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

a. Replace the oil in the vacuum pump to make sure it will pull a good vacuum.
b. Open the suction and close the discharge service valves to the refrigeration system.
c. Pull a vacuum on the gauge and pump connections to make sure they are not leaking.


c. Pull a vacuum on the gauge and pump connections to make sure they are not leaking.

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What may be required when installing a split-system heat pump outdoor unit on an exposed rooftop

a. An extra crankcase heater b. A snow stand c. A wind baffle d. More vapor line insulation

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Easily decayed materials, like starch, are said to be ____________________

Fill in the blank(s) with the appropriate word(s).

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The maximum current for a LOW output on a standard TTL gate is

A) 100 ?A. B) 16 ?A. C) 40 mA. D) 16 mA.

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The heating element is designed to warm the seat and/or back of the seat to about ____________

A) 50° F (10°C) B) 70°F (21°C) C) 90°F (32°C) D) 100°F (38°C)

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