Emerson 1F78-151 Digital Thermostat
Programming
- Choice of 5/2 day programming (weekday/weekend), 7 day or non-programmable
- 4 time and 4 temperature settings per program for heating and cooling (1F78-151) Energy savings up to 33%
Display
- Large, easy-to-read thermostat display
- New — Lighted display for easier low-light viewing
Comfort & Convenience
- Electronic temperature accuracy
- Adjustable room temperature calibration
Performance
- B & O terminals
- Meets California Building Code, Title 24 (1F78-151)
- Millivolt compatible
- Battery-powered thermostat for maximum compatibility (2 “AAA” Energizer® batteries included)
- Maintains room temperature differential within +/- 1 degree
Mechanical Footprint Comparison Legend
| White-Rodgers 1F78 Series Digital Thermostat | Height
3 3/4″ | Width
5 1/8″ | Depth
1 1/8″ | |
| Robertshaw 400 Series | 3 5/8″ | 3 1/4″ | 1 1/4″ | |
| Honeywell T87F w/subbase | 3 3/4″ | 3 3/4″ | 1 3/4″ | |
| White-Rodgers 1F56 | 3 1/4″ | 4 1/2″ | 1 5/8″ | |
| Honeywell T8034 | 2 7/8″ | 4 3/4″ | 1 5/16″ |
Economy Digital Thermostat Feature Comparison
| Feature | White-Rodgers 1F78-151 | Model Robertshaw 9600 | Lux PSP511 | CTC 43103 |
| Large, Easy-to-Read LCD | X | X | ||
| Lighted Display | X | |||
| Easy to Program | X | |||
| Best in Class Accuracy | X | |||
| Millivolt Compatible | X | X | X | X |
| Single Stage Heat Pump (B&O Terminals) | X | X | X | |
| True 5/2 Day Programming | X | X | X | |
| Soft-Touch Buttons | X | X |
Terminal Designations
- Dimensions
- 1″W x 3.75″H x 1.1″D
- Electrical Specifications
- Rating
- 0 to 30 VAC, 50/60 Hz or DC 0.05 to 1.0 Amp (load per terminal)
- 5 Amps maximum load (all terminals combined)
- Standard Systems
- Single-stage gas, oil, electric
- Single-stage heat pump
- Millivolt compatible
For Additional Information
- Visit www.white-rodgers.com
Smart Design Covers the Wall Marks of Others
- No spackling or painting is necessary because its smart design hides wall marks left by the most popular mechanical thermostats. Plus it has a lower profile
Application Guide
| Series | System | Programs | Power Source |
| 90 – Premium 80 – Standard | Single Stage | 7 day | Power stealing w/battery back-up Hardwired/battery |
| Multi-Stage Heat Pump | 5/1/1 day | ||
| 5/2 day Non-programmable | Battery | ||
| 70 – Economy | Hardwired |
Thermal Specifications
- Setpoint Temperature Range: 45° to 90°F (7° to 32°C)
- Rated Differential: 0.6° to 1.9°F with adjustable anticipation
- Operating Ambient Temperature: 32° to 105°F (0° to 40°C)
- Operating Humidity Range: 90% non-condensing maximum
- Shipping Temperature Range: -4° to 150°F (-20° to 65°C)
Accessories
- Wall Plate F61-2510 with 2″ x 4″ junction box adaptor (6.5″W x 4.5″H)
- Wall Plate F61-2550 (6.5″W x 4.5″H)
- Thermostat Guard F29-0231
- (For additional guard options refer to White-Rodgers catalog.)
For more manuals by Emerson, visit ManualsLibraryy
Emerson 1F78-151 Digital Thermostat-FAQs
What does “Mode” mean on a thermostat?
Thermostat modes configure how your AC operates to provide the desired comfort in your home.
How does a thermostat work step by step?
A thermostat uses a bi-metal coil or strip that moves with temperature changes, triggering mercury or electronic components to signal the system to heat or cool.
How does thermostat “AUTO” mode work?
In “AUTO” mode, the fan runs only when the system is actively heating or cooling. It shuts off when the desired temperature is reached, saving energy.
What are thermostat settings?
Thermostats have two primary settings:
1. Cool: Activates air conditioning to cool your home.
2. Heat: Activates heating to warm your home.
Should the Emerson thermostat be on “AUTO” or “ON”?
“AUTO” is more energy-efficient, as the fan only runs when the system is heating or cooling.
What does “SA” mean on a thermostat?
“SA” stands for “Supply Air,” referring to the air delivered from the HVAC system to your home.
How do I turn off the program on my thermostat?
Press the up or down buttons to set the desired temperature and then press the “Hold” button to maintain it indefinitely.
How do I program my thermostat?
Follow these steps:
1. Refer to the user manual.
2. Set the date and time.
3. Press “Set” or “Program” to adjust temperature and time preferences.
4. Save settings for leave, return, and sleep times.
How do I verify a thermostat is working?
Test your thermostat by gradually increasing or decreasing the temperature and listening for the system to respond.
Which mode is best for AC?
“Eco” or “Energy-Saving” mode balances comfort and energy efficiency by adjusting fan speed and temperature.
What is “Fan” mode on a thermostat?
In “Fan” mode, the fan runs continuously to circulate air, even when the system isn’t heating or cooling.