Low-Pressure Refrigeration Systems Flashcard

Front

Leak testing a low-pressure refrigeration system with nitrogen in excess of 10 psig could cause which component to fail?

Back

Rupture Disc

Front

What is the result of raising the temperature of the room in which a low-pressure chiller is located?

Back

Faster Refrigerant Recovery

Front

What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?

Back

Leak test and repair the chiller

Front

A rupture disc on a recovery vessel for low-pressure refrigerants relieves at:

Back

15 psig

Front

A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Which leak rate category is this chiller in?

Back

Industrial process refrigeration

Front

Methods to pressurize an R-123zd system for non-major repair: Adding R-22, Using compressed air, Adding nitrogen, Increasing room temperature.

Back

Adding nitrogen to the system

Front

What indicates air in a low-pressure system?

Back

High head pressure

Front

Why must water be circulated through a chiller during refrigerant evacuation?

Back

To prevent freezing of water in the appliance

Front

Charged low-pressure refrigeration machines may be most efficiently leak checked by:

Back

Adding heat with circulated hot water or heating blankets

Front

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

Back

When leaks in the appliance make evacuation to the prescribed level unattainable