Pumping Down an AC or Refrigeration System
- Switch off the air conditioning unit
- Connect the manifold to the low pressure service valve
- Using your refrigeration service tools, release the nut on the service valve, to a mid-way position between fully opened and fully closed. You should see that that the pressure gauge reading will increase on the manifold gauge.
- Operate the air conditioning unit for 3 to 5 minutes,
- Isolate the liquid line by closing off the liquid line service valve. You should start to see the reducing pressure reading on the manifold gauge.
- Once the pressure reads zero, isolate the vapour line service valve by closing the service valve off,
- Evacuate the system after the repair and maintenance work by using a high performance Javac Vacuum Pump to 25 microns or less. This step is very important otherwise your system will not operate correctly. This is to remove the moisture and oxygen.
- Next open the service valves and wait for 5 minutes for the refrigerant to disperse.
- You may now turn of the air conditioning or refrigeration unit.
- It is suggested that you use a Hand Held Leak Detector to check for any leaks around any new joins or changes to the refrigerant piping.
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