Where is the thermistor motor overload device usually positioned? Inside the motor windings.
Why the thermistor type sensor is normally embedded in the motor windings?
Explain why the thermistor type sensor is normally embedded in the motor windings? Because when the temperature of the motor sets to hot , It will break the electrical circuit to the motor and also saving it.
What type of control would be used to cycle compressors on and off in response to evaporator pressures that indirectly control box temperatures?
In refrigeration applications low-pressure controls are used to cycle compressors on and off in response to evaporator pressures that indirectly control box temperatures. High Pressure controls are used to keep compressors from operating with a high head pressure.
Which of the following is a switching device is commonly used to control the flow of power to a compressor?
A relay is a controlled switch that works by responding to an external signal. It is mainly used to control high-powered circuits. Both relays and contactors are electromagnetic switching components. Contactors usually operate at a higher control voltage and have an overload protection.
How is the cooling anticipator Normally wired to the cooling contact?
Normally, the cold anticipator is a high-resistance fixed resistor that is not adjustable in the field, Figure 14.9. It is wired in parallel with the mercury- bulb cooling contacts and is energized during the off cycle, Figure 14.10.
What are the three types of automatic controls?
Terms in this set (19) Name three types of automatic controls. Electrical, mechanical, and electro-mechanical.
How do you test a motor thermistor?
Heat the soldering iron. Heat the thermistor by moving your heated soldering iron tip to it. Note the multimeter reading as you are applying this heat. A properly functioning positive temperature coefficient thermistor will show a smooth and steady increase in the multimeter resistance reading.
What is the proper procedure for troubleshooting thermostats?
How to Troubleshoot a Thermostat
- Check the thermostat temperatures. There are two temperatures to take into consideration when dealing with a thermostat; set point temperature and room temperature. …
- Calibrate your room temperature. …
- Check the connections. …
- Take the thermostat out of the equation.
What temperature should I set my home thermostat?
What temperature should my house be? Or better yet, “What is the most energy saving temperature to set my thermostat at?” According to ENERGYSTAR.gov, the ideal home temperature should be in between 70 to 78 degrees Fahrenheit.
Which is true of a high pressure control?
What is true of a high-pressure control? It protects the compressor from high pressures. … A safety control (Boiler relief valve, or a pressure-regulating valve for system pressure), and an operating control (water regulating valve). 36.
What causes the overload of a starter to open and disable the power circuit?
What causes the overload of a starter to open and disable the power circuit? Heat caused by excess current (over amperage).
Are switches power passing or power consuming devices?
|power-consuming device||is considered the electrical load; example-in a lightbulb curcuit, the switch is a power-passing device that passes power to lightbulb that consumes the power and produces light|
What is the best method to repair a fractional horsepower motor that has bad bearings?
What is the best method to repair a fractional horsepower motor that has a bad bearing? Replace the entire motor. A technician needs to check a single-phase compressor.
What is the most important element of checking line voltage thermostats?
The most important element of checking line voltage thermostats is to be sure the contacts are closed in the correct temperature range. Once it has been determined that the thermostat should be opened or closed, it can be checked with an ohmmeter.
What is the easiest diagram to use to follow a circuit?
|Term Three reference points for checking temperature measuring instruments are…….||Definition 32F, 98.6F and 212F|
|Term A _____ is the easiest diagram to use to follow a circuit. this diagram normally can be studied briefly, and the circuit function should become obvious||Definition ladder diagram|