Refrigerant Charging

Charging a refrigeration system refers to ____.

• removing refrigerant from a system

• adding refrigerant to a system

• cleaning the refrigerant

• vaporizing the refrigerant

Refrigerant in vapor form is normally put into the system through the ____.

• liquid line

• suction line

• hot gas line

• liquid return line

When charging a system with vapor refrigerant from a refrigerant cylinder, the cylinder will become ____.

• colder

• hot

• the same temperature as the ambient air

• warm

Refrigerant in liquid form is normally put into the system through the ____.

• liquid line

• suction line

• hot gas line

• liquid return line

When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed

• upside down

• right side up

• on its side

• in any position

If 22 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 24 lb. 12 oz. before any is added, what will be the supply cylinder weight after the system has been charged?

• 22 lb. 12 oz.

• 22 lb. 10 oz.

• 22 lb. 8 oz.

• 23 lb. 6 oz.

If 30 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged?

• 22 lb. 8 oz.

• 24 lb. 6 oz.

• 24 lb. 8 oz.

• 22 lb. 4 oz.

If a critically charged refrigeration system is over charged, which of the following is a likely result?

• increased cooling capacity

• reduced compressor discharge temperature

• increased system efficiency

• increased operating pressures

Fractionation occurs when ____.

• some of a blended refrigerant evaporates or condenses before the rest of the blend

• when only a fraction of the total charge has been added to a system

• the operating pressures of a system increase

• both a and c

When vapor charging a refrigeration system with a near-azeotropic mixture, what must be done to prevent liquid from entering the system?

• Charge only as a vapor through the high side.

• Charge only liquid through the high side.

• Charge as a liquid through the low side using a restrictor.

• Charge as a vapor through the low side using a resistor.