How A Double Pole Contactor Replaces Single Pole Contactor HVAC Tip
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- เผยแพร่เมื่อ 3 ส.ค. 2021
- In this video, I show how to replace a single pole contactor to a double pole contactor. This comes in handy for many air-conditioning repairs. The single pole contactor and double pole contactor have a always hot side. The always hot side always has voltage for the loads. The low side of the contactor only sends power, to loads. When the contactor coil gets energized. Therefore oh you have to do is connect all of your always hot loads to the back end of the contactor the L one side. On the other side of the contactor most the time one leg of power is broken by the switch. You can break both legs a power for your compressor. As an HVAC tech this is an important tip in case you do not have a single pole contactor.
This is crazy lol, my trade school instructor was just explaining how some contractors have only one side that breaks while the other is continually hot. This video gave me great insight as to how it would be applied in a real world application. Earned a sub from me!
I have several vids on my other channel replacing single pole contactors with double poles on service calls. Gotta love how your spell check changed spelling of contactor. Mine always tells me it’s misspelled.
Good info for an electrical tech, who can understand the electrical lingo. Average DYI would not quite understand Line/Load references. But you did a GREAT job basically breaking down how to break/make a basic 240vac source. Good presentation.
Thanks Bill, I continue to learn from you daily !
Thanks for watching
Very good, basic electrical knowledge
They also use the connected thru side of contactor for trickle voltage for windings using cheap way as crank case heater.
Good info Hackster ... Thx for sharing ...
Congratulations...Adding a 2-pole unit creates an additional failure point since there are now 2 moving contact points instead of just one and if either one fails, there goes your A/C. To remove power completely to the unit, use the A/C disconnect which is what it's there for.
How does the capacitor store energy if the double pole cuts off power? Does it instantaneously get power when the contactor closes?
So, if it is in the summer, and the compressor heater isn't required. You can at minimum substitute a two pole with a single pole without any concern? Fan dosen't have to be hot?
hello my greeting well done
This helped me a ton. I sold a single pole and realized I was out on my truck but I have 7 2 pole contractors. About to do this on a Lennox lol
I heard Some manufacturers use constant power from single pole contactor to keep compressor oil warm.
Yes I did point that out on the two grayish black wires that go to crankcase heater
What about having available power to the capacitor, if the power isn't there then wouldn't there be a lag of current to the compressor using a double pole??
as soon as you open the Live wire contact the capacitor and other items connected to neutral are receiving no AC power.
Got your hair do for the camera? Lol Jk they did pretty good actually. My mom does hair too so go figure I pay attention to details as well lol good video I tend to do same thing here in Utah never ran through a single problem EVER PEOPLE so be grateful he’s even realizing free education!!
Can you just jumper a pole together on a double pole contactor and use it the same as a single pull?
Doing so would effectively make the double pole contactor act as a single pole, because you are only using one set of contacts. I prefer to have the entire circuit deenergized when not in use. No reason to send a 110vac (ground potential) to the compressor when it isn't in use.
Good vid. So with a single pole, what prevents the hot 120 leg from trying (unsuccessfully) to start the compressor? How does the compressor know to ignore 120 volts? Thank you.
Because you need both sides of the circuit to draw the electricity through the motor or whatever load you are powering…it’s the same reason why you could touch that one wire as long as you are not grounded…you need a ground or another pole to draw the electrons through the circuit
i always use a 2-pole contactor for safety reasons. (2 hot leads should have two contacts)
The best tutorial .
Thanks for sharing your knowledge blessing and more blessings to you and your family in Jesus name Amen ❤️🙏💪
The only people who understand what you’re saying is folks who understand electrical
Had a shady technician come out to diagnose our unit and he said bad contactor. He showed me by engaging the contactor so the compressor and fan would turn on. Compressor turns on but fan does not. Fan sounded like it was seized. He said once he replaces the contactor for $240 the fan would begin working again
Wouldn't it be much easier to simply say....take the output ("T") connections of the shunt (non-switched side) of your original single-pole contactor...and when you replace with a 2-pole contactor.....re-locate *those* wires to the incoming line connections? ("L" side) ?
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2 pole just means Live and Neutral both cut when contactor is open; surely the difference is one of safety?
No neutrals. Its 240v. each leg hot is 120v 120v
You only need to break one leg of power to shut off system. If something always needs to be energized, you can wire it on the hot side of the contactor/ line side.
What the hell is this! I should’ve watched this and asked my instructor to get us to wire that single pole.
Hope my vids help, useful info in many of my vids, on both my channels
@@howtohvac3234 For sure I see them in my feed and watch them from time to time
Even if it had a PSC fan motor you could still use a two pole .
Yes you can. Why I do in most my repair vids
You sound just like the hacker y’all must be related
Look like hacker, sound like hacker, cause I am The HVAC Hacker 👍
Just one critique about this video. Towards the end you call capacitor a compressor when talking about wiring. Otherwise good explanation. Thanks.
Yes the wire goes to capacitor. Yet it is for the compressor? Only herm on capacitor is in use. I thought I mentioned that in vid. Mabey I didn’t
@@howtohvac3234 I guess what I was trying to say is you pointed to capacitor and called it a compressor. Not a big deal.
Remember that the power is off during this video
Crankcase heater is wired wrong. It should be wired across the normally open contacts so that it shuts off during compressor operation (unless it’s shut off via a discharge line thermostat or ambient thermostat) While wiring a crankcase heater hot all the time works, it shortens the life of the heater (that most techs never check) which will most likely cause premature bearing failure of the compressor due to refrigerant condensing in the oil sump. As long as you are properly controlling your crankcase heater there is absolutely no reason why you can’t use a two pole instead of a single pole. If you are changing the crankcase heater to stay energized all the time you are an asshole. Send it dude. Screw the haters.
Their is a switch on the liquid line that controls crankcase heater. As you pointed out no reason to always energize. It’s useless when it’s not cool outside.
@@howtohvac3234 ten four. I never understood why manufacturers use an external thermostat to control a crankcase heater that is always going to shut off when the compressor is running yet pinch pennies on everything else haha. Wait until someone sees you throw a two pole contactor in a unit instead of a three pole in a pinch. Carrier does it every day in the factory 🤣
You mean it should be wired to normally closed contacts that open when the contactor pulls in to run the compressor.
@@RobertL78 no. I mean it should be wired across the normally open contacts on a single pole contactor. Google it.
I must be thinking of different controls then. Usually normally open contacts that I deal with are open when there is no power applied to the coil and the normally closed contacts are closed with no power to the coil.