While technically compatible with certain Coleman and Evcon furnaces

The Siemens QAC2012U is a professional-grade 1000 ohm platinum RTD outdoor temperature sensor designed for demanding building automation systems (BAS) and HVAC operations

It means the relay has one common input and two possible outputs (NO and NC)

By utilizing genuine OEM Trane parts

specific local codes may require a vent limiting device (such as the 12A04 or 12A06) for indoor installations to eliminate the need for a dedicated vent line to the outdoors

Belimo ZG-103 Bracket While technically compatible with certainThe Belimo ZG 103 is a heavy duty universal right angle bracket engineered for specialized applications where a damper shaft is inaccessible or a standard direct mount configuration is not feasible. Constructed from 12 gauge galvanized steel, this actuator mounting bracket provides a rigid, vibration resistant foundation for high torque applications. Its versatile hole pattern is specifically designed to accommodate Belimo GM, AM, and NM series