Trane RTHA Installation, Operation And Maintenance Manual
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Trane RTHA Installation, Operation And Maintenance Manual

Solid state starter conversion
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Installation, Operation, and Maintenance
Solid State Starter Conversion
RTHA, RTHB, RTHC, RTHD
RTHA 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
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.
April 2020
RTHB 50/60 hz units
RTHC 50/60 hz units
SAFETY WARNING
RLC-SVN005B-EN

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  • Page 1 Installation, Operation, and Maintenance Solid State Starter Conversion RTHA, RTHB, RTHC, RTHD 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...
  • Page 2 Introduction This manual is intended to assist in the conversion of RTHA, RTHB, RTHC or RTHD starters to a Benshaw solid WARNING state starter configuration. Proper Field Wiring and Grounding Read this manual thoroughly before operating or Required! servicing this unit.
  • Page 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.

  • Page 4: Table Of Contents

    ....... 7 Circuit Breaker with Shunt Trip ..47 RTHA Units with Wye-Delta Starters ..8 Additional Components .

  • Page 5: General Information

    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, Figure 3. Cutler-Hammer EasySTART EasySTART or Intelligent Technology (IT) by comparing the unit to the photographs below.

  • Page 6: Removal Of Existing Starter

    UL listing. • If the unit was built with a circuit breaker, contact Trane Service Parts for shunt option or source locally. • The customer must obtain a UL inspection if a UL listing is required.

  • Page 7: Wiring

    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.

  • Page 8: Rtha Units With Wye-Delta Starters

    The following components of an Wye -Delta starter need Install per your state and local codes. to be removed prior to installing the RediStart starter: • 2R1-2R6 Resistors Figure 5. Remove the highlighted components (wye-delta starter) — RTHA-YD 2TB2 2TB3 2R1-2R6 2TB1 2CB1...

  • Page 9: Installation Of Benshaw Starter

    8 are removed, refer to Figure 7, p. 9 for the noted below. approximate locations of the new Redistart components. Figure 7. Location of Benshaw starter and additional components (highlighted) — RTHA 2TB2 2K300 2K400 2TB3 2K300 Benshaw Shunt...

  • Page 10: Additional Components

    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.
  • Page 11 RTHA Units with Wye-Delta Starters Figure 8. Control power wiring (new wiring bold/highlighted in red) — RTHA (MX starter) 1K400 1K400 1K400 to shunt trip coil RLC-SVN005B-EN...
  • Page 12 RTHA Units with Wye-Delta Starters Figure 9. Control power wiring (new wiring bold/highlighted in red) — RTHA (MX2 starter) To Shunt Trip 2K400 2TB2-5 2TB2-6 2K400 2U1-B To motor 1TB5-9 oil valve To start and 1TB5-10 1TB5-10 hour meters OT SWITCH...
  • Page 13 RTHA Units with Wye-Delta Starters Figure 10. Power wire (new wiring bold/highlighted in red) — RTHA RLC-SVN005B-EN...

  • Page 14: Rthb Units With A515 (Or Wye-Delta) Starters

    For variable frequency drives • 2CR1 control relay or other energy storing components provided by Trane For units with wye-delta starters, remove the associated or others, refer to the appropriate manufacturer’s contactors and resistors. See “RTHA Units with Wye-Delta...

  • Page 15: Installation Of Benshaw Starter

    RTHB Units with A515 (or Wye-Delta) Starters Figure 12. Photograph of A515 solid state starter Installation of Benshaw Starter Once all of the A515 components in Figure , p. 15 the approximate locations of the new Redistart removed, the 2T4 transformer needs to be moved to make components.

  • Page 16: Additional Components

    For variable frequency drives or other energy with the Benshaw starters. storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable Additional Components waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have “Additional Components,”...
  • Page 17 RTHB Units with A515 (or Wye-Delta) Starters Figure 15. Control power wiring (new wiring bold/highlighted in red) — RTHB (MX Starter) To Shunt Trip 2K400 120/240 VAC (input) Benshaw 2K400 2K400 2TR1 2K300 2K300 to shunt trip coil RLC-SVN005B-EN...
  • Page 18 RTHB Units with A515 (or Wye-Delta) Starters Figure 16. Control power wiring (new wiring bold/highlighted in red) — RTHB (MX2 Starter)  TO SHUNT TRIP (Breaker) 2K11/ 2K400 120/240 VAC (input) 2K11/ 2K11/ OT SWITCH 2K400 2K400 Optional contact. See note 1. To T1 To T1 To T2...
  • Page 19 RTHB Units with A515 (or Wye-Delta) Starters Figure 17. Power wiring (new wiring bold/highlighted in red) — RTHB To UCP2, J16-1 To TB nuetral To J5-1 on UCP2 To J5-2 on UCP2 To J5-3 on UCP2 UCP2 CT’s To J5-4 on UCP2 To J5-5 on UCP2 To J5-6 on UCP2 2CT1...

  • Page 20: Rthc Units With Easystart (Or Wye-Delta) Starter

    For units with wye-delta starters, remove the associated inadvertently energized. For variable frequency drives contactors and resistors. See “RTHA Units with Wye-Delta or other energy storing components provided by Trane Starters,” p. 8 for an example. or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.

  • Page 21: Installation Of Benshaw Starter

    RTHC Units with EasySTART (or Wye-Delta) Starter Installation of Benshaw Starter Figure 19. Photograph of EasySTART — RTHC Once the EasySTART solid state starter is removed, mount the fan and the Benshaw solid state starter in the cabinet. Figure 20, p. 21 for an approximate location of components.

  • Page 22: Additional Components

    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.
  • Page 23 RTHC Units with EasySTART (or Wye-Delta) Starter Figure 21. Control power wiring (new wiring bold/highlighted in red) — RTHC (MX Starter) To Shunt Trip 1K400 120/240 VAC (input) Benshaw 1K400 1K400 To 1T1 To 1T2 To 1T3 1K300 2K300 1K11/ 1K400 Chiller Module...
  • Page 24 RTHC Units with EasySTART (or Wye-Delta) Starter Figure 22. Control power wiring (new wiring bold/highlighted in red) — RTHC(MX2 Starter)  TO SHUNT TRIP (Breaker) 1K11/ 1K400 120/240 VAC (input) 1K11/ 1K11/ OT SWITCH 1K400 1K400 Optional contact. See note 1. To T1 To T1 To T2...
  • Page 25 RTHC Units with EasySTART (or Wye-Delta) Starter Figure 23. Power wiring (new wiring bold/highlighted in red) — RTHC To UCP2, J16-1 To TB nuetral To J5-1 on UCP2 To J5-2 on UCP2 To J5-3 on UCP2 UCP2 CT’s To J5-4 on UCP2 To J5-5 on UCP2 To J5-6 on UCP2 To TB3 - CT1...

  • Page 26: Rthc Units With It (Or Wye-Delta) Starter

    For variable frequency drives or other energy • 1K400 (replace) storing components provided by Trane or others, refer to • 1TB1 the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with...

  • Page 27: Installation Of Benshaw Starter

    RTHC Units with IT (or Wye-Delta) Starter Installation of Benshaw Starter Figure 25. Photograph of IT solid state starter — RTHC Once all of the above components are removed, see Figure 26, p. 27 for the approximate locations of the new components.

  • Page 28: Additional Components

    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.
  • Page 29 RTHC Units with IT (or Wye-Delta) Starter Figure 27. Control power wiring (new wiring bold/highlighted in red) — RTHC(MX Starter) To Shunt Trip 1K400 120/240 VAC (input) Benshaw 1K400 1K400 1K300 2K300 1K11/ Chiller 1K400 Module J22-1 To J22-1 to shunt Master Oil wire 75A, B trip coil...
  • Page 30 RTHC Units with IT (or Wye-Delta) Starter Figure 28. Control power wiring (new wiring bold/highlighted in red) — RTHC - MX2 Starter  TO SHUNT TRIP (Breaker) 1K11/ 1K400 120/240 VAC (input) 1K11/ 1K11/ OT SWITCH 1K400 1K400 Optional contact. See note 1.
  • Page 31 RTHC Units with IT (or Wye-Delta) Starter Figure 29. Power wiring (new wiring bold/highlighted in red)— RTHC To UCP2, J16-1 To TB nuetral To J5-1 on UCP2 To J5-2 on UCP2 To J5-3 on UCP2 UCP2 CT’s To J5-4 on UCP2 To J5-5 on UCP2 To J5-6 on UCP2 To TB3 - CT1...

  • Page 32: Rthd Units With It Starter

    For variable frequency drives or other energy Starters,” p. 8 for an example. storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable Figure 30, p. 32 shows the basic layout of the IT starter waiting periods for discharge of capacitors.

  • Page 33: Installation Of Benshaw Starter

    RTHD Units with IT Starter Installation of Benshaw Starter Figure 31. Photo of IT solid state starter (PFCC Once the IT starter is removed, refer to Figure 32, p. 33 customer supplied) — RTHD the approximate location of the new components. The Benshaw Redistart SSS is supplied with current transformers.

  • Page 34: All Components Installed

    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.
  • Page 35 RTHD Units with IT Starter Figure 34. Control power wiring (new wiring bold/highlighted in red) — RTHD - MX Starter To Shunt Trip Coil RLC-SVN005B-EN...
  • Page 36 RTHD Units with IT Starter Figure 35. Control power wiring (new wiring bold/highlighted in red) — RTHD - MX2 Starter Optional contact. See note 1. To Shunt Trip Coil 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. RLC-SVN005B-EN...
  • Page 37 RTHD Units with IT Starter Figure 36. Power wiring (new wiring bold/highlighted in red) — RTHD RLC-SVN005B-EN...

  • Page 38: Quick Start, Initial Parameters

    For variable frequency drives or other energy speed, the starter will hold the current at the maximum storing components provided by Trane or others, refer to current level until the UTS timer expires, the motor the appropriate manufacturer’s literature for allowable reaches full speed, or the overload trips.
  • Page 39 “Current Transformer Set-up (MX Only),” p. settings. P6 Software Part Number The software part number is useful for future service reasons. If calling Benshaw for service, this number Table 1. Parameter settings MX/MX2 — Trane ONLY software Parameter Description Setting Range Units Default...
  • Page 40 Quick Start, Initial Parameters Current Transformer Set-up (MX Only) Figure 37. RTHB - Installation of CTs CT Switch Settings When the starter is shipped from the factory, CT settings are set to match CT ratios supplied with the starter. If the MX control is changed the CT settings must be changed to match the CT ratios for that given current rating.

  • Page 41: Remote Keypad

    Remote Keypad “Parts Ordering,” p. 43for appropriate part numbers. Meeting NFPA 70 Figure 40. Benshaw remote keypad MX/MX2 A remote keypad for the Benshaw Redistart is available. In some instances, the remote keypad can be used to meet NFPA 70 guidelines for arc flash protection. The remote keypad has several features some of which are listed below: •...

  • Page 42: Troubleshooting

    Troubleshooting Troubleshooting Table 3. Troubleshooting chart Description of the Problem Possible Causes Chiller starts but only runs for a few seconds. • Typically caused from a mis-wire of the low voltage. Compressor starts immediately when power is applied. • Start command of the Benshaw Redistart wired incorrectly directly to 120 Vdc. Compressor starts, runs less than 10 seconds and...

  • Page 43: Parts Ordering

    Note:For further information on the Benshaw Redistart starters refer to “Benshaw Redistart SSS Hardware Manual #890023-02-01”. Higher amp rated starters are available upon request. Contact technical support or the local Trane parts center for further details. In the Delta RLA = (unit nameplate RLA)*1.05/1.15/1.55 (a) Digit 5 indicates Std (S) or High (H) interrupt rating.

  • Page 44: Mounting Dimensions

    Parts Ordering Mounting Dimensions MX Starter Figure 41. Dimensional drawing of Benshaw solid state starter 1.8.1.1.1.1.1.1.1 Table 5. Mounting dimensions for Benshaw starter Frame Weight Size in (mm) in (mm) in (mm) in (mm) in (mm) in (mm) in (mm) in (mm) in (mm) lbs (kg)
  • Page 45 Parts Ordering MX2 Starter Dimensions Figure 42. MX2 Dimensions Model RB2 125A RB2 156-180A RB2 180-302A RB2 361A Table 6. MX2 dimensions - in (mm) Model RB2 125A 19.5 (495) 12.27 (312) 13.25 (337) 4 (101.6) 0.5 (12.7) 0.31 (7.9) RB2 156-180A 21.25 (540) 12.27 (312)
  • Page 46 Parts Ordering Figure 43. MX2 Board layout RLC-SVN005B-EN...

  • Page 47: Starter Power Leads

    NO LONGER AVAILABLE. See Table 9 starter panel to the compressor motor terminals can be information on MX-to-MX2 logic module conversion. obtained locally or ordered from Trane Service Parts. Table 9. Service components Two wiring kits are necessary for each unit.
  • Page 48 For more information, please visit trane.com or tranetechnologies.com. Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.

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