Water is weeping from the joint where a chiller's waterbox cover bolts to the tube sheet. What kind of leak is that, and what does it require?
Correct Answer
C) A water side leak that is repaired without recovering the charge from the machine
The waterbox is on the chilled water side of the machine. Its cover gasket separates water from the outside of the tube sheet, not water from refrigerant, so a weep there loses water rather than refrigerant and the refrigerant circuit is never opened when the cover comes off. The water side is isolated and drained, the gasket is replaced and the box is refilled. None of the recovery or leak repair provisions is triggered by that work.
Why This Is the Correct Answer
The refrigerant circuit of a chiller ends at the tube sheet and the shell. A waterbox cover gasket is a water joint, so replacing it does not open the appliance and does not require recovery. Knowing where the refrigerant boundary lies is what tells a technician which jobs carry the refrigerant rules with them and which do not.
Why the Other Options Are Wrong
Option A: A refrigerant leak that has to be logged and repaired inside the period the rule allows
Nothing about a water weep involves refrigerant, so it does not enter the leak repair provisions or the owner's refrigerant records.
Option B: A refrigerant leak that requires the charge to be recovered before the cover comes off
The charge stays in the machine. Removing a waterbox cover exposes the tube ends and the water side, not the refrigerant space.
Option D: A water side leak that still requires the shell to be evacuated before the bolts are touched
Evacuating the shell for a water side gasket would be a day of unnecessary work and would put the charge into cylinders for no reason.
Memory Technique
Tube sheet is the border. Refrigerant on one side, water on the other, and the rules live on only one of them.
Reference Hint
Section 608 requirements attach to opening the refrigerant circuit; waterbox and water side work does not open it.
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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During normal operation, what condition exists inside the evaporator of a running low-pressure centrifugal chiller?
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