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. 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 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. All this and much more is available to you absolutely free when you register; for an account, so join our community today today! Powered by reliable RedLINK® technology, the Honeywell Home Equipment Interface Module works with up to 3 heat/2 cool pump systems.

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. I'm not impressed by honeywell either as I have written to them several times and I never get any responce. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others.

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. I suspect it is OK and even preferrable to do so and it sounds like jtrammel has already done this without any problems. However when I checked the thermostat terminals for 24V with my own meter I was still not seeing this voltage.

Styles from transitional to modern and traditional, you can count on Craft33 cabinets to compliment your clients’ lifestyle and budget. With 31 Famous Supply locations in Ohio, western Pennsylvania, and West Virginia, your local Famous counter has everything you need to help you get your project done.

They are also powering the totally wireless communication betweem my stat and the furnace via the equipment interface module which is in turn hard wired to the furnace. Right now there are absolutly no wires connected between the stat and the furnace or the equipment interface module.