Nhanganyaya
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Emerson 1E78-140 Non-Programmable Heat Only Thermostat. Please read this manual thoroughly before installation and use to ensure proper function and safety.
The Emerson 1E78-140 is designed for use with most single-stage heat-only systems, including 24-volt and millivolt systems. It is not compatible with electric baseboard heat or certain other systems.
Setup uye Installation
Zvishandiso Zvinodiwa
- Screwdriver
- Drill (kana maburi matsva ekukwira achidikanwa)
- Wire strippers (kana zvichidikanwa)
Kubvisa Yako Yekare Thermostat
- Turn off power to your heating system at the main fuse or circuit breaker panel.
- Bvisa chivharo chekare chethermostat.
- Tora mufananidzo wezvinobatanidza waya zviripo kuti uzvitarise.
- Disconnect the wires from the old thermostat terminals, noting which wire was connected to each terminal.
- Remove the old thermostat base from the wall.
Kuisa iyo New Thermostat
- Bvisa chifukidziro chepamberi kubva pachigadziko chethermostat.
- Position the new thermostat base on the wall. Use the provided screws and anchors to secure it.
Wiring
Zvakakosha: Ensure power is off before wiring. This thermostat is for 2-wire heat-only systems. Connect wires only to R and W terminals.
Refer to the wiring diagram below. Identify each wire attached to the old thermostat by taking a photo of old wiring.

Image: Wiring diagram for the Emerson 1E78-140 thermostat. It illustrates connections for 2-wire heat-only systems to R and W terminals. The image also shows two AAA Energizer batteries and various mounting screws and anchors included with the thermostat. A caution notice regarding battery life and freeze hazard is visible.
- Connect the wire from your heating system's R terminal to the R terminal on the thermostat.
- Connect the wire from your heating system's W terminal to the W terminal on the thermostat.
Kuiswa kweBattery
The thermostat requires two AAA batteries for operation. Install the batteries into the compartment located on the back of the thermostat, observing the correct polarity (+/-).

Mufananidzo: Mberi view of the Emerson 1E78-140 thermostat. The digital display shows "70" as the current temperature. To the right of the display are two gray buttons for adjusting the temperature up and down. Below the Emerson logo, a system switch is visible, set to "OFF HEAT".
After wiring and battery installation, attach the thermostat front cover to the base.
Turn on power to your heating system at the main fuse or circuit breaker panel.
Operating Instruction
Shanduko Shanduko
The system switch is located on the front of the thermostat. It has two positions:
- DZIMA: Turns the heating system off.
- KUSVIRA: Inomisa iyo yekudziya system kuchengetedza tembiricha yakatarwa.
Kuisa Tembiricha
Use the Up (▲) and Down (▼) buttons located next to the digital display to adjust your desired temperature setting. The thermostat will maintain this temperature with a precision of plus/minus 1 degree Fahrenheit.
Backlight
The digital display features a backlight for improved visibility, especially in low-light conditions. The backlight activates when buttons are pressed.
Maintenance
Kutsiviwa kwebhatiri
When the "Change Battery" indicator (a battery icon) is displayed on the screen, the batteries have limited remaining life and should be replaced soon. The system will not operate with dead batteries.
- Bvisa chivharo che thermostat.
- Bvisa mabhatiri ekare AAA.
- Isa maviri matsva eAAA alkaline mabhatiri, kuve nechokwadi chechokwadi polarity.
- Tsiva iyo thermostat butiro.
Kuchenesa
Chenesa thermostat nekanyoro, damp jira. Usashandise abrasive cleaners kana solvents.
Kugadzirisa matambudziko
| Dambudziko | Zvinogona Kukonzera | Solution |
|---|---|---|
| Kuratidza hakuna chinhu kana kudzima. | Mabhatiri akafa kana mashoma. | Tsiva mabhatiri maviri eAAA. |
| Heating system haina kutendeuka. |
|
|
| "Change Battery" icon displayed. | Simba rebhatiri rakaderera. | Replace the two AAA batteries promptly. |
Zvinotsanangurwa
| Feature | Detail |
|---|---|
| Brand | Emerson |
| Model Number | 1E78-140 |
| Controller Type | Push Bhatani |
| Special Feature | Kuratidza Tembiricha |
| Temperature Control Type | Manual |
| Inosanganisirwa Zvikamu | Thermostat, Temperature Sensor |
| Simba Source | Electric (2 AAA batteries for display/control) |
| Voltage | 24 Volts (for system operation) |
| Display Type | LED |
| Kudzora Nzira | Bata (mabhatani) |
| Mounting Type | Gomo reMasvingo |
| Style | Digital |
| Backlight | Ehe |
| Kugarisana | Vazhinji vasina-ma-stage heat-only systems (24V and millivolt). Not compatible with electric baseboard heat. |
| Precision | +/- 1 degree F |

Mufananidzo: A divi view of the Emerson 1E78-140 thermostat, held in a hand for scale. The image indicates the thermostat's height is 5.5 inches (14 cm).
Warranty Information
Specific warranty details for the Emerson 1E78-140 thermostat are typically provided with the product packaging or can be obtained directly from the manufacturer, Emerson. Please refer to the documentation included in your product box or visit the official Emerson websaiti kuti uwane mitemo nemamiriro ewarandi aripo parizvino.
Mutengi Support
For technical assistance, troubleshooting beyond this manual, or inquiries regarding your Emerson 1E78-140 thermostat, please contact Emerson customer support. Contact information can usually be found on the product packaging or on the official Emerson website.





