White Rodgers 1E78-151 Basic Installation

Brand: White Rodgers

Model: 1E78-151

Category: Thermostats

Type: Basic Installation

White Rodgers 1E78-151 is a programmable thermostat that offers customizable temperature settings for both heating and cooling modes, allowing for energy efficiency and personalized comfort. Its user-friendly interface features a large display that alternates between the current time and temperature, making it easy to monitor your home's climate. With its simple programming options, you can set up to four different temperature periods per day, ensuring a comfortable environment throughout the day and night.

( ) Raises temperature setting.

( ) Lowers temperature setting.

*Time button.

*PRGM (program) button.

*RUN (program) button. Press RUN to resume program.

*HOLD button. Press HOLD to bypass the program. Press

RUN to resume program.

FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

* Programmable models only

THERMOSTAT

FURNACE/AIR HANDLER

TYPICAL TERMINAL DESIGNATIONS

R-RH

4-M-R5

R-RC-V

W-H-4

G-F

Y-Y6

REMOVE JUMPER

FOR 2 TRANSFORMER

RC/RH SYSTEMS

ADD JUMPER

FOR HEAT PUMP

APPLICATIONS

NOTE: FOR 2 WIRE HEAT ONLY SYSTEMS CONNECT TO RH AND W

24V POWER (HEATING)

24V POWER (COOLING)

HEATING RELAY

FAN RELAY

REVERSING VALVE

COOLING RELAY

ONLY REQUIRED FOR HEAT PUMP APPLICAITON

REVERSING VALVE ENERGIZED IN COOL MODE

ONLY REQUIRED FOR HEAT PUMP APPLICAITON

REVERSING VALVE ENERGIZED IN HEAT MODE

Basic Installation

Single Stage Thermostats

1E78-144 Non-Programmable

1E78-151 Programmable

For additional information visit: www.white-rodgers.com

For technical support: 1-888-725-9797

Home Owner Support Hotline: 1-877-978-7828

7am–1am CST Mon–Fri • 7am–4pm CST Sat–Sun

Feed wires through the back of the thermostat base and securely

mount to the wall with supplied screws and anchors.

- Switch Electric/Gas Switch to ELEC for Heat Pump or electric

heat application, leave in Gas for gas and oil applications.

- Clip jumper W903 (programmable models only) to disable

Energy Management Recovery feature that starts heat or cool

earlier than the program time.

- Clip jumper W904 for Celsius Display.

- Clip jumper W905 to produce a longer heating cycle which is

normally for hot water or steam (Hydronic Systems).

Mounting and Jumper Options:

Wiring:

Note: For 2 wire heat only systems connect to RH and W.

Identify each wire attached to the old thermostat using the labels

enclosed with the new thermostat.

• Replacebatterieswhen“Change ” is displayed.

• “Change ”indicatesbatterieshavelimited

remaining life.

• Systemwillnotoperatewithdeadbatteries.

CAUTION

NOTICE! FREEZE HAZARD

• Thermostat installation and all components of the

system shall conform to NEC code for class II circuits.

• Donotexceedspeciedvoltage.

• Donotshortterminalsongasvalveorprimarycontrol.

•Routeandsecurewirestopreventshortingtoadjacent

terminals

WARNING

www.white-rodgers.com

www.emersonclimate.com

PART NO. 37-7532A

1424

Base

Back of

Thermostat Body

ELEC GAS

GRH

YO B

W903

W904

W905

Elec/Gas

Switch

Mounting

Hole

Mounting

Hole

Figure 1. Thermostat

NOTE: Earlier models refer to 37-7006 for jumper locations.

Figure 8. Thermostat display,buttons and switches

Figure 1. Thermostat

Figure2.Thethermostatbuttonsandswitches

Indicates day of the week.

is displayed when the SYSTEM switch is in the HEAT

position. is displayed (non-ﬂashing) when the SYSTEM

switch is in the COOL position. is displayed (ﬂashing) when

the compressor is in 5-minute lockout mode.

Alternately displays current time and temperature.

is displayed when the 2 “AAA” batteries are low

and should be replaced. Nothing else will be displayed. Earlier

models display “LOBATTERY”. Refer to 37-7006.

Displays current setpoint temperature (this is blank when

SYSTEM switch is in the OFF position).

“HOLD” is displayed when HOLD is pressed to bypass the

program.

Programming:

EnteringYourProgram

Follow these steps to enter the heating and cooling programs you

have selected.

Set Current Time and Day

1. Press TIME button once. The display will show the hour only.

EXAMPLE:

2. Press and hold either or until you reach the correct hour

and AM/PM designation (AM begins at midnight; PM begins at

noon).

3. Press TIME once. The display window will show the minutes only.

EXAMPLE:

4. Press and hold either or until you reach the correct

minutes.

5. Press TIME once. The display will show the day of the week.

6. Press or until you reach the current day of the week.

7. Press RUN once. The display will show the correct time and

room temperature alternately.

Enter Heating Program

1. Move the SYSTEM switch to HEAT.

2. Press PRGM once. “MO TU WE TH FR” (indicating weekday

program) will appear in the display. Also displayed are the

currently programmed start time and the temperature (ﬂashing)

for the 1st heating period.

EXAMPLE:

MO TU WE TH FR

This display window shows for the 1st weekday period, the start

time is 6:00 AM, and 70° is the programmed temperature (this

example reﬂects factory preprogramming).

3. Press or to change the displayed temperature to your

selected temperature for the 1st heating program period.

4. Press TIME once (the programmed time will ﬂash). Press or

until your selected time appears. The time will change in 15

minute increments. When your selected time is displayed, press

TIME again to return to the change temperature mode.

5. Press PRGM once. The programmed start time and setpoint

temperature for the 2nd heating program period will appear.

6. Repeat steps 3 through 5 to select the start time and setpoint

temperature for the 2nd heating program period.

7. Repeat steps 3 through 6 for the 3rd and 4th heating program

periods. Weekday heating programs are now complete.

8. Press PRGM once. “SA SU” (indicating weekend program) will

appear in the display, along with the start time for the 1st heating

period and the programmed temperature (ﬂashing).

9. Repeat steps 3 through 7 to complete weekend heating

programming.

10. When you have completed entering your heating program,

press RUN.

Enter Cooling Program

If the outside temperature is below 50°F, disconnect power

to the cooling system before programming. Energizing the

air conditioner compressor during cold weather may cause

personalinjuryorpropertydamage.

1. Move SYSTEM switch to COOL position.

2. Follow the procedure for entering your heating program, using

your selected cooling times and temperatures.

DisplayLight

Programmable – Press TIME and RUN buttons at the same time.

Display will alternately show “d-L” and “OFF”. Press or to

change “OFF” to “ON”.

Non-programmable – With SYSTEM switch in HEAT, press and

at same time for two seconds. Display will alternately show “-L”

and “FF” (off). Press or to change “FF” to “ON”.

CheckYourProgramming

Follow these steps to check your thermostat programming one ﬁnal

time before beginning thermostat operation.

1. Move SYSTEM switch to HEAT position.

2. Press PRGM to view the 1st weekday heating period time and

temperature. Each time you press PRGM, the next heating

period time and temperature will be displayed in sequence for

weekday, then weekend program periods (you may change any

time or temperature during this procedure).

3. Press RUN.

4. Move SYSTEM switch to COOL position.

5. Repeat step 2 to check cooling temperatures.

6. Press RUN to begin program operation.

YOURTHERMOSTAT IS NOW COMPLETELY PROGRAMMED

AND READY TO AUTOMATICALLY PROVIDE MAXIMUM

COMFORTANDEFFICIENCY!

White-Rodgers is a business

of Emerson Electric Co.

The Emerson logo is a

trademark and service mark

of Emerson Electric Co.

www.white-rodgers.com

www.emersonclimate.com

Scan the QR code for

complete Installation and

Operation Instructions.

Figure 8. Thermostat display,buttons and switches

Figure3.Thermostatdisplay,buttonsandswitches

White Rodgers 1E78-151 Basic Installation

Brand: White Rodgers

Model: 1E78-151

Category: Thermostats

Type: Basic Installation

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White Rodgers 1E78-151 Basic Installation

White Rodgers 1E78-151 Basic Installation

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