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RadioRA 3 Installation Multi-location wiring of Sunnata PRO...

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Multi-location wiring of Sunnata PRO Dimmers & Switches

This article will cover the following topics:

  • How are Lutron Sunnata PRO dimmers & switches different from other Lutron multi-location products?
  • What is the difference between Line Side and Load Side?
  • How do I determine which is the load side location?
  • How to troubleshoot a multi-location wiring issue with Sunnata PRO dimmers & Switches

How are Lutron Sunnata dimmers & switches different from other Lutron multi-location products?

  • Sunnata dimmers & switches have a consistent user interface with their associated companion products.  This means that all the dimmers have touch dimming capability and all devices have a light bar.
  • All devices in the circuit must be replaced.  You cannot use a standard mechanical switch in any location.
  • To provide communication between the main dimmer (RRST-PRO-N) and the companion (RRST-RD) the traveler wires are utilized to provide power and wired communication between the main device and the companions. 
  • All Sunnata PRO Main Dimmers & Switches require a neutral connection and MUST be wired on the Load Side of the switch leg.


What is the difference between Line Side and Load Side?

Line Side:  Device location(s) closest to the source of power in a circuit
Load Side:  Device location closest to the lights (load) in the circuit


EXAMPLE:  4-way circuit with (1) Main Dimmer (RRST-PRO-N) &  (2) Companion Dimmers (RRST-RD)
image.png
NOTES:
  • The Main Dimmer must be in the far right location in order for all devices in the circuit to function correctly
  • The Main Dimmer must have a neutral connection


How do I determine which is the load side location?

Finding which location is load side can be challenging in a retrofit application.  You may have already had to deal with this in the past, so you may have your own approaches.  But, if you need them, here are some tips to get you started: 

  1. Before you remove the old devices, make sure to tag the common wires.  If you do this and follow the wiring diagram, then you have a 50% chance of getting it right the first time and a 100% chance of getting it right the second time. 

  1. For loads with sockets: you can use an incandescent bulb to find the load side.  After you open the circuit breaker, tag common wires, and disconnect the existing devices, screw in an incandescent lamp into the socket.  Using a multimeter, measure the resistance from the tagged wire to neutral in both locations with tagged wires.  One will measure an open circuit (line side).  One will measure the same resistance as the bulb you just screwed in (load side) 

  1. For motor/fan loads: you may measure a short from the tagged wire to neutral on the load side 

 

How to troubleshoot a multi-location wiring issue with Sunnata PRO dimmers & Switches

Sunnata PRO dimmers are capable of providing some diagnostic feedback via the LED's on the front of the device. Here are the LED troubleshooting indicators:

Sunnata PRO Dimmers / Companion Dimmers
 
LEDs StatusTroubleshooting / Resolutionimage.png
LED 1 blinks once -OR- does not blink at power upUnits correctly installed
LEDs 6,8, & 9 Flash once per secondMain dimmer incorrectly wired to load side.  Swap with companion unit
LEDs 1,2, & 4 Flash 3x per secondCompanion dimmer in incorrect location.  Swap with Main unit