A recovery machine is taking longer and longer to bring small appliances down to the required level. What routine maintenance restores its performance?
Correct Answer
A) Change the machine's oil and replace its filter-drier on the manufacturer's schedule
A recovery machine that has slowed down is usually loaded with contaminated oil and a saturated filter-drier. Oil pulled out of the appliances it has serviced carries acid and moisture, which degrade the machine's own compressor, and a plugged drier chokes flow. Following the manufacturer's schedule for oil changes and drier replacement is what keeps a machine hitting its rated recovery level. Certified equipment only performs as certified if it is maintained.
Why This Is the Correct Answer
Recovery machines accumulate oil and contaminants from every system they service. Changing the machine's oil and replacing the filter-drier at the intervals the manufacturer specifies restores flow and protects the internal compressor, which is what brings recovery times and achievable levels back to normal.
Why the Other Options Are Wrong
Option B: Recharge the machine's internal compressor with a fresh refrigerant charge
A recovery machine's compressor is a sealed unit like any other; it is not charged with refrigerant that gets topped off. The refrigerant it handles belongs to the appliances being serviced.
Option C: Replace the machine's pressure switch every time the recovery cylinder is changed
Pressure switches are protective devices that get replaced when they fail, not on a schedule tied to cylinder changes. Doing so would not affect recovery speed.
Option D: Run the machine under a deep vacuum for an hour to burn off internal moisture
Running a machine under vacuum does not remove moisture bound up in its oil or in a saturated drier. Those components have to be changed out.
Memory Technique
The recovery machine drinks whatever the appliance had. Change its oil the way you would change oil in anything that swallows dirt.
Reference Hint
40 CFR 82.158 recovery equipment performance standards; equipment must continue to meet the level it was certified to achieve.
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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