White Rodgers 1F78-151 Installation and Operation Instructions

Installation Instructions for

2

HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED

FLAT BLADE SCREWDRIVER

WIRE CUTTER/STRIPPER

1

CAUTION

!

3

Figure 1. Thermostat base

Mounting

hole

W903 Clip to
Disable EMR

Feature

W904 Clip for

Celsius Display

Mounting

hole

Electric/Gas

Switch

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

W905 Clip for

Hydronic System

W

RH

BRC

G

O

Y

+

-

+

-

GAS

ELEC

W904

W905

W903

Heating & Air Conditioning

1F78

5/2 Day Programmable Thermostat

CONTENTS

Preparations .................................................. 1

Thermostat Details ........................................ 1

Removing Old Thermostat ............................. 1

Mounting and Wiring ...................................... 2

Check Thermostat Operation ......................... 3

Programming your Thermostat ...................... 4

Specifications ................................................ 6

Troubleshooting ............................................. 6

YOUR THERMOSTAT REPLACES

Typical System Compatibility Chart 1E78

Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) Yes
Electronic Ignition Heat Only Two Wire Systems (24 volt) Yes
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) Yes
Standard Heat/Cool Systems (24 volt) Yes
Heat/Cool Systems Electric Heat (24 volt) Yes
Heat Only Electric Heat Systems (24 volt) Yes
Cool Only Systems (24 volt) Yes
Heat Pump Systems (No Aux. or Emergency Heat) Yes
Hot Water Zone Heat Only (Two Wire) Systems Yes
Hot Water Zone Heat Only (Three Wire) Systems No
Line Voltage Heating or Baseboard 110/240 Volt Systems No
Millivolt Systems Floor or Wall Furnaces Yes
12 VDC Mobile Home Application Yes
Multistage Systems No
Systems Exceeding 30VAC, 1.5 Amp No

THERMOSTAT DETAILS

PREPARATIONS

Assemble tools required below.

Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage

REMOVING OLD THERMOSTAT

To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main fuse
or circuit breaker until installation is complete.

Before removing wires from old thermostat’s switching subbase,
label each wire with the terminal designation it was removed
from.

1. Remove Old Thermostat: A standard heat/cool thermostat

consists of three basic parts:
a. The cover, which may be either a snap-on or hinge type.
b. The base, which is removed by loosening all captive screws.
c. The switching subbase, which is removed by unscrewing

the mounting screws that hold it on the wall or adaptor plate.

2. Shut off electricity at the main fuse box until installation is

complete. Ensure that electrical power is disconnected.

3. Remove the front cover of the old thermostat. With wires still
attached, remove wall plate from the wall. If the old thermostat
has a wall mounting plate, remove the thermostat and the wall
mounting plate as an assembly.

4. Identify each wire attached to the old thermostat.

5. Disconnect the wires from the old thermostat one at a time. DO

NOT LET WIRES FALL BACK INTO THE WALL.

6. Install new thermostat using the following procedures.

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PART NO. 37-6614C

Replaces 37-6614B

1027

3

REMOVING OLD THERMOSTAT

4

CAUTION

!

TERMINAL CROSS REFERENCE CHART

New Thermostat

Terminal Designation

Other Manufacturers’
Terminal Designation

RH

RC

G

W

Y

4

R

G

W

Y

RH

R

G

W

Y

M

V

F

H

C

R5

-

G

4

Y6

R

-

G

W

Y

**

* These are four-wire, single-transformer systems.
Factory installed jumper wire between the RH
and RC terminals must remain in place.

WARNING

!

CONTINUED FROM FIRST PAGE

ATTENTION! This product does not contain mercury. However, this
product may replace a unit which contains mercury.

Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing non-absorbent gloves, take up
the spilled mercury and place into a container which can be sealed.
If a cell becomes damaged, the unit should be discarded.

Mercury must not be discarded in household trash. When the unit
this product is replacing is to be discarded, place in a suitable con­tainer. Refer to www.white-rodgers.com for locations to send prod­uct containing mercury.

MOUNTING AND WIRING

Do not use on circuits exceeding specified voltage. Higher
voltage will damage control and could cause shock or fire
hazard.

Do not short out terminals on gas valve or primary control
to test. Short or incorrect wiring will damage thermostat
and could cause personal injury and/or property damage.

Thermostat installation and all components of the system
shall conform to Class II circuits per the NEC code.

Take care when securing and routing wires so they do not
short to adjacent terminals or rear of thermostat. Personal
injury and/or property damage may occur.

Energy Management Recovery (EMR)

This thermostat is set to operate with EMR. This causes the
thermostat to start the heating or cooling system early to have
the room temperature reach the program setpoint at the time
the period is to start.

To disable EMR, clip jumper W903 (see Fig. 1).

Electric Heat or Single-Stage

Heat Pump Systems

This thermostat is configured from the factory to operate a heat/
cool, fossil fuel (gas, oil, etc.), forced air system. It is configured
correctly for any system that DOES NOT require the thermostat
to energize the fan on a call for heat. If your system is an electric
or heat-pump system that REQUIRES the thermostat to turn on
the fan on a call for heat, locate the GAS/ELECTRIC switch (see
fig. 1) and switch it to the ELECTRIC position. This will allow the
thermostat to energize the fan immediately on a call for heat. If you
are unsure if the heating/cooling system requires the thermostat
to control the fan, contact a qualified heating and air conditioning
service person.

Hydronic (Hot Water or Steam)

Heating Systems

This thermostat is set to operate properly with a forced-air heating
system. If you have a hydronic heating system (a system that heats
with hot water or steam), you must set the thermostat to operate
properly with your system.

The factory default setting is forced air heat. Clipping jumper W905
on the circuit board will produce a longer heating cycle which is
normally for hot water or steam (hydronic) systems. Both settings
produce a very accurate temperature control and can be set to your
personal preference. As received, the thermostat cycles the system
just under 1°F. With W905 clipped, the system cycles at approxi­mately 1.5°F.

Attach Thermostat Base to Wall

1. Remove the packing material from the thermostat. Gently pull
the cover straight off the base. Forcing or prying on the ther­mostat will cause damage to the unit. If necessary, move the
electric heat switch (see ELECTRIC HEAT SYSTEMS, above).

2. Connect wires beneath terminal screws on base using appro­priate wiring schematic (see figs. 2 through 7).

3. Place base over hole in wall and mark mounting hole locations
on wall using base as a template.

4. Move base out of the way. Drill mounting holes.

5. Fasten base loosely to wall, as shown in fig. 1, using two mount­ing screws. Adjust until level, and then tighten screws. (Leveling
is for appearance only and will not affect thermostat operation.)
If you are using existing mounting holes, or if holes drilled are
too large and do not allow you to tighten base snugly, use plas­tic screw anchors to secure subbase.

6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.

Battery Location

This thermostat requires 2 “AAA” alkaline batteries to operate. If

is displayed, the batteries are low and should be re­placed. For best results, replace batteries once a year with new pre­mium brand alkaline batteries such as Duracell® or Energizer®. To
replace the batteries, install the batteries along the top of the base
(see fig. 1). The batteries must be installed with the positive (+)
ends to the right.

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4

MOUNTING AND WIRING

RH

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

Figure 2. Typical wiring diagram for

heat only, 3-wire, single transformer systems

TRANSFORMER

Heating
System

Fan

Relay

Y

RC

JUMPER

WIRE

OB

For 2-wire Heat only,
attach to RH and W

NOTE

RH

Y

24 VAC

120 VAC

Hot

Neutral

TRANSFORMER

THERMOSTAT

SYSTEM

G W

Figure 3. Typical wiring diagram for

cool only, 3-wire, single transformer systems

Cooling
System

Fan

Relay

RCOB

JUMPER

WIRE

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

Figure 4. Typical wiring diagram for

heat/cool, 4-wire, single transformer systems

TRANSFORMER

Heating

System

Fan

Relay

Cooling
System

RC

JUMPER

WIRE

OB

RED jumper wire (provided with thermostat) must be

connected between thermostat RH and RC terminals
for proper thermostat operation with this system.

NOTE

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

Figure 5. Typical wiring diagram for

heat/cool, 5-wire, two-transformer systems

HEATING

TRANSFORMER

Heating
System

Fan

Relay

Cooling
System

RC

24 VAC

120 VAC

Hot

Neutral

COOLING TRANSFORMER

OB

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

Figure 6. Typical wiring diagram for heat pump

with reversing valve energized in COOL

TRANSFORMER

Reversing

Valve*

RCOB

JUMPER

WIRE

Compressor

Contactor

JUMPER

WIRE

* Reversing valve is energized when the
system switch is in the COOL position

Fan

Relay

RH

Y

24 VAC

120 VAC

Hot

Neutral

THERMOSTAT

SYSTEM

G W

Figure 7. Typical wiring diagram for heat pump

with reversing valve energized in HEAT

TRANSFORMER

Reversing

Valve*

RCOB

JUMPER

WIRE

Compressor

Contactor

JUMPER

WIRE

* Reversing valve is energized when the
system switch is in the HEAT position

Fan

Relay

5

CAUTION

!

CONTINUED FROM SECOND PAGE

CHECK THERMOSTAT OPERATION

NOTE

To prevent static discharge problems, touch side of thermo­stat to release static build-up before touching any keys.

If at any time during testing your system does not operate properly,
contact a qualified service person.

Fan Operation

If your system does not have a G terminal connection, skip to
Heating System.

1. Turn on power to the system.

2. Move FAN switch to ON position. The blower should begin to

operate.

3. Move FAN switch to AUTO position. The blower should stop im-

mediately.

To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate the
cooling system.

Cooling System

This thermostat has a time delay between cooling cycles to allow
the head pressure in the compressor to stabilize. If the temperature
is adjusted to call for cool within 5 minutes of the last cycle the
snowflake icon will blink indicating the thermostat is locked out. Af­ter 3 to 5 minutes, the compressor will start and the snowflake icon
will stop flashing. This helps prevent the compressor from cycling
too quickly and is normal operation for the thermostat.

1. Move SYSTEM switch to COOL position.

2. Press
ture. The blower should come on immediately on high speed,
followed by cold air circulation

3. Press
ture. The cooling system should stop operating.

1. Move SYSTEM switch to HEAT position. If the heating system
has a standing pilot, be sure to light it.

2. Press
ture. The heating system should begin to operate.

3. Press
ture. The heating system should stop operating.

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to adjust thermostat setting below room tempera-

to adjust temperature setting above room tempera-

Heating System

to adjust thermostat setting above room tempera-

to adjust temperature setting below room tempera-

5

CHECK THERMOSTAT OPERATION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

FAN SYSTEM

OFFON AUTO COOL HEAT

Figure 8. Thermostat display, buttons, and switches

CONTINUED FROM THIRD PAGE

Before you begin using your thermostat, you should be familiar
with its features and with the display and the location and operation
of the thermostat buttons. Your thermostat consists of two parts:
the thermostat cover and the base. To remove the cover, gently
pull it straight out from the base. To replace the cover, line up the
cover with the base and press gently until the cover snaps onto the
base.

The Thermostat Buttons and Switches

(Up arrow) Raises temperature setting.

(Down arrow) Lowers temperature setting.

Time button.

PRGM (program) button.

RUN (program) button.

HOLD button.

FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

The Display

Indicates day of the week.

is displayed when the SYSTEM switch is in the HEAT

position.
switch is in the COOL position.
when the compressor is in 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 currently programmed set temperature (this is blank

when SYSTEM switch is in the OFF position).

“HOLD” is displayed when the thermostat is in the HOLD

mode.

is displayed (non-flashing) when the SYSTEM

is displayed (flashing)

Operating Features

Now that you are familiar with the thermostat buttons and display,
read the following information to learn about the many features of
the thermostat.

• SIMULTANEOUS HEATING/COOLING PROGRAM STOR­AGE — When programming, you can enter both your heating

and cooling programs at the same time. There is no need to
reprogram the thermostat at the beginning of each season.

• TEMPERATURE OVERRIDE— Press
display shows the temperature you want. The thermostat will
override current programming and keep the room temperature
at the selected temperature until the next program period be­gins. Then the thermostat will automatically revert to the pro­gram.

• HOLD TEMPERATURE — The thermostat can hold any tem-
perature within its range for an indefinite period, without re­verting to the programmed temperature. Press HOLD button.
“HOLD” will be displayed. Then choose the desired temper­ature by pressing
room temperature at the selected setting until you press the
RUN button to start program operation again.

or until the

or . The thermostat will hold the

• ENERGY MANAGEMENT RECOVERY — Energy Manage-

ment Recovery (EMR) causes the thermostat to start heating
or cooling early to make the building temperature reach the
program setpoint at the time you specify. Heating will start 5
minutes early for every 1° of temperature required to reach
setpoint. Cooling will start approximately 15 minutes early for
every 1° because it takes longer to reach temperature. Clip­ping W903 jumper will disable EMR.

Example: You select EMR and have your heating programmed
to 65° at night and 70° at 7 AM. If the building temperature is
65° the difference between 65° and 70° is 5°. Allowing 5 min­utes per degree the thermostat setpoint will change to 70° at
6:35 AM.

• °F/°C CONVERTIBILITY — The factory default setting is Fahr-

enheit. Clipping W904 jumper on the circuit board (see fig. 1)
will alter this feature to Celsius temperature setting.

• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline batter-

ies are low and should be replaced, the display will be blank
except for
ing any button will cause the display to operate for ten sec­onds. After ten seconds, the display will be blank except for

. After has been displayed for 4

weeks, the thermostat will raise the temperature 10° above
your setpoint in COOL mode and drop the temperature 10°
below your setpoint in HEAT mode. You cannot program with
low batteries, but you can override setpoint temperature.

• TEMPERATURE DISPLAY ADJUSTMENT — Your new ther-

mostat has been accurately set in our factory. However, if you
wish, you may adjust your new thermostat temperature dis-

. When the batteries are low, press-

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6

play to match your old thermostat. This can be accomplished

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

SAMPLE

Heating/Cooling Schedule Plan (Factory Program)

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

6:00 AM

8:00 AM

5:00 PM

10:00 PM

70 F

62 F

70 F

62 F

78 F

85 F

78 F

82 F

70 F

62 F

70 F

62 F

78 F

85 F

78 F

82 F

WEEKDAY (5 DAY)

WEEKEND (2 DAY)

Start
Time Temperature

Start

Time Temperature

Period

COOL HEAT

PM

AM

MO TU WE TH FR

WEEKDAY (5 DAY)

WEEKEND (2 DAY)

Start

Time Temperature

Start
Time Temperature

Heating/Cooling Schedule Plan

Period

COOL

1ST

2ND

3RD

4TH

1ST

2ND

3RD

4TH

COOL HEAT

(within a ±3° range) as follows:

1. Press PRGM and RUN buttons at the same time.

2. Press

or to adjust the displayed temperature to

your desired setting.

3. Press RUN to resume normal program operation.

• Display Backlight — (Not available on earlier models.) The

display backlight improves display contrast in low lighting
conditions. Selecting backlight ON will turn the light on for
a short period of time after any button is pressed. Selecting
backlight OFF (default) will keep the light off. Turn the dis­play backlight feature ON as follows:

1. Press TIME and RUN buttons at the same time. The display

will show “d-L” and “OFF” alternately.

2. Press

PROGRAMMING YOUR THERMOSTAT

or to change “OFF” to “ON”

This section will help you plan your thermostat’s program to meet
your needs. For maximum comfort and efficiency, keep the follow­ing guidelines in mind when planning your program.

• Whenheating (cooling) your building,program the tempera­tures to be cooler (warmer) when the building is vacant or dur­ing periods of low activity.

• During early morning hours, the need forcooling is usually

minimal.

Look at the factory preprogrammed times and temperatures shown
below. If this program will suit your needs, simply press the RUN
button to begin running the factory preset program.
If you want to change the preprogrammed times and temperatures,
follow these steps.

Determine the time periods and temperatures for your weekday
and weekend programs. You must program four periods for both the
weekday and weekend program. However, you may use the same
heating and cooling temperatures for consecutive time periods. You
can choose start times, heating temperatures, and cooling tem­peratures independently for both weekday and weekend programs
(for example, you may select 5:00 AM and 70° as the weekday 1st
period heating start time and temperature, and also choose 7:00
AM and 76° as the weekday 1st period cooling start time and
temperature). Use the table at the bottom of the page to plan your
program time periods and the temperatures you want during each
period. You may also want to look at the sample program table to
get an idea of how the thermostat can be programmed.

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. “A” (indicating weekday program) will appear
in the display. Also displayed are the currently programmed start
time for the 1st heating period and the currently programmed
temperature (flashing).

EXAMPLE:

This display window shows that 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
selected temperature for the 1st heating program period.

4. Press TIME once (the programmed time will flash). Press
or
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 currently programmed start time and
setpoint temperature for the 2nd heating program period will
appear.

or to change the displayed temperature to your

until your selected time appears. The time will change

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