Riello RS485 connections

The Riello heat pumps have the RS485 connections within the indoor controller.

In the Riello indoor controller make the following RS485 Modbus connections:

Riello in the middle of the RS485 cable run	Riello at the end of the RS485 cable run
Guidance Connect both screened drain wires together, insulate and carefully locate it at the edge of the PCB to reduce the chance of a short-circuit.  RS485 termination within the Passiv Programmer (see the Installation guide page 9)	Guidance Do NOT use the RS485 termination within the Passiv Programmer (see the Installation guide page 9)

If installing the Passiv Smart Thermostat using relay control, please follow the guidance in this article.