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post #1 of 7 (permalink) Old 03-24-2015, 01:10 AM Thread Starter
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Oil furnace zone 3 help

Hello,
I went to tie in my 3rd zone today and I found the wiring for the 3rd zone different then the other 2. If you could help me with this I would greatly appreciate it. I am confused as to why the 3rd zone has the 2nd picture tied into it. How do I add the 3rd zone?
Thanks for all and any help....

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post #2 of 7 (permalink) Old 03-24-2015, 01:38 AM
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Re: Oil furnace zone 3 help

I'm guessing the jumpers have to be on there to make it function without the third zone functioning?

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post #3 of 7 (permalink) Old 03-24-2015, 12:32 PM Thread Starter
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Re: Oil furnace zone 3 help

Ok... Do I just remove the jumpers and install the valve wire into that and keep the silver box in it too?
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post #4 of 7 (permalink) Old 03-24-2015, 01:08 PM
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Re: Oil furnace zone 3 help

The silver box is a zone valve. The top 2 position connector is for the thermostat. Do you have a thermostat for zone 3? Currently it is jumpered which means zone 3 will always be turned on.

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post #5 of 7 (permalink) Old 03-24-2015, 01:50 PM
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Re: Oil furnace zone 3 help

No response and I am heading out so I am just going to make a guess.

Zone 1 and 2 are normal heating zones controlled by wall thermostats. Zone 3 as wired is the zone control for domestic hot water. If true and you want to add a 3rd heating zone you will need a bigger control board with at least 4 zones. Again this is just a guess without knowing anything other than what is posted.

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post #6 of 7 (permalink) Old 03-24-2015, 08:25 PM Thread Starter
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Re: Oil furnace zone 3 help

Tundragriz,
Thanks for all the help. The furnace was installed with 3 zones. Zone 1 and 2 were completed for the other levels when they built the house. Zone 3 was untapped and was meant for the basement. I finally got around to plumbing and installing the thermostat, and baseboard heater in the basement. I went to wire in the thermostat and was confused when I saw the zone control valve was wired into zone 3 on the board.
I have added some more pictures.
"I thought" this was the control valve for the domestic hot water.

[img][/img]
Here is what I am calling valve 3.
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post #7 of 7 (permalink) Old 03-24-2015, 10:53 PM
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Re: Oil furnace zone 3 help

In your second set of pictures the top picture is a manual mixing valve, no electric. The silver box is a Honeywell diverting zone valve, bottom picture is a Taco zone control valve. Your control board is a Taco, I don't see any other wires other than zone 3 that would be used for DHW. On newer board versions the farthest right set of contacts (whatever number that may be) is dedicated to priority DHW. If desired it can be set up that if DHW is needed that far right valve will turn on and the others will auto turn off until the DHW is satisfied.

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