RTHB Units with A515 (or Wye-Delta) Starters
16 RLC-SVN005B-EN
The Benshaw Redistart SSS is supplied with current
transformers. The current transformers wired to the chiller
need to remain installed as shipped from the factory. The
current transformers supplied with the solid state starter
need to be installed as close to the original current
transformers as possible for proper operation.
Note: Bens
haw CTs are polarity sensitive. For specific
details on mounting of the Benshaw Solid State
Starter, see the “Benshaw Solid State Starter
Hardware Manual” pages 20-32. The manual ships
with the Benshaw starters.
Additional Components
See “Additional Components,” p. 6 in General
Information chapter for more information.
Pilot Relays
Two additional relays need to be installed for proper
operation. The relays are labeled as 2K400 and 2K300 on
the included wiring schematic. See Table 8, p. 47 for part
numbers.
Resistor
To avoid an informational warning of “Heat Sink Temp
Sensor” that the new solid state starter no longer utilizes,
place a 9.1-10kohm resistor on J7- 1 and J7-2.
Note: The e
xisting temp
erature sensor (2TR1) attached to
the A515 pole can be dis-mounted from the power
pole and left in the cabinet to act as a resistor
between terminals J7-1 and J7-2.
All Components Installed
To help visualize how the wires can be routed between the
existing starter module, compressor and the new
Benshaw Redistart starter see photograph in Figure 14,
p. 16.
Figure 14. Benshaw sta
rter inst
alled — RTHB
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 15, p. 17 is the basic schematic showing the
necessary wiring for the MX starter. Figure 16, p. 18 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. Notice that the original bus bars need to be
cut in the field. Mount the new wiring directly to the bus
bar according to local and state electrical codes. Use the
Starter Power Lead kits called out in Table 7, p. 47. Follow
the sc
hematic shown in Figure 17, p. 19.
Once
the components are mounted and wired, skip to
“Quick Start, Initial Parameters,” p. 38 to set up the
con
trols for prop
er operation.
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