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12. Slowly open the input port of the recovery
pump. Once the liquid has been recovered,
fully open the input valve.
13. Run the recovery pump until a 15-inch
vacuum is achieved.
14. After recovery is complete, self-purge the
recovery pump.
Self-Purge/Auto Evacuate
The hygroscopic nature of the oils used in R-410A
systems cannot be over-emphasized. Moisture
can be a significant problem affecting the proper
operation and life expectancy of any system
operating on the mechanical refrigerant cycle.
Therefore, it is more important than in the past
to take precautions to keep moisture out of a
system during installation and service. Evacuate
to 15-inch vacuum and replace filter-driers when
a system has been opened. Questionable
workmanship that may have been acceptable
when working on R-22 systems cannot be
tolerated by R-410A systems.
After Recovery Is Complete:
1. Close the input port valve.
2. Turn the recovery pump off.
3. Set the Recover/Purge valve to PURGE.
4. Restart the recovery pump until a 15-inch
vacuum is achieved.
5. Turn unit off, reset Recover/Purge to Recover,
and remove the tap valve from the process
stub tube.
The pump is now ready for another recovery.
Summary of Normal System Recovery
1. Inspect the recovery pump thoroughly to
ensure that it is in good operating condition.
2. Connect recovery tank to recovery pump and
make sure all connections are correct and
tight.
3. Open the liquid port of the recovery cylinder.
(Always open valves slowly to check hoses
and connections for leaks.)
4. Make sure the Recovery/Purge valve is set
on Recover.
5. Open the output port of the recovery pump.
6. Open the tap valve on the sealed system.
7. Switch the main power to ON. The fan should
be running.
8. Press the compressor START switch.
9. Slowly open the input port on the recovery
pump.
10. Run recovery pump until the desired vacuum
is achieved.
11. Close tap valve.
12. Close the recovery pump input port.
13. Turn off recovery pump.
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(Continued next page)
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