Welbilt FB081TF, Service Manual

Page: 81 / 96

Part Number REV00 04/08/2020 81
Section 7 Component Check Procedures
System Contamination Clean-Up
GENERAL
This section describes the basic requirements for restoring
contaminated systems to reliable service.
Important
Multiplex assumes no responsibility for the use
of contaminated refrigerant. Damage resulting
from the use of contaminated refrigerant is the
sole responsibility of the servicing company.
DETERMINING SEVERITY OF CONTAMINATION
System contamination is generally caused by either
moisture or residue from compressor burnout entering the
refrigeration system.
Inspection of the refrigerant usually provides the first
indication of system contamination. Obvious moisture or an
acrid odor in the refrigerant indicates contamination.
If either condition is found, or if contamination is suspected,
use a Total Test Kit from Totaline or a similar diagnostic tool.
These devices sample refrigerant, eliminating the need to
take an oil sample. Follow the manufacturer’s directions.
If a refrigerant test kit indicates harmful levels of
contamination, or if a test kit is not available, inspect the
compressor oil.
1. Remove the refrigerant charge from the ice machine.
2. Remove the compressor from the system.
3. Check the odor and appearance of the oil.
4. Inspect open suction and discharge lines at the
compressor for burnout deposits.
5. If no signs of contamination are present, perform an acid
oil test.
Check the chart to determine the type of cleanup required.
Contamination Cleanup Chart
Symptoms/Findings Required Cleanup Procedure
No symptoms or suspicion of
contamination
Normal evacuation/recharging
procedure
Moisture/Air Contamination
symptoms
Refrigeration system open to
atmosphere for longer than
15 minutes
Refrigeration test kit and/
or acid oil test shows
contamination
No burnout deposits in open
compressor lines
Mild contamination cleanup
procedure
Mild Compressor Burnout
symptoms
Oil appears clean but smells
acrid
Refrigeration test kit or acid oil
test shows harmful acid content
No burnout deposits in open
compressor lines
Mild contamination cleanup
procedure
Severe Compressor Burnout
symptoms
Oil is discolored, acidic, and
smells acrid
Burnout deposits found in the
compressor, lines, and other
components
Severe contamination cleanup
procedure