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Old 01-19-2010, 10:51 AM   #16
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Boiler outdoor reset control


Is there a particular brand/model I should take a look at? I looked at a Taco 700 series thinking it would hook up to my ZVC, but I don't think they're compatible (I have 1 pump and 4 zone valves vice multiple pumps).

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Old 01-19-2010, 11:02 AM   #17
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Boiler outdoor reset control


The PC700 works with single circulators.
Is your ZV panel, an EXP panel.
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Old 01-19-2010, 11:46 AM   #18
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Boiler outdoor reset control


Hey beenthere,

I'm assuming EXP means it has an expansion slot. I pulled the cover and didn't see an expansion receptacle and "EXP" is not part of the model number of the one I have.

Edit: OK, I just looked and I see that there is a ZVC404-2 and a ZVC-EXP-1. So, it appears that I would need to get the EXP model to use the PC700. Might have to swap that out this summer...
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Old 01-19-2010, 12:19 PM   #19
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Boiler outdoor reset control


Or use a different outdoor reset control.
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Old 01-19-2010, 12:28 PM   #20
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Boiler outdoor reset control


Quote:
Originally Posted by beenthere View Post
Or use a different outdoor reset control.

Is there one in particular that you like?
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Old 01-19-2010, 12:33 PM   #21
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Boiler outdoor reset control


I prefer the Weil McLain BCP.
But use the Tekmar at times also. Both are good reset controls.
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Old 01-19-2010, 02:23 PM   #22
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Boiler outdoor reset control


I just took a look at the Tekmar 256 Reset Control. It appears that it would get wired between the ZVC and the boiler. ZVC end switch connects to the 256 boiler demand and the 256 TT terminals wire to the boiler TT terminals (does that sound right?).

So, if that's the case, I don't think I understand how the reset control works to control the boiler water temp. When the boiler gets a demand signal, it starts the pump and fires the boiler, water temp is set by an internal boiler circuit. No? How does a simple open/closed 2 wire signal remove the demand signal for fire, but keep the pump running?
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Old 01-19-2010, 03:00 PM   #23
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Boiler outdoor reset control


The Tekmar monitors boiler temp. And will drop the call for heat to the boiler when the water temp reaches the reset temp the Tekmar determines is correct.
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Old 01-19-2010, 04:01 PM   #24
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Boiler outdoor reset control


Quote:
Originally Posted by beenthere View Post
The Tekmar monitors boiler temp. And will drop the call for heat to the boiler when the water temp reaches the reset temp the Tekmar determines is correct.
But then won't the pump quit running too?
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Old 01-19-2010, 04:16 PM   #25
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Boiler outdoor reset control


Is your ZVC panel controlling the circ. or is teh boilers aquastat.
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Old 01-19-2010, 05:18 PM   #26
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Boiler outdoor reset control


You can use the Taco PC700 without having to have the zone control relay (sr or ZR series)

Tekmar makes the PC700 for taco.
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Old 01-20-2010, 06:34 AM   #27
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Boiler outdoor reset control


Quote:
Originally Posted by beenthere View Post
Is your ZVC panel controlling the circ. or is teh boilers aquastat.
The end switch from the ZVC is connected to the boiler (I believe boiler TT). If my system understanding is correct, that would mean that the boiler aquastat is controlling the circ.
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Old 01-20-2010, 06:39 AM   #28
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Boiler outdoor reset control


Circ just needs rewired to the ZVC to control it then.

Where there is a will there is a way.
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Old 01-20-2010, 07:58 AM   #29
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Boiler outdoor reset control


OK. I'll take a look at the wiring schematic in the boiler manual tonight. Maybe I'll post a picture of the actual wiring. Thanks
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Old 01-20-2010, 04:36 PM   #30
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Boiler outdoor reset control


Well, from what I see, there are 5 terminals:

W G Y R C

The end switch from the ZVC connects to G & R. W has nothing connected to it. G has a blue wire. Y has a yellow and an orange that looks like it goes to the aquastat. C has 2 yellows and R has a red and a dark blue.

I looked at the manual, but I didn't do too well in determining what each wire is supposed to do, so I added a picture.
Attached Thumbnails
Boiler outdoor reset control-100_0818.jpg  

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