Heating Ventilating and Air Conditioning

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Neoma Donnelly

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1y ago
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Cards in this guide (19)
What is the purpose of a crankcase heater on a compressor

to prevent liquid refrigerant from staying in the compressor after shut down

What kind of head pressure would you experience if the condenser fan motor became inoperative

The compressor would continue to operate until the high pressure safety switch shut it down, if the switch failed the pressure relief device would blow and you would lose all of the refrigerant. As far as how high would the pressure get, the settings on the two devices depend on what type of refrigerant is used and you do not mention that.

What are the three letters on a compressor terminal block


Hole in your transition betweenfurnace an the evaporator will this cause the evaporator to freeze up

No,most likely your evaporator / filter is dirty or your system is low on freon.

Why is there a delay in restarting a compressor that has kicked off due to an internal overload

Sequencer is out of sequence

Is freon used for air conditioning

freon is just a brand name

What is the purpose of a squirrel cage

Squirrels run in them.

What color is the high side gauge

the color is red

How much should a HVAC capacitor cost

$132-$252, depending on size.

Speed control of motor using SCR

An SCR chip is commonly used to control the speed of a motor. The speed is controlled using an AC circuit and phase angles.

Purpose of Vibratory filter dryer for drying of crystal

advantages and disadvantages of plate heat exchangers

Why do you use a vacuum pump on an air conditioning unit

They are used when installing, to ensure there is no air or moisture in the pipework. On large industrial and commercial systems a sight glass may also be installed so the presence of moisture can be constantly checked for.

What is the evaporator coil

An evaporator coil is a vital part of any heating or cooling system. It is usually found in an air conditioner, because evaporator coils are particularly good at absorbing heat when air is passed through their system. Evaporator coils look like a series of pipes.

When charging vapor should be added to the side of the compressor


How many watts does a 5000 BTU AC unit typically use up

A 5000 btu AC unit operating at 25% efficiency operating continuously for 1 hour, will use approximately 5858 watts or 5.858 KW/h.

What is the common application for capacitors in electric motors

Start and run capacitors.

Need a cacuum emissions diagram hose routing for a 1978 Chevy nova 350 4 barrel

There should be a sticker located in the engine compartment that shows the emission related vacuum line routing.

What two copper lines connect the evaporator section with the condensing unit

suction line liquid line

What is a sequencer and where is used

A sequencer is a programmable electronic device for storing sequences of musical notes, chords, or rhythms and transmitting them to an electronic musical instrument. It would be used in a recording studio, on stage etc

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