S Not used for T4 thermostat. L/A - A Heat Pump fault input (most common case) S O/B Changeover valve Y Compressor contactor (stage 1) AUX - W2 Auxiliary heat (TH4210 only) Y2 Not used for T4 thermostat. E Emergency heat (TH4210 only) G Fan Relay W Heat relay (stage 1) C 24VAC common. For 2 transformer systems, use common wire from cooling.. View and Download Honeywell Home T4 Pro Series manual online. Programmable Thermostat. T4 Pro Series thermostat pdf manual download. Also for: Th4110u2005, Th4210u2002.
T4 Pro . Programmable Thermostat . Installation Instructions . Package Includes: • T4 Pro Thermostat • UWP™ MountingSystem • Honeywell Standard Installation Adapter (J-box adapter) • Honeywell Decorative Cover Plate - Small; size 4-49/64 in x 4-49/64 in x 11/32 in (121 mm x 121 mm x 9 mm) • Screws and anchors • 2 AA Batteries. The Honeywell T4 Pro Programmable Thermostat is a device designed for efficiency and ease of use in managing your home's heating and cooling systems. The installation process and user guide instructions are readily available to ensure a smooth setup. Brand: Honeywell Product: Thermostat Model: T4 Pro Page: 36 Page(s)