Some High Voltage Electrical Basics

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 29 November 2016

⏱️ 66 minutes

🔗️ Recording | iTunes | RSS

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Summary

This podcast is a high voltage A/C electrical class that Bryan gave to some of the Kalos apprentices.

The high voltage journey begins with basic electrical theory. Basically, a difference in charge is needed for electrons to move and generate power.

Motors, which are inductive loads, are the greatest users of power that we will encounter in the field. Inductive loads generate magnetism and utilize alternating current (AC) power. AC power is generated by a rotating magnetic field, and the direction of the current alternates. Comparatively, resistive loads generate light and heat, and direct current (DC) moves in one direction. Theoretically, we can use Ohm's law in the field to determine the voltage, amps, or resistance (ohms) without a meter, so long as we know two of the three values. However, we may not get an accurate measurement of ohms due to reactance on inductive loads.

The windings you will encounter in the field include common, start, and run. (Remember: the same side that feeds start feeds run.) In a PSC motor, the start winding stays in the circuit the entire time. When you ohm the windings, you will notice that common has the lowest resistance, run has moderate resistance, and start has high resistance. (Common to run + common to start = run to start). Universally, capacitors contain a brown, black, white, and brown-and-white wire. You can wire a capacitor in two different ways; one uses three wires, and the other uses four. The three-wire method caps off the brown-and-white wire, leaving it unused.

Join Bryan and the apprentices in their high voltage class as they cover:

Basic Electrical Theory
Potential Difference
Basic Capacitance
Motor Lead identification
Different motor type
Motor Direction
Proper Wiring
MOCP and MCA

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Transcript

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0:00.0	This episode of HVAC School is sponsored by HVAC-HAC-HAC-HAC-HAC-HAC-HAC.
0:10.0	Reminding you, don't be a hack. And also just want to clarify what I mean by this
0:17.1	episode sponsored by HVAC-HACs. Ralph Harmon who's the guy behind HVAC Hacks, he was kind enough to actually have this
0:26.4	podcast on his site, HVAC-HAC.
0:29.1	So if you go there to HVAC-HACs, you will our podcast there and I really appreciate Ralph and there's some pretty
0:35.9	interesting stuff on H-VAC hacks if you like seeing the dark side of the HVAC industry and what not to do. Well, sir, if you wouldn't mind coming outside, I've got some bad news for you here.
0:59.2	You can see that the pilot tube here on your reversing valve is it's cracked right where it goes into the
1:04.6	valve body so I think we're going to have to replace this reversing valve.
1:08.3	I know more about this reversing valve than the technicians do believe me., I don't see how that's possible, but I mean it's either replace the valve or you have to replace the equipment.
1:19.0	We are going to replace the equipment.
1:21.0	All right, but...
1:22.0	We are going to have better condensers. the do that though I would also recommend replacing your duct work it's pretty
1:33.5	undersized. You're going to build that duct system and carrier is going to pay for it.
1:38.6	And now for the guy who sheds a tear and whispers,
1:43.5	Freon ain't free, every time he finds a leaking braise joint
1:47.3	on a warranty call.
1:48.5	Brian Orr. Yeah, my gash show, you ain't kidding. With the cost of a tank of R22, like, I don't know what it is now, it's a lot, it's like $800 around here.
2:04.5	Of course I shed a tear, it's ridiculous.
2:07.2	Whenever one of my employees leaves a leak in a system that we just installed or a compressor
2:12.3	or whatever, not that that ever happens with the stellar team here at Kalo Services in Central Florida, providing quality service to all of our customers.
2:20.0	Anyway, I am Brian, thank you Joel for that intro. And today I'm just going to play almost in its entirety. There's a little bit of editing, but this is a class that I gave to some of our apprentices a few weeks ago about high voltage electrical circuits. It's a very meandering
2:36.3	class and obviously you don't have the benefit of the visuals but stick in there because I think I still
	...

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