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Honeywell YTH9421C1010 - VisionPRO® IAQ Touchscreen Universal Programmable Thermostat 4H/2C with Auto or Manual Changeover

Item: YTH9421C1010
MFR: YTH9421C1010/U
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VisionPRO Indoor Air Quality (IAQ) touchscreen universal programmable thermostat provides electronic control of 24-volt (AC) heating and cooling systems in addition to humidification, dehumidification and ventilation with just three wires to thermostat. Automatic or manual changeover, 4 heat/2 cool stages. Advanced dual-fuel control. Three wires to 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 single point. Automatically raises humidity levels throughout home, preventing dryness and protecting hardwood flooring and woodwork. Removes air pollutants by exchanging stale air with fresh, filtered air.


NameHoneywell YTH9421C1010 - VisionPRO® IAQ Touchscreen Universal Programmable Thermostat 4H/2C with Auto or Manual Changeover
Gemaire Item NumberYTH9421C1010
Manufacturer Product NumberYTH9421C1010/U
SKU - PIM Number1371469486712
ERP Number227724
Unit of MeasureEACH
Weight2.0 Pound (lb.)
Length8.8 Inches (in)
Width5.5 Inches (in)
Height4.2 Inches (in)
Hazardous MaterialNo
EPA Cert RequiredNo
Country of OriginMEX
Voltage20-30 VAC
Electrical RatingTHM5421 is rated 20 to 30 VAC
Power MethodCommunicating
Batteries IncludedNo
Stages Cool2
Stages Heat3
IncludesTH9421C1004 Thermostat, THM5421C1008 Equipment Interface Module and C7089U1006 Outdoor Temperature Sensor
Sensing ElementYes
ApplicationHeat/Cool or Heat Pump with Auxiliary Heat
Comments/NotesIncludes 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.
Differential Temperature± 1°F; ±0.5°C
Dual Transformer CompatibleYes
Fan SwitchingYes
Operating Humidity5 to 90% RH, non-condensing
System SwitchingYes
Temperature RangeHeat: 40°F to 90°F (4.5°C to 32°C); Cool: 60°F to 99°F (15°C to 37°C)
Terminal Designations1, 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
Warranty Offered5 Year
GEM - Case Quantity