Your browser is not supported. For the best experience, you should upgrade to a modern browser with improved speed and security.

Honeywell YTHX9421R5085SG - Prestige® 2-Wire IAQ Kit, HD Color Touchscreen Thermostat, RedLINK™ Technology

Item: YTHX9421R5085SG
MFR: YTHX9421R5085SG/U
Checking price...
Decrease quantity
Increase quantity

Your Order Templates
Save products for later, or create lists to quickly re-buy items for routine jobs.

Add to Order Template

Inventory At Nearby Branches



The Prestige® IAQ thermostat is a 2 wire high definition color touch screen thermostat, 7 day programmable and selectable for residential or light commercial use. 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. Three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation. Four sensor inputs for wired sensors or dry contact devices. Works with the Equipment Interface Module and RedLINK® accessories including the RedLINK® Internet Gateway, Portable Comfort Control, Wireless Outdoor Sensor and Wireless Indoor Sensor.


NameHoneywell YTHX9421R5085SG - Prestige® 2-Wire IAQ Kit, HD Color Touchscreen Thermostat, RedLINK™ Technology
Gemaire Item NumberYTHX9421R5085SG
Manufacturer Product NumberYTHX9421R5085SG/U
SKU - PIM Number1403693699599
ERP Number346032
Unit of MeasureEACH
Weight2.0 Pound (lb.)
Length10.0 Inches (in)
Width5.8 Inches (in)
Height5.2 Inches (in)
Hazardous MaterialNo
EPA Cert RequiredNo
Country of OriginMEX
Voltage18-30 VAC
Electrical ConnectionScrew terminals
Electrical Rating18 to 30 VAC
Power MethodHardwired
Stages Cool2
Stages Heat3
IncludesTHX9421R5021SG Prestige 2-Wire IAQ Thermostat, THM5421R1021 Equipment Interface Module and 2 Duct Sensors
ApplicationUp to 4 Heat/2 Cool Heat Pumps; Up to 3 Heat/2 Cool Conventional Systems
Comments/NotesTri-Lingual Display (selectable for English, French or Spanish)
Fan SwitchingYes
Operating Humidity5 to 90% RH, non-condensing
Operating Temperature Range32°F to 120°F (0°C to 48.8°C)
System SwitchingYes
Temperature RangeHeat: 40°F to 90°F (4.5°C to 32°C); Cool: 50°F to 99°F (10°C to 37°C)
Terminal DesignationsR, RC, RH, C, W-O/B, W2-AUX1, W3-AUX2, Y, Y2, G, A-L/A, U1, U1, U2, U2, U3, U3, S1, S1, S2, S2, S3, S3, S4, S4, A, B, C, D
Used WithRedLINK™ accessories
Warranty Offered5 Year
GEM - Case Quantity