Welcome to Plbg.com
Thank you to all the plumbing professionals who offer their advice and expertise

Over 600,000 posts related to plumbing

Welcome to Plbg.com (aka: PlumbingForum.com) we are the most popular plumbing information sharing, advice, DIY and educational forum on the Web. Ask any toilet, sink, faucet, pump, water quality, and plumbing related questions. Please refrain from asking where to purchase a product, business, pricing, or legal questions, for contractor referrals, or any questions not related to plumbing. Keep all posts positive and no advertising. This site is free and made possible by:  

Post New
Search
Log In
How to Show Images
Newest Subjects
 Aquastat + taco zone controller issue
Author: Joey c (NY)

Just installed taco z404 3 zones with 1 circulator + 3 zone valves. Problem is I cannot get the aquastat to fire the burner, I have all 3 zones calling for heat and isolated end switch (on zvc) wired to TV & T on the aquastat (Honeywell L8148E) normally I hear the damper open once that fully opens the boiler fires, I have to manually energize the relay on the aquastat to get the boiler to fire. It's getting late now, hopefully someone can get me going on this soon or I'll be sitting at the boiler all nite providing heat. Note the isolated end switch does not output power (assuming 24vac) what am I missing here??? Thanks
Joey "C"

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You have missed something in the ZVC instructions.The end switch is just a set of contacts. Did you wire the zone valves correctly? Sounds like it may be waiting for an end switch on a zone valve.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: packy (MA)

joey, you are in good hands with my friend from CT.

Post Reply

 Thanks for the quick response :-)
Author: Joey c (NY)

Everything is indicating properly so I am assuming all is well, hmm red wires indicate yellow wires for motor control, yep that's how I gave it. Plus all of the "red" led are on the zvc indicating all zone valves open? Any other suggestions?
Thanks for the quick response



Edited 1 times.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Let the aquastat run the circ, not the zvc. That is when you are using zone 4 with an indirect, and priority. You're missing something. You need to stop saying it's right, and find what's wrong. Not trying to be mean, but you have to look at it correctly.

Post Reply

 Thanks packy!! :grin:
Author: Joey c (NY)

Thanks packy!! , Paul I just ohm'd out the end switch and I get what your saying, but now would I have to "daisy chain" all of the end switches, or splice into the xfmr to input 24v to the "dry contact" in order to get the aquastat to turn on via the tv&t?



Edited 1 times.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

No....the aquastat has its own 24v. It just passes thru the end switch to fire the boiler. What zone valves are you using?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

I fully understand paul no offense taken, I'm trying to be objective about this as I can believe you me I know I'm missing something I just can't find it, one would think if the instructions were such that you wire the isolated end switch to the aquastat as shown, that the power 24vac would be provided via all or any zone valve end switches being closed and no need to run wires.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Ohhhh k, I'm using honeywell 8043 24v..zvs

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

The end switch is like nothing more than the contacts of a t-stat. What are the zone valves?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

We are getting close here paul.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

The red leads of each zone valve are on terminals 3 and 4 of each zone?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Honeywell (V8043E1012) 24v 4 wire 2 yellow for motor, 2 red for end switch)

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You're not running an indirect hot water heater on zone 4 are you?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

No the I'm not even using 4th zone, as I have an entirely seperate dhw tank independent of the boiler

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

I currently have the relay tricked out (Aquastat) and is turning on & off I am imagining because of the high limit ? Is this bad?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

So zone 4 priority is "OFF"?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You're just closing the T and TV from the aquastat? Circ running?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Yes

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Yes z4 priority is OFF.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You're controlling the circ with the ZVC. It won't run if you just jump the aquastat. Which contacts are you using for the circ? Should be the ones on the left. Not zone 4

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Disconnect the aquastat from the end switch. With zones calling the resistance across the end switch should be "Zero".

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Ok will get right back to you

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Zero ohms across the isolated end switch on the taco

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Check for 24v from one of the Aquastat leads to ground.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

If you jump those 2 wires and the boiler fires, then zero ohms means it should fire also, through the ZVC.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Just got called for dinner be back in 10m, thx

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

I'm back but not sure if I follow, when you are referring to aquastat leads, which are you referring to? The aquastat on the boiler minus the ones coming from the end switch of the Taco?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

The only leads on the aquastat that read voltage is the 110vac at C1, and L1, no 24vac to ground, on anything, this being done with TT/& TV wires removed from aquastat, didn't read anything with or without the relay being energized either.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

The 2 wires coming from the aquastat that connect to the end switch on the ZVC. Check those.....Put your black meter lead on a good ground, and touch the red lead to one wire at a time. There should be 24v AC on one.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

How were you "tricking" the boiler to get it to fire before?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

I energized the relay manually and shoved a piece of wire coiled up to keep the contacts closed, the wires terminals TT/TV that go to the isolated end switch haven't any power

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Then you have a bad transformer on the aquastat.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Ohhhh noooooo. Is it safe for me to keep the contactor energized?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

I took the 2 wires off the aquastat (from the xfmr) reading 24 vac on T1&T2 sounds like an open circuit, would you agree?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

What are you running? Oil-fired boiler?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Nat gas

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

At the aquastat.....Black meter lead to ground, red on "T" terminal, any volts. Then "TV" terminal, any volts?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Trying to work thru this to a conclusion.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Changed xfmr same thing put 110 in got 24vac out nothing on TT/TV, now question : if I put 2 wires into a xfmr and 2 wires out (assuming step down) I shouldn't be reading anything to ground on the secondary.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

It's AC. The resistance in the meter allows for a reading. Please check it as I asked.In the same way, you can find the hot and the neutral in an outlet.



Edited 1 times.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

I'm using an analog meter, not sure if that makes a difference however looking at this now I pulled the pcb away from the aquastat itself and trying to follow this thing out the T2 is tied directly to the TV via the pcb so I so have energy on the TV via the T2 (secondary of xfmr, however I do not read anything to earth, I will now ground the chassis of the xfmr, and apply an earth ground to it maybe this will work.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You're not following, and are getting way ahead of things. I can't help you if I don't know what you're doing.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Ok I'm going to smoke a cigarette and come back. I appreciate your help I really do, and I can feel your frustration, I've been on this thing all day!! I can take a few pics if you want me to?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

The ZVC is working fine. We know that because you had zero ohms on the end switch. You need 24 v out of the aquastat on one wire, thru the end switch then back to the relay on the aquastat.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Now you got my attention, just to give you a little history about my previous position. I worked on traffic control system for RR and relentless troubleshooting, however that's what I used to do, and the way you just explained that made much sense to me. I'll be going back inside soon as I am done with the smoke, be patient with me, I know I would have lost my mind with someone like me too!! But that would have happened much sooner! !

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Ok Paul here we go got the 24vac going from TV thru the taco and coming back in on the TT, but the relay isn't energized.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Btw, it helps when you turn up a tstat!!

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

LOL........Is it working?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

No, thinking this frickin relay took a dump on me. I have energy on it but it's not pulling in (magnetizing the armature) wtf do I do now??!!

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You have a hot to the relay coil...got a neutral?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Yes

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Wring out the relay coil...is it open?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Can the coil be removed? I removed a screw from the back of itjust don't want to pry too much and break the things

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

I don't think so. Check resistance thru the coil.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Not open! !

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

OK...I don't know what you've done with the transformer, but I suspect you've got things out of whack.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Not really out of whack, put everything back wire for wire, heck I even swapped the secondary just to see if polarity was any issue but no Chang the thing just ain't pulling in!!

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Not sure how to go about this I suspect everything will be closed tmrw and Sunday, wonder if I can count on the limit switch to do its job and jumper out the relay. Your thoughts? ?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

I'd get another aquastat tomorrow.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

I wouldn't leave it like that. I'd get the house warm, when needed, while I stood there. Are you looking at the wiring diagram?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

No not anymore I'm just about done, blackman (supplier by me is open tmrw I think aquastat relay just don't know why it won't pull in with energy on both sides of the coil... I have seen stranger things

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

You hooked up the 2 secondary wires from the transformer to each side of the coil?

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Joey c (NY)

Not simultaneously one at a time, in short yes

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Hook them both up, at once. One is hot, one is neutral

Post Reply

 Thanks Paul :thumb:
Author: Joey c (NY)

No dice, put both hot and neutral on simultaneously NADA!!! I'm going out for smoke house is at a comfortable 74, should be about 63 when I wake up!! I think aquastat is it guess I will find out tmrw. Thanks for your patience and understanding. I will post tmrw under same subject.
Thanks Paul and have a good night. And I pulled the Styrofoam coffee cup from under the relay! !



Edited 1 times.

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Good Luck......Happy holidays!

Post Reply

 Re: Aquastat + taco zone controller issue
Author: Paul48 (CT)

Joey c..........Did you get it straightened out?

Post Reply





Please note:
  • Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.
  • Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.
  • Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.
  • Plbg.com is also not a place to ask radiant heating (try HeatingHelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Search for plumbing parts on our sponsor's site:




Special thanks to our sponsor:
PlumbingSupply.com


Copyright© 2017 Plbg.com. All Rights Reserved.