Honeywell THM5421R1021 IAQ Equipment Interface Module

Product Information

Ideal for any situation, this device is very lightweight, making it simple to install no matter the situation. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again.

Everything seemed to work fine so as others have stated there is no problem having both the batteries and the 24v connected at the same time. Equipment Interface Module controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system. The Honeywell Prestige 2-Wire IAQ Equipment Interface Module delivers easy, reliable connection to your home HVAC system.I want to replace my Honeywell thermostat that is only connected using 3 wires; Red, White and green to a nest thermostat.

Our old heat-only thermostat had exactly two wires running to it from the boiler room: red and white (connected to the R and W terminals respectively).I suspect most installers and homeowners will be mostly concerned with how to install the equipment properly and less with the engineering details about how the electronics actually work.

When the thermostat tells me to "press Connect on the wireless device", I do press the sole button on the EIM, but nothing happens. Styles from transitional to modern and traditional, you can count on Craft33 cabinets to compliment your clients’ lifestyle and budget. I own a Honeywell VisionPRO thermostat (TH8320R1003) which is used to control my natural gas furnace through an Honeywell Equipment Interface Module (THM5421R1021). If my 24v goes dead then the furnace isn't going to run anyway even if my thermostat is still functional. My current Honeywell visionPRO IAQ (TH9421C1004) thermostat is not working as the touchscreen is somewhat dead and unresponsive.From bathroom and kitchen products to pre-assembled installation kits and behind-the-wall products, you can count on Stream33 for convenience, quality and value. Whether you're in need of HVAC troubleshooting parts for a system that's not cooling, seeking out seasonal HVAC maintenance kits for summer AC repair parts and winter heating system upgrades, or simply looking for the best parts for AC repair and HVAC upgrade kits online, Cold Air Central is your go-to source. With 45,000+ SKUs, Famous Supply specializes in HVAC, plumbing, industrial, building products, and training. Sorry, but I'm new to this forum and I couldn't figure out how to do a post other than to reply to this thread.

With our guidance on how to replace HVAC parts, even the most complex home air conditioning repair parts and DIY heating system repair projects become manageable. These radio-using devices require wired-power -- 24VAC -- to talk to sensors so I decided to reuse the existing two wires to supply that, with the signaling done wirelessly. The Equipment Interface Module controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system.

However when I checked the thermostat terminals for 24V with my own meter I was still not seeing this voltage. This dependable module uses advanced communication protocols that help improve control of the HVAC system.