Posted 20 hours ago

Honeywell THM5421R1021 IAQ Equipment Interface Module

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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). The THM5421R1021 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. Their wide range of offerings include thermostats, zoning solutions, and air purifiers, helping to make living and working environments comfortable and efficient. At Cold Air Central, we pride ourselves on being a trusted authority in the world of HVAC supplies, equipment, and parts.

Check with your company admin to get an invite to your company's profile, then create your own account. 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. As long as I know other installers have conected both the batteries and the 24V at the same time without causing any damage, then for me this issue is laid to rest. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. This lightweight and highly reliable Equipment Interface Module comes with a UPC code of 085267328180.I kept the red wire where it was, but switched the white wire from the W to C-terminal on the thermostat and to the "common" terminal in the boiler room (inside a TACO 406 ZVC).

From mini split systems to room air conditioners and dehumidifiers and registers, you can count on Breeze33 for convenience, quality and value. Still it could well be that this lithium battery keeps the programming intact also and the alkaline batteries power the communications, I don't know. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others.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. Then there is the concern that my installer connected only the batteries and not the readily available 24V wiring. 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. Honeywell's Equipment Interface Module (EIM) THM5421R1021 IAQ was supposed to help there -- hooked up to the TACO 406 ZVC in the boiler room instead of the thermostat, and talking to the thermostat via Honeywell's proprietary RedLink-protocol.

This Module will control 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. This dependable module uses advanced communication protocols that help improve control of the HVAC system. Famous can help you with specifications, product options, design, layout, and coordination of your project from A to Z.

Powered by reliable RedLINK® technology, the Honeywell Home Equipment Interface Module works with up to 3 heat/2 cool pump systems.

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