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How to integrate the INSTEON VenStar thermostat adapter
The wireless adapter is a 4-wire connection that uses an RJ-11 interface.
What I did was to remove the RJ-11 wiring from the wireless adapter and save it in case I need to restore it later. Then I removed the RJ-11 jack from the thermostat board using hot air. Then you will need to use 4 wires to connect the boards and secure the wireless adapter board inside the thermostat using double-sided tape or hot glue and making sure the back of the wireless board is insulated so as to not cause any electrical shorts.
The pads on the wireless board are labeled JP1-JP4. These connect to the thermostat board from left to right (when viewed as shown below, JP1=black) and are laid out on the board in the following staggered pattern:
You should end up with something looking like this:
You can discuss this modification on the CocoonTech.com forums.