A household refrigerator has been transported lying on its side and has just been stood upright on the shop floor. What should happen before it is plugged in and run?
Correct Answer
C) It should be left standing upright for several hours so the oil drains back to the compressor
Laying a refrigerator over lets oil run out of the compressor sump and into the discharge line, the condenser and sometimes further. Starting the compressor before that oil has drained back means running it dry for the first minutes, and pumping a slug of liquid oil through a system built to move vapor. Both shorten the compressor's life, and a slug can break valves outright. Standing the cabinet upright for several hours, and overnight if it travelled on its back, lets gravity put the oil where it belongs before power is applied.
Why This Is the Correct Answer
Oil migrates out of the compressor when the cabinet is laid over and needs time and gravity to return. Standing the unit upright and waiting lets the sump refill before the compressor is asked to work. The wait is measured in hours rather than minutes, and manufacturers commonly specify a period matching the time the appliance spent on its side.
Why the Other Options Are Wrong
Option A: It should be run in short bursts of a minute at a time until the compressor quietens
Short bursts still start a compressor with an empty sump and with oil sitting in the discharge line, and they add repeated starting stress on top of it.
Option B: It should be tipped the other way once to move the oil back through the discharge line
Tipping the cabinet the other way moves oil somewhere else rather than back to the sump, and it risks pushing it further into the system.
Option D: It should be plugged in immediately, since the sealed system is unaffected by its position
Position very much affects the sealed system. Transport orientation is why manufacturers print upright arrows on the carton and why delivery crews are trained around it.
Memory Technique
Oil obeys gravity, not schedules. Give it the hours.
Reference Hint
Stand a refrigerator upright for several hours before running it if it has been transported lying down, so oil drains back to the compressor.
More epa-608-type-1 Questions
An under-counter ice maker is one factory-sealed cabinet, while a modular ice machine head is joined to a remote condenser by field-run tubing. What certification does servicing the modular machine's circuit require?
A technician recovers refrigerant from a small appliance using a recovery machine that was manufactured in 1991. What recovery level must that older equipment achieve?
Two technicians recover from identical refrigerators with working compressors, one using a 1991 recovery machine and the other a 2015 machine. Why do their required recovery levels differ?
System-dependent recovery equipment may be used only on appliances that normally hold up to what amount of refrigerant?
What feature defines a self-contained recovery unit and sets it apart from the system-dependent kind?
When system-dependent recovery equipment is used on a small appliance whose compressor still runs, how can that working compressor be put to use?
Recovery from a small appliance has slowed down and the pressure is barely moving. What accepted technique helps drive the remaining refrigerant out?
After the recovery unit stops pulling on a small appliance, how does a technician confirm that the recovery is actually complete?
A sealed small appliance offers no service port at all. What has to happen before recovery equipment can be connected to it?
As refrigerant from a string of small appliances collects in a recovery cylinder, what fill limit applies to that cylinder?
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