Type II — High-Pressure第 126 / 240 题
A technician wants to speed up vapor recovery from an R-410A condensing unit. Which practice will increase recovery speed?
a.Recovering only through the smallest available Schrader port
b.Closing the recovery machine's discharge valve partway
c.Making the connecting hoses as long and thin as possible
d.Using large-diameter, short hoses and cooling the recovery cylinder
解析
Recovery speed improves with large-diameter, short hoses that reduce flow restriction, and with a cool recovery cylinder that keeps its internal pressure low so refrigerant flows into it. Long, thin hoses and tiny ports restrict flow and slow recovery. Chilling the cylinder (for example in ice water) creates a favorable pressure difference.
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