Wiring a Two Wire Zone Valve

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JeepinPete
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Stoker Coal Boiler: EFM
Coal Size/Type: Rice
Stove/Furnace Make: EFM
Stove/Furnace Model: Highboy
Location: Quakertown PA

Post Tue. Oct. 08, 2013 5:24 pm

Can someone clue me in here. I am using a hydronic distribution assembly for my system, and it has the option of 2 wire zone valves. I'd like to add these to system so that I can add a thermostat to each floor (three in total). I've wired up the Taco 3 wire valves before, but I am not certain how to get the boiler and the circulator to kick on with this type of valve. So before I do something stupid, I am asking for someone to point me in the right direction.

Pete

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Rob R.
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Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Tue. Oct. 08, 2013 6:28 pm

Pete, Taco makes a nice relay box that allows for 2-wire zone valves and circulator/stoker operation. You could do the same thing with a 24v power supply, thermostats, and relays, but that green Taco box on the wall is tough to beat for simplicity.

http://www.pexsupply.com/Taco-ZVC403-4-3-Zone-Val ... h-Priority?/

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lsayre
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Post Tue. Oct. 08, 2013 7:41 pm

The 4 zone valve version of this Taco unit sure made my zone valve and circulator wiring job easy!
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.


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dave brode
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Stoker Coal Boiler: Keystoker KAA-2
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Location: Frostburg, Maryland [western]

Post Tue. Oct. 08, 2013 10:30 pm

On the subject,

No control man here, but could he use zone valves with isolated end switches [end switch terminals on each zone valve run back to "TT" on circulator controller?

The 8124 triple 'stat on my boiler has "TT" terminals, jump those close the connection w/a thermostat of end switch from a zone valve and the pump and stoker run. I've seen those pricey zone valve controllers, but are they really needed?

Dave
I love my Kaa-2. It replaced a small 5 section Red Square, and Iron Fireman, burned bituminous for 20 yr.

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Rob R.
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Posts: 11343
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Wed. Oct. 09, 2013 5:07 am

He specifically asked about the two wire units. I have Honeywell's on my system that have an end switch, and I have it hooked up just like Dave said.

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dave brode
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Joined: Fri. Jan. 15, 2010 5:47 pm
Stoker Coal Boiler: Keystoker KAA-2
Hand Fed Coal Boiler: used to have a 5 section Red Square
Coal Size/Type: rice anthracite
Location: Frostburg, Maryland [western]

Post Thu. Oct. 10, 2013 9:13 pm

There are "2 wire" zone valves [2 wires, or, terminals]: 2 wires, operate the valve, nothing else. The valves that I mentioned are actually 4 wire, with 2 from an isolated end switch going to TT etc.

Afaik, there are 3 wire valves actually operate like those with 4 wires and an end switch. Those are usually wired with more than one circuit sharing a terminal. I have a bit of gray matter deficit, so I have a hard time understanding this, but.....

http://www.houseneeds.com/upload/pdf/taco-zoneval ... iescat.pdf

I'm about to wire up a 24v "3 wire" Taco and a 24v "4 wire" honeywell, both will have a pair going back to "TT". Wish me luck. LOL

Dave

Fwiw, some other wiring info;

http://s3.pexsupply.com/manuals/1283431653990/386 ... D_FILE.pdf
http://s3.pexsupply.com/manuals/1350288596772/824 ... D_FILE.pdf
I love my Kaa-2. It replaced a small 5 section Red Square, and Iron Fireman, burned bituminous for 20 yr.


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ntp71
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Hand Fed Coal Boiler: Reading Foundry Water Heater
Hot Air Coal Stoker Stove: Old Mill Mini Stoker with Keystoker Feed System
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Location: Nanticoke, PA

Post Mon. Oct. 14, 2013 11:39 am

Just adding my $0.02 here.

A few years ago I wired up two zone valves having two separate thermostats to my one furnace. I pretty much used the wiring diagram on the taco box to do this. My buddy insisted I need some type of controller to do this, however all I need was a transformer and a terminal board and my set up looks and works great.

Neal
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2013-10-12_11-36-26_430.jpg
Taco wiring

JeepinPete
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Joined: Fri. Mar. 04, 2011 6:29 pm
Stoker Coal Boiler: EFM
Coal Size/Type: Rice
Stove/Furnace Make: EFM
Stove/Furnace Model: Highboy
Location: Quakertown PA

Post Wed. Oct. 16, 2013 1:44 pm

Thanks guys, I suspected I was going to need another box. I am sure I could rig up something, but the install is actually looking pretty decent :D

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