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 4-5 The wiring to a storage sensor is shorted out. What will happen?
a)
The
pump
will run all the time
b)
The
pump
will run only at night
c)
The
pump
will never run
d)
The
pump
will run normally
4-6 A storage high limit of 160 degrees is desired for a 10K c o n t r o l . W h a t
resistance should be used to "impersonate" this temperature?
a)
13,500 ohms
b)
10,000 ohms
c)
1,700 ohms
d)
1,170 ohms
4-7 Which is the most accurate and useful dial or readout when testing controls
and sensors?
a)
Resistor color code
b)
Analog ohmmeter
c)
Control tester dial
d)
Control digital readout
4-8 Which of these is a symptom of an airbound collector loop in a closed-loop
system?
a)
The collector feed temperature is greater than the return temperature
b)
The collector feed and return temperatures are the same
c)
Erratic control operation
d)
The pump's current draw is much too low
4-9 A piping loop has no apparent flow, but the pump's current draw is correct.
What is the most likely problem?
a)
Tripped circuit breaker
b)
Worn pump bearings
c)
Closed valve in loop
d)
Locked pump rotor
TROUBLESHOOTING
134
4.4 QUESTIONS FOR SELF-STUDY
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