2. Thermo King
  3. RLFE Bus Contractor Kit 401597

Thermo King RLFE Bus Contractor Kit 401597 Installation guide

  • Hello! I've reviewed the Installation Instructions for the THERMO KING Contactor Kit RLFE Bus 401597. This document provides step-by-step instructions on how to replace the contactor box in your HVAC unit. The kit includes a new contactor box, band wraps, and the necessary instructions. I'm ready to answer your questions about the installation process or the kit's components.
  • What does this kit replace?
    What software version is needed?
    What items are included in the kit?
TK 56941-11-IS Revision A ©2021 Trane Technologies 1
Overview
This retrofit kit replaces the current contactor box in your HVAC unit.
IImmppoorrttaanntt:: Software version needs to be 4.02.04 or higher. Refer to manual 54650 for software
flashloading instructions.
RCS1734
Installation Manual
1 2 34
Item Part Number Description Qty.
1. NSS Contactor box assembly 1
2. NSS Band wrap, 6.575” long 24
3. NSS Band wrap, 3.00” long 12
4. NSS Installation instructions 1
Installation Instructions
RLFE Bus Contactor Kit 401597
2©2021 Trane Technologies TK 56941-11-IS Revision A
Installation Procedures
Contactor Box Removal
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1. Locate the contactor box in your HVAC unit and remove cover.
NNoottee:: Before removing any wires, note how they are routed into the box for reference later.
2. Disconnect and remove all incoming wires going to contactors, terminal blocks and ground
studs inside box.
3. Disconnect 6 pin connector.
4. Remove the four ¼-20 screws and remove box from unit.
a. Save hardware for reuse.
b. The box and cover will not be reused.
Contactor Box Installation
1. Route wire harnesses into the new box as they were originally.
2. Install new contactor box and secure with screws, lock washers and flat washers (removed
earlier) and tighten hardware securely.
3. Reconnect wires and torque per FFiigguurree 11.. NNeeww CCoonnttaaccttoorr KKiitt IInnssttaallllaattiioonn WWiirriinngg DDiiaaggrraamm
aanndd TToorrqquuee SSppeeccss.. oonn ppaaggee 33.
4. Neatly bundle and secure all wiring with provided band wraps.
5. Reconnect the 6 pin connector.
TK 56941-11-IS Revision A ©2021 Trane Technologies 3
Figure 1. New Contactor Kit Installation Wiring Diagram and Torque Specs.
RCS1735-2
22-26 in-lb 22-26 in-lb
15-18 in-lb
15-18 in-lb
11-14 in-lb
4©2021 Trane Technologies TK 56941-11-IS Revision A
Figure 2. Contactor Box Wiring Diagram
RCS1736-1
TK 56941-11-IS Revision A ©2021 Trane Technologies 5
Figure 3. All Torque Specs. Shown
22-26 in-lb 22-26 in-lb
22-26 in-lb 22-26 in-lb
15-18 in-lb
15-18 in-lb
15-18 in-lb
15-18 in-lb
15-18 in-lb
11-14 in-lb
6©2021 Trane Technologies TK 56941-11-IS Revision A
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