Honeywell Home RedLINK

RedLINK connects compatible Honeywell Home thermostats to equipment controls and wireless accessories. Start with the thermostat family and its equipment connection, then select the sensing and remote-access functions your installation needs.

Prestige IAQ

The YTHX9421R5085WW Prestige IAQ kit contains a THX9421R5021WW thermostat, a THM5421R1021 equipment interface module and two duct sensors. The thermostat receives wired power and communicates with the equipment module over RedLINK. This family supports residential and light-commercial configurations, including equipment-dependent humidity and ventilation control.

The interface module is already included in this kit. The separately listed THM5421R1021 is useful when sourcing an interface independently; it is not an additional required purchase for the kit. The Internet gateway and wireless room/outdoor sensors are optional additions, not included in this kit number.

VisionPRO 8000 with RedLINK

Choose from TH8110R1008, TH8320R1003 and TH8321R1001. Match the exact model's staging and IAQ functions to the equipment.

These thermostats can control equipment through their own wiring or use a compatible equipment interface module. With an EIM, the equipment connections move to that module and the thermostat's relays are inactive. An EIM is therefore a configuration choice, not a universal requirement for every VisionPRO installation.

Wireless FocusPRO

The TH6320R1004 is a battery-powered wireless thermostat that needs an equipment-side control. Its original installation documentation specifies a THM5320R1000 interface for non-zoned systems, or an HZ322/HZ432 TrueZONE panel with a THM4000R1000 wireless adapter for zoning. Those components are not currently listed here.

The newer THM5421R1021 installation guide also covers Wireless FocusPRO, with different sensor restrictions. Confirm the installed hardware and applicable guide before choosing that combination. The C7189R1004 wireless indoor sensor is not a FocusPRO accessory in that guide.

Sensors and remote access

• C7189R1004 indoor sensor: remote temperature and humidity sensing for the documented Prestige IAQ and VisionPRO RedLINK configurations.
• C7089R1013 outdoor sensor: outdoor sensing for compatible RedLINK systems; available control functions depend on the thermostat setup.
• REM5000R1001 Portable Comfort Control: a portable interface for supported system functions.
• THM6000R7001 Internet Gateway: connects a compatible RedLINK installation to an Internet-connected router using Ethernet. Remote access requires account registration. It does not replace an equipment interface module.

Plan an installation or replacement

Record the thermostat, interface, zone-panel and accessory model numbers, plus equipment stages and the desired sensing locations. RedLINK family membership does not establish compatibility with every RedLINK generation or Wi-Fi thermostat. Request a project review for an equipment-specific selection.

Manufacturer documentation

• Prestige IAQ product data and kit contents (PDF)
• VisionPRO RedLINK product data and accessories (PDF)
• THM5421R1021 installation and FocusPRO restrictions (PDF)
• Wireless FocusPRO installation guide (PDF)