2.8°C) and there
is not a pump command present the thermostat energizes
the heaters.
Installation Electrical
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