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VisionPRO IAQ Total Home Comfort System with Temperature, Humidification, Dehumidification and Ventilation Control.
Includes Outdoor Temperature Sensor

| Description | VisionPRO IAQ Total Home Comfort System with Temperature, Humidification, Dehumidification and Ventilation Control |
| 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 (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 99 F |
| Setting Temperature Range (C) | Heat: 4.5 C to 32 C; Cool: 15 C to 37 C |
| 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 | Outdoor Sensor Included |
| 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 |
| Includes | TH9421C1004 Thermostat, THM5421C1008 Equipment Interface Module |
| 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 |