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Need to replace: Flair RTU 100b connected to White-Rodgers 3 wire zone valves
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coskier
Member Posts: 9
I have a 3 zone boiler/ radiant heat system in my home. The zone valves are White-Rodgers Type 1311-102, 3 wire valves. These are wired into a Flair RTU 100b relay/ transformer that is failing. Had a heating guy come out, and he said that he has to either:
a) pull the 3 wire valves and replace them with 2 wire ones;
b) run an individual relay to each valve.
Either option is going to cost me more than I think it should. For the life of me, I cannot believe that there isn't a suitable replacement for the Flair RTU 100b out there that can work with my boiler and my existing valves.
Any thoughts/ ideas I should be looking at? (I am completely new to this.)
Thank you.
a) pull the 3 wire valves and replace them with 2 wire ones;
b) run an individual relay to each valve.
Either option is going to cost me more than I think it should. For the life of me, I cannot believe that there isn't a suitable replacement for the Flair RTU 100b out there that can work with my boiler and my existing valves.
Any thoughts/ ideas I should be looking at? (I am completely new to this.)
Thank you.
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Edited, and thank you.0
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I would think either the Taco ZVC-403 or the Caleffi ZVR103 would work. Both will work with 3-wire zone valves.8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
Alan - do those have transformers in them? I think that is part of what made the Flair unique. And it is not manufactured anymore.0
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Yes, they both do. Personally, I like the Caleffi because it has more options and the transformer is easily replaced if it goes bad.8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab0 -
I asked the tech about these, and his response was that the zone valves are three wires, but the thermostats are only two - powered open/ powered closed - so those two don't work...0
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Here is how various 3 wire ZVs wire to Caleffi zone relays. Any thermostat should work, standard 2 wire, power stealing or new wiFi types.
If you have a valve that requires power to open and power to close, wire a RIB relay to the ZV output. That will allow power both open and close.Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream1 -
What is a RIB relay? They just need a spdt relay with a 24v coil, right(one per zone)?0
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Yes any DT relay. The RIB screws into one of the knockouts on a relay box and makes the wiring clean. They are very affordable also💵mattmia2 said:What is a RIB relay? They just need a spdt relay with a 24v coil, right(one per zone)?
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream2 -
Thank you Bob, that is helpful.0
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Can the heads/ actuators of the 1311's be replaced without draining the system? Is a WR 1361 the suitable replacement?
Would that make more sense than keeping the actuators and adding relays to each valve? Assuming the Taco or Caleffi gets installed, of course.0 -
I don't think either valve is power-open, power-closed.
https://s3.amazonaws.com/s3.supplyhouse.com/product_files/White Rodgers - 1361-102 - Wiring Guide.pdf8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab1 -
I don’t know what power on/ off means, but here is the manual for the 1311. https://www.engineeredair.com/parts/M63T48811.pdf
It also looks like the third valve is a precursor, the Dayton 2E1640 -
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I would certainly prefer to just change the zone controller. I don't know how to read the product manual to tell if the valves are power open and close though.0
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From what I could read of the very confusingly written data sheet for the actuator, it appears to be power close.
Looking at the price of the actuator for those valves compared to a relay, if there are more than 2 or 3 it could get very pricey very quickly. It still would be a cleaner job, but might not be wort the extra cost, I had no idea the actuator for that valve would essentially cost the same as the valve.1 -
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Yes, it looks like power open/close.
If you choose to keep the zone valves, you will have to do something like this:
You can use the transformer in the zone valve control to power the zone valves.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab1 -
Thanks for all of the input everyone. I have a path to go down now (and I have learned a few things).0
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