Type II — High-PressureQuestion 139 of 240
A technician sets up push-pull recovery on a system with a large liquid charge. How does the push-pull method work?
a.It uses shop air to push refrigerant into the cylinder
b.The recovery machine pushes vapor into the top of the system while pulling liquid out the bottom into the recovery cylinder
c.It relies solely on the system's compressor to move liquid
d.It pulls only vapor from both service ports at once
Explanation
In push-pull recovery, the recovery machine discharges vapor that pushes liquid refrigerant out of the appliance and pulls it into the recovery cylinder, moving a large liquid charge quickly. It is used only on systems with a substantial liquid charge, not on small ones. The method does not use shop air or rely on the system's own compressor.
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