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. At Cold Air Central, we pride ourselves on being a trusted authority in the world of HVAC supplies, equipment, and parts.

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. Discover indoor and outdoor LED lighting options from undercabinet to ceiling and vanity, you can trust Bright33 for convenience, quality and value. It's designed for easy installation and can be used with the THM5421R1012 or THM5421R1021U or THM5421R1021HWREDLINKEQUIPMENTINTERFACEMODULE.It looks like we can consider this one complete, so I will lock the thread shortly unless I can help out with anything else. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. Styles from transitional to modern and traditional, you can count on Craft33 cabinets to compliment your clients’ lifestyle and budget.

If my 24v goes dead then the furnace isn't going to run anyway even if my thermostat is still functional. Highly compatible with the Honeywell Prestige IAQ System, the THM5421R1021 module saves you time and money. Thinking, I may have a defective unit, I exchanged it -- but now the replacement is doing the same thing. 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. Hardwired is best, I usually do both for no reason really other than the batteries come in the box so I put them in.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. I want to replace my Honeywell thermostat that is only connected using 3 wires; Red, White and green to a nest thermostat.

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. Honeywell is the backbone of the HVAC industry, helping to improve the lives of consumers by providing innovative, cutting-edge solutions. 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. Right now there are absolutly no wires connected between the stat and the furnace or the equipment interface module. I'm not impressed by honeywell either as I have written to them several times and I never get any responce.However when I checked the thermostat terminals for 24V with my own meter I was still not seeing this voltage. My current Honeywell visionPRO IAQ (TH9421C1004) thermostat is not working as the touchscreen is somewhat dead and unresponsive. Then there is the concern that my installer connected only the batteries and not the readily available 24V wiring. Check with your company admin to get an invite to your company's profile, then create your own account. 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.