A liquid line sight glass on a recharged system includes a colored moisture indicating element. What does that element tell the technician about the system?
Correct Answer
A) Whether moisture remains in the circulating refrigerant and oil
The colored element in a sight glass changes shade according to the moisture content of the refrigerant passing over it, generally reading dry in one color and wet in another. It gives a running check that the evacuation and the filter drier actually got the water out, and it will change back toward dry over several hours as a new drier absorbs moisture. Bubbles in the same glass are a separate indication and say nothing about moisture.
Why This Is the Correct Answer
The indicating element is a moisture sensitive chemical that changes color with the water content of the refrigerant flowing past it. After a repair and recharge it is the quickest confirmation that the system is dry, and it is read after the system has run long enough for the refrigerant to circulate. A wet indication calls for another drier and often another evacuation.
Why the Other Options Are Wrong
Option B: Whether the refrigerant charge weight matches the nameplate value
The sight glass says nothing about charge weight. Bubbles suggest the liquid line is not full, but a clear glass can appear well before the charge is correct.
Option C: Whether the filter drier has reached the end of its service life
Drier life is judged by pressure drop across it and by the moisture indication itself, not by any marking on the indicating element.
Option D: Whether non-condensable gas has collected in the condenser
Non-condensables show up as high head pressure and a saturation temperature that does not match the condensing conditions, not in a sight glass.
Memory Technique
Color for water, bubbles for charge. The glass answers two questions and mixes them up for you if you let it.
Reference Hint
A moisture indicating sight glass reports the water content of the circulating refrigerant by color change.
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?
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