HVAC ohming control transformers and contactors

I demonstrate how to ohm control transformers and contactors.

Category:

Howto & Style

Tags:

• DrZarkloff
• Starkloff
• HVAC/R
• betterthanbob
• air
• conditioning
• HVAC
• ohm
• transformer
• contactor

[MrAndrew43]

LOL, it's good to know im not the only one who salvages parts.

[DrZarkloff]

@MrAndrew43 I work for the school board so it saves money to salvage parts.

[ADUBOIS11]

what if your common wire is also the other side of the power to the air handler ? My airhandler is set up like this. One black wire 110v and one common wire 110v and one ground wire. Do I still hook up the common to the white terminal block having 110v?

[DrZarkloff]

@ADUBOIS11 I'd have to see your system to make a decision on that one.

[demented12]

Do you have the schematics for this transformer installation?

Normally they come with only 4 wires,but I haven't been able to set up this one that has 6 wires an different colors.

[DrZarkloff]

@demented12 The schematics should be printed on the transformer. A 6 wire transformer isn't all that difficult to set up after you see it done once. Two of the wires are going to be for the 24 volts. The other four wires are a multi-volt tap. You'll have one common wire. The other three wires are marked for 120V, 240V and the last wire is going to be for 208V or 460V.

[MrAndrew43]

@DrZarkloff LOL, yeah, I hear ya bud. I keep some stuff for those cold or hot nights when everything is closed and you just gotta get it up and running. I dont like using used parts at all, but ya do what you gotta do. I enjoy your vidios by the way. Ive logged going on 24 years now and im learning all the time.

[MrAndrew43]

@ADUBOIS11 If I understand, you have either a 240 volt, or a 115 volt transfomer. Just remember your common if it's a 230 volt is just gonna be one side of the 115 you have comming in. It doesnt matter as long as you have 230 to the trans. Now, if there are other wires comming off the same place you have to keep everything in line. If you have a 115 transformer, your common will go to a ground, and you will have your 115 volt going to a 115 volt power suply. I hope I didnt confuse you more. lol

[demented12]

@DrZarkloff ,Thank you for the quick response,after a while we figured out,have a nice day and thank you again.

[MrGurudude5]

can i test my hvac unit with a multimeter? and if so can you tell me how!