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Emerson 1F85U-42PR Programmable HVAC Control
Programmable HVAC thermostat with 7-day or 5-1-1 scheduling, backlit display and dual-fuel control for 240 V systems
- TypeProgrammable, Hand Control
- Size/Dimensions6 in x 1.13 in x 3.75 in
- ColorWhite
- Voltage240V
- Mount TypeWall Mount
- Relay Contact1F85U-42PR (new model), 100240 volts
- Easy reading in low light with large backlit display
- Flexible scheduling via 7-day or 5-1-1 day options
- Quick DIY setup using built-in level and pluggable terminals
- Secure control through keypad lockout and temperature limits
- Dual fuel operation without outdoor sensor required
Programmable HVAC thermostat for residential
The Emerson 1F85U-42PR is a wall-mounted programmable thermostat designed for 240 V residential heating and cooling systems. It supports selectable 7-day, 5-1-1-day or non-programmable operation with four daily periods. The unit is sold individually from a 12-pack carton and includes a built-in level indicator and pluggable terminals to simplify first-time installation.
Sustained scheduling and dual-fuel operation
The thermostat maintains programmed set-points continuously across extended heating or cooling seasons without drift. Its dual-fuel logic manages heat-pump and fossil-fuel stages automatically without requiring an outdoor temperature sensor. A filter-change reminder tracks runtime over months of operation, and keypad lockout prevents unauthorised adjustments during prolonged use.
White housing with backlit display and universal
The white plastic housing measures 6 in x 1.13 in x 3.75 in and features a large backlit display readable in low light. A universal back-plate accommodates existing wiring holes, while pluggable terminal blocks allow wires to be connected before the thermostat body is snapped into place. The device does not support line-voltage baseboard systems rated at 110 V or 220 V, nor proprietary communicating equipment.
Highlights
- Easy reading in low light with large backlit display
- Flexible scheduling via 7-day or 5-1-1 day options
- Quick DIY setup using built-in level and pluggable terminals
- Secure control through keypad lockout and temperature limits
- Dual fuel operation without outdoor sensor required
Specifications
| Type | Programmable, Hand Control |
|---|---|
| Brand | White-Rodgers, Copeland |
| Model | 1F85U-42PR |
| Size/Dimensions | 6 in x 1.13 in x 3.75 in |
| Color | White |
| Voltage | 240V |
| Mount Type | Wall Mount |
| Relay Contact | 1F85U-42PR (new model), 100240 volts |
| Standards/Certifications | not_capable_emitting_rf_energy |
| Item Count | 12 pack |
| Selling Unit | 1 |
| Features | White-Rodgers |
| Part Number | 1F85U-42PR |
Questions about this item
Does the 240 V programmable thermostat draw noticeable power or generate heat when running continuously?
It operates on standard 24 V control voltage and uses a 100240 V relay contact, so its own power draw and heat output are negligible during all-day operation.
What existing wiring and system components are required for the 1F85U-42PR to function?
You need a conventional 24 V HVAC system with C, R, W, Y, G terminals; it will not work with 110 V or 220 V line-voltage baseboard heat or proprietary communicating equipment.
Will the 1F85U-42PR control an older dual-fuel furnace and heat-pump combination without extra sensors?
Yes, dual-fuel control is built in and eliminates the need for an outdoor sensor, so it manages the changeover between the existing furnace and heat pump automatically.
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