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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. When the thermostat tells me to "press Connect on the wireless device", I do press the sole button on the EIM, but nothing happens. My new thermostat booted and I was able to pair it with an in-house and an outside sensors with ease.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. Then you'll be able to select which homeowners see your logo based on the pricing per household (consumer will not be charged). Operating Temperature Rating -40 to 165 Deg F; Supply Voltage 18 to 30 VAC; Current Rating 1 Amp (Cool), 1 Amp (Heat), 0.

It features three sets of universal IAQ contacts to control humidification, dehumidification and ventilation. 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. The Honeywell Prestige 2-Wire IAQ Equipment Interface Module is an essential part of the home HVAC system.I want to replace my Honeywell thermostat that is only connected using 3 wires; Red, White and green to a nest thermostat. If you have any problems with the registration process or your account login, please contact support.

Right now there are absolutly no wires connected between the stat and the furnace or the equipment interface module. We sell into the residential, commercial and industrial market segments for new construction, replacement, repair, remodel, parts and service. 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.

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. 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). I own a Honeywell VisionPRO thermostat (TH8320R1003) which is used to control my natural gas furnace through an Honeywell Equipment Interface Module (THM5421R1021).