Honeywell THM5421R1021 IAQ Equipment Interface Module

Product Information

We make it easy and affordable for professionals and homeowners alike to find discounted air conditioning parts and wholesale heating system supplies. Thinking, I may have a defective unit, I exchanged it -- but now the replacement is doing the same thing. 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. Hardwired is best, I usually do both for no reason really other than the batteries come in the box so I put them in. Our inventory includes everything from air conditioner fan motors, compressor parts for HVAC, HVAC filter replacements, to thermostat components for heating systems.

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. My current Honeywell visionPRO IAQ (TH9421C1004) thermostat is not working as the touchscreen is somewhat dead and unresponsive. You can easily relocate a thermostat or upgrade equipment without running new wires when using this module and a wireless FocusPRO® thermostat. 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.

Then you'll be able to select which homeowners see your logo based on the pricing per household (consumer will not be charged). 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. Operating Temperature Rating -40 to 165 Deg F; Supply Voltage 18 to 30 VAC; Current Rating 1 Amp (Cool), 1 Amp (Heat), 0. It's designed for easy installation and can be used with the THM5421R1012 or THM5421R1021U or THM5421R1021HWREDLINKEQUIPMENTINTERFACEMODULE.

These radio-using devices require wired-power -- 24VAC -- to talk to sensors so I decided to reuse the existing two wires to supply that, with the signaling done wirelessly. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. 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. 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.

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 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. It features three sets of universal IAQ contacts to control humidification, dehumidification and ventilation. 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. 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. 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.