New install and questions about Taco controls ( Ron Jr. )

Unknown

This was in Wantagh . I was in Sayville a few days ago though , for a system 2000 install .

Unknown

Another tights spot

You can always tell how tight a boiler room is by the angle of the pics . Not much room to work in at this home . I included a pic of the date code on the expansion tank . Looks like a punch hole in 1973 . There was very little pressure left on the tank , but the diaphragm was still intact and holding back water . Not bad for sitting sideways for 35 years .

Robert O'Brien

Is the

job in Port Jeff Sta? Or Sayville?Just south of Sunrise off Broadway? Not too many of the old top coil V&E left!

Unknown

Burnham V83 and Superstor Contender

We left enough room to access the chimney . And the shelves to the right are movable to get to the side cleanouts and the top of the boiler .

Now the Taco questions .........

We integrated the boiler , zones and the indirect with a Honeywell triple aquastat ( 8124A ) and a Taco 3 zone relay with priority . We wired it as a " tankless coil " application , which is supposed to shut down the zones if the boiler drops below the low limit setting .

Problem is , the zones do not shut off when this happens .

I remember the Taco relays used to have dedicated ZC - ZR contacts and a separate isolated end switch . These new relays still have the dedicated ZC terminal , but ZR is shared with one side of the isolated end switch now . Could this be the reason none of the zones turn off when the temp dips below the low limit setting ? We've run into this problem before , but I forgot all about it till today .

Thanks for any help in advance .

Robert O'Brien

Why

not use the end switch terminals to T-T on the 8124 and "warm start" it? Do you want the indirect circ to operate through the reverse? I've thought about this on cold start jobs,if the boiler temp is below the indirect you're actually making the DHW cooler until the boiler temp rises.I don't want the LL function however and since no one has complained.....

Mark Eatherton

F.P.O.S.I.A.T.P.B.

FIVE POUNDS OF SUGAR IN A TWO POUND BAG. Nice....

Question, in the BEFORE picture, there is a spring looking coil of copper. Was this someone's idea of a water hammer shock absorber?

Great work, as usual.

ME

Unknown

It is \" warm start \"

The controls will keep the boiler at the the minimum we set it at if there's no call on the zones - 130 degrees .

We want the indirect and the heating zones to work through the reverse . Hooked in with priority seems like the best way with a big draw on hot water . And this house has a big draw .

Problem is none of the zones shut down when the temp drops below the low limit . We wired it exactly like the instructions say ........... Power to H , ZC of the 8124 to ZC of the Taco ( with a jumper to X1 ) , and ZR of the 8124 to X2 of the Taco . No other jumpers . The low and high limit work like they're supposed to ......... for the burner .

But not for controlling the circs . This has me perplexed

Unknown

Yep

The coil is a common site in homes around here . As well as the 12 inch pieces of 3/4 vertical pipe with caps on the tops . I've heard these homemade knock tubes work wonderfully ......... for an hour or 2 till the air escapes naturally .

These crazy tight spots are so normal that we don't even complain anymore that the cabinets , wheelchairs , safes , stoves , mostly just plain ol' junk ..... is in the way . We just work around the piles . I was considering offloading that cabinet to the right but the truth is there was no place to put the stuff . And this was a fairly uncluttered basement

Thanks alot Mark .

Rich Ferris

The Jumper between ZC and H needs to be removed

Ron,

You may already have this figured out.


Rich

chris_93

taco diagram

Ron,

http://www.taco-hvac.com/uploads/FileLibrary/100-9.0.pdf

pg 6 should be what you are looking for.

Unknown

That diagram

and the one that is inside the cover of the Taco control are exactly the same . We wired it just like the diagram , except we removed the jumper between P and ZC for priority . Thanks for the .pdf link .

Unknown

Yes

That jumper is out . Thanks for the heads up .

Joe Mattiello

Back in December of 2005 the product manager for the electronic controls division released a document explaining taco's need to change the alternative wiring schematic for the switching relays. For your reference I attached a copy, along with the original wiring diagram. Perhaps, reading it will shed some light on why Taco made the necessary change. However, if you need to use the tank less wiring schematic, you can refer to the old drawing (also attached), as long as you keep the L8124, and the SR503 on the same safety switch. Following this schematic will de-energize ZC when the boiler temperature drops below the min set point prioritizing the tank less coil. FYI, the boiler maintains the 140 degrees approx. so hot water is available on demand. If the demand is excessive, and boiler temperature drops below the minimum set point the L8124 will drop out ZC so the circulators drop out.

If your objective is to retrofit the tank less, and plan on adding an indirect water heater, it would make economical sense eliminating the minimum temperature set point on the L8124, and using the cold start boiler schematic. This will allow the system to run more efficiently.

Todd S_11

Post Purge Card

Hi Joe,
If the post purge card is add to one of the switching relays, won't this in effect be the same thing as what the System 2000 Heat Manager does? I think that by purging the heat from the boiler into the domestic should certainly increase the AFUE of a boiler. Obviously you need to be sure there is antiscald protection for the domestic.

Unknown

Thank you Joe

I forgot if the 3 zone relay used to have separate ZC-ZR and isolated end switch terminals . Like the 4 zone relay . I'm going to print that diagram and keep it on the truck .

It's hard to believe that this has been a big enough issue to alter the wiring diagram . I've never wired a boiler using 2 separate power sources . But I guess anything's possible .

We replaced this boiler while the outside temps were in the teens . When we finished and had the 2 zones of heat going the boiler temp did not pass 130 degrees for about 45 mins . I know the boiler won't run at low temps most of the time so this might not be a big issue .

What I'd love to see is a control that'll cold start a boiler and kick it up to the high limit when a zone calls - with a low limit to keep the circs off till the temp rises in the boiler .

Thanks again Joe .

bob young

COPPER ANTI-KNOCK COIL

In the sixties it was mostly strictly air chambers . those anti-knock coils were a manufactured item available in any supply house. deluxe hi- tech item