The zone consists of two rooms with different temperatures in them, so we wanted to replace it with a thermostat capable of taking a reading from a remote sensor. Highly compatible with the Honeywell Prestige IAQ System, the THM5421R1021 module saves you time and money.

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

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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 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).

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. 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 suspect it is OK and even preferrable to do so and it sounds like jtrammel has already done this without any problems.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). At Cold Air Central, we pride ourselves on being a trusted authority in the world of HVAC supplies, equipment, and parts. These facts led me to worry that connecting both at the same time might be incorrect and damage my stat. 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. Honeywell is the backbone of the HVAC industry, helping to improve the lives of consumers by providing innovative, cutting-edge solutions.