new zone over split heating loop

19 years ago

Problem: I have a dual loop hydronic baseboard zone on my second floor. One of the loops goes through an old addition that is less insulated and could use more heat, and I would like to put it on a its own thermostat. My controller has one extra input, so that is not a problem.

So, my setup is as follows: boiler -> pump -> split -> heating zones -> combine -> boiler

What is best wat to do this? Zone valves? My system does not currently use zone valves. I do have access to one of the splits which happens in a closet above the boiler room. This is on the return side.

I thought about a new pump, but that would be harder to pipe in unless I forced the new pump to pull through the existing zone pump.

THoughts?

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Comments (5)

baymee
19 years ago
I think I would use a zone valve in the closet and possibly a flo-check valve on the other line.
jamesbodell
Original Author
19 years ago
Shouldn't I use 2 zone valves, one for each loop? The pump would circulate water if either or both valves were open.

I figure the valves are like 100.00 each?
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baymee
19 years ago
Yes, use two valves. Look for valves with detachable heads, like a Sparco.
jamesbodell
Original Author
19 years ago
As I understand it, If I used a 3 pole zone valve, then the Thermostat would activate the Zone valve, and when it was open, the Valve "End" switch would start the circulator pump.

Can I just have the Thermostat start the pump and open the zone valve at the same time? I imagine that would be how a 2 pole Zone valve would work.

Reason I ask, I do not have the 3rd zone in my Taco SR502 relay box. I imagine I need to buy a Taco SR503 box but I could get a Taco zone control box instead.

Sound thinking?
baymee
19 years ago
The following wires are all low voltage wires (24 volt), but you will also be working around 110V wires inside the aquastat and also connecting the 110V wires of the transformer. Therefore, a licensed, insured, and experienced electrician should do all this work for you. This is how he should hook everything up:

If you install a Sparco or Taco zone valve, the head can be wired separately as follows: One Tstat wire goes to the #1 terminal of the head. The other Tstat wire goes to one side of a 24 Volt transformer. The other transformer wire goes to the #2 terminal of the head, as well as a wire from one of the T terminals found inside the aquastat. The other wire from the second T terminal inside the aquastat goes to the #3 terminal of the head. This will allow the zone valve head to open, and when it's fully open, the circulator will turn on.

This is how you would hook up one zone valve head or a series of heads without a relay box. I do NOT know how this will work in conjunction with a relay box, so do your homework first. I don't use a relay box with my 3 zone valves.