Taco 570 Zone Controls


  #1  
Old 10-24-07, 01:10 PM
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Taco 570 Zone Controls

Background.

Added second floor FHW loop to existing boiler (Weil-Mclain). One circulator feeding two zones. Zones will be controlled by Taco 570s. Boiler is 2 years old. Everything works fine if I leave the zone controls unpowered and force them into the open postion. Both floors heat up nicely.

Issue:

Connected everything up according to the schematic. Used a supplemental transformer to power the 2 Taco 570s. Using Thermostat to call for heat the Zone control(s) don't seem to operate. No noise can be heard coming from the 570's. Smoke (small amount) started to come from the 570. Removed power. Didn't want to leave on. Tried both 570's individually with same result. Started to question my wiring but it seems correct.

So, how do I know if the zone valve has been activated? Obvioussly I can wait until the water flows and heats up past the zone control, but shouldn't there be some audible indication (i.e. any kind of noise) when the zone control is active? Eventually shouldn't the boiler be tripped to turn on the circulator?

Thanks in advance.
 
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Old 10-24-07, 01:48 PM
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Smoke is probably not normal. These are slow-acting zone valves, though. They can take well over a minute to open after being energized.

If your thermostats have an anticipator setting, make sure it's in spec with the zone valves. Can't remember what it should be. 0.9 amps???
 
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Old 10-24-07, 03:23 PM
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Smoke

Smoke out of an electrical component is certainly not good. My guess is something is wired wrong & you've smoked the power head of the valves.
http://www.taco-hvac.com/uploads/FileLibrary/100-3.pdf
See figure C on page 3 for wiring.



Yes, the heat anticipators, if your thermostats have them, should be set to 0.9-1.0 amps.
 
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Old 10-25-07, 03:01 PM
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To answer your question "Hot to tell if the valve is open." The handle you would use to open manually will move up and down with no resistance.
 
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Old 10-29-07, 12:34 PM
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Talking Zone Valve wiring success

Thanks to Rbeck for the common sense test, i.e. using the manual lever on the zone control to see if the valve had indeed opened. It seemed so obvious when reading it, but it bever dawnd on me while staring at the zone valve and scratching my head....

This zone valve has no audible clues as to its operation. There was a small amount of smoke that came from zone 2. Must have had something on the coils as it operated just fine.

The wiring was fine and the zones did work the first time I turned it on, but lost faith when I didn't hear any sounds of operation and saw the small amount of smoke.

All is well and I now have a much deeper understanding of how the zone valve works. Maybe some day I'll even use it....
 
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Old 10-29-07, 06:46 PM
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Torser

Did you ever determine the cause of the smoke? Glad things are working well.
 
 

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