Why is nitrogen used to purge the system before using the flushing solvent?
A) The flush is activated by the presence of nitrogen.
B) Nitrogen is more effective.
C) Nitrogen is cheaper.
D) Nitrogen will blow open the clogs.
C
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Conductance testers are used to test all of the following EXCEPT_________.
A. current flow B. batteries C. starters D. generator output
What prevents compressed refrigerant from traveling back into the compressor when the piston in on its suction stroke?
A. Solenoid valve B. Throttling valve C. Discharge valve plate D. Suction reed valve
Automatic pump-down systems are equipped with a ____________________ to prevent refrigerant from reaching the evaporator.
Fill in the blank(s) with the appropriate word(s).
A(n) ____________________ switch is used to control a 240-volt load from one location.
Fill in the blank(s) with the appropriate word(s).