A legacy freezer system charged with R-12 normally holds ninety pounds, and the technician is using a recovery machine built in 2000. A helper says ninety pounds is well under two hundred, so the system only needs to come to atmospheric pressure. What level actually applies?
Correct Answer
B) Ten inches of mercury vacuum
The shallow zero inch entry belongs to the R-22 line only. Appliances using the other high-pressure refrigerants, R-12 among them, have their own pair of rows, and the row for charges under two hundred pounds asks for ten inches of mercury vacuum when the recovery equipment was built on or after November 15, 1993. The helper has applied the R-22 rule to a refrigerant that does not share it, which is one of the most common ways this table is misread.
Why This Is the Correct Answer
Charge size alone does not decide the level. An appliance under two hundred pounds still has to be placed in the right refrigerant family first. For the group that covers R-12 and its relatives, a charge below two hundred pounds worked with equipment built on or after November 15, 1993 must be brought to ten inches of mercury vacuum, not to atmospheric pressure.
Why the Other Options Are Wrong
Option A: Zero inches of mercury vacuum
Zero inches is the entry on the R-22 line for charges under two hundred pounds. R-12 sits on a different line, so the helper's shortcut leaves refrigerant in the freezer.
Option C: Fifteen inches of mercury vacuum
Fifteen inches belongs to this same refrigerant group only once the normal charge reaches two hundred pounds. A ninety pound system has not crossed that split.
Option D: Twenty-five inches of mercury vacuum
Twenty-five inches of mercury vacuum is a low-pressure chiller number and has no place on a high-pressure freezer system of any size.
Memory Technique
Ask the refrigerant first, the weight second. Zero inches is an R-22 privilege, not a small-charge privilege.
Reference Hint
Other high-pressure appliance, less than two hundred pounds, equipment built on or after November 15, 1993: ten inches of mercury vacuum.
More epa-608-type-2 Questions
A walk-in cooler condensing unit holds a full charge of twenty-five pounds of R-404A, which is below the fifty pound threshold that brings an appliance under the leak repair provisions. What still applies to this unit?
An office building has thirty water source heat pumps on a common water loop, and each one left the factory assembled, hermetically sealed and charged with four pounds of R-410A. How is one of those units classified?
A data sheet for an unfamiliar refrigerant lists a boiling point of about fifty-five degrees Fahrenheit at atmospheric pressure. What does that tell a technician holding Core and Type II certification?
A technician holds Core, Type I and Type III certification and is sent to recover the charge from a twenty ton rooftop unit charged with R-410A. What does that combination of sections allow on this job?
A fleet garage technician holds only the vehicle air conditioning certification issued under Section 609 and is asked to recover the charge from the shop's own rooftop air conditioner. What does that credential allow?
A split system's outdoor unit, indoor coil and the line set the installer ran and brazed between them are being considered. For the purposes of the refrigerant rules, what makes up the appliance here?
On a new installation the line set is brazed to a factory charged outdoor unit and an indoor coil shipped under a nitrogen holding charge, with the outdoor unit's service valves still closed. What does the recovery requirement call for before that brazing?
A rooftop unit's data plate has weathered until the charge figure cannot be read, and the technician needs the full charge to place the appliance under the evacuation and leak provisions. Where should that figure come from?
A computer room air conditioning unit holds forty pounds of R-407C and connects to a remote air cooled condenser through refrigerant piping run and brazed by the installer. How is that unit classified?
A shop's office manager, who holds no technician certification, is sent to a supply house to pick up a new recovery machine for the commercial crew. What does the sales restriction require at that counter?
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