The Honeywell TH9421C1004 VisionPRO IAQ touchscreen universal programmable thermostat provides electronic control of 24 Vac heating and cooling systems in addition to humidification, dehumidification and ventilation all with just 3 wires to the thermostat.

Features

The Honeywell TH9421C1004 offers advanced dual-fuel control.
Three wires to the living space allows for easy equipment upgrade without having to run additional thermostat wire. The Thermostat connects with Equipment Interface Module or EnviraZONE panel to control temperature, humidification, dehumidification and ventilation from a single point in the home. The TH9421C1004 automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork. It also removes air pollutants by exchanging the stale air in a house with fresh, filtered air better than having an open window.

Product Specifications
Application Conventional and Heat Pump systems Programmability 7 Day Multiple Day Programming or Non-Programmable Changeover Auto/Manual Selectable Color Premier White® Switch Positions (System) HEAT-OFF-COOL-AUTO-EM.HEAT Switch Positions (Fan) AUTO-ON-CIRC Power Method Communicating Terminal Designations 1, 2, 3 Dimensions (in.) 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep Dimensions (mm) 116 mm high x 152 mm wide x 32 mm deep Mounting Horizontal Electrical Ratings THM5421 is rated 20 to 30 Vac Setting Temperature Range (F) Heat: 40 F to 90 F; Cool 60 F to 99F Setting Temperature Range (C) Heat: 4.5 C to 32 C; Cool: 15 C to 37C Differential Temperature (F) ± 1 F Differential Temperature (C) ±0.5 C Stages Up to 4 Heat/2 Cool Heat Pump Stages Up to 3 Heat/2 Cool Conventional Outdoor Sensor Yes, optional Discharge Sensor Yes, optional Remote Sensor Yes, optional Sensor Element Thermistor Operating Humidity Range (% RH) 5 to 90% RH, non-condensing Comments Includes Humidification Control with or without Frost Protection, Dehumidification using Whole House Dehumidifier or Air Conditioning with High or Low speed fan, Advanced Patented Ventilation Control and Advanced Dual Fuel Heat Pump Control. Used With THM5421C1008 Equipment Interface Module Display Size 10 sq. in. Humidification Setting Range 10 to 60% RH. Dehumidification Setting Range 40 to 80% RH. Voltage 20 to 30 Vac