Push-Pull Operation; Cooling The Recovery Tank - JB INDUSTRIES F6-DP Instructions D'utilisation

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 a 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 be easily 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 Figure 3). A sight glass, not included, can help determine
when the liquid has been transferred and vapor remains�
Figure 3 - Setup Procedure For Push-Pull Method

COOLING THE RECOVERY TANK

The F6-DP can be used to pre-cool (or sub-cool) the recovery tank, if the head pressure is too
high to complete the recovery process� If the ambient pressure is too high, high head pressure
can occur when working with certain refrigerants that have a high vapor pressure�
NOTE: The recovery tank must contain five pounds or more of liquid,
to allow the pressure differential to develop�
Sub-cooling the tank before starting the recovery process may provide little or no benefit�
If the recovery process stalls because of high head pressure, turn off the F6-DP, close the
hose valves, and reconfigure the setup as shown in (See Figure 4).
F6-DP OPERATING MANUAL
JB INDUSTRIES
11