An air-cooled chiller normally holds two hundred sixty pounds of R-22, and the only recovery machine available carries a manufacturer's date plate reading 1990. What level must the chiller be brought to before it is opened?
Correct Answer
B) Four inches of mercury vacuum
The evacuation table gives two columns, one for recovery equipment built before November 15, 1993 and one for equipment built on or after that date. A machine from 1990 falls in the earlier column, and the earlier column asks for four inches of mercury vacuum on an R-22 appliance that normally holds two hundred pounds or more. The later column would ask for ten inches on the same chiller. Older machines were not built to pull as deep, and the table reflects that.
Why This Is the Correct Answer
A 1990 recovery machine belongs to the pre-November 1993 column of the evacuation table. For an R-22 appliance whose normal charge is two hundred pounds or more, that column calls for four inches of mercury vacuum rather than the ten inches the later column requires. The older machine is still legal to own and use; it simply is held to the standard it was built to meet.
Why the Other Options Are Wrong
Option A: Zero inches of mercury vacuum
Zero inches is the level for R-22 appliances holding less than two hundred pounds. This chiller is above that line, so the shallow figure no longer applies.
Option C: Ten inches of mercury vacuum
Ten inches is what a machine built on or after November 15, 1993 would have to reach on this chiller. Reading the wrong column is exactly the error this question looks for.
Option D: Fifteen inches of mercury vacuum
Fifteen inches is the deepest high-pressure figure and it belongs to large charges of refrigerants other than R-22, with newer equipment.
Memory Technique
Old machine, small number. The pre-1993 column tops out at four inches no matter which high-pressure refrigerant is involved.
Reference Hint
Recovery equipment built before November 15, 1993, R-22 appliance of two hundred pounds or more: four 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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