Electric Motors
Troubleshooting Controls
System Evacuation
System Recovery
EPA 608
100
how do we check a motor for open or shorted windings
Voltmeter
100
what instrument do you use to check out controls
Volt / Ohmmeter
100
oily dust spots on condenser or a evaporator indicates
What is a refrigerant leak
100
which refrigerant has a 0DP
What is HFC
100
Ozone in the Stratosphere above the earth contains
What is 3 oxygen atoms
200
a decrease in motor resistance will cause amps to
Increase
200
what is the first thing you should do when working on a compressor circuit
What is turn off unit disconnect main power
200
how many microns in one inch
What is 25,400 microns
200
which refrigerant has the highest ODP
What is CFC
200
What is temperature glide
What is the pressure vs temperature curve of the blended refrigerant
300
What may happen to the electric motor if the drive belt is too tight
bearings will wear out prematurely
300
a diagram used to locate different components on a diagram in the unit is
What is a pictorial diragram
300
the only two products that should be circulating in a refrigeration system is
What is refrigerant and oil
300
any time a system is opened to the atmosphere what must always be done
What is evacuate the system to 500 microns
300
what is likely to result of heating a recovery cylinder with open flames
What is venting of refrigerant to atmosphere or tank explosion
400
in a 3 phase motor in good working condition the the winding resistance
should be the same across all 3 windings
400
To trace down the circuits in the unit which diagram is used
What is Ladder or Line schematic
400
what is todays most accurate deep vacuum gauge
What is Micron Gauge
400
why should oxygen or compressed air never be used to pressurize a system
What is oxygen and oil will become unstable and explode under pressure
400
what is the result of unbrazing a refrigerant line if it is not completely empty of gas
What is fosgene gas a toxic gas
500
a loose connection may result in
Lower voltage and higher ampers
500
The hot circuit in thermostat is the
What is R or Red Terminal
500
why is it important to change oil in the vacuum pump
What is to get rid of moisture and contaminants in the used oil so deeper vacuums can be achieved
500
the manufacture requires that all systems be evacuated to
What is 500 microns
500
what component is always replaced after a system is opened for service
What is filter driers are always replaced after a system repair
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