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First, letâs define each of these terms: 1  Push System: is a system in which we produce goods based on our best projections of what the market wants. 2  Pull System: is a system in which the production of goods is initiated by the person or organization who consumes that good.
The push-pull recovery method is used for transferring large volumes 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. You should not use the push-pull method if the air conditioning system contains less than 10 pounds of refrigerant, if the system is a heat pump, or if it is a unit with a reversing valve.