Great video, thank you! A lot of videos have tips and tricks but don't explain what's happening. The way you go into the details, especially about the thermal coil and why the valve takes so long to open, is incredibly helpful. No need to remember tricks now, I know how it works!
Iv been doing hvac for 5 years and had 3 years of schooling and this video is superrrrrr helpful even for me I get confused sometimes! Thank you for the clarity!
Good day sir I am so happy I came across your channel because yesterday I had a lot of problems trying to figure out about wiring the zone valves with red and yellow wires. Every channel on UA-cam I tried is like a whole PhD course on how to get it done, and I just received all the information that I need from you in just a few minutes you are a master at what you do and you are a great asset to us thank you so much.
Thank you so much for your concise explanations. Your videos helped us narrow down a problem through a process of elimination. Your videos are invaluable to the DIY er.
Awesome explanation. I used your functional diagram and your demonstration to swap my half-dead Taco ZV for a Honeywell clone. Sweating it in was the easy part. The wires drove me nuts! Thanks! Liked and subscribed!
I'm going to be doing a boiler wiring video this weekend, from zones valves, aquastat all the way down to roll/spill switches and the gas valve. I'll do a white Roger vid eventually. I like to actually have a few for the making of the video but I don't see them too often.
Sure. Terminal 2 in the middle is common. You should find a wire from there tracing all the way back to the common on a transformer. You can hook your common up anywhere on that line.
Nice video, thank you. Maybe I missed something. What about the operation of the lever to OPEN, or not to OPEN? How does that work within the operation of this valve? Thank you, John
@WillWinder great video. One quick question maybe I missed the part when you explained 1 valve setup wiring...... is that at the beginning of the video?
Hi Mike, quick question if you have a second to answer. I have an oil burner with three zones; all zone valves are TACO, with a 24v transformer. Two of my zones have Google Nest thermostats (and they work fine). The 3rd zone has an old mercury thermostat. I purchased a Honeywell RTH6500WF WiFi thermostat, and the manual says the device will only work with the C Wire connected. The current thermostat has a red wire to the R terminal and a white wire to the W terminal. A third wire (green) in the wall is not connected to anything, and when I trace it back to the zone valve, the green wire is not connected to anything at the zone valve either. Do I need to use the green wire if 24 v is going to the thermostat via the red wire? I went with the Honeywell because it was cheaper than buying a 3rd Nest. My AC is a separate system from my heat and uses a separate thermostat (A Honeywell connected via a TCC gateway). So I hope if the new Honeywell will work, I can add it to my TCC account.
Learning a lot, thanks. Got a clarifying question about my established system, installed late 80s I believe. It's been working fine until recently (I think its a bad valve, gonna keep poking at it). My valves are currently wired with tstat R on terminal 1, 24V xfrm on terminal 2, furnace on terminal 3. I found this vid's wiring and thought it would be better to do it as you have it so that the tstat controls the current on 2 and 3, ideally turning off the furnace when it stops being called. As it is, seems like as long as the valve is open it leaves the boiler running since 2 is getting constant 24V. So if there's a stuck valve (mine is) it ends up constant calling. Is there a reason to have it wired how it is, or would it be better to switch it? Also, it looks like the furnace TnT terminals are both live when being called? One coming off the 24V xfrm and one coming off terminal 3 of the valve. Is that right? I've gotta be missing something, since the system obviously works. Any help would be appreciated!
T stat should not control terminals 2 and 3. Only terminals 1 and 2. A complete circuit between 1 & 2 is controlled by the thermostat which in turn activates the powerhead that will release the end switch and open and close the valve body in the process. The end switch is your control of the furnace circuit on 2 and 3 only. It will not control the valve body if you're trying to bypass 1 & 2 to directly control the TT circuit with the stat. Terminal 2 should only lead back to the transformer common that is shared by both circuits.
Thank you. Only reason is because the connection is more secure with one wire at the screw terminal. With 2 or more wires there, it's possible that vibrations over time can sometimes wiggle one of the wires loose. It's kind of rare, but it's one less potential problem avoided.
If you have two of these (two zone system) and there is heat to one zone, but none in the other zone, AND you have bled the air out of the system, is the valve head the likely culprit? In other words, even if the other valve opens and turns the boiler on, will the other valve with the faulty head remain closed and cold?
Yes that's a possibility, but without a multimeter test I couldn't say if it's the physical valve body that's bad or the head. Most likely the head. A quick continuity or ohm test between terminals 1 and 2 will tell you (wires disconnected). If no continuity, change the head. If reading OL on ohms, same issue.
Hi Jersey, in case of combi boiler I am using Utica MAC-150 when should I use external circulator pump? If I do need it can I use only 1 pump for return in case of two zone house (with zone valves)? Is there a way to install circulating pump without control board, using only the boiler TT terminals? Thank you so much for such a helpful videos.
My videos cover typical, standard wiring practice, but sometimes HVAC guys get a little creative and do things a little differently. Typically if it doesn't work, this is usually the case.
One thing when you do a continuity check between terminal 1&2 you got to make sure that the T stat is turned all the way down. So you also won't read through the T stat, and give you a false hope.
It's alternating current, so no. They can be switched and the circuit can still work. But most transformers will have a "load" and "common" label just to indicate which is the 24 volt source.
On my four year old Crown Boiler: the red and white wires going down to my Boiler's TT ... does it matter where the R & W wires connect at the Boiler's TT... I don't see a any markings (+ -) at the T T.
Question, I have 2 zones in my house with one of these for each zone, thermostat in bedroom and dining room. Bedroom thermostat and valve work fine. Dining room wasn't working, I figured thermostat cuz its a really old mercury. I changed it, it worked for about a day then nothing. Won't kick on boiler but will click when i pass room temp on the dial. When i check the voltage it was aroud 22. Also, Valve is really hot even when the other "working" valve is cool. My work around was to manually open the valve, basically turning my house into a single zone running off my bedroom, which isn'ta long term solution. It seems 90% likely the valve is the problem. Any thoughts?
What is the VA rating of the transformer and what voltage are you reading off of it? It could be the valve but 22 volts is a little low. Typically I read 26-28 volts off of transformers.
Hi Mike, I asked this question on another video, but found this one to be more specific to my question. I currently have 4 zones operated by 4 thermostats and 4 taco valves. I want to combine 2 (downstairs) valves and have them operated by one thermostat- turning two zones into one. How do you suggest I do this without removing and replumbing the system?
You should be able to just run a jumper wire from the #1 terminals on the two valves you want to operate together and just disconnect the wire on the #1 terminal coming from the stat you don't want to use anymore. As long as those 2 valves are operating on the same transformer that should work.
I just followed your direction and the system does exactly what it is supposed to do and works perfectly! Many thanks @jerseymikehvac for your support. This 12” wire jumper I’m sure would have cost me hundreds to get a technician out here to do. I appreciate the value of your instruction and the confidence given to help the homeowner do it ourselves!
my Bryant BW1 boiler heat has a honey well controls limit, transformer an relay 3 wires red white an blue going to the taco valves There are 2 valves how do I wire those 3 wires if you dont mind..thank you
Those wires get tied into the boiler's burner circuit, which is often power fed through a different step down 24v transformer. They usually run into the boiler itself near the controls and get tied into two T&T wires made available for that purpose.
I have 3 zone valves. I am having connection issues with zone valve #2 terminal #2 since this has wires 3 wires all tied into it with the screw from terminal #2. The 3 wires are coming from the following. - First wire from zone valve #1 terminal #2. - Second wire from transformer - Third wire from zone valve #3 terminal #2. Can all 3 wires be put in a ring terminal where then the ring terminal is held in place by the screw from zone valve #2 terminal #2 for a better connection? And if yes, do you recommend a specific ring terminal?
Yes. you can do that. Though I would take all 3 wires off of the #2 terminal, snip back and re-strip them, twist them all together with a 4th wire and secure them with a wire nut. Take the 4th wire and put a spade connector on it and secure that back to the #2 terminal.
I have three wires but the zone valve doesn’t turn on the boiler. The pump is always on and the boiler kicks on when aqua stat calls for heat. Trying to troubleshoot one zone to see if it’s the power head or tstat.
My condo association told me my zone valve was installed backwards and causing "rumbling" idk in the pipes? The maintenance guy took my white wire off terminal 1 and left the red wire on terminal 2. Do I just swap the red and white wires? Was it wired backwards or installed backwards on the pipes? Please help
Depends how it's wired, when you're testing and where you're testing at the valve. If it's working, you'll have 24volts on terminal one on a call for heat.
where's the final connection for the 3rd wire? I see its connected to the XFMR common (white) and wire#3 (red) all connected but where's the final connection? does go back to the boiler?
If u don't hear click on tstat and room temp is 62 degrees when setting goes past 62 a click should be heared, if you don't hear that click would tstat be bad?
It depends. Sometimes that could be an indication of a bad stat, but not always. A lot of stats these days have built in delays on them, so even during a call for heating or cooling, there may be a 5-minute delay if the mode was changed from one to the other, if the power was interrupted, if there is a zoning system or if it's just an efficiency feature of a smart stat. Sometimes it's a communication issue between equipment the stat isn't picking up on which can be a set-up/programming issue on new smart stat installs. Typically, if a system isn't doing what its supposed to be doing after giving a stat enough time to work through delays, I'll bypass the thermostat to try to force start the system. If the system starts up, I start suspecting thermostat issues.
Have a strange diagnostic condition that isn't covered in this video. Maybe somebody can help. The 2 and 3 terminals have continuity on both of my zone valves, even when the valve is closed and there's no call for heat. The valve still opens when the thermostat calls and closes when there's no call, but there's always continuity between the common and the end switch. As a result, my circulator pump runs constantly, even when there's no call for heat. Even tried killing the power to the boiler and unhooked all of the wires, just to make sure it wasn't because of a hack wiring job, but still have continuity. Is this a common failure, or is there something else happening in the boiler?
Question sir. I live in a 38/unit building and NONE of the zone valves have a wire connecting terminal 3 on the outside. Is this because no one unit can fire up the pump and boiler on their own but only turn the valve on or off from the thermostat? Thx
Not exactly. Often in a building like that the circuit will run through a box somewhere installed by the power company which allows them to keep track of how much time each apartment calls for heat so they can each be billed accordingly. Each apt still retains the ability to turn on the boiler, but it's not being done directly through the end switch in the valve.
@@JerseyMikeHVAC is that true if there is no separate gas bills for each unit as we all pay an assessment each month that covers all gas used including on the boiler? Thank you
@@JerseyMikeHVAC ok are you saying that third connection would be for an electric circulating pump? That makes sense why none of the zone valves have a wire running to the third spot as no one valve would control a pump in a building with all these units. Does this sound correct? Thx again. Sorry to bother you with questions
@Fireneedsair I would have to see what's there to know for sure, but if it isn't that then there is a relay board somewhere that's wired in-between the thermostat and the zone valve, and the relay board sends a separate signal to the boiler. Either way, a boiler should turn on if any thermostat is calling.
I live in a multiunit sharing the same boiler. My apartment never goes above 68 F degrees no matter how high the thermostat is set for. Is the thermostat being bypassed? I'm thinking the new landlord would like nothing better than to be able to do this.
It's a possibility the way some people are, but there are other issues I can think of first. Are all the baseboards hot or just some? The boiler max water temp limit could have been lowered too. Usually set from 180 to 195. A bypassed thermostat will either not provide heat to the zone at all or will run constantly. A second thermostat could be spliced in somewhere, I suppose, but you'd have to get pretty creative to limit temps to 68 in a remote space using it. You'd most likely have large temperature swings.
@@JerseyMikeHVAC Yeah... I've talked to some of the other tenants and most of the are using extra heaters in their apartments. So it's quite possible the boiler temp is being kept lower now under the new owner. I tried a manual over-ride at the valve unit and it didn't seem to change much. Thanks for the suggestions all the same.
@@JerseyMikeHVAC: I'm in a condo where we share the same boiler. I have two wires from the thermostat and two from the transformer, does that make a difference?
Great video, thank you! A lot of videos have tips and tricks but don't explain what's happening. The way you go into the details, especially about the thermal coil and why the valve takes so long to open, is incredibly helpful. No need to remember tricks now, I know how it works!
Iv been doing hvac for 5 years and had 3 years of schooling and this video is superrrrrr helpful even for me I get confused sometimes! Thank you for the clarity!
Glad it helped!
Good day sir I am so happy I came across your channel because yesterday I had a lot of problems trying to figure out about wiring the zone valves with red and yellow wires. Every channel on UA-cam I tried is like a whole PhD course on how to get it done, and I just received all the information that I need from you in just a few minutes you are a master at what you do and you are a great asset to us thank you so much.
You are most welcome
Thank you so much for your concise explanations. Your videos helped us narrow down a problem through a process of elimination. Your videos are invaluable to the DIY er.
Great Video. You have made the wiring crystal clear to me.
Awesome explanation. I used your functional diagram and your demonstration to swap my half-dead Taco ZV for a Honeywell clone. Sweating it in was the easy part. The wires drove me nuts! Thanks! Liked and subscribed!
You’re the man Mike! currently learning to follow my father & grandfather’s footsteps w control wiring, let’s get to that money baby👍
Thank you. Your video helped me finally grasp wiring and diagnosing these valves. Much appreciated.
No problem.
Great video boilers are and overlooked area of our field is crazy!!!!
Great video exactly what I needed to figure out the wiring in this house thanks!!!
You're welcome!
Perfect explanation! Thank you!
Thank you, great video.
Thank you
Great video thank you!
Your good, very informative video.
Thank you.
👍👍🌟🌟🌟🌟🌟
Awesome video man
Brilliant.
This was very helpful thank you
You're welcome.
OMG thank you for this!!!
No problem!!
This helped. I though 3 was 24v once end switch closes so had problem with relay for boiler. This answered problem i had
That was amazing.. good job.
Thank you, Shawn.
Are you gonna make a videos about other zone valve like white Roger. And boiler wiring
I'm going to be doing a boiler wiring video this weekend, from zones valves, aquastat all the way down to roll/spill switches and the gas valve.
I'll do a white Roger vid eventually. I like to actually have a few for the making of the video but I don't see them too often.
Hi JM. Thanks for the detailed explanation on the taco zone valve wiring.
Can you please do a video on the taco mechanism?
Thank
Kamrul
Thank you
You're welcome
I wish you had explained couple words about the lever on zone valve for manually controlling !!!
Can i run a c-wire with this setup, for a smart thermostat?
Sure. Terminal 2 in the middle is common. You should find a wire from there tracing all the way back to the common on a transformer. You can hook your common up anywhere on that line.
Nice video, thank you. Maybe I missed something. What about the operation of the lever to OPEN, or not to OPEN? How does that work within the operation of this valve? Thank you, John
@WillWinder great video. One quick question maybe I missed the part when you explained 1 valve setup wiring...... is that at the beginning of the video?
Hi Mike, quick question if you have a second to answer. I have an oil burner with three zones; all zone valves are TACO, with a 24v transformer. Two of my zones have Google Nest thermostats (and they work fine). The 3rd zone has an old mercury thermostat. I purchased a Honeywell RTH6500WF WiFi thermostat, and the manual says the device will only work with the C Wire connected. The current thermostat has a red wire to the R terminal and a white wire to the W terminal. A third wire (green) in the wall is not connected to anything, and when I trace it back to the zone valve, the green wire is not connected to anything at the zone valve either. Do I need to use the green wire if 24 v is going to the thermostat via the red wire? I went with the Honeywell because it was cheaper than buying a 3rd Nest.
My AC is a separate system from my heat and uses a separate thermostat (A Honeywell connected via a TCC gateway). So I hope if the new Honeywell will work, I can add it to my TCC account.
You can use the green wire as the common. C at thermostat, terminal 2 at zone valve.
@@JerseyMikeHVAC thank you. I appreciate you helping me
Learning a lot, thanks. Got a clarifying question about my established system, installed late 80s I believe. It's been working fine until recently (I think its a bad valve, gonna keep poking at it).
My valves are currently wired with tstat R on terminal 1, 24V xfrm on terminal 2, furnace on terminal 3. I found this vid's wiring and thought it would be better to do it as you have it so that the tstat controls the current on 2 and 3, ideally turning off the furnace when it stops being called. As it is, seems like as long as the valve is open it leaves the boiler running since 2 is getting constant 24V. So if there's a stuck valve (mine is) it ends up constant calling. Is there a reason to have it wired how it is, or would it be better to switch it?
Also, it looks like the furnace TnT terminals are both live when being called? One coming off the 24V xfrm and one coming off terminal 3 of the valve. Is that right? I've gotta be missing something, since the system obviously works. Any help would be appreciated!
T stat should not control terminals 2 and 3. Only terminals 1 and 2. A complete circuit between 1 & 2 is controlled by the thermostat which in turn activates the powerhead that will release the end switch and open and close the valve body in the process. The end switch is your control of the furnace circuit on 2 and 3 only. It will not control the valve body if you're trying to bypass 1 & 2 to directly control the TT circuit with the stat.
Terminal 2 should only lead back to the transformer common that is shared by both circuits.
Awesome video! Why do you prefer a wire nut instead of both wires sharing terminal 2?
Thank you. Only reason is because the connection is more secure with one wire at the screw terminal. With 2 or more wires there, it's possible that vibrations over time can sometimes wiggle one of the wires loose. It's kind of rare, but it's one less potential problem avoided.
If you have two of these (two zone system) and there is heat to one zone, but none in the other zone, AND you have bled the air out of the system, is the valve head the likely culprit? In other words, even if the other valve opens and turns the boiler on, will the other valve with the faulty head remain closed and cold?
Yes that's a possibility, but without a multimeter test I couldn't say if it's the physical valve body that's bad or the head. Most likely the head. A quick continuity or ohm test between terminals 1 and 2 will tell you (wires disconnected). If no continuity, change the head. If reading OL on ohms, same issue.
@@JerseyMikeHVAC Thanks for the reply. I'm going to do the multimeter tests tomorrow.
Will a stuck valve cause a circulator pump to constantly run?
Does the boiler cycle on and off with it? Or all alone constantly?
Hi Jersey, in case of combi boiler I am using Utica MAC-150 when should I use external circulator pump? If I do need it can I use only 1 pump for return in case of two zone house (with zone valves)? Is there a way to install circulating pump without control board, using only the boiler TT terminals? Thank you so much for such a helpful videos.
I tried to wire everything the way you shown on the video but I am not getting any power to that thermostat.
My videos cover typical, standard wiring practice, but sometimes HVAC guys get a little creative and do things a little differently. Typically if it doesn't work, this is usually the case.
One thing when you do a continuity check between terminal 1&2 you got to make sure that the T stat is turned all the way down. So you also won't read through the T stat, and give you a false hope.
Good tip!
Where is the T stat ?
@@purenaturefy That is short for thermostat.
The transformer red wire and white wire have positive and negative ?
It's alternating current, so no. They can be switched and the circuit can still work. But most transformers will have a "load" and "common" label just to indicate which is the 24 volt source.
On my four year old Crown Boiler: the red and white wires going down to my Boiler's TT ... does it matter where the R & W wires connect at the Boiler's TT... I don't see a any markings (+ -) at the T T.
They are interchangeable. Doesn't matter.
Question, I have 2 zones in my house with one of these for each zone, thermostat in bedroom and dining room. Bedroom thermostat and valve work fine. Dining room wasn't working, I figured thermostat cuz its a really old mercury. I changed it, it worked for about a day then nothing. Won't kick on boiler but will click when i pass room temp on the dial. When i check the voltage it was aroud 22. Also, Valve is really hot even when the other "working" valve is cool. My work around was to manually open the valve, basically turning my house into a single zone running off my bedroom, which isn'ta long term solution. It seems 90% likely the valve is the problem. Any thoughts?
What is the VA rating of the transformer and what voltage are you reading off of it? It could be the valve but 22 volts is a little low. Typically I read 26-28 volts off of transformers.
Hi Mike, I asked this question on another video, but found this one to be more specific to my question. I currently have 4 zones operated by 4 thermostats and 4 taco valves. I want to combine 2 (downstairs) valves and have them operated by one thermostat- turning two zones into one. How do you suggest I do this without removing and replumbing the system?
You should be able to just run a jumper wire from the #1 terminals on the two valves you want to operate together and just disconnect the wire on the #1 terminal coming from the stat you don't want to use anymore. As long as those 2 valves are operating on the same transformer that should work.
@@JerseyMikeHVAC I'll give it a try- Thank you for such a fast response and I'll let you know if this works or not.
I just followed your direction and the system does exactly what it is supposed to do and works perfectly! Many thanks @jerseymikehvac for your support. This 12” wire jumper I’m sure would have cost me hundreds to get a technician out here to do. I appreciate the value of your instruction and the confidence given to help the homeowner do it ourselves!
@@justindashiell7171 Good job
my Bryant BW1 boiler heat has a honey well controls limit, transformer an relay 3 wires red white an blue going to the taco valves There are 2 valves how do I wire those 3 wires if you dont mind..thank you
Where are the #3 (red) wires from both Taco Zone valves going? Where would they connect ?
Those wires get tied into the boiler's burner circuit, which is often power fed through a different step down 24v transformer. They usually run into the boiler itself near the controls and get tied into two T&T wires made available for that purpose.
I have 3 zone valves. I am having connection issues with zone valve #2 terminal #2 since this has wires 3 wires all tied into it with the screw from terminal #2.
The 3 wires are coming from the following.
- First wire from zone valve #1 terminal #2.
- Second wire from transformer
- Third wire from zone valve #3 terminal #2.
Can all 3 wires be put in a ring terminal where then the ring terminal is held in place by the screw from zone valve #2 terminal #2 for a better connection? And if yes, do you recommend a specific ring terminal?
Yes. you can do that. Though I would take all 3 wires off of the #2 terminal, snip back and re-strip them, twist them all together with
a 4th wire and secure them with a wire nut. Take the 4th wire and put a spade connector on it and secure that back to the #2 terminal.
how many zone valves could you put on 1. 24 volt transformer
Typically, a 40va transformer is good for 3 Taco zone valves.
I have three wires but the zone valve doesn’t turn on the boiler. The pump is always on and the boiler kicks on when aqua stat calls for heat. Trying to troubleshoot one zone to see if it’s the power head or tstat.
I've seen a triple aquastat that has a built in transformer labeled T TV Z can u do an in depth video on that?
I go into one of those aquastats in this video here: ua-cam.com/video/eB8TCjX541M/v-deo.html
My condo association told me my zone valve was installed backwards and causing "rumbling" idk in the pipes? The maintenance guy took my white wire off terminal 1 and left the red wire on terminal 2. Do I just swap the red and white wires? Was it wired backwards or installed backwards on the pipes? Please help
If it is backwards, it is the valve body that is backwards, not the wiring. Wiring has to go on the same exact way as it was before.
So I get 25 volts from my transformer but I get about 1volt from my taco. But they still working. Is there something wrong?
Depends how it's wired, when you're testing and where you're testing at the valve. If it's working, you'll have 24volts on terminal one on a call for heat.
Can you make a video on wiring a system 2000 energy manager?
where's the final connection for the 3rd wire? I see its connected to the XFMR common (white) and wire#3 (red) all connected but where's the final connection? does go back to the boiler?
I go over all of it late in the video.
Did you find where the third wire goes?@@JerseyMikeHVAC
Any propress models ?
Haven't really seen one yet. I'm going to have to get my hands on one soon.
If u don't hear click on tstat and room temp is 62 degrees when setting goes past 62 a click should be heared, if you don't hear that click would tstat be bad?
It depends. Sometimes that could be an indication of a bad stat, but not always. A lot of stats these days have built in delays on them, so even during a call for heating or cooling, there may be a 5-minute delay if the mode was changed from one to the other, if the power was interrupted, if there is a zoning system or if it's just an efficiency feature of a smart stat. Sometimes it's a communication issue between equipment the stat isn't picking up on which can be a set-up/programming issue on new smart stat installs.
Typically, if a system isn't doing what its supposed to be doing after giving a stat enough time to work through delays, I'll bypass the thermostat to try to force start the system. If the system starts up, I start suspecting thermostat issues.
@@JerseyMikeHVAC @l.a.m7645 Where can I find the T Stat
Have a strange diagnostic condition that isn't covered in this video. Maybe somebody can help. The 2 and 3 terminals have continuity on both of my zone valves, even when the valve is closed and there's no call for heat. The valve still opens when the thermostat calls and closes when there's no call, but there's always continuity between the common and the end switch. As a result, my circulator pump runs constantly, even when there's no call for heat. Even tried killing the power to the boiler and unhooked all of the wires, just to make sure it wasn't because of a hack wiring job, but still have continuity. Is this a common failure, or is there something else happening in the boiler?
So you have continuity between 2 and 3 terminals on BOTH zone valves with the power off? Even with the wires disconnected?
Just wish I had seen this before replacing a perfectly functional relay😕
Question sir. I live in a 38/unit building and NONE of the zone valves have a wire connecting terminal 3 on the outside. Is this because no one unit can fire up the pump and boiler on their own but only turn the valve on or off from the thermostat? Thx
Not exactly. Often in a building like that the circuit will run through a box somewhere installed by the power company which allows them to keep track of how much time each apartment calls for heat so they can each be billed accordingly. Each apt still retains the ability to turn on the boiler, but it's not being done directly through the end switch in the valve.
@@JerseyMikeHVAC is that true if there is no separate gas bills for each unit as we all pay an assessment each month that covers all gas used including on the boiler? Thank you
@@Fireneedsair Might not be for gas, but electric, like circulator pumps.
@@JerseyMikeHVAC ok are you saying that third connection would be for an electric circulating pump? That makes sense why none of the zone valves have a wire running to the third spot as no one valve would control a pump in a building with all these units. Does this sound correct? Thx again. Sorry to bother you with questions
@Fireneedsair I would have to see what's there to know for sure, but if it isn't that then there is a relay board somewhere that's wired in-between the thermostat and the zone valve, and the relay board sends a separate signal to the boiler. Either way, a boiler should turn on if any thermostat is calling.
I live in a multiunit sharing the same boiler. My apartment never goes above 68 F degrees no matter how high the thermostat is set for. Is the thermostat being bypassed? I'm thinking the new landlord would like nothing better than to be able to do this.
It's a possibility the way some people are, but there are other issues I can think of first. Are all the baseboards hot or just some? The boiler max water temp limit could have been lowered too. Usually set from 180 to 195.
A bypassed thermostat will either not provide heat to the zone at all or will run constantly. A second thermostat could be spliced in somewhere, I suppose, but you'd have to get pretty creative to limit temps to 68 in a remote space using it. You'd most likely have large temperature swings.
@@JerseyMikeHVAC Yeah... I've talked to some of the other tenants and most of the are using extra heaters in their apartments. So it's quite possible the boiler temp is being kept lower now under the new owner. I tried a manual over-ride at the valve unit and it didn't seem to change much. Thanks for the suggestions all the same.
The common wire from terminal 3 and another common white wire coming from the transformer there is 2 common wires going to the boiler
you can't check continuity on a zone valve (or any device) with the circuit wires connected.
You can, you just have to make sure the circuit is open at the stat (not calling).
Your the Saggymaster
I missed terminal 3. Do I need that for a single zone?
Yes. That completes your T & T circuit so the boiler knows when to fire up and shut down.
You didn't show the terminal 3 hook up. Does it go back to the neutral on the transformer?
I show the complete wiring on all 3 terminals in the later part of the video.
@@JerseyMikeHVAC: I'm in a condo where we share the same boiler. I have two wires from the thermostat and two from the transformer, does that make a difference?
Wire it the same as the others.