High head pressures from low ambients can cause insufficient refrigerant flow rates through metering devices, which in turn can starve evaporators .

Question

Quizplus · Accepted Answer

High head pressures from low ambients typically result in excessive refrigerant flow rates through metering devices, not insufficient flow rates. Low ambient conditions can cause the condensing temperature and pressure to drop, which might lead to issues like reduced system capacity or freezing, but not specifically to starving evaporators due to insufficient refrigerant flow.

High Head Pressures from Low Ambients Can Cause Insufficient Refrigerant