CCNA1 v3 Module 9

v3v3A+

Type 3

JEOPARDY

K. Martin

CCNA1 v3 Module 9

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► ► ► F i n a l J e o p a r d y ◄ ◄ ◄

CCNA1 v3 Module 9

Question

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

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A: 10 psig. 100 100 100 100 100 100

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CCNA1 v3 Module 9

Question

A: Raising system pressure by heating with circulated hot water or heating blankets.

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

CCNA1 v3 Module 9

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CCNA1 v3 Module 9

Question

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A: Determine if a tube leaks.

A hydrostatic tube test kit will. . .

CCNA1 v3 Module 9

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Question

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A: Through a drain value.

Where would you place a leak detector probe to check gas leaks into the water box with water removed?

CCNA1 v3 Module 9

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CCNA1 v3 Module 9

Question

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A: 15%.

EPA regulations require that all appliances containing MORE than 50 pounds Of refrigerant (except for commercial and industrial process refrigeration) be repaired when the leak rate ____ percent of the charge per year.

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CCNA1 v3 Module 9

Question

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A: 35%.

EPA regulations require that leaking commercial and industrial process refrigeration be repaired when the leak rate exceeds ____ percent of the charge per year.

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CCNA1 v3 Module 9

Question

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A: Liquid removal.

R-11 or R-123 system refrigerant removal stars with. . .

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CCNA1 v3 Module 9

Question

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A: System operates below atmospheric pressure.

Why do chillers using CFC-11 and HCFC-123 require purge units?

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CCNA1 v3 Module 9

Question

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A: Less refrigerant will be contained in the oil at the higher temp.

When removing oil from a low pressure system, the temp. should be 130 degrees Fahrenheit because. . .

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CCNA1 v3 Module 9

Question

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A: What is ON?

During vapor removal from a low pressure refrigeration system the system water pumps, recovery compressor, and the recovery condenser should all be:

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CCNA1 v3 Module 9

Question

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A: Prevent freezing of the water.

Water must be circulated through a chiller during refrigerant evacuation in order to. . .

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CCNA1 v3 Module 9

Question

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A: System water to freeze.

Charging refrigerant liquid into a refrigeration system under a 29 in. Hg. vacuum can cause the. . .

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CCNA1 v3 Module 9

Question

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A: Refrigerant saturation temp. increases to 36 degrees Fahrenheit.

How do you determine when enough vapor has entered the refrigeration system before you charge refrigerant liquid?

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CCNA1 v3 Module 9

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A: Wait a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil.

After reaching the required recovery vacuum on an appliance, you should. . .

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CCNA1 v3 Module 9

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Question

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A: Replacement of an evaporator coil.

Which of the following repairs would always be considered “major” under EPA’s regulations?

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CCNA1 v3 Module 9

Question

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A: Leaks in the appliance make evacuation to the prescribed level unattainable.

Appliances need not be evacuated all the way to the prescribed level when. . .

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CCNA1 v3 Module 9

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A: Warming the refrigerant.

Under EPA’s regulations, which of the following methods can be used to pressurized on R-11 or R-123 system for a non-major repair?

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CCNA1 v3 Module 9

Question

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A: 25 inches of Hg. Vacuum.

When using recovery or recycling equipment manufactured BEFORE Nov. 15, 1993, technicians must evacuate low-pressure appliances to the following level before making a major repair.

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CCNA1 v3 Module 9

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A: 25 mm of Hg Absolute.

When using recovery or recycling equipment manufactured AFTER Nov. 15, 1993, technicians must evacuate low-pressure appliances to the following level before disposing of the appliance.

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CCNA1 v3 Module 9

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A: 100 lbs

Approximately how much refrigerant vapor is left in an average 35 or 350 ton R-11 chiller at 0psig pressure once all the R-11 liquid has been removed?

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CCNA1 v3 Module 9

Question

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A: Evaporator.

A centrifugal chiller rupture disk is connected to the chillers. . .

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CCNA1 v3 Module 9

Question

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A: Refrigerant leaks.

ASHRAE standard 15-1994 requires the use of room sensors and alarms to detect. . .

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CCNA1 v3 Module 9

Question

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A: 32 degrees Fahrenheit.

R-11 at a pressure of 18.1 inches Hg vacuum has saturation temperature of:

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A: All of the above.

Which of the following are safety precautions for low pressure system?

(Choices: Don’t siphon liquid refrigerant by mouth, Avoid spilling liquid refrigerant on the skin, Use gloves and safety goggles when working with liquid refrigerant)

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CCNA1 v3 Module 9

Question

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A: B1.

Under what code group of ASHRAE standard 34 does R-123 fall?

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