Need help wiring a Honeywell wifi thermostat

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Old 01-31-16, 03:38 PM
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Need help wiring a Honeywell wifi thermostat

I have a Honeywell rth6580wf thermostat. I ran new thermostat wire(3 wire) red is connected to R white is connected to W. I have an Argo Arm-4p control panel. There are no connectors for the C to get the 24vac to the thermostat. I connected the C (green) to the 24vac terminal on the control panel but the voltage was fluctuating between 17-29V and the display on the thermostat would turn on and off. Any ideas on how to get a steady 24v feed. Do I have to buy an Argo Ir882?
 
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Old 01-31-16, 03:51 PM
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I have the same stat, I had trouble with the voltage, called honeywell, and they said that the new stat did not work well with voltages over 24v, and mine had about 26, so I found one that did not go over 24v, and it works fine. I also hooked it up as a stand alone transformer. You won't have to do that, it was easier for me to do it that way. It is a great stat.
Sid
 
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Old 01-31-16, 04:59 PM
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The common (C) is marked on the control board.

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I find it very odd that Honeywell is telling people that these stats won't work on voltages over 24vac. The system is rarely at 24vac and is more likely to be up around 26-28vac. I haven't seen any voltage problems with these stats. I would consider over 30v to be excessive.
 
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Old 01-31-16, 05:11 PM
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I did connect it to the common but I was not getting 24v the thermostat still had no power.
 
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Old 01-31-16, 05:12 PM
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Then you had the W and R reversed.
 
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Old 01-31-16, 05:15 PM
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So connect the green to C and common and reverse the white and red and I should be all set?
 
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Old 01-31-16, 05:20 PM
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Yes..... the red and white are not interchangeable. The R terminal is 24vac HOT.
 
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Old 01-31-16, 06:07 PM
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"That's Honeywell tech support at it's best.
 
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