Taco 007 replacement and Pressure/Temp

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  #41  
Old 01-05-19, 02:15 PM
T
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Spott

Have a question about C wire. Looks like my system is very old and only has 3 wires.
https://photos.app.goo.gl/jj19KJAsuESJkoA4A

Installed the Nest Thermostat fine. It's working to control the system, but seems like there's not enough current to charge the battery inside the thermostat.
https://photos.app.goo.gl/c4YZiu4cAfhPoCS8A

Looks like rewiring isn't an option since the cables run inside the walls and go up and down 10-20 ft. Also looks like Venstar Add-a-wire isn't an option either since i'm starting out with 3 wires. Also doesn't look like i can adapt to the boiler either...
https://photos.app.goo.gl/zKR3hUndXkhLEKVA9
https://photos.app.goo.gl/qMmQTGjLhLVMnd3o7
Do you have any recommendations?
 

Last edited by twkid; 01-05-19 at 02:52 PM.
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  #42  
Old 01-05-19, 05:20 PM
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T,
This is why I was hoping you would take a break, lol. I was going to mention your possible C wire problem but I figured I would hope for the best.

Anyway I posted something for you to read below about the nest.

What you can do is to put your Green wire, which is your fan wire, onto C terminal. By doing this you lose the ability to run your fan in the manual position, but on auto the system will work normally. This will solve your C problem for now. It sounds like your only other option is to pull a new 4 or 5 conductor t-stat wire.

PJ may stop by with more thoughts. This is right in his wheel house, but for now move your G wire to C and test.

https://smartthermostatguide.com/no-...your-own-risk/
 
  #43  
Old 01-06-19, 09:20 AM
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Thanks spott

I'm running 18psi for the system now.

I found this vent to have a very very slow bubbling from the vent hole.
https://photos.app.goo.gl/oPqQgA6zXcHJKM9d6
Should I replace this?
I'm guessing this is direct replacement?
https://www.supplyhouse.com/Taco-418...4-MNPT-Hy-Vent
 

Last edited by twkid; 01-06-19 at 10:33 AM.
  #44  
Old 01-06-19, 10:50 AM
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T,
If that vent is leaking water it is time to replace it. That one you found is a direct replacement and also in my opinion a better quality vent that can be taken apart and cleaned if necessary.

However you may want to check out the sight below for your options. You look like you have a fairly tight fit there and may want to improve on your access.

They make a slim line version of that vent which will be pictured but where this air vent is serviceable what I would do is to come off the boiler with an 1/8" x ? whatever length you want to get you higher and easier to access height, then an 1/8" shutoff, another nipple, a coupling and then the vent.

This will give you easier access and a means of isolation for maintenance or replacement.

Remember to leave the cap on the vent loose for proper operation and use thread sealant and it doesn't have to be super tight where you won't be able to remove it later on.

NIP-SHUTOFF-NIP-COUPLING-VENT. All 1/8" fittings.

https://www.supplyhouse.com/sh/contr...hText=hy-vents

https://www.supplyhouse.com/sh/contr...22+ball+balves

https://www.supplyhouse.com/sh/contr...+black+nipples

https://www.supplyhouse.com/sh/contr...%28imported%29
 
  #45  
Old 01-06-19, 10:55 AM
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looks like a half inch to me, rather than a 1/8"
 
  #46  
Old 01-06-19, 11:02 AM
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The threaded part is the 1/8". What part are you measuring. They are pretty standard size coming off the boiler but you would better when you remove it and get whatever size you need.
 
  #47  
Old 01-06-19, 11:07 AM
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T,
On the page below scroll down to see what I believe you have. You will see different options. This is the brand of your current vent.

https://www.supplyhouse.com/Maid-O-M...-Valves-312000

https://www.supplyhouse.com/Jacobus-...-1-8-Auto-Vent
 
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