Honeywell THM5421R1021 IAQ Equipment Interface Module

Product Information

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. The Honeywell Prestige 2-Wire IAQ Equipment Interface Module delivers easy, reliable connection to your home HVAC system. It's designed for easy installation and can be used with the THM5421R1012 or THM5421R1021U or THM5421R1021HWREDLINKEQUIPMENTINTERFACEMODULE. These facts led me to worry that connecting both at the same time might be incorrect and damage my stat.

When the thermostat tells me to "press Connect on the wireless device", I do press the sole button on the EIM, but nothing happens. 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. With 45,000+ SKUs, Famous Supply specializes in HVAC, plumbing, industrial, building products, and training. The THM5421R1021 interface module streamlines the performance of the system helping clients reduce energy costs.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. Cold Air Central is a HVAC and refrigeration supply company providing a wide range of supplies for HVAC installers, HVAC contractors, and HVAC company repair person and as well as local, state and federal government. This statement makes me think that both the 24VAC and the batteries can be connected at the same time because of the backup reference, but I'm not sure. We sell into the residential, commercial and industrial market segments for new construction, replacement, repair, remodel, parts and service.

It features three sets of universal IAQ contacts to control humidification, dehumidification and ventilation. Honeywell is the backbone of the HVAC industry, helping to improve the lives of consumers by providing innovative, cutting-edge solutions. The cooling and heating work fine when I am able to turn it ON or OFF only when the touchscreen is responding to my action/input. 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. 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.We make it easy and affordable for professionals and homeowners alike to find discounted air conditioning parts and wholesale heating system supplies. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice.

To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy.The Honeywell Prestige 2-Wire IAQ Equipment Interface Module is an essential part of the home HVAC system. I own a Honeywell VisionPRO thermostat (TH8320R1003) which is used to control my natural gas furnace through an Honeywell Equipment Interface Module (THM5421R1021). Right now there are absolutly no wires connected between the stat and the furnace or the equipment interface module.

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. I want to replace my Honeywell thermostat that is only connected using 3 wires; Red, White and green to a nest thermostat.

When you purchase through links on our site, we may earn an affiliate commission, which supports our community. This dependable module uses advanced communication protocols that help improve control of the HVAC system. 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. The thing I don't like is that the manual uses the OR word when it describes powering up the stat using the 24V wiring or the 6V (4 X 1. If you have any problems with the registration process or your account login, please contact support.