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HVAC
11
12
13
14
• Are piping installation points onA/C
compressor free of gas leakage?
• Are piping installation 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?
INSPECT EVAPORATOR PIPING
CONNECTIONS IN COOLING UNIT
FOR LOOSENESS
INSPECT PIPING CONNECTIONS
FOR LOOSENESS
Are piping connections loose?
VERIFYWHETHERMALFUNCTION IS
IN EXPANSION VALVE, AIR MIXAND
COMPRESSOR
OIL
OR
ELSEWHERE
Does refrigerant’s high-pressure value
hardly increase?
If the vane makes a noise, add 10 ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to specified amounts.
If piping is damaged or cracked, replace
it.
If there is no damage, go to next step.
Tighten connections to specified torque.
If the vane makes a noise, add 10 ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to specified amounts.
If the vane makes a noise, add 10 ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Replace O-ring on piping, adjust
refrigerant to specified amounts.
Tighten connections to specified torque.
If the vane makes a noise, add 10 ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to specified amounts.
If the vane makes a noise, add 10 ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to specified amounts.
Go to next step. ( Pressure hardly
increases.)
Go to step 17.
Yes
No
Yes
No
Yes
No
Yes
No
STEP INSPECTION
ACTION