Regulations & Safety第 73 / 240 题
A technician recovering R-404A from a walk-in freezer notices the recovery cylinder is getting cold and recovery has slowed. What technique safely speeds recovery?
a.Heat the recovery cylinder with a torch
b.Cool the recovery cylinder (e.g., with a wet cloth or ice) and/or recover liquid first to lower cylinder pressure
c.Vent some vapor to make room
d.Disconnect and let it finish on its own overnight
解析
Recovery slows as the recovery cylinder warms and its pressure rises, so cooling the recovery cylinder and recovering liquid where possible lowers cylinder pressure and speeds the process. Using a torch is dangerous, venting vapor is illegal, and simply walking away does not complete recovery. Keeping the recovery cylinder cooler than the source lowers the pressure differential the machine must overcome.
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