Duuuude. Genius! As a software engineer and not an electrical engineer, I imagine this is like figuring out a decent algorithm out of thin air, implementing it, and having it work without major bugs. Awesome, now to find someone to do it to my Nutone system in Oakland, or get a Nest Pro to follow your lead.
I liken that chime module that the Nest provided like some software you downloaded that does X, Y, and Z and you're trying to make it do A, B, and C completely counter to why the code was written... Maybe it works, maybe it doesn't...
Artem Russakovskii -Hey Artem, did you find someone to install your Nest? I had 2 installers & neither one of them could do it. Just wondering, b/c I also live in the Bay.
Lee, Your video/instructions worked perfectly. I have a M/S which is functioning ok. The only thing that gave me a pause was hooking up the relay, but thanks to your video all worked as you described. Only differences, I used a second transformer and a 3 watt resistor. By the way, two local electrical companies would/could not do. Thanks.
Thanks for the feedback. After re-capping the power circuit in the NuTone, my system sounds like a 25 ohm paper cone speaker system from the 80's. Working okay is what I was going for. Nest to Sonos would be way better.
That is awesome! I have been searching to find a way to get one of these smart doorbells work exactly with my M&S dmc1 system. I really love how I can hear the doorbell in every room station and now I have to figure out a similar method. Nice Work!!
Video was very helpful. I swapped out the Nutone 15VA unit for a 30VA and went with the RIBU1C relay. It's working so far. Maybe one day I'll just swap out the Nutone for an in wall tablet...
I've learned much from your video on wiring a NEST to the Nutone IM 3003 intercom system; thank you for posting it! Here's a question about the small NEST power unit, which you surmised is a voltage doubler in your circuit. Is it possible that a video doorbell of another brand may be capable of similar application without having a small, power unit? I ask because I'm aware of two other brands --Skybell and Ring--that describe wiring their doorbells to a 2-tone, mechanical doorbell directly without a small power unit---simply wiring it in place of the original door bell button with no other modification. Is it possible that a video doorbell may be capable working this way with a mechanical door chime's electromagnet but not able to activate a relay in its place?
Yes, a device in-line could store power for itself in a capacitor and short itself at it’s power input giving the inline device (the solenoid two tone bell) the current it needs to move.
Great video, short, to the point and info rich! Can you tell us what you used for the Nest Hello backing plate to cover the old Nutone doorbell opening? Looks nice.
@laskis innovations reports below in the comment section that an eBay seller is making a plate purpose built for the NuTone/Nest Conversions. th-cam.com/channels/e3rWRC368U0hSa7Fi6zPrw.html. I used a generic plate, drilled and painted it.
Hi Lee, Thanks for the detailed explanation. I followed the instructions and still the Nest does not ring the Nutone. Need some help. Let me know if you can call me or what should I do to give you more details. Thanks, Sam
Without any of the Nest circuit, take a piece of scrap wire and try shorting the doorbell terminals on the NuTone's tone/ringer circuit board. If it rings then for some reason your relay isn't closing. If it doesn't ring, your problem is in the NuTone, not the Nest or the relay mod (most likely some dried up capacitors somewhere in the Nutone).
I have NuTone 3303 and it already has a 30 VA / 16 VAC transformer for the chime circuit. You guys are giving me confidence that I can get this done. I'm a mechanical engineer which makes me brave enough to try it, but still nervous. I've got the parts list, that Thuy Nguyen referenced, but I don't seem to need the transformer given what I've got in my 3303. I'm planning to get the rest of the parts and do the retrofit. Does this sound right? I measure 24 VAC out at the doorbell. Thanks in advance for the help!! Mike
After getting thru Christmas, and receiving all of the ordered parts, I did the install today in about 2 hours. It works perfectly!! Doing the connections bread-board style was a smart idea to confirm everything worked properly before soldering and trimming all the wires. I was able to use the existing transformer since it's already 30 VA. The whole deal cost me about $45 including shipping for the parts, including a new faceplate for outside. Well worth it to keep the existing Westminster chime tone from the NuTone! Nest needs to step up and formalize this as a kit now... Thanks for publishing your design sir.
Mike, I also have a 3303 (also a ME) and just ordered my Hello today. My unit has two 30 VA transformers; not sure what for. I haven't taken anything apart yet but did you need to add the extra relay or resistors? I would be interested in your exact setup so I can replicate.
Did you guys get this working on your 3303? I’m looking to add this setup with my arlo video doorbell. The doorbell currently doesn’t get enough power.
Hi Lee, Your video is just what I needed to be able to attempt this in my system. The only question I have is how to actually wire in the relay in my system? Could you help me out with some more details on that please?
Victor, please post an explanation if you gain clarity on this. I've got an M&S intercom and want to install Nest Doorbell as well. I think we've got to (1) add power with a 24 V transformer, but (2) then connect that "newly powered" nest back to the chime module after (3) a new relay and (4) a couple resistors. That said, I can't envision the circuit and order of connections, and I don't want to experiment by frying equipment....
@@jimwebber5923 I think the transformer installed is already powerful enough (24vac according to the sticker on it), and I already bought the relay that I found referenced somewhere else (URBEST HH52P AC 24V Coil DPDT 8... www.amazon.com/dp/B00NN5ABG2?ref=ppx_pop_mob_ap_share). I just need some help on how to connect it. I don't have much of an electrical background beyond simple switch outs of fixtures and switches. So will update if I get it done. In the comments of the relay on Amazon I found some guidance on how someone else wired it, so going to give it a shot.
I’m a dummy, but my Nutone was hooked up to a standard doorbell., with the speaker on the ceiling - but since the transformer is just 16v - 15va - it just chimes with not enough power for video. Would getting the 16V - 30Va be all I need. (Not using the Nest Chime at all - just activating Nutone chime still)?
Lee Thompson it’s the same model Nutone that you have, but they just kept a standard doorbell (once was a mechanical door chime) and it activates the Nutone chime. I briefly hooked the nest to the original door bell wires, and the light was yellow, which allowed me to ring the door bell like usual. I just don’t have enough juice for video
Didn't know about that one. Neat device. AC/DC relay, UL Listed. Looks like a big improvement over my choice as it will work well with spec or over spec transformers.
hi, I have a nutone LB-55. It is not an intercom system but it is an electronic doorbell with wiring for doorbell to the rear of the house (just a single bell) and one for the front of the house which is a westminister tone. I want to switch out the front door bell to a nest hello. Will your instructions work? I am assuming that they will , do you know where to purchase the relay, also can you make a more detailed video on this. I have searched and searched for a new door chime to work with the nest hello and there is some problem with all of them. I would love it if I could use your instructions and hook up my existing doorbell to the nest hello. I would even be happy to pay you to send me the kit to do this !!
Follow the wire from the doorbell switch wires. When those move over to the Nest circuit from the Nutone circuit, the switch at the door is electrically replaced at the Nutone by the closing contacts of the relay (same idea as the IM3003 hack). Should be the same resistor and relay. You'll need to figure out how to power the old chime and the new Nest. If you share the transformer like I did, you will need to add fuses and upgrade the transformer. To validate the resistor choice, measure the voltage drop at the relay coil. Should be between 11 and 13 VAC. Mine was 12.2 VAC This is interesting th-cam.com/video/u5QWNmaOKdU/w-d-xo.html
I wish I could find someone in Los Angeles to do this. I have multiple Nest products installed already and really want to install the doorbell. Seem my only option might be a Ring with the battery.
Lee, it seems now that most sources for the relay you recommended are on several weeks back order for some reason. Can you suggest a replacement relay that might be easier to find? Thanks
I know I am a little late to this post but I just connected my Nutone IM4406 into my Feit Video Doorbell Camera and it does not power on the Doorbell Camera. If I straight wire the Camera at the front door to the separate 24vac powering the camera it works fine. But when I wire in the relay I go from getting 24 thvrough the system to 5v... which is not enough to power on the camera... what could I be doing work... or do I maybe have a faulty relay?
I have two Nest home hubs that will alert us when the doorbell is pressed and the Nutone chime sounds like crap anyway . Can't I just disconnected the Nutone chime altogether so that I don't have to mess with any of this?
Absolutely. I just can’t have something in my walls that isn’t working. So the choice was integrate it or a bunch of drywall work. I chose the integration path. Thanks for posting.
Looking at your channel. Very relevant! I have an ‘04 Tahoe that I dropped a Texas Speed 408 cid stroker motor into. Damn costech heads.... Ruined the original motor.
Lee Thompson awesome! I just started researching a motor swap. I want low end torque-actually looked into swapping in an 8.1 Vortec (going for overkill) but looks like that may be a lot more work than it’s worth. Next I was weighing out swapping in an LQ9 vs just building my current L59 (200k on it).
Hi Lee - Thank you for sharing this. You are the only person I can find that got this working. I am ordering the parts so I can do this myself. Which relay are you using (brand and or model) - or at least what are the specs? I don't believe any random 12vac relay will work?
Thank you very much, Lee! It took a little hunting to find that specific relay, because they are out of stock everywhere... but Sager does have them in stock. www.sager.com/ly1f-ac12-138230.html
I finally got around to examining the internal circuitry of my NuTone IM4406 and it's powered by two 801 transformers. Can your instructions still apply? My technical skills are at the beginner level.
Darrell Westbrook first off, these aren’t instructions. This is some dude on the internet doing something potentially really stupid. That said, maybe look into adding a third transformer which is dedicated to the Nest and the relay coil.
@@StagrLee I'm at the bread-board phase and can successfully get power to the Nest doorbell, however, when I jump the relay coil to the Nutone chime it plays in loop. Any suggestions?
See what the voltage drop is across the relay. I’m wondering if the relay is releasing (opening back up). There is a setting in the nest on how long to “chime”. I set mine to 1 second.
Interesting mod to the circuit using a 24VAC relay instead of a 12VAC relay as you can eliminate the resistor. I think this might work as the NuTone transforms seem to be over voltage. Mine was 19 VAC. It depends on what is going on inside the chime module. www.reddit.com/r/Nest/comments/8kekhz/nest_hello_can_work_on_an_intercom_system
Two fuses come off the same transformer terminal. This isolates the Nest from the Nutone. Since the Nutone transformers are internally regulated its probably optional but I like the extra isolation this gives. Especially considering how old the Nutone base station is. If the Nutone shorts out, the Nest Doorbell will keep chugging along.
Lee Thompson How would I get 10VA more transformer power? Edit: We also have multiple intercoms throughout the house. Would the chime work through all of them if I did this? Forgive me, my knowledge of circuitry is limited.
Sorry for the delayed response. As shown in the video, you just need to short circuit the two connections in the Nutone to start the chime. With one Nest, you need one relay to provide the closed (short) circuit. With two nests you would wire in two relays. My Nutone has a different tone for Front/Rear doors so the second relay would short different terminals. You’d have to figure out which one. Your other question about the power. The Nest requires 10VA. To do two, you would need 20VA. I’d probably use a 30VA Nutone transformer to power both Nests and a separate transformer to power the Nutone. The Nutone at my house needs 15VA. The power requirement depends on which Nutone you have.
Northside Service Co does a deep dive on this mod. His mod is interesting if you want both your Nest and your Nutone on your front door. I went with replacement of the Nutone at the front of the house. th-cam.com/video/t6YswmDNVyI/w-d-xo.html
YOU ARE AMAZING!!!! This is exactly what I want to do with my same old ugly Nutone system. Is it possible for you to give me all the part so I can replicate what you are doing please?
Protect yourself... Make sure you have working smoke detectors in case this goes up in smoke. Nutone C907 transformer Omron LY1F-AC12 Relay 100 Ohm 3 Watt Resistor Solder/Wire/Shrink Tube Kyle Switch Plate SPNT6H45 Bussman Fuses and holders from Home Depot (1 amp AC) Small Gap HVAC sealing tape gasket from Home Depot for the back of the new switch plate
Get more room by removing the intercom.. th-cam.com/video/VdiL1rOYgWc/w-d-xo.html Make sure the transformer is powered off at the main panel. The transformer bracket mount is just an L bracket of steel with one screw flush with (usually) the bottom of the rough-in box.
![“อ.เบียร์ คนตื่นธรรม” มาตามคำเรียกร้อง แหกศาสตร์ฮวงจุ้ย เตือนสติอย่างมงาย | แฉ 7 พ.ย. 67 [1/3]](http://i.ytimg.com/vi/5fc4S3xBNfc/mqdefault.jpg)
Duuuude. Genius!
As a software engineer and not an electrical engineer, I imagine this is like figuring out a decent algorithm out of thin air, implementing it, and having it work without major bugs.
Awesome, now to find someone to do it to my Nutone system in Oakland, or get a Nest Pro to follow your lead.
I liken that chime module that the Nest provided like some software you downloaded that does X, Y, and Z and you're trying to make it do A, B, and C completely counter to why the code was written... Maybe it works, maybe it doesn't...
Artem Russakovskii -Hey Artem, did you find someone to install your Nest? I had 2 installers & neither one of them could do it. Just wondering, b/c I also live in the Bay.
@@shawnaross6464 Not yet, but I'm looking at this again now. www.reddit.com/r/Nest/comments/8kekhz/nest_hello_can_work_on_an_intercom_system/
Thank you!!!! This was my lifesaver on hooking mine up!! The parts list in the comments below helped immensely!!
Lee,
Your video/instructions worked perfectly. I have a M/S which is functioning ok. The only thing that gave me a pause was hooking up the relay, but thanks to your video all worked as you described. Only differences, I used a second transformer and a 3 watt resistor. By the way, two local electrical companies would/could not do. Thanks.
Thanks for the feedback. After re-capping the power circuit in the NuTone, my system sounds like a 25 ohm paper cone speaker system from the 80's. Working okay is what I was going for. Nest to Sonos would be way better.
That is awesome! I have been searching to find a way to get one of these smart doorbells work exactly with my M&S dmc1 system. I really love how I can hear the doorbell in every room station and now I have to figure out a similar method. Nice Work!!
Did you get your DMC1 working with nest or ring doorbell? I also have a DMC1.
Video was very helpful. I swapped out the Nutone 15VA unit for a 30VA and went with the RIBU1C relay. It's working so far. Maybe one day I'll just swap out the Nutone for an in wall tablet...
Damn, you scienced the s*** out of that!
I've learned much from your video on wiring a NEST to the Nutone IM 3003 intercom system; thank you for posting it!
Here's a question about the small NEST power unit, which you surmised is a voltage doubler in your circuit. Is it possible that a video doorbell of another brand may be capable of similar application without having a small, power unit? I ask because I'm aware of two other brands --Skybell and Ring--that describe wiring their doorbells to a 2-tone, mechanical doorbell directly without a small power unit---simply wiring it in place of the original door bell button with no other modification.
Is it possible that a video doorbell may be capable working this way with a mechanical door chime's electromagnet but not able to activate a relay in its place?
Yes, a device in-line could store power for itself in a capacitor and short itself at it’s power input giving the inline device (the solenoid two tone bell) the current it needs to move.
I completed this today! Thanks for the video you are the best!
Great video, short, to the point and info rich! Can you tell us what you used for the Nest Hello backing plate to cover the old Nutone doorbell opening? Looks nice.
@laskis innovations reports below in the comment section that an eBay seller is making a plate purpose built for the NuTone/Nest Conversions. th-cam.com/channels/e3rWRC368U0hSa7Fi6zPrw.html. I used a generic plate, drilled and painted it.
Hi Lee, Thanks for the detailed explanation. I followed the instructions and still the Nest does not ring the Nutone. Need some help. Let me know if you can call me or what should I do to give you more details.
Thanks, Sam
Without any of the Nest circuit, take a piece of scrap wire and try shorting the doorbell terminals on the NuTone's tone/ringer circuit board. If it rings then for some reason your relay isn't closing. If it doesn't ring, your problem is in the NuTone, not the Nest or the relay mod (most likely some dried up capacitors somewhere in the Nutone).
@@StagrLee Thanks Lee! It works when I short the doorbell. So does that mean, I have to get a new relay.
I just get a click sound from the relay.
Hi Lee, Thank you! It finally worked. Appreciate your help.
You get this working?
I have NuTone 3303 and it already has a 30 VA / 16 VAC transformer for the chime circuit. You guys are giving me confidence that I can get this done. I'm a mechanical engineer which makes me brave enough to try it, but still nervous. I've got the parts list, that Thuy Nguyen referenced, but I don't seem to need the transformer given what I've got in my 3303. I'm planning to get the rest of the parts and do the retrofit. Does this sound right? I measure 24 VAC out at the doorbell.
Thanks in advance for the help!!
Mike
After getting thru Christmas, and receiving all of the ordered parts, I did the install today in about 2 hours. It works perfectly!! Doing the connections bread-board style was a smart idea to confirm everything worked properly before soldering and trimming all the wires. I was able to use the existing transformer since it's already 30 VA. The whole deal cost me about $45 including shipping for the parts, including a new faceplate for outside. Well worth it to keep the existing Westminster chime tone from the NuTone!
Nest needs to step up and formalize this as a kit now...
Thanks for publishing your design sir.
Mike, I also have a 3303 (also a ME) and just ordered my Hello today. My unit has two 30 VA transformers; not sure what for. I haven't taken anything apart yet but did you need to add the extra relay or resistors? I would be interested in your exact setup so I can replicate.
Did you guys get this working on your 3303? I’m looking to add this setup with my arlo video doorbell. The doorbell currently doesn’t get enough power.
Hi Lee,
Your video is just what I needed to be able to attempt this in my system. The only question I have is how to actually wire in the relay in my system? Could you help me out with some more details on that please?
Victor, please post an explanation if you gain clarity on this. I've got an M&S intercom and want to install Nest Doorbell as well. I think we've got to (1) add power with a 24 V transformer, but (2) then connect that "newly powered" nest back to the chime module after (3) a new relay and (4) a couple resistors. That said, I can't envision the circuit and order of connections, and I don't want to experiment by frying equipment....
@@jimwebber5923 I think the transformer installed is already powerful enough (24vac according to the sticker on it), and I already bought the relay that I found referenced somewhere else (URBEST HH52P AC 24V Coil DPDT 8... www.amazon.com/dp/B00NN5ABG2?ref=ppx_pop_mob_ap_share). I just need some help on how to connect it. I don't have much of an electrical background beyond simple switch outs of fixtures and switches. So will update if I get it done. In the comments of the relay on Amazon I found some guidance on how someone else wired it, so going to give it a shot.
@@victorwhite1048 Keep the 24V transformer away from the Nutone. The Nutone's that I am familiar with are 16VAC systems
I’m a dummy, but my Nutone was hooked up to a standard doorbell., with the speaker on the ceiling - but since the transformer is just 16v - 15va - it just chimes with not enough power for video. Would getting the 16V - 30Va be all I need. (Not using the Nest Chime at all - just activating Nutone chime still)?
A guess here, but do you have an NuTone intercom or just a NuTone doorbell. NuTone has made regular doorbells since 1930's...
Lee Thompson it’s the same model Nutone that you have, but they just kept a standard doorbell (once was a mechanical door chime) and it activates the Nutone chime. I briefly hooked the nest to the original door bell wires, and the light was yellow, which allowed me to ring the door bell like usual. I just don’t have enough juice for video
Could you have used the RIBU1C relay for the relay? It has a 10-30V input coil.
Didn't know about that one. Neat device. AC/DC relay, UL Listed. Looks like a big improvement over my choice as it will work well with spec or over spec transformers.
hi, I have a nutone LB-55. It is not an intercom system but it is an electronic doorbell with wiring for doorbell to the rear of the house (just a single bell) and one for the front of the house which is a westminister tone. I want to switch out the front door bell to a nest hello. Will your instructions work? I am assuming that they will , do you know where to purchase the relay, also can you make a more detailed video on this. I have searched and searched for a new door chime to work with the nest hello and there is some problem with all of them. I would love it if I could use your instructions and hook up my existing doorbell to the nest hello. I would even be happy to pay you to send me the kit to do this !!
Follow the wire from the doorbell switch wires. When those move over to the Nest circuit from the Nutone circuit, the switch at the door is electrically replaced at the Nutone by the closing contacts of the relay (same idea as the IM3003 hack). Should be the same resistor and relay. You'll need to figure out how to power the old chime and the new Nest. If you share the transformer like I did, you will need to add fuses and upgrade the transformer. To validate the resistor choice, measure the voltage drop at the relay coil. Should be between 11 and 13 VAC. Mine was 12.2 VAC
This is interesting th-cam.com/video/u5QWNmaOKdU/w-d-xo.html
I wish I could find someone in Los Angeles to do this. I have multiple Nest products installed already and really want to install the doorbell. Seem my only option might be a Ring with the battery.
Lee, it seems now that most sources for the relay you recommended are on several weeks back order for some reason. Can you suggest a replacement relay that might be easier to find? Thanks
At least it is less than the wait for a vaccine or one of my replies to the discussions :)
I know I am a little late to this post but I just connected my Nutone IM4406 into my Feit Video Doorbell Camera and it does not power on the Doorbell Camera. If I straight wire the Camera at the front door to the separate 24vac powering the camera it works fine. But when I wire in the relay I go from getting 24 thvrough the system to 5v... which is not enough to power on the camera... what could I be doing work... or do I maybe have a faulty relay?
Sounds like you have the wiring all wrong. No idea how the Feit works.
oi! this might be outta my league, looking to do the same but with a eufy doorbell cam
I have two Nest home hubs that will alert us when the doorbell is pressed and the Nutone chime sounds like crap anyway . Can't I just disconnected the Nutone chime altogether so that I don't have to mess with any of this?
Absolutely. I just can’t have something in my walls that isn’t working. So the choice was integrate it or a bunch of drywall work. I chose the integration path. Thanks for posting.
Lee Thompson yeah I can appreciate that. I’d be the same way if I owned this place, but we’re renting. 😩
Looking at your channel. Very relevant! I have an ‘04 Tahoe that I dropped a Texas Speed 408 cid stroker motor into. Damn costech heads.... Ruined the original motor.
Lee Thompson awesome! I just started researching a motor swap. I want low end torque-actually looked into swapping in an 8.1 Vortec (going for overkill) but looks like that may be a lot more work than it’s worth. Next I was weighing out swapping in an LQ9 vs just building my current L59 (200k on it).
If you have any tips, would definitely appreciate it.
Hi Lee - Thank you for sharing this. You are the only person I can find that got this working.
I am ordering the parts so I can do this myself. Which relay are you using (brand and or model) - or at least what are the specs? I don't believe any random 12vac relay will work?
See discussion thread below with Thuy Nguyen on parts. Thuy reports a working version.
Thank you very much, Lee! It took a little hunting to find that specific relay, because they are out of stock everywhere... but Sager does have them in stock. www.sager.com/ly1f-ac12-138230.html
Weird... maybe everyone is retrofitting their old Nutones!
I bought mine here: www.mouser.com/ProductDetail/omron/ly1f-ac12/?qs=CqvodWcFzOdfG4kiuA4Dag%3d%3d&countrycode=US¤cycode=USD
cheaper than sager...
Thanks, again! Your tutorial was exactly what I needed. I finished getting it all hooked up yesterday and it is all working great.
I finally got around to examining the internal circuitry of my NuTone IM4406 and it's powered by two 801 transformers. Can your instructions still apply? My technical skills are at the beginner level.
Darrell Westbrook first off, these aren’t instructions. This is some dude on the internet doing something potentially really stupid. That said, maybe look into adding a third transformer which is dedicated to the Nest and the relay coil.
@@StagrLee I'm at the bread-board phase and can successfully get power to the Nest doorbell, however, when I jump the relay coil to the Nutone chime it plays in loop. Any suggestions?
See what the voltage drop is across the relay. I’m wondering if the relay is releasing (opening back up). There is a setting in the nest on how long to “chime”. I set mine to 1 second.
Interesting mod to the circuit using a 24VAC relay instead of a 12VAC relay as you can eliminate the resistor. I think this might work as the NuTone transforms seem to be over voltage. Mine was 19 VAC. It depends on what is going on inside the chime module. www.reddit.com/r/Nest/comments/8kekhz/nest_hello_can_work_on_an_intercom_system
Where are the fuses hooked onto? Is it one fuse to each wire coming off the transformer?
Two fuses come off the same transformer terminal. This isolates the Nest from the Nutone. Since the Nutone transformers are internally regulated its probably optional but I like the extra isolation this gives. Especially considering how old the Nutone base station is. If the Nutone shorts out, the Nest Doorbell will keep chugging along.
Nice job!
This is incredible. Would there be any changes if you want to install 2 doorbells?
You would need to find 10VA more transformer power to the 2nd Nest Hello and two relays in parallel.
Lee Thompson How would I get 10VA more transformer power?
Edit: We also have multiple intercoms throughout the house. Would the chime work through all of them if I did this?
Forgive me, my knowledge of circuitry is limited.
Sorry for the delayed response. As shown in the video, you just need to short circuit the two connections in the Nutone to start the chime. With one Nest, you need one relay to provide the closed (short) circuit. With two nests you would wire in two relays. My Nutone has a different tone for Front/Rear doors so the second relay would short different terminals. You’d have to figure out which one. Your other question about the power. The Nest requires 10VA. To do two, you would need 20VA. I’d probably use a 30VA Nutone transformer to power both Nests and a separate transformer to power the Nutone. The Nutone at my house needs 15VA. The power requirement depends on which Nutone you have.
Northside Service Co does a deep dive on this mod. His mod is interesting if you want both your Nest and your Nutone on your front door. I went with replacement of the Nutone at the front of the house. th-cam.com/video/t6YswmDNVyI/w-d-xo.html
YOU ARE AMAZING!!!!
This is exactly what I want to do with my same old ugly Nutone system. Is it possible for you to give me all the part so I can replicate what you are doing please?
Protect yourself... Make sure you have working smoke detectors in case this goes up in smoke.
Nutone C907 transformer
Omron LY1F-AC12 Relay
100 Ohm 3 Watt Resistor
Solder/Wire/Shrink Tube
Kyle Switch Plate SPNT6H45
Bussman Fuses and holders from Home Depot (1 amp AC)
Small Gap HVAC sealing tape gasket from Home Depot for the back of the new switch plate
Thanks! Btw how did you pull out the old transformer ... the space is sooo compact. Also what did you do with speaker line from outside the house ....
Get more room by removing the intercom.. th-cam.com/video/VdiL1rOYgWc/w-d-xo.html Make sure the transformer is powered off at the main panel. The transformer bracket mount is just an L bracket of steel with one screw flush with (usually) the bottom of the rough-in box.
th-cam.com/video/yXA-YdNqwwU/w-d-xo.html
Thank you so much... I got my system working with the intercom today... pretty sweet