Push-Pull Operation - Inficon Vortex Dual 714-202-G Serie Manual De Funcionamiento

3.4 Push-Pull Operation

The push-pull recovery method is used to move large amounts of liquid
refrigerant. During this process, the recovery unit pulls vapor from the recovery
cylinder and produces high pressure discharge gas that pushes liquid out of
the HVAC system and back into the recovery cylinder. Recovery rates above
15 pounds per minute can be achieved when using this procedure.
NOTE: Do not attempt the push-pull process unless the system contains
at least 15 pounds (7 Kg) of liquid that can easily be isolated.
To prevent overfill, use the scale to make sure the tank does not surpass
80% capacity, by weight. Monitor the tank weight carefully as 80% capacity
maybe reached quickly during push-pull due to its rapid transfer.
Connect the refrigerant hoses (see
help determine when the liquid has been transferred and vapor remains.
Figure 3 Setup procedure for push-pull method
LP HP
CLOSE
OPEN PURGE
FILTER
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Vortex Dual Operating Manual
Figure
VAPOR
RECOVER
PURGE
3). A sight glass, not included, can
CYLINDER/
TANK
SCALE
LIQUID
LP
HP