The Jandy 2.0 HP Variable Speed Pump (VS pump) has a built in Auxiliary Relay which can be used to control a secondary device as long as it does not exceed 11 Amps. This is ideal for a Salt Water System or Booster Pump and this is a great way to control another piece of equipment through the VS pump. The Jandy VS pumps not connected to an automated system requires a separate controller and I prefer the Jandy iQPUMP01 interface over the older JEP-R controller.
How the AUX Relay works is that you would wire the device power source according to the manual as a shared power source. A licensed electrician or licensed pool service technician should do this for you. Once the device is connected to the AUX Relay on the pump you can control that device by simply setting a higher RPM that will activate the AUX Relay. Any RPM above 1725 RPM will give power to the AUX Relay and activate the secondary device (Salt System or Booster Pump). So if you set your VS pump to run at 1400 RPM for 8 hours per day and set a program at 2100 RPM for two hours the Booster Pump or Salt System will then turn on.
This is a great way to insure that your Salt System will only be running when there is enough flow to the cell to generate chlorine. If you run your salt system with to little flow it can cause damage to the system. The same goes with a Pressure Side Cleaner Booster Pump. Many times I have stopped by a service account where the Booster Pump is running when the main circulation pump is off. Over time the Booster Pump will burn out. It is designed to only run when the main circulation pump is running. So by wiring either of these to the AUX Relay on the Jandy 2.0 HP VS pump, you are insuring safe operation of the device.
The Jandy TruClear Salt System shown in the video uses only 1 amp of power. It can easily be connected to the AUX Relay as it is well below the 11 amp limit. A Polaris Booster Pump gives off about 6 amps when connected as a 230V device. This also is safe to connect to the AUX Relay on the pump. I wouldn't connect another full size pump or anything that gives off more than 11 amps of power, otherwise the GFI will likely trip. But a Salt System or Polaris Booster Pump can safely be connected.
If you have any questions as far as wiring configurations you can call Jandy Tech Support directly. Every pool system is set up differently so wiring configurations may vary. The manual of the Jandy VS pump shows some accepted wiring configurations that you can use. You can see the manuals here:
Jandy FloPro VS Pump (page 14):
So the AUX Relay on the Jandy 2.0 HP Pumps is a great way to power a secondary device and control it with the iQPUMP01 by setting the pump RPM at a threshold above 1725 RPM. It is like instant automation of the secondary device. If you are using it with a booster pump then there is no need for a secondary timer or time clock. This makes for a very clean and convenient install of secondary equipment.
Jandy iQPUMP01: Instant Pump Automation for your Jandy Variable Speed Pump: https://youtu.be/ZAvvAccTBig
How to Install a Jandy JEP-R Variable Speed Pump Controller: https://youtu.be/zLlms0KrwPQ
How To Program a Jandy JEP-R Variable Speed Pump Controller: https://youtu.be/zI9KgUfYpjE
Benefits of a Variable Speed Pump: https://youtu.be/7PdZTDadZKI
Jandy VS FloPro 1.0 HP Pump Installation Part 3: Wiring the Pump: https://youtu.be/RpEXyIdDkK0
Jandy VS FloPro 1.0 HP Variable Speed Pump Installation Part One: Unboxing and Walk Thru: https://youtu.be/qjr2EB2kBMo
Jandy VS FloPro 1.0 HP Variable Speed Pump Installation Part 2: Plumbing: https://youtu.be/EvbJVQvmNBo
Easiest Way to Save Thousands of Dollars on your Pool Cost - Install a Variable Speed Pump!: https://youtu.be/Zt2wOfae88I
Jandy Pro Series TruClear Salt Water System Overview Video: https://youtu.be/sGGXD6m4uCs
Jandy Pro Series TruClear Salt System Control Panel Walk Thru Video: https://youtu.be/Uxs1ePPC0ZQ