What is the best thing to do before evacuating a refrigeration system?

a. Open the suction and close the discharge service valves to the refrigeration system.
b. Replace the oil in the vacuum pump to make sure it will pull a good vacuum.
c. Evacuate the gauge and pump connections to ensure all connections are tight.


c. Evacuate the gauge and pump connections to ensure all connections are tight.

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When moisture is present in a refrigeration system, it will react with the refrigerant and the oil to form ____.

A. carbon dioxide B. acid C. carbon monoxide D. carbolic acid

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Excessive debris at the bottom of the water garden is of no concern as long as the water is at least 2 feet deep and the debris is organic

Indicate whether the statement is true or false

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The amperage draw of an electric fuel pump is higher than specified. All of the following are possible causes EXCEPT ________

A) Defective fuel pump B) Restriction in the fuel line C) Clogged fuel filter D) Corroded electrical connections at the pump motor

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What is a gas pilot light?

A) a small flame that is used to light the main burners B) an LED that indicates the burner activity C) a light that allows the technician to see inside the furnace D) the first portion of the main burner that remains on at all times

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