Trane RTHA, Installation, Operation And Maintenance Manual

Page: 28 / 48

RTHC Units with IT (or Wye-Delta) Starter
28 RLC-SVN005B-EN
Additional Components
See “Additional Components,” p. 6 in General
Information chapter for more information.
Pilot Relay
It is recommended to replace the 1K300 and 1K400 relays
when installing the new Benshaw SSS. The new pilot
relays can be mounted in the same place as the original
1K300 and 1K400. See
Table 8, p. 47 for part numbers.
Wiring
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
Starter Damage!
Use of power factor correction or surge capacitors on
the load side of the starter will result in serious damage
to the starter that will NOT be covered by the starter
warranty. The capacitors MUST be connected to the
line side of the starter. The up-to-speed (UTS) contact
can be used to energize the capacitors after the motor
has reached full speed. Do NOT connect the capacitors
between the starter and motor. See RTHC-SVD02*-EN
for further details.
Low Voltage
The next step is the interconnecting wiring between the
existing controls and the new Benshaw Redistart starter.
Figure 27, p. 29 is the basic schematic showing the
necessary wiring for the MX starter. Figure 28, p. 30 is the
schematic for the MX2 starter. Use the same wire size that
was used for the original wiring.
Note: 14 gauge wire is sufficient for most applications.
Adhere to all state and local electrical codes.
High Voltage
Wire the high voltage/power supply from the starter to the
compressor. Remove the existing terminal block and use
the specified Starter Power Lead Kit listed in
Table 7, p. 47 .
Follow the schematic shown in Figure 29, p. 31
Once all of the components are installed and wiring is
complete, skip to
“Quick Start, Initial Parameters,” p. 38 .