Honeywell THM5421R1021 IAQ Equipment Interface Module

Product Information

Then there is the concern that my installer connected only the batteries and not the readily available 24V wiring.

Hardwired is best, I usually do both for no reason really other than the batteries come in the box so I put them in. Honeywell is the backbone of the HVAC industry, helping to improve the lives of consumers by providing innovative, cutting-edge solutions. 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. Instead of saying it could be powered by either batteries or 24V they should say batteries and/or 24V.

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. Operating Temperature Rating -40 to 165 Deg F; Supply Voltage 18 to 30 VAC; Current Rating 1 Amp (Cool), 1 Amp (Heat), 0. 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.

The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. 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. 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.I suspect it is OK and even preferrable to do so and it sounds like jtrammel has already done this without any problems.

If my 24v goes dead then the furnace isn't going to run anyway even if my thermostat is still functional. 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. With 45,000+ SKUs, Famous Supply specializes in HVAC, plumbing, industrial, building products, and training.We make it easy and affordable for professionals and homeowners alike to find discounted air conditioning parts and wholesale heating system supplies.

When the thermostat tells me to "press Connect on the wireless device", I do press the sole button on the EIM, but nothing happens. This dependable module uses advanced communication protocols that help improve control of the HVAC system. 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. 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. Applications include Gas, oil, electric, heat pump, forced warm air, hot water, steam or gravity systems.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. Right now there are absolutly no wires connected between the stat and the furnace or the equipment interface module. You can easily relocate a thermostat or upgrade equipment without running new wires when using this module and a wireless FocusPRO® thermostat.