Model 3600
Refrigerant Recovery System
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4.7. Pump Down Operations
The Model 3600 is equipped with a pump-down purge valve that allows the technician to pump down or
evacuate the 3600 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.
Step
Description
1
After recovery operations are complete and the system switch is in the OFF position:
FIRST
- Place the inlet valve in the PURGE position
SECOND
- Place the purge valve in the PURGE position
THIRD
- Place the outlet valve in the OPEN position as illustrated below.
It is important to turn the valves in this order to ensure the compressor properly
equalizes.
2
Turn the system switch to the “ON” position. The LED status will be green.
NOTE:
If the compressor fails to start, cycle the purge valve from the RECOVERY to PURGE
position to reduce the pressure difference shown on the system’s gauges.
3
Allow the unit to run until it shuts off automatically. The status display will flash “EVACUATION
COMPLETE” indicating that the purge operation is complete.
4
Turn the system switch to the OFF position and turn the outlet valve to the “CLOSE”
position. Close the inlet and outlet valves on the DOT recovery tank.
During the pump down operation, the 3600’s compressor pulls the entire system and discharge hose into
a vacuum and discharges the gas directly out of the discharge port leaving no more than ¼ ounce of
refrigerant left in the system.
CAUTION! Never turn the purge valve when the unit is operating! Severe damage may occur.
Figure 5. Model 3600 Valve Settings for Pump Down Operation
