CHS T2

If leaks in a system make the recovery to a required evacuation level unattainable or if reaching this level of evacuation would draw air into the recovered refrigerant, you are only required to recover down to a pressure of ________.

• A) 10 psig

• B) 5 psig

• C) 0 psig

• D) 5 inches of mercury

After buttoning up a system, the next step is to ________.

• A) pull a vacuum to leak check the system

• B) pressurize with nitrogen and leak check

• C) pressurize with oxygen and leak check

• D) charge the system to the nameplate charge and start the compressor

To avoid freezing the water in a water-cooled heat exchanger of an R-134a system, the unit should be initially charged with R-134a vapor to a pressure of at least about ________.

• A) 500 microns

• B) 5 psig

• C) 30 psig

• D) 100 psig

According to the EPA, it is a good idea to take an oil sample when ________.

• A) a new liquid-line filter drier is being installed

• B) there has been a compressor burnout

• C) cooling appears to be reduced

• D) the evaporator is icing

When beginning recovery, it is fastest to remove the refrigerant as a ________.

• A) vapor

• B) mixture

• C) liquid

• D) The state of the refrigerant does not affect the recovery rate

Which repair is ALWAYS considered "major system repair" under EPA's regulations?

• A) replacement of a condenser

• B) replacement of a capacitor

• C) replacement of a fan blade

• D) replacing a catalytic converter

The ________ is plumbed just downstream of the condenser.

• A) accumulator

• B) evaporator

• C) receiver

• D) compressor

If an owner of a system with a charge of 50 or more pounds decides to retire the unit and replace the unit with a new unit that uses a NON-EXEMPT refrigerant, the appliance owner has ________ to retire the appliance.

• A) 3 months

• B) 6 months

• C) 12 months

• D) 18 months

Before recovering refrigerant into an empty recovery tank, you must ________.

• A) test the refrigerant for acid

• B) purge the cylinder with nitrogen

• C) heat the cylinder

• D) evacuate the cylinder

To determine the system charge for leakage rate calculations, the EPA allows the use of calculations based on ________.

• A) compressor current draw

• B) power usage

• C) component and pipe sizes

• D) refrigeration or cooling capacity