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Features |
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• 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. |
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Product Specifications |
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Description |
VisionPRO® IAQ Total Home Comfort System with Temperature, Humidification, Dehumidification and Ventilation Control |
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Application |
Heat/Cool or Heat Pump with Auxiliary Heat |
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Programmability |
7 Day Multiple Day Programming or Non-Programmable |
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Changeover |
Auto/Manual Selectable |
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Switch Positions (System) |
HEAT-OFF-COOL-AUTO-EM.HEAT |
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Switch Positions (Fan) |
AUTO-ON-CIRC |
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Power Method |
Communicating |
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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 |
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Dimensions (in.) |
4 9/16 in. high x 6 in. wide x 1 1/4 in. deep |
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Dimensions (mm) |
116 mm high x 152 mm wide x 32 mm deep |
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Electrical Ratings |
THM5421 is rated 20 to 30 Vac |
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Setting Temperature Range (F) |
Heat: 40 F to 90 F; Cool: 60 F to 99 F |
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Setting Temperature Range (C) |
Heat: 4.5 C to 32 C; Cool: 15 C to 37 C |
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Differential Temperature (F) |
± 1 F |
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Differential Temperature (C) |
±0.5 C |
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Stages |
Up to 4 Heat/2 Cool Heat Pump |
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Stages |
Up to 3 Heat/2 Cool Conventional |
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Outdoor Sensor |
Yes, optional |
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Discharge Sensor |
Yes, optional |
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Remote Sensor |
Yes, optional |
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Sensor Element |
Thermistor |
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Heat Current |
1.0 A running |
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Cool Current |
1.0 A running |
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Operating Humidity Range (% RH) |
5 to 90% RH, non-condensing |
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Includes |
TH9421C1004 Thermostat and THM5421C1008 Equipment Interface Module |
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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. |
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Humidification Setting Range |
10 to 60% RH. |
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Dehumidification Setting Range |
40 to 80% RH. |
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Literature and other Resources Download
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Product Data - (TH9421 VisionPRO IAQ Total Home Comfort System)
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Product Data - (TH9421 Systeme de regulation d'ambiance pour toute la maison - French)
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Installation Guide - (TH9421 VisionPRO IAQ Touch-screen Programmable Thermostat, English, French, Spanish)
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Product Data - (TH9421C de confort total del hogar, para una mejor calidad del aire interior - Spanish)
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Installation Guide - (TH9421 VisionPRO IAQ Equipment Interface Module - English, French, Spanish)
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Operating Manual - (TH9421 Total Home Comfort System - English, French, Spanish)
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Error Codes - (TH9421C EnviraCOM Error Codes - English, French, Spanish)
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Installation Instructions - (TH9421 Range Stop Instructions - English, Spanish)
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VisionPRO 9000 - 3 inch Main(Photo_BW - Web Quality Image)
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VisionPRO 9000 - 3 inch Main(Photo_BW - Print Quality Image)
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VisionPRO 9000 - 6 inch Main(Photo_BW - Web Quality Image)
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VisionPRO 9000 - 6 inch Main(Photo_BW - Print Quality Image)
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VisionPRO 9000 - 3 inch Main(Photo_Color - Web Quality Image)
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VisionPRO 9000 - 3 inch Main(Photo_Color - Print Quality Image)
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VisionPRO 9000 - 6 inch Main(Photo_Color - Web Quality Image)
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VisionPRO 9000 - 6 inch Main(Photo_Color - Print Quality Image)
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