CONTENTS
Installation Instructions for
Preparations.................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat ............................ 1
Mounting and Wiring ..................................... 2
Check Thermostat Operation ........................ 3
Configuration Menu ....................................... 4
Programming your Thermostat ..................... 5
Specifications ................................................ 7
Troubleshooting ............................................ 8
Heating & Air Conditioning
1F78H
5/2 Day Programmable Thermostat
YOUR THERMOSTAT REPLACES
PREPARATIONS
1
Typical System Compatibility Chart
1F78H
Standard Heat Only Gas or Oil Fired Systems (24 volt)*
Electronic Ignition Heat Only Two Wire Systems (24 volt)*
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)*
Standard Heat/Cool Systems (24 volt)*
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Assemble tools required as shown below.
Heat/Cool Systems Electric Heat (24 volt)*
Heat Only Electric Heat Systems (24 volt)*
Cool Only Systems (24 volt)*
FLAT BLADE SCREWDRIVER
WIRE CUTTER/STRIPPER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
Heat Pump Systems (No Aux or Emergency Heat)*
Hot Water Zone Heat Only Systems
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—
THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY
Hot Water Zone Heat Only (Three Wire) Systems
Line Voltage Heating or Baseboard 110/240 Volt Systems
Millivolt Systems Floor or Wall Furnaces
12 VDC Mobile Home Application
No
No
No
No
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage
Multistage Systems
No
Systems Exceeding 30VAC, 1.5 Amp
No
* Requires common wire for 24VAC at the thermostat
THERMOSTAT DETAILS
3
REMOVING OLD THERMOSTAT
2
Mounting
hole
CAUTION
!
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 wirewith the terminal designation it was removed from.
W
C
RH
B
RC
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.
G
O
Y
Mounting
hole
W904
W905
W905
Clip for
Hydronic
System
c. The switching subbase, which is removed by unscrewing
themountingscrewsthatholditonthewalloradaptorplate.
ELEC GAS
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, removewallplatefromthewall.Iftheoldthermostat
has a wall mounting plate, remove the thermostat and the wall
mounting plate as an assembly.
W904
Clip for
Celsius Display
Electric/Gas
Switch
Figure 1. Thermostat base
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.
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-6448A
Printed in U.S.A.
0247
MOUNTING AND WIRING
CONTINUED FROM SECOND PAGE
4
THERMOSTAT
SYSTEM
Hot
JUMPER
WIRE
Y
C
B
O
G
W
RC
RH
THERMOSTAT
SYSTEM
Y
C
B
O
G
W
RC
RH
Cooling
System Relay System
Fan
Heating
24 VAC
120 VAC
Neutral
NOTE
Fan
Relay
Heating
System
For Heat only,
attach to RH and W
HEATING
TRANSFORMER
Hot
24 VAC
120 VAC
Neutral
Hot
TRANSFORMER
24 VAC
120 VAC
Neutral
Figure 2. Typical wiring diagram for
heat only, 4-wire, single transformer systems
COOLING TRANSFORMER
Figure 5. Typical wiring diagram for
heat/cool, 6-wire, two-transformer systems
JUMPER
WIRE
THERMOSTAT
Y
C
B
O
G
W
RC
RH
SYSTEM
JUMPER
WIRE
JUMPER
WIRE
THERMOSTAT
SYSTEM
Cooling
System Relay
Fan
Y
C
B
O
G
W
RC RH
Hot
24 VAC
120 VAC
Neutral
Reversing Compressor Fan
Valve*
Contactor Relay
Hot
TRANSFORMER
24 VAC
120 VAC
Neutral
Figure 3. Typical wiring diagram for
cool only, 4-wire, single transformer systems
* Reversing valve is energized when the
system switch is in the COOL position
TRANSFORMER
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
NOTE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
JUMPER
WIRE
JUMPER
WIRE
JUMPER
WIRE
THERMOSTAT
SYSTEM
THERMOSTAT
SYSTEM
Y
C
B
O
G
W
RC RH
Y
C
B
O
G
W
RC RH
Cooling
System Relay
Fan
Heating
System
Reversing Compressor Fan
Valve*
Contactor Relay
Hot
Hot
24 VAC
120 VAC
Neutral
24 VAC
120 VAC
Neutral
* Reversing valve is energized when the
system switch is in the HEAT position
TRANSFORMER
TRANSFORMER
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
Figure 4. Typical wiring diagram for
heat/cool, 5-wire, single transformer systems
CHECK THERMOSTAT OPERATION
5
This thermostat has a time delay between cooling cycles to allow
the head pressure in the compressor to stabilize. If the tempera-
ture 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.
NOTE
To prevent static discharge problems, touch side of ther-
mostattoreleasestaticbuild-upbeforetouchinganykeys.
If at any time during testing your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
If your system does not have a G terminal connection, skip to
1. Move SYSTEM switch to COOL position.
2. Press
to adjust thermostat setting below room tempera-
Heating System.
ture. The blower should come on immediately on high speed,
followed by cold air circulation
1. Turn on power to the system.
2. Move fan switch to ON position. The blower should begin to
3. Press
to adjust temperature setting above room tem-
operate.
perature. The cooling system should stop operating.
3. Move fan switch to AUTO position. The blower should stop
Heating System
immediately.
1. Move SYSTEM switch to HEAT position. If the heating system
Cooling System
has a standing pilot, be sure to light it.
2. Press
to adjust thermostat setting above room tempera-
ture. The heating system should begin to operate.
CAUTION
!
3. Press
to adjust temperature setting below room tem-
To prevent compressor and/or property damage, if the
outdoortemperatureisbelow50°F, DONOToperatethe
cooling system.
perature. The heating system should stop operating.
CHECK THERMOSTAT OPERATION
CONTINUED FROM THIRD PAGE
5
Before you begin programming 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.
1
2
WHITE-RODGERS
The Thermostat Buttons and Switches
TIME PRGM RUN HOLD
FAN
SYSTEM
1
2
3
4
5
6
7
8
(Up arrow) Raises temperature setting.
(Down arrow) Lowers temperature setting.
ON AUTO COOL OFF HEAT
TIME button.
3
4
5
6
7
8
PRGM (program) button.
9
RUN (program) button.
HOLD button.
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
12
11
THE DISPLAY
Indicates day of the week.
9
13
10
is displayed when the SYSTEM switch is in the HEAT
10
position.
is displayed (non-flashing) when the SYSTEM
is displayed (flashing)
Figure 8. Thermostat display, buttons, and switches
switch is in the COOL position.
when the compressor is in lockout mode.
Alternately displays current time and temperature.
11
12 Displayscurrentlyprogrammedsettemperature(thisisblank
button. HOLD will be displayed. Then choose the desired
hold temperature by pressing or . The thermostat
when SYSTEM switch is in the OFF position).
will hold the room temperature at the selected setting until
you press RUN button to start program operation again.
13
The word HOLD is displayed when the thermostat is in the
HOLD mode.
OPERATING FEATURES
CONFIGURATION MENU
6
Now that you are familiar with the thermostat buttons and display,
read the following information to learn about the many features of
the thermostat.
The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal require-
ments.
• SIMULTANEOUSHEATING/COOLINGPROGRAMSTOR-
AGE—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.
Press RUN to make sure the thermostat is in the run program
mode, then press PRGM and RUN at the same time to enter the
configuration menu. The display will show the first item in the
configuration menu.
• TEMPERATURE OVERRIDE—Press
or
until the
display shows the temperature you want. The thermostat will
override current programming and keep the room tempera-
tureattheselectedtemperatureuntilthenextprogramperiod
begins. Then the thermostat will automatically revert to the
program.
The configuration menu table summarizes the configuration op-
tions. An explanation of each option follows.
Press HOLD to change to the next menu item or press TIME to go
backwards to the previous item in the menu. To exit the menu and
return to the program operation, press RUN. If no keys are
pressedwithinfifteenminutes, thethermostatwillreverttonormal
operation.
• HOLDTEMPERATURE—Thethermostatcanholdanytem-
perature within its range for an indefinate period, without
reverting to the programmed temperature. Press HOLD
Configuration Menu
Step
Displayed (Factory Default)
Comments
Press Button(s)
PRGM and RUN
HOLD*
Press
or
SL
to select:
1
2
3
4
5
6
7
(FA)
d-L (ON)
E (ON)
LOC (OFF)
0 HI (0)
(F)
Select FA or SL (Fast or Slow) heating cycle rate
N/A
OFF
OFF
ON
Select Energy Management Recovery OFF or ON
Select compressor lockout OFF or ON
Select temperature display adjustment higher or lower
Select temperature display to F or C
Returns to normal operation
HOLD*
HOLD*
HOLD*
4 LO to 4 HI
C
HOLD*
RUN
* Press HOLD to advance to next item or TIME to move backwards to previous item
1) Select FA or SL (Fast or Slow) Heating Cycle Rate—The
PROGRAMMINGYOUR THERMOSTAT
7
FA setting is frequently used for gas, oil or electric heat. The
SL setting produces a longer heating cycle which is normally
for hot water or steam (hydronic) systems. Both settings
produce very accurate temperature control and can be set to
your personal preference. FA cycles the system just under
1°F and the SL setting cycles at approximately 1.5F°.
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 tempera-
tures to be cooler (warmer) when the building is vacant or
during periods of low activity.
2) Not Available
3) Select Energy Management Recovery OFF or ON—
Energy Management Recovery (EMR) causes the thermo-
stat 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.
• 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 tempera-
tures, follow these steps.
Example: You select EMR and have your heating pro-
grammed 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. Cooling allows more time per
degree because it takes longer to reach temperature.
Determinethetimeperiodsandtemperaturesforyourweekdayand
weekend programs. You must program four periods for both the
weekday and weekend program. However, you may use the same
heatingandcoolingtemperaturesforconsecutivetimeperiods.You
can choose start times, heating temperatures, and cooling tem-
peratures 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.
4) Select Compressor Lockout LOC OFF or ON—Selecting
LOC ON will cause the thermostat to wait 5 minutes before
turning on the compressor if the heating and cooling system
loses power. It will also wait 5 minutes minimum between
cooling cycles. This is intended to help protect the compres-
sor from short cycling. Some newer compressors already
have a time delay built in and do not require this feature. Your
compressormanufacturercantellyouifthefeatureisalready
present in their system. When the compressor time delay
occurs it will flash the
the compressor.
for about five minutes then turn on
Entering Your Program
Follow these steps to enter the heating and cooling programs you
have selected.
5) Select Temperature Display Adjustment 4 LO to 4 HI—
Allows you to adjust the room temperature display 4° higher
or lower. Your thermostat was accurately calibrated at the
factory but you have the option to change the display tem-
perature to match your previous thermostat.
Set Current Time and Day
1. Press TIME button once. The display will show the hour only.
6) Select F° or C° Readout—Changes the display readout to
PM
EXAMPLE:
Centigrade or Fahrenheit as required.
2. Press and hold either
or
until you reach the correct
hour and AM/PM designation (AM begins at midnight; PM
begins at noon).
4. Press and hold either
minutes.
or
until you reach the correct
5. Press TIME once. The display will show the day of the week.
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 currently programmed temperature.
PROGRAMMINGYOUR THERMOSTAT
CONTINUED FROM FIFTH PAGE
7
9. Repeat steps 4 through 8 to complete weekend heating
programming.
6. Press
or
untilyoureachthecurrentdayoftheweek.
7. Press RUN once. The display will show the correct time and
room temperature alternately.
10.When you have completed entering your heating program,
press RUN.
Enter Heating Program
1. Move the SYSTEM switch to HEAT.
Enter Cooling Temperatures
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 for the 1st heating period and
the currently programmed temperature (flashing).
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.
MO TU WE TH FR
AM
1. Move SYSTEM switch to COOL position.
EXAMPLE:
2. Follow the procedure for entering your heating program, using
your selected cooling times and temperature.
This display window shows that for the 1st weekday period,
the start time is 6:00 AM, and 70° is the programmed tempera-
ture (this example reflects factory preprogramming).
Check your programming
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
3. Press
or
to change the displayed temperature to
your selected temperature for the 1st heating program period.
1. Move the SYSTEM switch to HEAT position.
4. Press TIME once (the programmed time will flash). Press
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).
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 tempera-
ture mode.
5. Press PRGM once. The currently programmed start time and
setpoint temperature for the 2nd heating program period will
appear.
3. Press RUN.
4. Move SYSTEM switch to COOL position.
5. Repeat step 2 to check cooling temperatures.
6. Press RUN to beging program operation.
6. Repeat steps 4 and 5 to select the start time and heating
temperature for the 2nd heating program period.
YOURTHERMOSTATISNOWCOMPLETELYPROGRAMMED
AND READY TO AUTOMATICALLY PROVIDE MAXIMUM
COMFORT AND EFFICIENCY!
7. Repeat steps 4 through 6 for the 3rd and 4th heating program
periods. Weekday heating programs are now complete.
SAMPLE
Heating/Cooling Schedule Plan (Factory Program)
Heating/Cooling Schedule Plan
WEEKEND (2 DAY)
WEEKDAY (5 DAY)
WEEKEND (2 DAY)
WEEKDAY (5 DAY)
Start
Time
Start
Time
Start
Time
Start
Time
Period
Temperature
70 F
Temperature
70 F
Period
Temperature
Temperature
1ST
6:00 AM
6:00 AM
1ST
2ND
3RD
4TH
1ST
2ND
3RD
4TH
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
62 F
70 F
62 F
78 F
85 F
78 F
82 F
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
62 F
70 F
62 F
78 F
85 F
78 F
82 F
2ND
3RD
4TH
1ST
2ND
3RD
4TH
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
8
9
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
-40°F to 150°F
20 to 30 VAC 50/60 Hz.
0.05 to 1.2 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
TROUBLESHOOTING
Reset Operation
resets the factory defaults. If the thermostat has power, has been
reset and still does not function correctly contact your heating/
cooling service person or place of purchase.
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermostat
by pressing
,
and TIME at the same time. This also
Symptom
Possible Cause
Corrective Action
No Heat/No Cool/No Fan
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
Replace fuse or reset breaker.
Turn switch to ON.
3. Furnace blower compartment door or
panel loose or not properly installed.
Replace door panel in proper position to engage
safety interlock or door switch.
No Heat
1. Pilot light not lit.
Re-light pilot.
2. System Switch not set to Heat.
Set System Switch to Heat and raise temp above
room temp.
3. Loose connection to thermostat or system.
Verify thermostat and system wires are securely
attached.
4. Furnace Lock-Out Condition. Heat may also
be intermittent.
Many furnaces have safety devices that shut
down when a lock-out condition occurs. If the
heat works intermittently contact the furnace
manufacturer or local service person for
assistance.
No Heat (continued)
5. Heating system requires service or
thermostat requires replacement.
Diagonistic: Set System Switch to Heat and raise
the setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermo-
stat is operating properly. If the thermostat does
not click, try the reset operation listed above. If the
thermostat does not click after being reset contact
your heating and cooling service person or place
of purchase for a replacement. If the thermostat
clicks, contact the furnace manufacturer or a
service person to verify the heating is operating
correctly.
No Cool
1. System Switch not set to Cool.
Set System Switch to Cool and lower temp below
room temp.
2. Loose connection to thermostat or system.
Verify thermostat and system wires are securely
attached.
3. Cooling system requires service or
thermostat requires replacement.
Same procedure as diagnostic for No Heat
condition except set the thermostat to Cool and
lower the setpoint below the room temperature.
There may be up to a five minute delay before the
thermostat clicks in Cooling.
TROUBLESHOOTING
CONTINUED FROM SEVENTH PAGE
Symptom
9
Possible Cause
Corrective Action
Heat, Cool or Fan Runs Constantly.
1. Possible short in wiring.
Check each wire connection to verify they are not
shorted or touching together. No bare wire should
stick out from under terminal screws. Try resetting
the thermostat as described below. If the condition
persists the manufacturer of your system or
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
4. Fan Switch set to Fan On.
service person can instruct you on how to test the
Heat/Cool system for correct operation. If the
system operates correctly, replace the thermostat.
Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
1. The location of the thermostat and/or the
size of the Heating System may be
influencing the cycle rate.
Digital thermostats normally provide precise
temperature control and may cycle faster than
some older mechanical models. A faster cycle
rate means the unit turns on and off more
frequently but runs for a shorter time so there is
no increase in energy use. If you would like to
increase the cycle time, change the cycle rate to
“SL” in the configuration menu. It is not possible to
shorten the cycle time. If an acceptable cycle rate
is not achieved as received or by changing the
cycle rate. Contact a local service person for
additional suggestions.
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
1. The location of the thermostat and the size
of the Cooling System can influence the
cycle rate.
The cycle rate for cooling is fixed and can not be
adjusted. Contact a local service person for
suggestions.
Thermostat Setting and Thermostat
Thermometer Disagree
1. Thermostat thermometer setting requires
adjustment.
The thermometer can be adjusted +/- 4 degrees.
See Temperature Display Adjustment in the
Configuration menu.
Thermostat Does Not Follow Program
1. AM or PM set incorrectly in program.
2. AM or PM set incorrectly on the clock.
3. Voltage spike or static discharge.
Check current clock and program settings
including the AM or PM designations for each
time period. If a voltage spike or a static discharge
occurs use the Reset Operation listed above.
Blank Display and/or Keypad
Not Responding
1. Voltage spike or static discharge.
1. Loss of power to thermostat.
If a voltage spike occurs use the Reset Operation
listed above.
Clock Loses or Gains Time
The thermostat will maintain its program in
memory even with no power but the clock time
will be incorrect when power is restored.
See No Heat/No Cool/No Fan (common problems)
above for items to check in the system.
Heat or Cool Starts Early
1. EMR activated.
See Configuration Menu (Item 4).
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