How to Replace a Chest Freezer Compressor

open, white chest freezer
  • 4 hours
  • Advanced
  • 250
What You'll Need
A new compressor
New charging tube
Screwdriver (Philips and flat)
Map gas with torch
Silver rod
Long nose pliers
Vacuum pump
Manifold gauge
Freon 134A

A chest freezer compressor is crucial to the freezing cycle. The compressor is normally at the bottom of the freezer in the back; it is almost always black and about the size of a football. Replacing a compressor can be a bit intricate and requires a great amount of patience. You have to have sufficient familiarity with the parts, the terminology, and the tools that should be utilized. However, by taking small steps in conjunction with strong determination, you will be able to handle the replacement.

Step 1 - Remove the Old Compressor

Make sure the freezer is unplugged.

Simply remove the cover of the area of the freezer where the compressor is located. Using long-nose pliers remove the clip cover; remove the cover overload using your hand. Take out the clip overload using the long nose pliers.

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Because the compressor is connected through the common (attached by an overload), running, and starting terminals (both are attached by a relay), you have to individually remove these connections using your hands. Keep them for later use.

Free the compressor from the remaining freon by breaking the charging tube using the long nose pliers.

Use a torch with Mapp gas to disconnect the suction and the discharge tubes from the compressor.

Detach the compressor by removing the bolts and nuts attached to the compressor base. Keep the bolts and nuts for later use.

Step 2 - Install the New Compressor

Attach the new compressor to the compressor base using the bolts and nuts.

Use a torch with Mapp gas and the silver rod to connect the suction and discharge tubes and install a new charging tube.

Before fitting in the removed overload to the common terminal put in the clip overload; immediately attach the running and starting terminal using the relay.

Use the manifold to thread the neutral pressure gauge (NPG) to the vacuum pump to take out existing air and any tiny particles from the tubing and the compressor. Plug in the vacuum pump and let it work for 30 minutes; check if compressor and tubing are totally voided of air. The low-pressure gauge (LPG) of the manifold gauge should indicate a negative pressure. Close the LPG knob. Turn off the vacuum pump.

Transfer the NPG from the vacuum pump to the freon tank. Open the freon tank and loosen the NPG valve to release existing air off the hose. You can now start charging freon to the compressor based on the suggested PSI of the freezer (check the sticker found at the back of the freezer).

Plug in the chest freezer while waiting for the freon to regulate.

Step 3 - Finish Up

After everything is good, close the freon tank and gently remove the hose connected to it. Slide in the compressor to its proper place.

That’s it. You have just successfully replaced your chest freezer compressor.

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