Low voltage, thermostat & Fan Control device for HVAC wiring help


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Old 11-22-13, 06:28 AM
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Low voltage, thermostat & Fan Control device for HVAC wiring help

My house has older thermostats and two hydro-air fan coil units for both heat (Oil fired H.W.) and A/C (condensers outside). FCU has 4 wires coming out and being used.

I'm assuming Red is common, White is heat, Green is fan, Brown is A/C. Here's the current wiring schematic.


I've decided to join the 21st century with touch screen, programmable thermostats. Specifically, the Honeywell WIFI 9000. Here's what I bought.
Honeywell Wi-Fi Smart Thermostat-RTH9580WF at The Home Depot

I've also purchased new Hydro-Air Fan Control's. I always had to play with the aquastat on the FCU's and could never get them tuned properly. I would always have false calls for heat and often had the fan coils blowing cold air at the end of each cycle. I purchased these guys to help solve the problem.
http://s3.pexsupply.com/product_files/Taco - HAFC201-4 - Install Instructions.pdf

I think I have the wiring figured out. Any thoughts?
 
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Old 11-22-13, 06:54 AM
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I have moved you over to the Thermostat Forum.
 
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Old 11-22-13, 04:32 PM
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The wiring doesn't look right.

What is the switching relay doing..... hanging out ?
It would need at least three or four wires to be doing something.
 
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Old 11-22-13, 05:01 PM
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It's a SR506 switching relay wired to the respective zone terminals
 
 

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