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Old 01-20-2010, 04:56 PM   #31
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Boiler outdoor reset control


All of those are low voltage wires.

The line voltage wires for your circ. Are inside the junction box that control is mounted on.

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Old 01-20-2010, 05:10 PM   #32
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Boiler outdoor reset control


www.taco-hvac.com has all the wiring diagrams for their stuff

www.tekmar.com has the same thing

honeywell's site also
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Old 01-20-2010, 06:09 PM   #33
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Boiler outdoor reset control


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All of those are low voltage wires.

The line voltage wires for your circ. Are inside the junction box that control is mounted on.
I understand that I have line voltage being controlled by low voltage. Does the circ pump wiring need to be separated? I don't see a provision on my ZVC for line voltage control. Only line voltage on the ZVC appears to be the power supply to the unit.
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Old 01-20-2010, 06:25 PM   #34
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Boiler outdoor reset control


Yes. the line voltage of teh circ has to be removed from the relay of the boiler.

On your ZVC. You should have main end switch, extra end switch.

Use the main end switch to control circ. And the second end switch to operate boiler.

Or. if you use the Weil McLain BCP, or Tekmar.
The main end switch tells the BCP, or Tekmar it has a heat call. And the BCP or Tekmar turns on the circ and boiler.

Witch control are you going to use. Its easier if we only talk about one outdoor reset control for wiring.
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Old 01-21-2010, 06:40 AM   #35
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Boiler outdoor reset control


When I remove the circ from the boiler relay, I'll need to add a pump relay (SR501) into the system correct? As far as wiring, I'm looking at the Tekmar D256. If I'm reading the schematic correctly:

ZVC Main end switch connects to the Tekmar (boiler demand). Tekmar goes out to the boiler.
ZVC second end switch connects to the circ relay (SR510) and then line voltage out from the 501 to the pump.
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Old 01-21-2010, 10:01 AM   #36
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Boiler outdoor reset control


I am totally no expert. Maybe you are making this more complicated than it is. I just recently added a 256 to an Argo-controlled boiler. My case was more complicated because I wanted to use priority for the domestic hot water and had to add a relay. I downloaded the picture below from the web and have no connection or approval or whatever from the originator, but it helped me.
Attached Files
File Type: pdf TEKMAR_256_ARM3P[1].pdf (96.4 KB, 280 views)
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Old 01-21-2010, 10:42 AM   #37
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Boiler outdoor reset control


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Maybe you are making this more complicated than it is. I just recently added a 256 to an Argo-controlled boiler. My case was more complicated because I wanted to use priority for the domestic hot water and had to add a relay. I downloaded the picture below from the web and have no connection or approval or whatever from the originator, but it helped me.
I'm sure I'm making it more complicated than it is .
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Old 01-21-2010, 01:02 PM   #38
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When I remove the circ from the boiler relay, I'll need to add a pump relay (SR501) into the system correct? As far as wiring, I'm looking at the Tekmar D256. If I'm reading the schematic correctly:

ZVC Main end switch connects to the Tekmar (boiler demand). Tekmar goes out to the boiler.
ZVC second end switch connects to the circ relay (SR510) and then line voltage out from the 501 to the pump.
No you wouldn't have to, the outdoor reset control has its own built in relay for that.

But. My head is in left field this week.

All you have to do with the reset control is have it break the orange wire from the relay center on your boiler to your high limit on your boiler. That will shut the burner down, but allow the circ to stay running.
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Old 01-21-2010, 01:36 PM   #39
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Boiler outdoor reset control


The second end switch from the ZVC would be the input to the reset control?
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Old 01-21-2010, 01:40 PM   #40
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Yes. That will tell it that there is a heat call.
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Old 01-21-2010, 01:50 PM   #41
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Boiler outdoor reset control


Thanks!! My wife will be so excited to see me tearing into the heating system again!

I'll let you know how it goes.
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Old 01-22-2010, 10:00 AM   #42
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Boiler outdoor reset control


Sure would have been easier to do the Taco ZVC-EXP control and just plug in the Taco PC700 OD reset control to the ZVC panel.
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Old 01-22-2010, 11:39 AM   #43
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Boiler outdoor reset control


I agree it would be simpler. I came up withh a cost difference of $300 between the Tekmar 256 and the ZVC/PC700 combo. I'd also wind up replacing a 1 year old ZVC-404 with a ZVC-404-EXP. Kinda hard for me to justify.
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Old 02-28-2010, 10:31 PM   #44
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Boiler outdoor reset control


Found this chart as an example of reset control Temps
Not sure if it is accurate at all

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Old 03-03-2010, 09:26 AM   #45
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Boiler outdoor reset control


I read this thread and still don't understand how an outdoor reset can lower the temperature of your boiler water...if the aquastat is set for 160/180....how does the reset prevent it from turning on when the water drops 1o 160?

Maybe this is a related question....why is it called a "reset"?

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