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?
Correct Answer
A) Replacing the machine's compressor, condenser, evaporator or auxiliary heat exchanger
A major repair is defined by the components involved: removal of the compressor, the condenser, the evaporator or an auxiliary heat exchanger coil. That definition matters because the allowance that lets a technician stop at atmospheric pressure on an appliance too leaky to evacuate does not apply to major repairs. When one of these components comes off, the leaks have to be dealt with and the machine taken to the required level.
Why This Is the Correct Answer
The rule names four components, and swapping any of them makes the work a major repair: compressor, condenser, evaporator, auxiliary heat exchanger. The distinction exists so that the relief given to badly leaking appliances cannot be used on the largest jobs, where the machine is open longest and the potential release is greatest.
Why the Other Options Are Wrong
Option B: Replacing the machine's purge unit, oil pump, oil filter or refrigerant level sensor
These are accessories and controls. Replacing them opens the refrigerant circuit and requires recovery, but none of them is one of the four components that define a major repair.
Option C: Replacing the machine's rupture disc, service valves, gaskets or sight glass fittings
Rupture discs, valves and gaskets are routine parts. The work still requires the charge to be out, but it does not reach the major repair definition.
Option D: Replacing the machine's starter, motor bearings, control panel or vane actuator linkage
Starters, bearings and control components are outside the refrigerant circuit entirely, so this list does not even involve opening the machine in most cases.
Memory Technique
The big four are the ones you need a crane for. Compressor, condenser, evaporator, auxiliary heat exchanger.
Reference Hint
Major repair means removal of the compressor, condenser, evaporator or auxiliary heat exchanger coil.
More epa-608-type-3 Questions
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