1.32 UI Replacement

Power Down Plunge

• Pause the chiller by pressing the pause button on the UI.
  • ⚠️ Powering down the Plunge while it's in a cooling cycle can damage the chiller. 
• Once the chiller is in idle mode press the test button on the GFCI outlet to power down the Plunge.
• Unplug the GFCI outlet from the outlet.

🚨 Important: Do not power down the Plunge before pausing the chiller. Powering down the Plunge while it is in a cooling cycle can damage the chiller.

Remove Chiller Vents and Thumb Nuts

• Remove both side chiller vent panels.

• Unscrew all 6 thumb nuts securing the rear panel:

  • 3 on the left vent

  • 3 on the right vent

Remove Rear Cover

• Grab the rear cover by the vent openings and slowly pull and wiggle the rear cover free. 

Disconnect Water Filter Assembly

• Wrap the hex bolt driver in a towel or rag to protect the plastic nut from damage.
• Locate the notched corner of the plastic nut securing the water filter housing and align the wrapped hex bolt driver with the notch.
• Loosen the Plastic Nut by using a rubber mallet or hammer and GENTLY TAP the end of the wrapped driver

  • 🚨 Apply soft, controlled strikes — go slow and steady to avoid cracking the plastic

• Once the nut is loose enough, finish unthreading it by hand.
• Use one hand to support the bottom of the water filter housing as the nut is removed.

Disconnect Electrical Components

• Disconnect all electrical components by unscrewing the threads and pulling.

• The LED wire should be moved to the back of the chiller and set aside.

Remove E-Box Mounting Nuts

• Cut 2 zip ties securing the power cord to the frame near the electrical box.
• Using an 8mm hex driver, remove the 4 mounting nuts securing the e-box to the tub.

Move E-box Behind TH-1 Manifold

• After removing the 4 mounting nuts, gently lower the e-box from its mounted position.

• Pull the TH-1 manifold forward slightly to create room behind it.

• Carefully move the e-box behind the TH-1 manifold.

• Once positioned, allow the e-box to rest securely behind the TH-1 manifold against the tub basin.

🚨Make sure the UI ribbon cable and other wires do not snag or catch on any components.

Remove UI

• Locate the ribbon cable connected to the back of the UI.

• Push the wing tabs on the ribbon cable connector apart—one up and one down—to release the cable.

• Gently remove the ribbon cable and tuck it safely behind the TH-1 manifold.

• Using a 7mm hex driver (flex-head recommended), remove the four nuts securing the UI to the tub—two on each side.

• As you loosen the final nut, support the UI from the front to prevent it from falling.

• Once all nuts are removed, carefully pull the UI out of the tub.

• Set aside and save all nuts and washers for installing the new UI.

Install UI

• Place the new UI into the cutout on the front of the tub.

• Hand-thread all four mounting nuts onto the UI bolts—two on each side.

• 🚨 Ensure the UI is aligned properly and seated securely in the opening.

• Once all nuts are hand-tightened and the UI is held in place, use a 7mm hex driver to fully tighten each nut.

• Make sure all fasteners are snug and the UI is firmly secured to the tub.

Connect Ribbon Cable to UI

• Retrieve the UI ribbon cable from the electrical box.

• Position the ribbon cable so that the red stripe is facing down.

• Insert the cable into the connector on the back of the UI.

• Once the cable is fully inserted, secure it in place by closing the wing tabs around the ribbon cable.

• Double-check that the connection is snug and properly aligned.

Mount & Secure E-box

• Carefully lift and maneuver the e-box back onto the mounting bolts at the top of the chiller cabinet.

• Align the e-box with the bolt pattern on the frame and gently seat it into position.

• Hand-thread all four 10mm mounting nuts onto the bolts to hold the e-box in place.

• Once all nuts are hand-tightened, use a hex driver to securely tighten each one.

• Confirm the e-box is firmly mounted and does not move or wobble

Zip Tie E-box Power Cord

• Zip tie the power cord near the e-box where the original ties were cut.

• If you previously cut zip ties on the opposite side of the chiller, route the power cord back along the same path.

• Run the power cord over the top of the fan to keep it clear of all moving parts and components.

• Use additional zip ties as needed to ensure the cord is secure and snug along the frame.

• Confirm that the cord is fully supported and not in contact with any sharp edges or moving parts.

Reconnect Electrical Components

• Plug in all electrical connectors to their labeled receptacles.

• Identify each component by the labels on the wires
• Ensure all components are secured screwed and pushed in.

Reconnect Water Filter Assembly

• Lift the water filter housing and align it with the threaded post on the tub.

  • 🚨 Ensure the two nodes on top of water filter housing line of with two cutouts where the water filter housing mounts to the tub.

• Begin threading the plastic nut onto the post by hand, ensuring it is not cross-threaded.

• Once the nut is hand-tight, wrap a towel or rag around a hex bolt driver to protect the plastic.

• Place the wrapped driver against one of the nut’s notches and gently tap with a rubber mallet to snug it into place.

• Apply light, controlled taps until the nut is fully tightened and the water filter housing is secure.

• Ensure the housing is firmly seated and does not move or shift when lightly pushed.

Tighten Water Filter Housing Unions

• Locate the TH-1 manifold union on the right side of the water filter housing.

• Hand-tighten the union to ensure a secure, leak-free connection.

• Locate the Flow Meter manifold union on the back side of the water filter housing.

• Hand-tighten this union as well until it is snug.

⚠️ Do not use tools to tighten—hand-tightening is sufficient and helps prevent damage to the fittings.

Test for Leaks

⚠️ Warning: The chiller fan is exposed during testing. Keep hands, tools, and loose items away from the fan to avoid injury or equipment damage.

• Plug in the Plunge and press the “Reset” button on the GFCI plug to power it on.

• Set temperature to 50 degrees so pump powers on 100%.

• Allow the Plunge to run and observe the chiller plumbing union connections.

• Carefully inspect all union fittings for any signs of leaking while the system is running.

• If a leak is found, pause the system and recheck that the union is properly seated and hand-tightened.

Power Down Plunge

• Pause the chiller by pressing the pause button on the UI.
  • ⚠️ Powering down the Plunge while it's in a cooling cycle can damage the chiller. 
• Once the chiller is in idle mode press the test button on the GFCI outlet to power down the Plunge.
• Unplug the GFCI outlet from the outlet.

🚨 Important: Do not power down the Plunge before pausing the chiller. Powering down the Plunge while it is in a cooling cycle can damage the chiller.

Test UI for Functionality

• Fill the Plunge up with water so the water line is 6" below the edge of the tub.

• Plug the Plunge back into the power outlet.

• Press the Reset button on the GFCI plug to power on the unit.

• Wait for the startup sequence to complete and confirm that the water temperature displays on the UI screen.

• Test each UI button to ensure proper functionality:

  • Press the down button and confirm the temperature decreases.

  • Press the up button and confirm the temperature increases.

  • Press the light button and check that the LED light turns on.

  • Press the pause button and confirm the chiller stops running.

  • 🚨 Leave Plunge paused when powering down to install rear cover

• Confirm that all UI buttons respond correctly and the display is working properly.

🚨 Powering down Plunge while it is in a chilling cycle can damage the chiller. Pause chiller before powering down Plunge.

Install Rear Cover & Chiller Vents

• Slide the rear cover into place.

• Install all 6 thumb nuts (3 per side).

• Reinstall left and right vent panels.

Finalize Job

• Complete the End-of-Job Checklist:

  • Confirm all connections are secure

  • Clean up tools and work area

  • Check for leaks or loose fittings

  • Ensure everything is reinstalled properly