EPA 608 Exam Study Type III

ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect?

• A1 refrigerants

• B2 refrigerants

• A2 refrigerant

• all refrigerant safety groups

Which of the following statements is true of recycling and recovery equipment?

• it must be tested by an AHRI-approved third party

• it must be equipped with low loss ball valves and flare fittings

• it must be able to handle more than one refrigerant

• it must be labeled as certified to meet EPA's requirements.

Which of the following methods can be used to pressurize an R-1233zd system for the purpose of opening the system for a non-major repair?

• adding nitrogen to the system

• warming the liquid refrigerant in the system

• adding compressed air to the system's condenser

• adding carbon dioxide to the system's condenser and evaporator

When should an appliance NOT be evacuated all the way to the prescribed level?

• when performing a major repair followed by a minor repair

• when the repair is followed by an evacuation of the appliance to the environment

• when leaks in the appliance make evacuation to the prescribed level unattainable

• when the appliance is being disposed of

What must be done after recovering the liquid refrigerant from a low-pressure chiller?

• recover the vapor refrigerant

• pressurize the system with nitrogen

• separate the oil from the system

• solvent flush the entire system

What should you do after reaching the required recovery vacuum on a low-pressure appliance?

• immediately disconnect the recycling or recovery equipment and open the system for service

• wait for at least a few minutes to see if the system pressure rises before charging

• break the vacuum with nitrogen and open the system for service to begin charging liquid

• pressurize the system with nitrogen and perform a leak check

R-123 at 14.7 PSIA will boil at approximately?

• 90°F

• 82°F

• 78°F

• 74°F

Approximately how much refrigerant vapor is left in an average 350-ton R-123 chiller at 0 PSIG once all the R-123 liquid has been removed?

• trace amount

• 50 lbs

• 75 lbs

• 100 lbs

When leak testing a low pressure centrifugal with nitrogen, what is the maximum test pressure?

• 0 PSIG

• 10 PSIG

• 25 PSIG

• 50 PSIG

What is the primary purpose of a purge unit on a low-pressure chiller?

• remove refrigerant from the system

• condense air out of the system

• condense water out of the system

• remove non-condensables from the system