Test 3 Flashcards
If you are recovering refrigerant from a frost-free refrigerator, you should
turn on the defrost heater to vaporize any trapped liquid.
When checking for the existence of nondensable gases inside a recovery cylinder, why is it proper procedure to allow the temperature of the cylinder to stabilize at room temperature before taking a pressure reading?
Because any comparisins to a pressure-temperature chart is only valid if both the pressure and temperature of the refrigerant are stable.
Whenever nitrogen is used to pressurize or blow debris out of a system, the nitrogen
can be vented.
If a reclamation processing plant is given a recovery tank containing a mixture of refrigerants, they can
refuse to process the refrigerant and return it.
agree to destroy the refrigerant, but typically a substantial fee is charged for this.
resell the refrigerant for reuse in its current state.
answer Both A and B
Refrigerant recovery devices must be equipped with low-loss fittings. Low-loss fittings are used to
connect the recovery device to an appliance and are manually or automatically closed to prevent refrigerant loss when connecting/disconnecting hoses.
Recovery or recycling equipment which was manufactured after November 1 1993, and is used to recover refrigerant from small appliances must be used to
recover 95 percent of the refrigerant from the appliance whether or not the compressor is functional.
recover 80 percent of the refrigerant from the appliance if the appliance compressor is inoperable.
recover 90 percent of the refrigerant from the appliance if the appliance compressor is operational.
Answer Both B and C.
The sale of refrigerants is
restricted to technicians who are EPA certified in refrigerant recovery.
A recovery cylinder which is half full of recovered R-410a at 90F, in the absense of noncondensables, will be pressurized to
300 psig
Which refrigerants can be mixed?
Refrigerants can never be mixed.
When transporting refrigerants, DOT (Department of Transportation) Regulation number 49 CFR requires _________ to be recorded on the shipping papers for hazard class 2.2, Nonflammable Compressed Gases.
Number of cylinders of each gas.
If a large leak of refrigerant occurs in an enclosed area and no self-contained breathing appa
Vacate and ventilate the area
When recovering refrigerant from a household refrigerator where the compressor does not run, it is recommended that low side and high side access valves be installed because ___________.
it can enhance the speed of recovery.
it may be necessary in order to achieve required recovery efficiency.
otherwise the refrigerator compressor may be damaged.
answer Both A and B
A recovery cylinder which is half full of R-12 at normal room temperature, about 75F, in the absence of non-condensibles, will be pressurized to
75 psig
When using nitrogen, the nitrogen tank should always be equipped with a
regulator
To avoid accidental removal of liquid refrigerant when recovering vapor from a system, using a self-contained (active) recovery device that cannot handle liquid refrigerant, you should draw vapor from the
High side
If you install an access fitting on to a sealed system,
the fitting should be leak tested before proceeding with recovery.
