Honeywell Home THM5421R1021 Equipment Interface Module 24V (Module) THM5421R1005

Product Description

Honeywell Home THM5421R1021 is an Equipment Interface Module (EIM) that interfaces Prestige IAQ and RedLINK VisionPRO thermostats with HVAC equipment. The module provides multistage control for heat pump and conventional systems, IAQ device contacts, sensor inputs, and RedLINK wireless integration. It operates at 24V and supports manual or automatic changeover for heating and cooling system configurations.

• Controls up to 4 heat/2 cool for heat pump systems and 3 heat/2 cool for conventional systems.
• Includes three universal IAQ contacts for humidification, dehumidification, and ventilation plus four wired sensor or dry contact inputs.
• RedLINK enabled for VisionPRO integration; 24V operation with manual and automatic changeover support.

Product Highlights

Multistage HVAC control, IAQ contact integration, four sensor inputs, RedLINK connectivity for Prestige IAQ and VisionPRO thermostats.

Product Information

Standard Information

• Brand: HONEYWELL HOME
• Manufacturer Part Number: THM5421R1021