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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 own a Honeywell VisionPRO thermostat (TH8320R1003) which is used to control my natural gas furnace through an Honeywell Equipment Interface Module (THM5421R1021). Gas, Oil, Electric, Heat Pump, Forced Warm Air, Hot Water, Steam Or Gravity Application, Up To 3 Heat 2 Cool Heat Pump Or Up To 2 Heat 2 Cool Conventional Stages, For Use With Wireless FocusPRO Thermostats. Sorry, but I'm new to this forum and I couldn't figure out how to do a post other than to reply to this thread.My current Honeywell visionPRO IAQ (TH9421C1004) thermostat is not working as the touchscreen is somewhat dead and unresponsive. Famous can help you with specifications, product options, design, layout, and coordination of your project from A to Z. 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.

These facts led me to worry that connecting both at the same time might be incorrect and damage my stat. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Honeywell is the backbone of the HVAC industry, helping to improve the lives of consumers by providing innovative, cutting-edge solutions. 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. Personally, I find the engineering oriented information interesting but sometimes it can be frustrating and confusing when the primary focus is simply how you need to connect the equipment together.

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. We make it easy and affordable for professionals and homeowners alike to find discounted air conditioning parts and wholesale heating system supplies. My current setup behind the thermostat wall, there are 5 wires but only 3 are used by Honeywell thermostat (label as 1,2,3).

The THM5421R1021 interface module streamlines the performance of the system helping clients reduce energy costs. If you have any problems with the registration process or your account login, please contact support. 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. Operating Temperature Rating -40 to 165 Deg F; Supply Voltage 18 to 30 VAC; Current Rating 1 Amp (Cool), 1 Amp (Heat), 0. Applications include Gas, oil, electric, heat pump, forced warm air, hot water, steam or gravity systems. 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). 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).

Right now there are absolutly no wires connected between the stat and the furnace or the equipment interface module. 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.

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. 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. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. When you purchase through links on our site, we may earn an affiliate commission, which supports our community.