To avoid the creation of oxides in the refrigeration lines of mini-split systems, the lines are ...

To avoid the creation of oxides in the refrigeration lines of mini-split systems, the lines are assembled:

A) Using Reflok fittings.
B) Using standard flare fittings.
C) By brazing the connections while flowing nitrogen through the lines.
D) Using heavy-walled flare fittings.

[Ques. 2] What causes the little pops and ticking that can be heard in some furnaces before the blower comes on?

A) Small quantities of water in the gas
B) Mechanical rattles from an unbalanced indoor blower
C) Small concentrated pockets of gas that explode
D) Expansion of the heat exchanger as it heats up

[Ques. 3] The grades of fuel oil are 1 through 6 with:

A) 6 being the lightest and most distilled and having the highest heating capacity.
B) 1 being the lightest and most distilled and having the highest heating capacity.
C) 1 being the lightest and most distilled and having the lowest heating capacity.
D) 6 being the lightest and most distilled and having the lowest heating capacity.

[Ques. 4] A device that moves a device such as a valve or damper is called:

A) An actuator. B) A sensor. C) A switch. D) A sending unit.

[Ques. 5] Of the four phases listed, which one is performed before the others?

A) Electrical connection B) Piping installation
C) Evacuation and charging D) Start and check

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To avoid the creation of oxides in the refrigeration lines of mini-split systems, the lines are ...

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