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I added a 3a fuse to my power supply (40VA) and attached two spade terminals to the hot wire of the 24v side. Works great now I feel that I protected my board better. Older system, 1999 no fuses!! THANKS Great vids by the way.
Wow it’s amazing how much I learn in such a short vid. I’m about to replace a broken transformer in my air handler. This give me the knowledge and confidence. Thanks!
@@obrianthinline8514 changed mine burnt it too. Learned to put a 3amp fuse. Changed sequencer,coil relay, limit switches. After several blown fuses found it was my thermostat!!
This was very helpful for me to troubleshoot and confirm that I had wired a new, but faulty transformer correctly. Thank you very much for the simplification and straightforward tutorial!
I live in Savannah GA and my transformer died… I know!!! There are a few places I could get a new but it was after hours and they were all closed. So on a whim, I checked continuity on the primary winding between C and 230 and got nothing, however there WAS continuity between C and 208. You see where I’m going with this? I put the transformer back in the air handler, reconnected the low side and connect the high side to the C - 208 tabs. Turned on the juice, no smoke, all is good. As of the time that I am typing this, it’s been running for about 3 hours (it got up to 79 inside). Everything opens up around 7am, hopefully we make it!
Can you do a video SHOWING how to wire a transformer exactly. Like breaking a leg off high voltage etc? Your videos help me in my hvac career & I had a hard time wiring a aprilaire ventilator yesterday when it came to wiring the damper motor to the transformer. Thanks brotha
I have a question about the 240v hookup Transformer.. you said the rightway to hook up to hook up orange wire one pole that 120v of the 240v and the white wire ..do you hookup the white to the com or the other 120v line please let me know.. thank you.. if you answer that for me.
@@Aureliskon a 240v circuit (one ground wire two hot wires) you wire the black line wire to orange 240v wire and the white line wire to white com wire.
Hello Craig. Can you comment about some transformers that ground one leg of the secondary to the cabinet ? Often when you look at voltage of each secondary leg to cabinet, you get R at 16 volts and C at 8 volts.
How do you determine what size transformer to use and what size fuse to use? I am trying to add some relays to my system and I cannot find out what their coil power draw is and determine if the transformer will work.
I have a bad transformer, it's a 230 volt but the one they sold me is just like the one you have in your video. Do I wire it as the 240? White and orange?
Hi came across your video, can i use this transformer to step down a 120 volt thermostat on my boiler. Im looking to put in a nest thermostat, and was wondering if this could work for me, so i can get rid of the old 120v and put in a 24 volt wifi enabled nest thermostat. Would you happen to have a wiring diagram for this to be done, on a heat only system with an aquastat relay.
I’m late but would this work on a irrigation 2 wire system and if so what wires would I use and what wire could I put a fuse on the 115v side to prevent overload
Swamp cooler with 3 power for motor. Contractor, switch, and transformer wired in. Switch will not shut off. (Dual phase 240). 2 sides provide 120 each. Switch shuts off line 1. No common available. Is the transformer of a correct type?
Hi where does the Neutral wire go? i disconnected a broken transformer with out looking at what i was doing, it seemed pretty straight forward. Now i cant figure out where to connect the white wire. the power entering is 2 phases entering the unit but no Nuetral. What do you think i could do? Thank you in advance for your help.
So if I have 2 120 volt wires no neutral no ground for a 240 volt wall heater in how do I wire transformer to come down to 120 for new 120 wall heaters. I really appreciate your help..
I have a 120/208v line voltage system with red, black, and ground wires connected (with two red wires behind my current thermostat wire nutted together for whatever reason). Will this work to power a Nest Thermostat properly? Do i still need a C wire aka their Nest Connector?
Mr Craig I have a question,3 months ago I changed a burnt control board since then I can hear what I think is the transformer humming, could this be a signal of any problem, thank you and your videos are number one on hvac teaching keep the good work
Only time they have ever buzzed for me is when I tied the wrong wire In for common. Like if you put the 120v lead and the 240v lead into the contactor or on the board the transformer buzzes then pops after a few Mins.
Nice video. For educacional purposes help me understand this. I have a 120/24v transformer. On the secondary side From terminal labeled 24vac to ground I read 17volts ans From terminal labeled 10VA to ground I read 16Volts. I read 24v across these 24v and 10VA terminals. How do I determine which one of these two wires is the 24V hot? I was expecting to see 0v from one of these legs to ground.
omg, smartest presenter.... are you around right now?? lol.... Cz I need u! before I burn down the house or eletrocute myself, lol.... Tuesday, February 12 2019, 12 noon MDST(Alberta)
I have 3 wires on my secondary. Hammond part # 166L25 Green , Green/yellow, Green Is the Green/Yellow common? They gave me two secondaries? Could I not have just run an extra wire to a single secondary to run my two items?
It's considered unsafe to connect more than one wire to each terminal of a breaker. It's better to connect the source wire from the breaker with the load wires to the 2 transformers using wire nuts.. I do see that it's been 2yrs, but still hope this helps.
We put the fuse on the 24v red wire coming out of the transformer. You could use just plastic coated spade connectors and a 3 amp spade fuse. The high voltage side has the disconnect switch outside of the unit and the breaker inside the breaker box to protect to high voltage side, thanks Daniel!
How hot should one of these transformers get on 120v with no load? I have one this same model that when sitting on a desk with nothing but 120v connected to white/black gets too hot to hold on to after a few hours, and another one of the same type but different brand that I just bought that isn't a whole lot cooler. Thanks. (tmi: Using for project box overkill thermostat builds with a thermostat module and contactor switching an outlet for a window a/c or space heater, because thermostats in those things fail far too often nowadays. I currently have a window unit with a failed digital thermostat that's rewired to always on, and another newish one with a regular thermostat that sometimes needs the knob cranked around a few times before it'll kick off again. And space heaters trend towards completely random on a good day...)
I just changed the Transformer on a 240v air handler I'm getting 124v to one leg and 116 V to the other leg of incoming power. But not getting 24v out of the Transformer even after changing the Transformer, would you think the 1 high voltage leg being only 116v would cause the new Transformer to not put out 24v? I tried putting in two different Transformers and still not getting any 24 volts out
Can you explain how the common on the primary is different from the common of the secondary side. For example on a 480v transformer, they label use black-common and Gray for 480.
Electromagnetic induction allows current to pass from one coil of wire to another coil of wire that actually are not touching but wrapped around the same iron core. I would look up electromagnetic induction or how a transformer works, thanks
I have two electric baseboard heaters producing 16 Amps currently connected to a double pole 22A-120/240 Vac(18A-277VAC res. only) thermostat. Can I use this same contactor to connect on a 24V wifi thermostat?
I have a bad transformer on a air handler and it only has 2 wires hooked up to the hot side of the low voltage and nothing on the common side. I bought a new transformer that has wires on the low voltage side. what does the common wire go to ?
On the low voltage side on the wiring diagram, it may have the 24v common connecting to the ground chassis but you would need to verify by following the wiring diagram, thanks
Hello, I have a same part# transformer in my package unit. on the primary side of transformer, is it only 2 wires are used at once? the old transformer that was installed had blk(120) and red(208) connected on 2 poles on the contactor and the wht (com) was cut off, not used. by doing this do you get 240v? the green (com) was grounded to the frame
You would use com-white and orange 240 to get 240v. To get 120v you would use com-white and black 120v. Make sure to individually wire nut the other high voltage wires not in use, Thanks
thanks for the reply. I think someone must went into my system and swapped out the transformer with theirs. this unit was installed less then 2 years ago. everything looks new except the transformer, which has some rust on it. there is a label under the contactor say rewire transformer for 208 if 208v is use. that mean white use to go L1 and red goes to L2. thanks for the help.
You can power the high voltage side and test for 24v to ground with a multimeter before hooking the transformer up to the controls. The ground is the base feet of the transformer where this touches the ground frame of the unit make sure the two low voltage leads are not touching the ground, thanks
thank you ,here is my first question,,,i have a 120vac to 12vac at 2amp trans,,i took a reading of the voltage on the outer wires of the sec and it was around 15 and then when i took the center tap to any other wire got a round 7 or so,,if its rated at 2 amps for the 12 v does this mean i should get 4 amps for the 6v if im using center tap? because i was able to nicely light a headlamp bulb with the 12 v @2amp but when i used the 6v thinking i would pull 4amp the brightness was half,,so what is going on?
here is my second ,,you know how you get nice sparks when you short a car battery ,im wondering is this something that can be done safely if the car is off and im only plugged into the positive and negative terminals? or negative part of the chasis? without going into lot of details i basically need to be able to get those sparks for a project,so i need to have safe low volts and high enough amps to produce the sparks,i will only need to strike them every now and then and not continuous,,so am i ok using my car to do this or is there some kind of simple electric circuit i can make that plugs in any outlet or wallmart and somehow reduces the voltage yet gives me high enough amps to do this? i was thinking of a trans and a dc bridge rectifier with capacitor for such a circuit,,problem is the 12 v 2 amps from my trans does not seem to produce workable sparks strong enough for my project,,should i simply get another trans or is there another way to do this?
but what if there is no common its a 240 system i have it hooked up just the way video shows and getting power 120 on both orange and white wires but no 24v coming off blue or yellow wires
That is actually copper wire that is tinned with wire solder to keep the strands together. That is done from the manufacturer on components often times, thanks Phollip!
AC Service Tech LLC Whew I just was thinking about all those transformers I installed and it popped into my head that I may have been doing copper to aluminum this whole time
They were copper. Strands of aluminum that small would not be safe with the lower melting point. That is why we use copper conductors in homes and when stranded aluminum is used on larger gauge wires, antioxidant compound is also applied to make sure the joint is making good contact, thanks
I've got the block style transformer 24v 120v with 4 prongs. The unit is a Diamond 80 furnace. I'm wandering where the white wire or common lands on the circuit board ?? Your experience is appreciated.
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For those that are looking for the tools used in the videos: (Linked Below)
Here is a link to the transformer used in the video- amzn.to/2d77MXY
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Here is the Link for the newer UEI DL469 Multimeter- amzn.to/2jw4ePJ
Here is the Link for the UEI DL389 Multimeter used in the video - amzn.to/2naJr9o
Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-amzn.to/2jyK5Ka
Here is a link for the Supco Magnet Jumpers amzn.to/2gS4h6z
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Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
I added a 3a fuse to my power supply (40VA) and attached two spade terminals to the hot wire of the 24v side. Works great now I feel that I protected my board better. Older system, 1999 no fuses!! THANKS Great vids by the way.
That's great to hear, yeah add that protection in. Good idea!
Wow it’s amazing how much I learn in such a short vid. I’m about to replace a broken transformer in my air handler. This give me the knowledge and confidence. Thanks!
You can do it!
So did you burn another one?
@@gibby9280 oh yes I did get one on eBay ($20) and replaced it in 15 mins. Piece of cake😊
@@obrianthinline8514 changed mine burnt it too. Learned to put a 3amp fuse. Changed sequencer,coil relay, limit switches. After several blown fuses found it was my thermostat!!
I know I'm late, but you should just leave these things for us technicians.
very good video... simple cut and dry and right to the point
Again clear instructions with demo on this field, Thank You!
This was very helpful for me to troubleshoot and confirm that I had wired a new, but faulty transformer correctly. Thank you very much for the simplification and straightforward tutorial!
VERY HELPFUL !! THANK YOU, PJP
Thank you very much for your comments, they are appreciated
I love your videos, theyre short and very informative!
Thanks Salvador Toloza!
I live in Savannah GA and my transformer died… I know!!! There are a few places I could get a new but it was after hours and they were all closed. So on a whim, I checked continuity on the primary winding between C and 230 and got nothing, however there WAS continuity between C and 208. You see where I’m going with this? I put the transformer back in the air handler, reconnected the low side and connect the high side to the C - 208 tabs. Turned on the juice, no smoke, all is good. As of the time that I am typing this, it’s been running for about 3 hours (it got up to 79 inside). Everything opens up around 7am, hopefully we make it!
Very informative. Thank you!
Glad it was helpful!
Can you do a video SHOWING how to wire a transformer exactly. Like breaking a leg off high voltage etc? Your videos help me in my hvac career & I had a hard time wiring a aprilaire ventilator yesterday when it came to wiring the damper motor to the transformer. Thanks brotha
Dapper Don, thanks for letting me know what you would like to see!
Thanks again Craig. You the man.
Glad to help, thanks!
Awesome job thank you so much
You are very welcome
god bless you my friend💪🏽
Hey I learned something! Thanks man
Awesome job thank you so much
very educative. thank you regards
Very informative thank you for the information so very much you rock
So nice of you
Thank u good sir
good vid. thank you
Thank you
thank you.
I have a question about the 240v hookup Transformer.. you said the rightway to hook up to hook up orange wire one pole that 120v of the 240v and the white wire ..do you hookup the white to the com or the other 120v line please let me know.. thank you.. if you answer that for me.
Same problem, I have no idea what to do with the white wire
@@Aureliskon a 240v circuit (one ground wire two hot wires) you wire the black line wire to orange 240v wire and the white line wire to white com wire.
Great explanation. Thank you bro.
Thank you for the information. Very useful
Thanks Daniel!
Hello Craig. Can you comment about some transformers that ground one leg of the secondary to the cabinet ? Often when you look at voltage of each secondary leg to cabinet, you get R at 16 volts and C at 8 volts.
Thanks for this video. It was very informative. Can I run two 24v UV lights off one of these transformers?
Thank you for the video. My 35VA transformer on the furnace went bad. Can I replace it with a 40VA transformer?
A 40VA will work because its slightly larger in size
Thank you for the videos
Thanks Ron!
excellent upload!
Thanks Deepblu dude!
How do you determine what size transformer to use and what size fuse to use? I am trying to add some relays to my system and I cannot find out what their coil power draw is and determine if the transformer will work.
Exactly what I needed to know. Thanks!
Glad it was helpful!
great video please do more
Thanks PBS #007!
The green wire that you mentioned being the common on the 24 volt side, Can I hook my Blue wire to the c terminal on my wi-fi thermostat? Thanks.
sweet job!!!
How should I wire it for 220v AC input and 24v output? Same as for 240v?
thanks help a ton, nice vid.
Glad to help, thanks for your comment!
Which wire do you connect the 3 amp fuse to?
To your 24 volt power side
The 24 volt wiring
@@jpintrick84 So on the LOAD wire coming out the 24v side? (or the NEC coming out the 24v side?)
I have a bad transformer, it's a 230 volt but the one they sold me is just like the one you have in your video. Do I wire it as the 240? White and orange?
Hi came across your video, can i use this transformer to step down a 120 volt thermostat on my boiler. Im looking to put in a nest thermostat, and was wondering if this could work for me, so i can get rid of the old 120v and put in a 24 volt wifi enabled nest thermostat. Would you happen to have a wiring diagram for this to be done, on a heat only system with an aquastat relay.
I’m late but would this work on a irrigation 2 wire system and if so what wires would I use and what wire could I put a fuse on the 115v side to prevent overload
Swamp cooler with 3 power for motor. Contractor, switch, and transformer wired in. Switch will not shut off. (Dual phase 240). 2 sides provide 120 each. Switch shuts off line 1. No common available. Is the transformer of a correct type?
Transformer will not power down.
Great explanation.
Thank you very much!
Hi where does the Neutral wire go? i disconnected a broken transformer with out looking at what i was doing, it seemed pretty straight forward. Now i cant figure out where to connect the white wire. the power entering is 2 phases entering the unit but no Nuetral. What do you think i could do? Thank you in advance for your help.
So if I have 2 120 volt wires no neutral no ground for a 240 volt wall heater in how do I wire transformer to come down to 120 for new 120 wall heaters. I really appreciate your help..
I have a 120/208v line voltage system with red, black, and ground wires connected (with two red wires behind my current thermostat wire nutted together for whatever reason). Will this work to power a Nest Thermostat properly? Do i still need a C wire aka their Nest Connector?
Mr Craig I have a question,3 months ago I changed a burnt control board since then I can hear what I think is the transformer humming, could this be a signal of any problem, thank you and your videos are number one on hvac teaching keep the good work
Only time they have ever buzzed for me is when I tied the wrong wire In for common. Like if you put the 120v lead and the 240v lead into the contactor or on the board the transformer buzzes then pops after a few Mins.
If I am using the white and black for 120v can I use the red as another 120v motor? If it has a neutral already?
I dont have common on a 240v system,how do i wire it?
Nice video.
For educacional purposes help me understand this. I have a 120/24v transformer. On the secondary side From terminal labeled 24vac to ground I read 17volts ans From terminal labeled 10VA to ground I read 16Volts. I read 24v across these 24v and 10VA terminals.
How do I determine which one of these two wires is the 24V hot? I was expecting to see 0v from one of these legs to ground.
You should pick any one of two as ground, connect it to the ground.
So for 240. Orange and white both get 120v?
omg, smartest presenter.... are you around right now?? lol.... Cz I need u! before I burn down the house or eletrocute myself, lol.... Tuesday, February 12 2019, 12 noon MDST(Alberta)
🤦 i hope u didn't burn your house down...
I have 3 wires on my secondary.
Hammond part # 166L25
Green , Green/yellow, Green
Is the Green/Yellow common?
They gave me two secondaries?
Could I not have just run an extra wire to a single secondary to run my two items?
I did this at home
Does the 24 volt coming from the transformer go to the board first or the thermostat
To the board then typically status light, then fuse, then safety sensors, then board therm terminals, then thermostat
When I'm hooking up a uv light and using a separate transformer do I hook the orange and white to the breaker in the air handler?
Hi Christian, were you able to find answer to this question. have you connected the UV light via transformer using orange and white to breaker ?
It's considered unsafe to connect more than one wire to each terminal of a breaker. It's better to connect the source wire from the breaker with the load wires to the 2 transformers using wire nuts.. I do see that it's been 2yrs, but still hope this helps.
Brother, fuse goes on common wire that's grouped with high voltage wires ? Do you also put another fuse somewhere on transformer or just there?
We put the fuse on the 24v red wire coming out of the transformer. You could use just plastic coated spade connectors and a 3 amp spade fuse. The high voltage side has the disconnect switch outside of the unit and the breaker inside the breaker box to protect to high voltage side, thanks Daniel!
If I was going to add an inline fuse to the 24 volt transformer side what gauge wire and amp would you recommend
Thermostat wire, 18 gauge would be fine, 3 amp would be good. Thanks
If 1.6 is all the transformer can handle on the low voltage side then why are there five amp fuses?
How hot should one of these transformers get on 120v with no load? I have one this same model that when sitting on a desk with nothing but 120v connected to white/black gets too hot to hold on to after a few hours, and another one of the same type but different brand that I just bought that isn't a whole lot cooler. Thanks.
(tmi: Using for project box overkill thermostat builds with a thermostat module and contactor switching an outlet for a window a/c or space heater, because thermostats in those things fail far too often nowadays. I currently have a window unit with a failed digital thermostat that's rewired to always on, and another newish one with a regular thermostat that sometimes needs the knob cranked around a few times before it'll kick off again. And space heaters trend towards completely random on a good day...)
On the 24v side the wires are yellow and blue. On the one i have but the one i will replace the colors are like the on you showed
Hey B San, the new transformer should come with a wiring diagram to show which one is the 24v power wire and which is the common, thanks
I just changed the Transformer on a 240v air handler I'm getting 124v to one leg and 116 V to the other leg of incoming power. But not getting 24v out of the Transformer even after changing the Transformer, would you think the 1 high voltage leg being only 116v would cause the new Transformer to not put out 24v? I tried putting in two different Transformers and still not getting any 24 volts out
You may want to contact an electrician or the electric company. Something isn't right. They should match closely.
Can you explain how the common on the primary is different from the common of the secondary side. For example on a 480v transformer, they label use black-common and Gray for 480.
Electromagnetic induction allows current to pass from one coil of wire to another coil of wire that actually are not touching but wrapped around the same iron core. I would look up electromagnetic induction or how a transformer works, thanks
Would you call it primary and secondary winding. Just like the winding in a compressor Start winding (larger) then the Run winding (smaller).
Yes the primary is larger that the secondary, thanks
Your secondary 24v red and green wires, does it matter which one is common? The transformer just says 24v green-red.
Red is usually 24v power and yes it will matter when hooking up to an HVACR unit, thanks
AC Service Tech LLC thanks!
How about you show a cold air transformer? For the rheem 10 seer air conditioner
Please let me know what works best for you guys are a lifesaver man it's hot took pictures of the transformer but no go
Gotta love utube
This is what I got here is a picc
What are you looking for? Are you saying you think you have a bad transformer? Pics don't come through on comments
Can you use a 120v/24v 50va transformer to replace a 120v/24v 40va transformer?
Absolutely
I have two electric baseboard heaters producing 16 Amps currently connected to a double pole 22A-120/240 Vac(18A-277VAC res. only) thermostat. Can I use this same contactor to connect on a 24V wifi thermostat?
am doing the same thing
I have a bad transformer on a air handler and it only has 2 wires hooked up to the hot side of the low voltage and nothing on the common side. I bought a new transformer that has wires on the low voltage side. what does the common wire go to ?
On the low voltage side on the wiring diagram, it may have the 24v common connecting to the ground chassis but you would need to verify by following the wiring diagram, thanks
Can I use a VfB class 2 transformer to run car audio amp and subs in my house? Rather then the computer power supply?
You can use a transformer but you are still talking ac voltage and not dc voltage such as 5 dc volts coming from a usb, thanks
Think I blew this installing a new thermostat.
Can you melt tatransformer with feed back?
my thermo stopped working, turned out to be the 5 amp fuse so check your fuse first. $1.29 fix
Absolutely, thanks!
Hello, I have a same part# transformer in my package unit. on the primary side of transformer, is it only 2 wires are used at once? the old transformer that was installed had blk(120) and red(208) connected on 2 poles on the contactor and the wht (com) was cut off, not used. by doing this do you get 240v? the green (com) was grounded to the frame
You would use com-white and orange 240 to get 240v. To get 120v you would use com-white and black 120v. Make sure to individually wire nut the other high voltage wires not in use, Thanks
thanks for the reply. I think someone must went into my system and swapped out the transformer with theirs. this unit was installed less then 2 years ago. everything looks new except the transformer, which has some rust on it. there is a label under the contactor say rewire transformer for 208 if 208v is use. that mean white use to go L1 and red goes to L2. thanks for the help.
Glad to help. Yes com will be one of the two line voltage wires, thanks.
I'm my universal one the 24volt side is a blue and yellow so witch one is the ground
You can power the high voltage side and test for 24v to ground with a multimeter before hooking the transformer up to the controls. The ground is the base feet of the transformer where this touches the ground frame of the unit make sure the two low voltage leads are not touching the ground, thanks
What is the work of 100 VA. AVR?
0-98-134-183-230-249-339-462,
7 terminal?
Are you referring to watts=volts X amps?
are you available for some questions?
Just post a new comment and ask any questions, thanks
thank you ,here is my first question,,,i have a 120vac to 12vac at 2amp trans,,i took a reading of the voltage on the outer wires of the sec and it was around 15 and then when i took the center tap to any other wire got a round 7 or so,,if its rated at 2 amps for the 12 v does this mean i should get 4 amps for the 6v if im using center tap? because i was able to nicely light a headlamp bulb with the 12 v @2amp but when i used the 6v thinking i would pull 4amp the brightness was half,,so what is going on?
here is my second ,,you know how you get nice sparks when you short a car battery ,im wondering is this something that can be done safely if the car is off and im only plugged into the positive and negative terminals? or negative part of the chasis? without going into lot of details i basically need to be able to get those sparks for a project,so i need to have safe low volts and high enough amps to produce the sparks,i will only need to strike them every now and then and not continuous,,so am i ok using my car to do this or is there some kind of simple electric circuit i can make that plugs in any outlet or wallmart and somehow reduces the voltage yet gives me high enough amps to do this? i was thinking of a trans and a dc bridge rectifier with capacitor for such a circuit,,problem is the 12 v 2 amps from my trans does not seem to produce workable sparks strong enough for my project,,should i simply get another trans or is there another way to do this?
@@acservicetechchannel you never replied after 5 years im seeing this now lol
i have 230 volts on my unit
Question. If I found a 40va could I replace it with a 75va? Would it be a problem?
That wouldn't be a problem, thanks
if on the 24 volt side i only have a yellow and a blue,which is common and which is hot? blue is the common,right?
Hey Kenny just check for 24v with the multimeter using one of the two wires with one probe and the other probe on the 120v common or ground, thanks
but what if there is no common its a 240 system i have it hooked up just the way video shows and getting power 120 on both orange and white wires but no 24v coming off blue or yellow wires
Isn't that aluminum wire
That is actually copper wire that is tinned with wire solder to keep the strands together. That is done from the manufacturer on components often times, thanks Phollip!
AC Service Tech LLC Whew I just was thinking about all those transformers I installed and it popped into my head that I may have been doing copper to aluminum this whole time
They were copper. Strands of aluminum that small would not be safe with the lower melting point. That is why we use copper conductors in homes and when stranded aluminum is used on larger gauge wires, antioxidant compound is also applied to make sure the joint is making good contact, thanks
I've got the block style transformer 24v 120v with 4 prongs. The unit is a Diamond 80 furnace. I'm wandering where the white wire or common lands on the circuit board ?? Your experience is appreciated.