INFICON Vortex AC Refrigerant Recovery Machine 230V - Manual (Page 10)

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Vortex AC Operating Manual
3.4 Push-Pull Operation
The PUSH PULL method is used to move a large amount of liquid refrigerant
from the system being serviced to the recovery tank without passing it through
the compressor. This method is only useful when more than 7 kg of liquid is
known to be in the system and it can be easily isolated. DO NOT ATTEMPT
the PUSH PULL process unless you are sure of the situation.
Connect the refrigerant hoses as shown in
Figure 3-3 . The addition of a
SIGHT GLASS in the line from the system being serviced to the recovery tank
is an important aid to determine when the liquid has been transferred and
vapor remains.
This process uses the PULL from the exhausted recovery tank and the
Discharge PUSH from the Vortex AC to move the liquid refrigerant. Rates in
excess of 7 kg per minute can be achieved by this procedure.
The SCALE is required in this process to ensure that the tank is not overfilled.
The tank shutoff switch, if used, would stop the compressor but could not
guarantee that additional refrigerant flow would cease because of the
dynamics of the system, thus possibly overfilling the tank.
Figure 3-3 Setup Procedure for Push-Pull Method
3.5 Cooling The Recovery Tank
The Vortex AC can be used to PRE-cool (or SUB-cool) the recovery tank if the
head pressure is too high to complete the recovery process. This can occur
when working with certain refrigerants with a high vapor pressure when the
ambient temperature is high.