Programmable Honeywell Vision PRO IAQ Touchscreen Thermostat Kit

VisionPRO IAQ Programmable Thermostat Kit w/ EIM


Brand: Honeywell

Mfr Part#: YTH9421C1002

UPC#: 085267273053

Availability: In Stock
Usually ships: Today, if ordered by 3pm
Qty Price
$185.95 / each
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Honeywell Vision PRO IAQ Thermostat Kit (sku# YTH9421C1002) Total Home Comfort System with Temperature, Humidification, Dehumidification and Ventilation Control

The Honeywell YTH9421C1002 includes TH9421C1004 Vision PRO IAQ Touchscreen Thermostat, that features 7 day programming and is designed for Up to 3 Heat/2 Cool Conventional Systems and Up to 4 Heat/2 Cool Heat Pumps.

All HVAC equipment of the Honeywell YTH9421C1002 is wired to the THM5421C1008 Equipment Interface Module. This Module receives communication from the wireless devices.




  • Advanced dual-fuel control;
  • Three wires to the living space allows for easy equipment upgrade without having to run additional thermostat wire;
  • Thermostat connects with Equipment Interface Module or EnviraZONE panel to control temperature, humidification, dehumidification and ventilation from a single point in the home;
  • Automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork;
  • Removes air pollutants by exchanging the stale air in a house with fresh, filtered air better than having an open window;
  • Includes: Honeywell TH9421C1004 Vision PRO IAQ Thermostat;
  • Includes: Honeywell THM5421C1008 Equipment Interface Module;


Technical Specifications of Honeywell YTH9421C1002:

  • Application: Heat/Cool or Heat Pump with Auxiliary Heat;
  • 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, C, R, Rc, Rh, R, W1-O/B, W2-Aux, W3-Aux2, Y, Y2, G, L, Out1, Out2, In1, In2, Dats1, Dats2, Hum1, Hum2, Dhm1, Dhm2, Vnt1, Vnt2;
  • Dimensions: 4 9/16" high x 6" wide x 1 1/4" deep;
  • Mounting: Horizontal;
  • Electrical Ratings: THM5421 is rated 20 to 30 Vac;
  • Setting Temperature Range: Heat: 40F to 90F; Cool: 60F to 99F;
  • Differential Temperature: +/- 1F;
  • 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;
  • Heat Current: 1.0 A running;
  • Cool Current: 1.0 A running;
  • Fan Current: 0.6A running;
  • 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.;
  • Humidification Setting Range: 10 to 60% RH.;
  • Dehumidification Setting Range: 40 to 80% RH.;
  • Voltage: 20 to 30 Vac;
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