The Trane RLY01770 (also labeled X55010420170) is a Fan Time Delay Relay engineered for use in HVAC systems to delay fan operation for energy efficiency and improved performance. This OEM relay is crucial in managing blower timing to enhance comfort, reduce humidity spikes, and protect system components during heating or cooling cycles. Key Features Original Trane OEM relay for reliable fan time delay control Ensures accurate blower start/stop timing Enhances system energy efficiency and comfort control Supports multiple Trane models across various HVAC configurations Durable design for long-lasting performance Specifications Part Numbers: RLY01770, X55010420170 Function: Fan Time Delay Relay Application: HVAC fan control Type: Plug-in relay Voltage Load: System-dependent (use with compatible Trane models only) Compatible Models GPNC004ADB2000E, GPND010AAF100F, GPND015ADA1000E, GPND040ADD2000B, GPND025ADC2000AC, GPNC010ADA10000, GPND030ADE2000A, GPNC040AEC1000E, GPNC025ADB10000E, GPND035ADB10000 (List shortened; contact us for full compatibility check) Why Choose This Item Backed by Trane?s reputation for reliability, this fan time delay relay is vital for maintaining efficient and consistent HVAC system performance. It reduces unnecessary wear on components by controlling fan timing precisely. A must-have replacement for technicians and property managers aiming for long-term system health.