A technician remembers that the evacuation table splits appliances at a two hundred pound charge. How does that split apply to a chiller holding one hundred and fifty pounds of R-123?
Correct Answer
B) It does not apply, because the split is written for high-pressure appliances rather than chillers
The two hundred pound division in the evacuation table separates smaller high-pressure appliances from larger ones, and it comes with different required levels for each. The low-pressure row has no such division. Every low-pressure appliance goes to the same figure regardless of whether it holds one hundred and fifty pounds or two thousand. Carrying the two hundred pound split across into Type III work is one of the classic ways a high-pressure technician misreads the table.
Why This Is the Correct Answer
Charge size changes the required level only for high-pressure appliances. A low-pressure appliance is defined by the refrigerant it uses, and the table gives that class a single required level with no size division and no manufacture date division. The one hundred and fifty pound chiller and a two thousand pound chiller are pulled to exactly the same absolute pressure.
Why the Other Options Are Wrong
Option A: It applies, so the machine may be stopped at the shallower of two low-pressure levels
There is only one low-pressure level in the table, so there is no shallower option for a smaller machine to fall back on.
Option C: It applies, so the machine has to be taken deeper than a larger low-pressure machine would be
This inverts the high-pressure logic and applies it to a class that has no size division at all. Machine size does not move the low-pressure figure in either direction.
Option D: It does not apply, because the split covers only appliances built before nineteen ninety-three
The manufacture date split is a separate feature of the table and it is not what the two hundred pound division describes. Neither one reaches the low-pressure row.
Memory Technique
Two hundred pounds is a high-pressure story. Chillers get one number, whatever they weigh.
Reference Hint
The two hundred pound division in the evacuation table applies to high-pressure appliances; low-pressure appliances have a single required level.
More epa-608-type-3 Questions
Some jobs on a chiller count as a major repair under the refrigerant rules, which changes what a technician is allowed to do with a badly leaking machine. Which job falls into that category?
An owner asks how many pounds of refrigerant the rules allow to be left inside a chiller once the recovery has been signed off. What is the correct answer to give him?
The motor of a hermetic centrifugal chiller sits inside the pressure boundary rather than outside it on a shaft. What follows from that construction?
An oxygen monitor is used to decide whether a chiller machine room is safe to enter after a refrigerant release. Below what oxygen reading is the atmosphere treated as oxygen deficient?
A low-pressure chiller's rupture disc has a discharge line running from it. Where does that line have to terminate?
A refrigerant vapor detector in a chiller machine room reaches its alarm level. Besides sounding, what is that alarm expected to do?
Which piece of equipment requires a technician to hold Type III certification before it may be serviced?
What property of the refrigerant is what actually places an appliance into the low-pressure category?
During normal operation, what condition exists inside the evaporator of a running low-pressure centrifugal chiller?
In what unit is the required final recovery vacuum for a low-pressure appliance normally expressed?
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