Trane RTHA Installation and operating instructions

Solid State Starter Conversion
RTHA, RTHB, RTHC, RTHD
Installation, Operation, and Maintenance
April 2020 RLC-SVN005B-EN
RTHA 50/60 hz units RTHB 50/60 hz units
RTHC 50/60 hz units RTHC 50/60 hz units
This manual covers both Benshaw MX and MX2 solid state starters
MX starter used for units manufactured until November 2010
MX2 starter used in units manufactured December 2010 and later
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are
attached to the equipment.

© 2020 Trane RLC-SVN005B-EN
Introduction
This manual is intended to assist in the conversion of
RTHA, RTHB, RTHC or RTHD starters to a Benshaw solid
state starter configuration.
Read this manual thoroughly before operating or
servicing this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Your personal safety and the proper operation of
this machine depend upon the strict observance of these
precautions.
The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
CAUTIONsIndicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
NOTICE Indicates a situation that could result in
equipment or property-damage only
accidents.
Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment. Trane advocates the responsible handling
of all refrigerants-including industry replacements for
CFCs and HCFCs such as saturated or unsaturated HFCs
and HCFCs.
Important Responsible Refrigerant
Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified according to local rules. For
the USA, the Federal Clean Air Act (Section 608) sets forth
the requirements for handling, reclaiming, recovering and
recycling of certain refrigerants and the equipment that is
used in these service procedures. In addition, some states
or municipalities may have additional requirements that
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
WARNING
Personal Protective Equipment (PPE)
Required!
Failure to wear proper PPE for the job being undertaken
could result in death or serious injury. Technicians, in
order to protect themselves from potential electrical,
mechanical, and chemical hazards, MUST follow
precautions in this manual and on the tags, stickers,
and labels, as well as the instructions below:
• Before installing/servicing this unit, technicians
MUST put on all PPE required for the work being
undertaken (Examples; cut resistant gloves/sleeves,
butyl gloves, safety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Safety Data Sheets
(SDS) and OSHA guidelines for proper PPE.
• When working with or around hazardous chemicals,
ALWAYSrefer totheappropriateSDS andOSHA/GHS
(Global Harmonized System of Classification and
Labeling of Chemicals) guidelines for information on
allowable personal exposure levels, proper
respiratory protection and handling instructions.
• If there is a risk of energized electrical contact, arc, or
flash, technicians MUST put on all PPE in accordance
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.

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:
Compressor Damage!
Disconnect all electric power including remote
disconnects prior to evacuating refrigeration. System
power shall not be applied to the chiller while the
refrigerant system is in a vacuum. Failure to disconnect
power prior to evaluating the refrigerant system, or
application of power while the refrigerant system is in a
vacuum could cause compressor motor damage due to
the nature of the solid state starter.
Introduction
RLC-SVN005B-EN 3
Copyright
This document and the information in it are the property of
Trane, and may not be used or reproduced in whole or in
part without written permission. Trane reserves the right
to revise this publication at any time, and to make changes
to its content without obligation to notify any person of
such revision or change.
Trademarks
Trane and the Trane logo are trademarks or registered
trademarks of Trane in the United States and other
countries. Trane is a business of Ingersoll Rand. All
trademarks referenced in this document are the
trademarks of their respective owners.

4RLC-SVN005B-EN
Table of Contents
General Information . . . . . . . . . . . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Identify Existing Solid State Starter . . . . . . 5
Removal of Existing Starter . . . . . . . . . . . . . 6
Installation of Benshaw Starter . . . . . . . . . . 6
Additional Components . . . . . . . . . . . . . . . . 6
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RTHA Units with Wye-Delta Starters . . . . . . . 8
Removal of Existing Starter . . . . . . . . . . . . . 8
Installation of Benshaw Starter . . . . . . . . . . 9
Additional Components . . . . . . . . . . . . . . . 10
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
RTHB Units with A515 (or Wye-Delta) Starters
14
Removal of Existing Starter . . . . . . . . . . . . 14
Installation of Benshaw Starter . . . . . . . . . 15
Additional Components . . . . . . . . . . . . . . . 16
All Components Installed . . . . . . . . . . . . . . 16
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
RTHC Units with EasySTART (or Wye-Delta)
Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Removal of Existing Starter . . . . . . . . . . . . 20
Installation of Benshaw Starter . . . . . . . . . 21
Additional Components . . . . . . . . . . . . . . . 22
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
RTHC Units with IT (or Wye-Delta) Starter . 26
Removal of Existing Starter . . . . . . . . . . . . 26
Installation of Benshaw Starter . . . . . . . . . 27
Additional Components . . . . . . . . . . . . . . . 28
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
RTHD Units with IT Starter . . . . . . . . . . . . . . . 32
Removal of Existing Starter . . . . . . . . . . . . 32
Installation of Benshaw Starter . . . . . . . . . 33
All Components Installed . . . . . . . . . . . . . . 34
Additional Components . . . . . . . . . . . . . . . 34
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Quick Start, Initial Parameters . . . . . . . . . . . 38
Prior to Unit Power Up . . . . . . . . . . . . . . . . 38
Remote Keypad . . . . . . . . . . . . . . . . . . . . . . . . .41
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . .42
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . .43
Selecting New Starter . . . . . . . . . . . . . . . . . .43
Mounting Dimensions . . . . . . . . . . . . . . . . .44
Starter Power Leads . . . . . . . . . . . . . . . . . . .47
Circuit Breaker with Shunt Trip . . . . . . . . . .47
Additional Components . . . . . . . . . . . . . . . .47
Service Components . . . . . . . . . . . . . . . . . . .47
Production Change . . . . . . . . . . . . . . . . . . . .47
Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

RLC-SVN005B-EN 5
General Information
General
NOTICE
Compressor Motor Damage!
Disconnect all electric power including remote
disconnects prior to evacuating refrigerant.
System power shall not be applied to the chiller
while the refrigerant system is in a vacuum.
Failure to disconnect power prior to evacuating
the refrigerant system, or application of power
while the refrigerant system is in a vacuum, will
cause compressor motor damage due to the
nature of the solid state starter.
Important: Do NOT energize the unit if the refrigerant
side of the system is in a vacuum.
The Benshaw Solid State Starter is an “in-the-delta”
starter. The starter leads and motor leads are always
energized. Catastrophic damage to the compressor motor
will occur if supply power is applied while the system is in
a vacuum.
Identify Existing Solid State
Starter
Trane has used three styles of solid state starters over the
past several years. Determine whether the SSS is an A515,
EasySTART or Intelligent Technology (IT) by comparing
the unit to the photographs below.
Figure 1. A515 Solid State Starter
Figure 2. Cutler-Hammer Intelligent Technology (IT)
Starter
Figure 3. Cutler-Hammer EasySTART

General Information
6RLC-SVN005B-EN
Once the type of starter is determined, proceed to the
section in the bulletin that corresponds with the correct
unit and start type.
Important: Always follow safe electrical practices while
installing the new starter. Be certain to route
new wiring neatly through the starter panel.
Do not allow the wiring to come in contact
with any sharp objects. It is advised to place
fish paper between the bottom of the starter
cabinet and wiring.
Important:
UL REQUIREMENT
• The field conversion of the starter will void the
factory UL listing.
• The customer must obtain a UL inspection if a UL
listing is required.
Removal of Existing Starter
See unit chapters for specific information on existing
starter removal.
Installation of Benshaw Starter
See unit chapters for graphics which show unit specific
installation information and location of required
components for the Benshaw RediStart SSS conversion.
Notes:
•All Benshaw Solid State Starters supplied after
November 2010 are MX2 starters.
•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.
•See unit specific chapters for the proper installation
location of the Benshaw current transformers.
•Benshaw CTs are polarity sensitive. For specific details
on mounting of the Benshaw Solid State Starter, see
“Benshaw Solid State Starter Hardware Manual, pages
20-32. The manual ships with the Benshaw starter.
•Secure locally any required low voltage wire, bolts,
nuts and other hardware as required.
Additional Components
Pilot Relay
See unit chapters for specific information on pilot relays.
See Table 8, p. 47 for part numbers.
Cabinet Fan (optional)
A locally obtained cabinet fan needs to be installed in the
cabinet to avoid overheating. The fan can be mounted
internal or external to the cabinet. See Table 8, p. 47 for
part numbers.
Note: The fan can be mounted over the existing vents on
the cabinet. It is not necessary to cut a hole on the
cabinet.
Circuit Breaker and Shunt Trip
Important: All units that are converted to the Benshaw
RediStart Solid Start Starter REQUIRE a
circuit breaker and shunt trip device.
• If the unit was built with a circuit breaker, contact Trane
Service Parts for shunt option or source locally.
• If unit was NOT built with a circuit breaker, one must be
added, as well as the shunt breaker as listed above.
Contact Trane Service Parts for circuit breaker
information.
Refer to local and state electrical codes for proper sizing of
the shunt trip device.
Benshaw Remote Display Panel
The remote display panel is recommended if voltage and
current monitoring is necessary. See “Remote Keypad,”
p. 41 for further details.
Warning Label
Two warning labels, part number LBL00419 and shown in
Figure 4, are required for each unit. Install one each by
motor terminals AND on outside of panel.
Note: LBL00419 is a single label. You must order quantity
two (2) for each unit.
Figure 4. Warning label
X39003766010A
HAZARD OF ELECTRIC SHOCK
Motor leads are live when the motor is not running.
Disconnect the power source before servicing the motor.
Failure to disconnect power to the motor before servicing could result in
serious injury or death.
WARNING
DANGER DE CHOC ÉLECTRIQUE
Les fils du moteur sont sous tension même lorsque le moteur ne fonctionne
pas.
Débranchez la source d’alimentation avant tout entretien du moteur.
Un manquement à débrancher l’alimentation du moteur avant l’entretien
pourrait causer des blessures graves ou la mort.
PELIGRO DE CHOQUE ELÉCTRICO
AVERTISSEMENT
ADVERTENCIA
Los cables del motor tienen corriente cuando el motor no está
funcionando.
Desconecte la alimentación antes de dar servicio al motor.
Si no se desconecta la alimentación antes de dar servicio al motor, pueden
producirse lesiones graves o la muerte.

General Information
RLC-SVN005B-EN 7
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.
Each unit specific chapter includes a basic schematic
showing the necessary wiring for the controls. 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. Use the specified Starter Power Lead Kit
listed in Table 7, p. 47. Follow the schematic in unit
specific chapters.

8RLC-SVN005B-EN
RTHA Units with Wye-Delta Starters
Removal of Existing Starter
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
The following components of an Wye -Delta starter need
to be removed prior to installing the RediStart starter:
• 2R1-2R6 Resistors
• 2K1-2K4 Contactors
• 2U1 monitor
• Optional voltage/current meters
Figure 5, p. 8 shows the basic layout of the Wye-Delta
starter with the components that need to be removed
highlighted.
Note: If the optional voltage/current meters are mounted
on the cabinet door, they must be removed for the
new starter to fit properly. Once the meters are
removed, block-off plates can be obtained locally.
Install per your state and local codes.
Figure 5. Remove the highlighted components (wye-delta starter) — RTHA-YD
2K1
2K2
2K3
2K4
2T4
2R1-2R6
T1
T2
T3
T4
T5
T6
2TB1
or
2CB1
2F1 2F2 2TB2
2TB3
2K5
2T5
2T6
2T7
2T1
2T2
2T3
2U1

Figure 6. Photograph of wye-delta starter
RTHA Units with Wye-Delta Starters
RLC-SVN005B-EN 9
Installation of Benshaw Starter
Once all of the wye-delta starter components in Figure 5,
p. 8 are removed, refer to Figure 7, p. 9 for the
approximate locations of the new Redistart components.
Note: 2K300 and 2K400 can be placed in either location
noted below.
Figure 7. Location of Benshaw starter and additional components (highlighted) — RTHA
2T4
T1
T2
T3
T4
T5
T6
2F1 2F2 2TB2
2TB3
2K5
2T5
2T6
2T7
2T1
2T2
2T3
Benshaw
Redistart
Solid State
Starter
Fan
CT1
CT2
CT3
Shunt
Trip
(Breaker)
2K300
2K400
2K300
2K400
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: Benshaw CTs are polarity sensitive. For specific
details on mounting of the Benshaw Solid State
Starter, see “Benshaw Solid State Starter Hardware
Manual, pages 20-32. The manual ships with the
Benshaw starter.

RTHA Units with Wye-Delta Starters
10 RLC-SVN005B-EN
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.
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 8, p. 11 is the basic schematic showing the
necessary wiring for the MX starter. Figure 9, p. 12 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. Use the Starter Power Lead kits called out in
Table 7, p. 47. Follow the schematic shown in Figure 10,
p. 13.
Once the components are mounted and wired, skip to
“Quick Start, Initial Parameters,” p. 38 to set up the
controls for proper operation.

Figure 8. Control power wiring (new wiring bold/highlighted in red) — RTHA (MX starter)
4O3HUNT4RIP
FAN
to shunt
trip coil
1K400
1K400
1K400
.
(
4"
,
$+
"ENSHAW
333
4"
5#
4"
4"
4"
4"
4" 4"
+
4"
4"
4"
4"
5
"0!58"ENSHAW3TARTER
+
4"
4OSTARTAND
HOURMETERS
RTHA Units with Wye-Delta Starters
RLC-SVN005B-EN 11

Figure 9. Control power wiring (new wiring bold/highlighted in red) — RTHA (MX2 starter)
To Shunt Trip
FAN
2K400
2K400
2K400
(N)
(H)
2TB2-7
1U2C
1TB2-8
2TB2-5 2TB2-6
1TB5-4
1TB2-9
1TB2-7
2K300
1TB3-16
1TB3-17
1TB4-5
1TB4-6
1U3 2K300
1TB5-101TB5-10
OT SWITCH
BP1
AUX
201
202
206
203
205
204
To motor
oil valve
To start and
hour meters
1TB5-9
To shunt
trip breaker
2U1-B
RTHA Units with Wye-Delta Starters
12 RLC-SVN005B-EN

Figure 10. Power wire (new wiring bold/highlighted in red) — RTHA
RTHA Units with Wye-Delta Starters
RLC-SVN005B-EN 13

14 RLC-SVN005B-EN
RTHB Units with A515 (or Wye-Delta) Starters
Removal of Existing Starter
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.
The following components of an A515 Cutler Hammer SSS
need to be removed prior to installing the RediStart
starter:
•Powerpoles
• CFR mounted on 2TB3
•2TRTimer
• MOV behind the 2U1 module
• 2CR1 control relay
For units with wye-delta starters, remove the associated
contactors and resistors. See “RTHA Units with Wye-Delta
Starters,” p. 8 for an example.
Figure 11, p. 14 shows the basic layout of the A515 starter
with the components that need to be removed
highlighted.
Figure 11. Remove the highlighted components (A515 starter) — RTHB
4 5
#"OR3
&
&
&
00
00 00
&!. &!. &!.
5
4
4
4
4
-/6
4
& & &
4
4
4
4
&!.
4
4
4
4
4
4
42
#2

Figure 12. Photograph of A515 solid state starter
RTHB Units with A515 (or Wye-Delta) Starters
RLC-SVN005B-EN 15
Installation of Benshaw Starter
Once all of the A515 components in Figure , p. 15 are
removed, the 2T4 transformer needs to be moved to make
room for the new Benshaw starter. See Figure 13, p. 15 for
the approximate locations of the new Redistart
components.
Figure 13. Location of Benshaw starter and additional components (highlighted) — RTHB
Shunt Trip
(Breaker)

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: Benshaw 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 existing temperature 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 starter installed — 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 schematic 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
controls for proper operation.

Figure 15. Control power wiring (new wiring bold/highlighted in red) — RTHB (MX Starter)
To Shunt Trip
FAN
to shunt
trip coil
2K400
2K400
2K400
8&3
(N)

(H)
2K300
TB1
L
DK2
1
2
3
HPC
Benshaw
SSS
120/240 VAC (input)
TB
TB
2K300
2TR1
RTHB Units with A515 (or Wye-Delta) Starters
RLC-SVN005B-EN 17

Figure 16. Control power wiring (new wiring bold/highlighted in red) — RTHB (MX2 Starter)
OT SWITCH
BP1
AUX
201
202
206
203
205
204
FAN (optional)
2K11/
2K400

(N)
(H)
2K3002K300
To T1To T1
To T2To T2
To T3To T3
HPC
2K300
120/240 VAC (input)
2K11/
2K400
2K11/
2K400
TO SHUNT
TRIP COIL
(Breaker)
TO SHUNT
TRIP
(Breaker)
2TR1
Optional contact.
See note 1.
NOTE:
1. Connection to start signal is required. If you don’t use this contact, you need to place a wire to the start signal.
RTHB Units with A515 (or Wye-Delta) Starters
18 RLC-SVN005B-EN

Figure 17. Power wiring (new wiring bold/highlighted in red) — RTHB
To TB3 - CT1
on Benshaw SSS module
To TB3 - CT3
on Benshaw SSS module
To TB3 - CT2
on Benshaw SSS module
2CT2
2CT3
2T1
2T2
2T3
To UCP2, J16-1
To TB nuetral
COMP
Benshaw Starter
UCP2 CT’s
2CT1
Benshaw
SSS CT’s
To J5-1 on UCP2
To J5-2 on UCP2
To J5-3 on UCP2
To J5-4 on UCP2
To J5-5 on UCP2
To J5-6 on UCP2
RTHB Units with A515 (or Wye-Delta) Starters
RLC-SVN005B-EN 19

20 RLC-SVN005B-EN
RTHC Units with EasySTART (or Wye-Delta) Starter
Removal of Existing Starter
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.
For units with an Easy Start Cutler Hammer SSS, remove
the following components, location shown in Figure 18:
• 1U11, EasySTART SSS
• 1K300 (replace)
• 1K400 (replace)
• 1TB1 terminal block
For units with wye-delta starters, remove the associated
contactors and resistors. See “RTHA Units with Wye-Delta
Starters,” p. 8 for an example.
Figure 18. Remove highlighted components (EasySTART) — RTHC
%ASY3TART
3OLID3TATE3TARTER
4ERMINAL"LOCK