In further reverse engineering the system I determined that the Solar heat actuator does in fact go to active (red LED) once a certain temperature threshold is reached at the solar panels (temp as of yet unknown). Now that I have had a chance to work with the system during the peak of the day the solar actuator does in fact go to active and actuates the JVA as expected. In case anyone else is ever curious about this there are a couple things of note:

- terminals 3 and 4 on the green terminal bar in the power center are where the solar panel temp sensor connects. As a troubleshooting step you can connect a 2k ohm resistor (3 red bars) to these terminals instead of the temp sensor to test if the actuator works from the controller. With the 2k ohm resistor connected the solar button works as an on/off switch without regard to the temp reading so long as the pool pump is active.

- If you want to check the temp reading of the solar temp sensor connected to terminal 3 and 4 you can toggle dip switch #5 to ON according to the programming manual. I did not try this, but it could be a good troubleshooting step if you think your sensor reading may be incorrect.

- On the 6700 REV C version that I have there is no solar priority programming as is the case with newer revisions of the RS. This can become a problem for those that have a single pump for spa/pool because if solar is active then the water still pumps through the panels. In my case I programmed my solar to activate at the same time as my pool pump, but if you want to use your spa during this same time you have to manually disable the solar heat if you do not want to pump through the solar panels.

These notes only apply to the Jandy Aqualink RS 6700 REV C. Newer versions have additional options. I hope that my efforts can help someone else to avoid spending so much time to figure this out.

Paul