An oil burner equipped with the CAD cell relay will ignite, run for about ninety seconds, and cut off. What is the first thing the service technician should do?
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All of the following are true statements about receiver driers EXCEPT
A vac door actuator is being tested. When vac is applied with a pump the door does not move and the reading on the gauge is 0. Tech A says it is because the door is binding or obstructed. Tech B says the actuator is defective. Who's right ?
What is the minimum system pressure necessary to leak test with an electronic leak detector ?
To properly evacuate an AC system the vac pump should be run for:
All of the following are causes for fan clutch replacement except
2 techs are talking about sight glass observations. Tech A says that if foam is seen, the refrigerant charge is low. Tech B says that if oil streaks are seen in the sight class the refrigerant is low. Who is right?
Which of the following is a TRUE statement about R134a ?
. Oil lines can be constructed of _____, ______,______ pipe connected with malleable fittings.
During AC system operation a knocking sound can be heard coming from the compressor. Tech A says there can be internal compressor damage. Tech B says that the compressor mounting brackets and bushings should be checked. Who is right?
When Diagnosing an ATC system most of the system temp sensors can be tested for:
Oil burner nozzles are designed and rated at 100 psig nozzle pressure.
Tank piping should be inspected regularly for imperfections and leaks.
Latent heat of fusion
If a technician inspects the interior of a combustion chamber and finds large quantities of unburned oil, he would correctly conclude that ____.
why should a safty control not be adjusted if it has a seal to prevent tampering
What changes its resistance depending on the amount of light it senses
Which system provides makeup to the Laundry Water System?
shock or surge arrestor
A capacitor is a device that stores a quantity of ____________ .
What are three types of switching mechanisms used in low voltage thermostats
The __________ is an oil piping component that allows a one-pipe system to function as a two-pipe system.
Name two actions that can be obtained with a pressure change
Improper combustion can lead to ____.
Describe the purpose of the Plant Heating System, Central Chilled Water System and the Freeze Protection/Heat Trace System.
what component steps down the voltage to a low voltage value
Motors used in refrigeration systems may need as much as _________more current to start than to run at design speeds.
how can an electric thermometer be used in a well to obtain an accurate response?
What happens to the capacitance of a capacitor if the plate area is doubled, all other factors being equal?