A technician relies on a platform scale to weigh recovered refrigerant against a data plate charge and to weigh new charges in. Which routine check keeps those readings trustworthy?
Correct Answer
D) Setting a known test weight on the platform and confirming the display matches it
Zeroing a scale with the cylinder on it removes the cylinder's weight, which is useful, but it says nothing about whether the scale reads a change in weight correctly. Only a known reference answers that. A calibration weight, or any object whose weight has been established on a scale known to be good, placed on the platform and compared with the display, tells the technician whether an eight ounce reading really means eight ounces. On charges measured in ounces, a scale reading a few percent off is enough to leave a refrigerator undercharged.
Why This Is the Correct Answer
Taring establishes a starting point; a known weight establishes accuracy. Placing a reference weight on the platform and comparing it with the display is the only check that catches a scale reading high or low, which is the failure that matters when a small appliance charge is a matter of ounces and the acceptable error is a fraction of one.
Why the Other Options Are Wrong
Option A: Zeroing the scale with the empty cylinder sitting on it at the start of every job
Taring the cylinder is good practice for reading a gain, but a scale that is off by five percent will tare perfectly and still report the wrong amount recovered.
Option B: Storing the scale in the coolest part of the van so its readings stay consistent
Scales do drift with temperature, but storage location is not a check. It neither detects nor corrects an error in the readings.
Option C: Replacing the scale's batteries whenever a reading disagrees with the data plate
Fresh batteries fix a dying display, not an error in the load cell, and treating a disagreement with the data plate as a battery problem hides a real fault.
Memory Technique
Zero tells you where you started. A known weight tells you whether the numbers mean anything.
Reference Hint
Verify a charging or recovery scale against a known reference weight, since small appliance charges are measured in ounces.
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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