Replacing The Compressor, Compressor Ptc Starter And Overload Protector; Replacing The Filter Dryer - EdgeStar CWB8420DZ Service Manual

8.9 Replacing the Compressor, Compressor PTC Starter and Overload Protector

NOTE: Before replacing any component of the refrigeration system, make sure to read the
instructions "Service Precautions for R600A System".
All replacement compressors are charged with the correct amount of oil and a holding charge of
dry nitrogen. The holding charge assures that the compressor is dry and ready to install. If you
receive a replacement compressor that shows no evidence of holding charge when you center
the lines or remove the plugs, return it.
1. Disconnect the unit from its power source.
2. Remove all R600a from the unit in a well ventilated area.
3. Clean and desolder (or cut) the refrigerant lines as close as possible to the compressor
stubs, leaving enough length to install the replacement compressor.
4. Disconnect the PTC Starter and Overload Protector from compressor terminals.
5. Remove the bolts from the compressor mounts. Remove defective compressor from
cabinet and install rubber grommets on replacement compressor.
6. Clean the compressor stubs with an abrasive cloth. Do not open the compressor stubs yet.
7. Install the replacement compressor using the bolts previously removed.
8. Solder a short piece of tubing to the process tube (approximately 150mm / 6 inches long).
9. Reconnect the refrigerant tubing to the compressor stubs after removing the rubber plugs.
10. Recharge and leak test the system.
11. Replace the PTC Starter and Overload Protector. Reconnect the compressor leads.
12. Run the unit to test.

8.10 Replacing the Filter Dryer

NOTE: A new filter dryer must be installed each time any component of the refrigeration system
is opened or replaced.
1. Disconnect the unit from its power source.
2. Remove all R600a from the unit in a well ventilated area.
3. Carefully desolder the old filter dryer
4. Use fine sandpaper to clean the capillary tube
dryer input tubing
5. Use a knife or file to score the capillary tube and the input tubing to the old filter dryer 1 inch
from the original joints. Then break the connections cleanly.
6. Use fine sandpaper to clean both ends of the new filter dryer.
7. Offset 1/2" the end of the capillary tube to prevent it from penetrating too far into the dryer.
8. Connect the capillary tube to the replacement filter dryer.
9. Connect condenser outlet tube to the replacement filter dryer
10. Solder in the new filter dryer using silver solder with the proper flux to the condenser outlet/
filter dryer joint. Use Sil-Fos at the capillary tube/filter dryer joint.
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4 (the condenser outlet tube) 3 inches from the original joint.
2 out of the compressor compartment.
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1 3 inches from the original joint, and filter