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Exam 10: System Charging

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Question 1

Multiple Choice

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

A) liquid line
B) suction line
C) hot gas line
D) liquid return line

E) B) and D)
F) None of the above

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Question 2

Multiple Choice

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

A) Charge only as a vapor through the high side.
B) Charge only liquid through the high side.
C) Charge as a liquid through the low side using a restrictor.
D) Charge as a vapor through the low side using a resistor.

E) All of the above
F) B) and C)

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C

Question 3

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When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.

One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the technician how much refrigerant was used.

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?

The ____________________ is used to help technicians perform a number of tasks including taking pressure readings on the high side of the system and trapping all of the system refrigerant in the receiver to perform system service.

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

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

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

The quickest method to charge a system is to charge only vapor.

Charging a refrigeration system refers to ____.

Refrigerant in vapor form is added to an operating system through the ____________________ side of the system.

When the warm refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ____________________ than the suction pressure of the system.

The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ____________________.

A manufacturer's charging chart may be used when available to determine the correct charge for a system.

Fractionation occurs when ____.

When adding refrigerant in liquid form into the high-side of the system, the system motor/compressor assembly is running.

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

Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.

The factory charge in a split system, using R-22, shows 6 lb. 8 oz. in the outdoor condensing unit and 2 oz. in the evaporator. The 3/8" liquid line contains 0.48 oz. per foot and the 7/8" suction line contains 0.10 oz. per foot. The refrigerant lines are 30' long. What is the correct refrigerant charge for this system?