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Installation and Operation
Evacuating A/C System
Use this procedure to remove non-condensible gases and
moisture from the vehicle A/C system.
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If the gauges indicate pressure, recover refrigerant
from the service hoses before proceeding. Refer to
Evacuating Service Hoses in this Chapter.
1. Open the following:
— Red service hose hand valve or coupler,
— Blue service hose hand valve or coupler,
— High side manifold hand valve,
— Low side manifold hand valve, and
— Yellow service hose hand valve.
2. Turn the Compressor switch ON.
The COMPRESSOR ON indicator illuminates and the
compressor activates.
3. Turn the vacuum/recycle valve to VACUUM.
The low side manifold gauge shows vacuum increasing.
3
Follow the manufacturer recommendations for
evacuation time, usually at least 30 minutes.
4. Close the manifold hand valves when the desired vacuum
and duration have been reached.
5. Turn the Vacuum/Recycle valve OFF.
6. Turn the compressor switch OFF.
The COMPRESSOR ON indicator goes out and
compressor stops running.
7. Monitor the low side pressure for 5 minutes.
Any rise in vacuum indicates a leak in the vehicle
system.
3
If the source of the leak cannot be determined, partially
charge the system and perform a leak test using an
electronic leak detector.
8. When the leak is identified, repeat Recover/Recycle
procedure, repair the leak and attempt the Evacuation
procedure again.
Evacuation is complete.