A chiller is fitted with a factory pump-out unit and a storage tank, and the entire charge is now sitting in that tank. What still has to be done before the machine's waterbox covers come off?
Correct Answer
B) The chiller itself has to be pulled to the required level, because storing the charge on site changes nothing
Moving the charge from the shell into an onboard storage tank is a transfer, not the end of the job. Refrigerant vapor is still in the machine, more is still dissolved in the oil, and the required level is written for the appliance being opened. The pump-out unit gets the machine most of the way there quickly, but the last stretch is still made with recovery equipment and the reading is still taken at the shell before anyone breaks into it.
Why This Is the Correct Answer
The evacuation requirement attaches to the appliance that is about to be opened. A pump-out unit and storage tank move the bulk of the charge efficiently, but the shell has to reach twenty-five millimeters of mercury absolute before the refrigerant circuit is opened, because vapor and refrigerant coming out of the oil are still inside.
Why the Other Options Are Wrong
Option A: Nothing further is needed, because moving the charge into the plant's own tank satisfies the rule
Transferring the charge into an onboard tank is a useful head start, but it leaves vapor in the shell and refrigerant in the oil, so the required level has not been met.
Option C: The storage tank has to be pulled to the required level, because the charge is now the tank's contents
The storage tank is a container being filled, not the appliance being opened. Nothing requires a full tank to be pulled into a vacuum, and doing so would empty it.
Option D: The chiller has to be brought to zero gauge pressure, because the charge is no longer inside the shell
Zero gauge pressure is the very high-pressure appliance figure. A low-pressure machine at atmospheric pressure still holds a great deal of refrigerant vapor.
Memory Technique
The tank holds the charge; the shell holds the requirement.
Reference Hint
The required evacuation level applies to the appliance being opened, whatever container the charge has been moved into.
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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