Purging The Stinger - Bacharach High Performance Oilless Commercial Refrigerant Recovery Unit User Manual

Purging the STINGER

The STINGER is equipped with a pump-down purge valve that allows the technician to pump
down or evacuate the STINGER before proceeding to the next recovery operation. This
procedure not only eliminates cross contamination, but also conserves refrigerant. Follow the
steps below to ensure your pump-down operation is performed correctly.
During the purge operation the entire STINGER is pulled into a vacuum, leaving no more
than 0.1 ounce of refrigerant in the unit.
STEPS:
1. After recovery operations are complete, and with the unit still powered ON and running,
make the following control valve position changes (refer to illustration below):
• Turn the inlet valve (blue knob left side) slowly to the "PURGE" position
(pointer DOWN position).
• Turn the purge valve (black knob center) slowly to the "PURGE" position
(pointer DOWN position).
2. The STINGER will now start purging itself of refrigerant. Allow the unit to run until the
inlet gauge indicates that there is an adequate vacuum present in the system.
3. Turn OFF the STINGER and then turn the outlet valve (red knob right side) to its
"CLOSED" position.
Close the Vapor and Liquid valves on the DOT recovery tank.
4.
5. Remove all hoses.
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