USA Lab CLC Series Temperature Probe Replacement Guide (PLC ONLY)

Link to CLC Series Temperature Probe Replacement Guide

Quick Facts

• Total probe channels: 3
  
• Test probe included with kit
• Silver wire = R+, red wires = R– (positions interchangeable)
• Replacement uses 3 butt connectors
  
• Probes correspond to RED, GREEN, BLUE channel wiring

STEP 1 — Access the Interior of the Chiller

• Remove the lid and open the front door of the chiller.
• Locate the probe signal converter, shown in the image on page 1.

STEP 2 — Prepare for Probe Testing

• Remove the wire channel caps to access the probe wiring.
• Use the included test probe to check each of the three channels.

STEP 3 — Channel Wiring Identification

• Page 2 includes both a wiring diagram and a labeled photo:
  • Silver wire = R+
    
  • Both red wires = R– (their positions do not matter)
  • RED = Channel 1 (liquid temperature probe)
    
  • GREEN = Channel 2 (compressor exchanger probe)
    
  • BLUE = Channel 3 (external probe connector)

STEP 4 — Test Each Channel

• Install the test probe on Channel 1, then press Loop on the touchscreen.
• If the loop does not start, the probe on that channel is good—the fault lies on another channel.
• Repeat for all three channels.

STEP 5 — Identify and Cut Out the Defective Probe

• Once the bad probe is identified:
  • Trace the probe wire to where the white and black wires meet the silver and red wires.
  • Cut the connection point where they join.
  • Prepare the replacement using the three butt connectors provided.

STEP 6 — Crimp New Probe Wiring

• Strip back the white and black wires.
• Using a crimp tool, attach the butt connectors as follows:
  • White → Silver
    
  • Black → Red
    
  • Black → Red
    
• After crimping, shrink the tubing ends with a lighter.
• Do not overheat the tubing or wires.

STEP 7 — Install the Replacement Probe

Liquid Temperature Probe (Channel 1 – RED)

• Loosen the set screw on the metal collar.
• Pull the old probe out and insert the new one.

Compressor Exchanger Probe (Channel 2 – GREEN)

• This location requires cutting back insulation.
• Insert the new probe into the same location as the failed one.
• Ensure the slip-over fabric cover is positioned at the wire exit to prevent cuts from sharp metal.
• Images on page 5 illustrate the probe seating and insulation area.

External Probe Connector (Channel 3 – BLUE)

• Replace the probe at the end of the external extension wire.
• Do not replace the internal wiring; only the removable external probe.

Support

If you need help or run into any issues:

📧 support@usalab.com
📞 (734) 855-4890