820 / 1428
850
HVAC
INSPECT REFRIGERANT LINE
Inspect refrigerant lines.
• Is piping free of damage and cracks?
• Are piping connections free of oil
grime?
(Visual Inspection)
• Are piping connections free of gas
leakage?
• Are piping installation points on
condense free of gas leakage?
• Are piping installation points on
receiver/drier free of gas leakage?
• Are piping installation pints on A/C
Compressor free of gas leakage?
• Are piping installation points on
cooling unit free of gas leakage
• Perform gas leak inspection using gas
leak tester.
Are above items okay?
INSPECT EVAPORATOR PIPING
CONNECTIONS IN COOLING UNIT
FOR GAS LEAKAGE
Are piping connections for evaporator
in cooling unit free of gas leakage?
VERIFYWHETHERMALFUNCTION IS
IN COMPRESSOR OIL OR
ELSEWHERE
Add 30 ml of compressor oil.
Is noise heard when racing engine?
VERIFYWHETHERMALFUNCTION IS
IN A/C COMPRESSOR OR
ELSEWHERE
Drain compressor oil.
Is it contaminated with metal particles?
VERIFYWHETHERMALFUNCTION IS
SOMEWHERE IN A/C SYSTEM OR
ELSEWHERE
Is compressor oil whitish and mixed
with water?
Go to next step.
If piping orA/C component (s) is damaged
or cracked, replace then go to Step 19.
If there is gas leakage, repair or replace
connection and replace condenser, then
go Step 19.
Adjust refrigerant amount to specified level,
then go to Step 19.
If piping damaged or cracked, replace
then go to Step 19.
If there is gas leakage, repair or replace
connection and replace condenser then
go to Step 19.
Go to next step.
Troubleshooting completed.
Explain repair to customer.
Go to next Step.
ReplaceA/C compressor, then go to Step
19.
Replace entire A/C system (excluding
heater), then go to Step 19.
Go to next step.
Yes
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No
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No
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No
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STEP INSPECTION
ACTION