64 51... Leak-testing evaporator
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WARNING:
It is essential, when handling nitrogen, to observe the standard national safety regulations.
Ensure that employees are advised of how to handle pressurized vessels and nitrogen correctly (danger of asphyxiation). For this purpose, follow the notes and instructions in the technical safety specifications available from the gas supplier.
Ensure that employees are advised of how to handle pressurized vessels and nitrogen correctly (danger of asphyxiation). For this purpose, follow the notes and instructions in the technical safety specifications available from the gas supplier.
Necessary preliminary tasks:
- Remove expansion valve , see 64 51 525 Removing and installing or replacing expansion valve
Replace sealing rings (1) and coat with refrigerant oil.
Mount special tool 64 5 125 and retainer (1) with screws of expansion valve.
Tightening torque 64 53 2AZ , see 64 53 REFRIGERANT LINES AND EXPANSION VALVE .
Connect special tool 64 5 121 to special tool 64 5 125.
IMPORTANT:
Risk of damage: Use only nitrogen pressure bottles with pressure reducers for leak-testing.
Pressurize evaporator to 10 bar slowly only. Excessively fast pressurization and pressures in excess of 20 bar may cause damage to the evaporator.
Pressurize evaporator to 10 bar slowly only. Excessively fast pressurization and pressures in excess of 20 bar may cause damage to the evaporator.
Connect nitrogen pressure bottle with pressure reducer to pressure gauge and then connect to special tool 64 5 121 (connecting hose).
NOTE:
Apply test pressure of 10 bar slowly and close nitrogen pressure bottle.
Check leak-tightness of testing apparatus and of connection to refrigerant line.
Set test pressure of 10 bar is only permitted to drop by 2 bar to 8.5 bar over a test period of 1.5 hours.
If the pressure loss is greater than 1.5 bar, this indicates that there is a leak in the evaporator unit.
- Testing apparatus must be leakproof.
- Ambient temperature and temperature of vehicle must not change during the test procedure.
- Do not move the vehicle during this period
Apply test pressure of 10 bar slowly and close nitrogen pressure bottle.
Check leak-tightness of testing apparatus and of connection to refrigerant line.
Set test pressure of 10 bar is only permitted to drop by 2 bar to 8.5 bar over a test period of 1.5 hours.
If the pressure loss is greater than 1.5 bar, this indicates that there is a leak in the evaporator unit.
WARNING:
After leak-testing, unscrew special tool 64 5 121 slowly
from special tool 64 5 125
to reduce pressure.
After leak-testing:
- Replace all sealing rings and moisten with refrigerant oil