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Connecting RTH9585WF to W8900A-C Perfect Climate Comfort Control System

Connecting RTH9585WF to W8900A-C Perfect Climate Comfort Control System

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  #1  
Old 07-20-19, 03:35 PM
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Connecting RTH9585WF to W8900A-C Perfect Climate Comfort Control System

I have an existing W890A-C Perfect Climate Comfort Control System. I am at trying to replace the existing thermostat with a Honeywell RTH9585WF. I have wired up the new thermostat including the C wire. The thermostat is showing the call for the AC but the unit is not responding. Not sure if the additional Comfort Control System is causing the problem or something else.
 

Last edited by bigbtree; 07-20-19 at 05:08 PM. Reason: Initial problem solved but still have follow up issues
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Old 07-21-19, 08:47 AM
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You need to remove the W8900a equipment interface module from the circuit.

The easiest method is often just remove to wire nut R to R, G to G y to Y...
at the module.

Take some pictures before removing any wires and remember to turn off power to the furnace first.
 
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