A parallel rack normally holds three hundred fifty pounds of R-22, and the recovery machine being used on it was manufactured in 2005. How deep must the rack be pulled before the receiver is unbolted?
Correct Answer
C) To ten inches of mercury vacuum
Once an R-22 appliance normally holds two hundred pounds or more, it moves off the shallow line of the evacuation table and onto a line that is split by the age of the recovery equipment. Equipment built on or after November 15, 1993 has to bring that appliance to ten inches of mercury vacuum. A machine from 2005 sits in that later column, so the rack has to come down to ten inches before any part of the circuit is opened.
Why This Is the Correct Answer
Charge size is what moves this rack off the shallow R-22 line. An R-22 appliance with a normal charge of two hundred pounds or more must reach ten inches of mercury vacuum when the recovery equipment was built on or after November 15, 1993. A 2005 machine is well inside that column, so ten inches is the number the technician has to see before the receiver comes off.
Why the Other Options Are Wrong
Option A: To zero inches of mercury vacuum
Zero inches is the figure for R-22 appliances under two hundred pounds. Carrying that number up to a three hundred fifty pound rack leaves a large amount of refrigerant in the circuit.
Option B: To four inches of mercury vacuum
Four inches of mercury vacuum is what the older column allows for this same appliance. The machine here was built well after the cutoff, so the shallower figure does not apply.
Option D: To fifteen inches of mercury vacuum
Fifteen inches belongs to the largest charges of the other high-pressure refrigerants, not to R-22. Mixing the two families is the usual way this row is missed.
Memory Technique
Big rack, double digits. Once the charge crosses two hundred pounds, so does the vacuum requirement, from zero to ten.
Reference Hint
R-22, two hundred pounds or more, 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?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass
Related Study Resources
Previous Question
Recovery has stalled because pressure in the recovery cylinder has climbed until the machine can no longer push refrigerant into it. What is the correct way to get the transfer moving again?
Next Question
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?