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Electrical Theory & Applications for HVACR
©2012 ESCO Group
19.
When checking a condensing unit contactor, a technician finds 115 volts across the con‐
tacts when the coil is energized. The technician should:
A.
assume the contactor is ok
B.
replace the contactor
C.
clean the contacts with small file
D.
clean the contacts with solvent cleaner
20.
A condensing unit cycles on and off about every 5 to 8 seconds. Using a volt meter
while the unit is cycled off, a technician finds 24 volts across the low‐pressure switch
and 0 volts across the high‐pressure switch. The diagnosis should be:
A.
unit is cycling because of low pressure
B.
unit is cycling because of high pressure
C.
there is no problem with either switch
D.
the problem is not electrical