Halfway through recovering a row of chest freezers at a recycling yard, the scale shows that the recovery cylinder has reached the weight corresponding to its fill limit. What is the correct next step?
Correct Answer
A) Close the cylinder valves, set it aside, and continue the work into a second empty cylinder
The fill limit exists because a cylinder filled beyond it has no vapor space left to absorb the expansion of the liquid when the cylinder warms up. That is a rupture risk in a truck on a summer afternoon, and it does not wait for a shipping document to become dangerous. The only correct move when the scale reaches the number is to stop, close the valves, and change cylinders. Bleeding the vapor space is a knowing release, and chilling changes the pressure but not the weight the limit is written against.
Why This Is the Correct Answer
The limit is a weight of refrigerant relative to the cylinder's capacity, and it protects the vapor space that liquid needs in order to expand as the cylinder warms. Once the scale reaches it, the cylinder is finished for this job. Closing both valves, labelling it and starting a fresh cylinder keeps the work moving without ever putting an overfilled cylinder on the truck.
Why the Other Options Are Wrong
Option B: Keep going, since the limit is a shipping rule and applies only once the cylinder travels
The hazard is hydrostatic expansion inside the cylinder as it warms, which happens sitting on the shop floor just as readily as on a highway. The limit applies from the moment the refrigerant goes in.
Option C: Vent the vapor space down a few pounds so the cylinder can take the remaining freezers
Releasing refrigerant to make room is a knowing venting violation, and it defeats the purpose of the recovery that has just been performed on those freezers.
Option D: Chill the cylinder in ice water so the refrigerant packs into a smaller space inside it
Cooling lowers the pressure but the limit is written as a weight, and the refrigerant is still all in there. The cylinder warms back up to room temperature overfilled.
Memory Technique
The empty fifth of the cylinder is not wasted space. It is where the liquid goes when the sun comes out.
Reference Hint
Recovery cylinders are filled to no more than eighty percent of capacity, measured by weight on a scale.
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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