Lutron Palladiom Thermostat Split System Control

Introduction

This application note from Lutron provides essential guidance on the design, wiring, commissioning, and testing of the Lutron Palladiom Thermostat solution when used with split (also known as “Dual”) HVAC systems. This system allows for the control of one heating source and one cooling source, with specific exceptions noted for conventional systems or heat pumps with auxiliary forced-air heating.

The document details compatible system configurations, including radiant floor heating and VRF cooling, and outlines the necessary controllers and interfaces, such as the Lutron HVAC Controller (SMC55-RESI-2) and CoolAutomation interfaces. It also addresses important considerations like integration control, temperature sensing limitations, and the absence of an Auto mode for split systems. Specific instructions are provided for addressing controllers and interfaces, as well as for the commissioning process within the HomeWorks system.

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Key Features and Considerations

• Supports split (Dual) HVAC system control with one heating and one cooling source.
• Details compatible heating and cooling system types (e.g., radiant floor, VRF, FCU, conventional).
• Outlines required controllers and interfaces (Lutron SMC55-RESI-2, CoolAutomation CoolPlug, Mitsubishi A1M, LG PDRYCB500).
• Explains integration control and temperature sensing limitations.
• Provides step-by-step instructions for installation, wiring, addressing, and commissioning.
• Includes troubleshooting guidance for common issues.