1F81-51
Programmable Electronic
Digital Multi-stage Thermostat
INSTALLATION AND
WHITE-RODGERS
OPERATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
Your new White-Rodgers 5-Day/2-Day Digital Multi-stage Ther-
mostat uses the technology of a solid-state microcomputer to
provideprecisetime/temperaturecontrol.Thisthermostatoffers
you the flexibility to design heating and cooling programs that fit
your needs.
• Preprogrammed temperature control
• LCD continuously displays set point, and alternately dis-
plays time and room temperature
• Temperature override until next program period
• Manual program override (HOLD temperature)
• °F/°C convertibility
Features:
• Temperature range 45° to 90°F
• Two-stage heat/two-stage cool
• Separate 5-day (weekday) and 2-day (weekend) programming
with four separate time/temperature periods per program
• Simultaneous heat and cool program storage
• Armchair Programming Capability
• Optional C terminal (dual power option)
PRECAUTIONS
CAUTION
Thisthermostatisintendedforusewitha24-voltsystem;donot
use this thermostat with a millivolt or line voltage system. If in
doubt about whether your wiring is millivolt, line, or low voltage,
have it inspected by a qualified heating and air conditioning
contractor or electrician.
!
To prevent electrical shock and/or equipment damage
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
Do not exceed the specification ratings.
WARNING
!
Allwiringmustconformtolocalandnationalelectricalcodesand
ordinances.
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
This control is a precision instrument, and should be handled
carefully. Roughhandlingordistortingcomponentscouldcause
the control to malfunction.
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.
SPECIFICATIONS
ELECTRICAL DATA
APPLICATIONS
Electrical Rating:
For use with:
20 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.5 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
• Heat/cool systems with up to two stages heat, two
stages cool
DO NOT USE WITH:
THERMAL DATA
• Millivolt systems
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
• Systems exceeding 30 VAC and 2.5 amps
• 3-wire zoned hydronic heating systems
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
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
PART NO. 37-5854E
Printed in U.S.A.
Replaces 37-5854D
0004
ST. LOUIS, MISSOURI 63123-5398
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NOTE
NOTE
The following wiring diagrams show typical terminal identifica- Relay contacts shown are thermostatically operated.
tion and wiring. For proper installation, refer to the original
manufacturer's instructions.
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
Thermostat
the batteries once a year with
Control
fresh “AA” Energizer® alkaline
Circuit
batteries.
THERMOSTAT
W2
C*
R
Y
Y2
G
W
SYSTEM
Heat
Relay
Compressor
Contactor
Stage 2
Stage 1
Hot
24 VAC
120 VAC
Neutral
Compressor
Contactor
Stage 1
Heat
Relay
Fan
Relay
TRANSFORMER
Stage 2
Figure 3. Typical wiring diagram for single transformer systems
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
CUT AND
TAPE OFF!
W2
C*
R
Y
Y2
G
W
Hot
Heat
Relay
Compressor
Contactor
Stage 2
120 VAC
24 VAC
Stage 1
Hot
Neutral
24 VAC
120 VAC
TRANSFORMER
Compressor
Contactor
Stage 1
Heat
Relay
Neutral
TRANSFORMER
Fan
Relay
Stage 2
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
* The 24 Volt neutral connection
Thermostat
to terminal C on the thermostat
Control
is not required if you replace
Circuit
the batteries once a year with
fresh “AA” Energizer® alkaline
THERMOSTAT
SYSTEM
batteries.
W2
C*
R
Y
Y2
G
W
Heat
Relay
Compressor
Contactor
Stage 2
Limit or
Safety
Switches
Stage 1
Limit or
Safety
Switches
Hot
24 VAC
120 VAC
Neutral
Compressor
Contactor
Stage 1
Heat
Relay
Fan
24 VAC
Accessory
Relay N.O.
Contact
HEATING
TRANSFORMER
Relay
Stage 2
Common
Limit or
Safety
Switches
Limit or
Safety
Switches
Hot
TWO COMMONS MUST
BE JUMPERED TOGETHER!
24 VAC
120 VAC
Common
Neutral
COOLING
TRANSFORMER
Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
3
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Ifthefanisrunningbutthecompressorisnotrunningandthe
word COOL is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to temporarily
override the compressor lockout feature during testing).
CHECK THERMOSTAT OPERATION
NOTE
If at any time during testing, your system does not operate
properly, contact a qualified serviceperson.
3. Press
toadjusttemperaturesettingaboveroomtempera-
ture. The cooling system should stop operating.
Fan Operation
NOTE
1. Turn on power to the system.
During normal operation, the second stage of heat or cool may
take 15 to 30 minutes to turn on. The delay varies depending on
theperformanceofthefirststage.Typicallythesecondstagewill
comeonsoonerinmoresevereweather,whileinmilderweather
it will take longer. There is no adjustment to this feature, as it is
designed to maximize both comfort and efficiency.
2. Move SYSTEM switch to OFF position.
3. MoveFANswitchtoON.Theblowershouldbegintooperate.
4. Move FAN switch to AUTO position. The blower should stop
within a short period of time.
Heating System
1. Move SYSTEM switch to HEAT position
LOCKOUT BYPASS OPTION
2. Press
toadjustthermostatsettingto90° andholdforfive
seconds. Both stages of the heating system should begin to
operate within five seconds.
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY.OPERATORSSHOULDNOTUSETHISFEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
3. Press
toadjusttemperaturesettingbelowroomtempera-
ture. The auxiliary heating system will stop immediately and
the first stage will stop within three to four minutes.
COMPRESSOR SHORT TERM
CYCLE PROTECTION
Cooling System
CAUTION
!
During normal operation, this thermostat has a built-
in short term (5-minute) time delay. During this 5-
minute period, the thermostat will lock out the com-
pressortoallowheadpressuretostabilize. Ifyouwant
tooverridethisfeaturewhiletestingthermostatopera-
Topreventcompressorand/orpropertydamage, ifthe
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Move SYSTEM switch to COOL position.
tion, simply press and buttons at the same time.
2. Press
toadjustthermostatsettingto45° andholdforfive
seconds. The blower should come on immediately on high
speed, followed by cold air circulation. Both stages of the
cooling system should begin to operate (if you have a two-
stage cooling system).
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESSTHECOMPRESSOROILHEATERSHAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
4
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OPERATION
Before you begin programming your thermostat, you should be
familiarwithitsfeaturesandwiththedisplayandthelocationand
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
THE THERMOSTAT BASE
SET TIME VIEW PRGM RUN PRGM HOLD TEMP
FAN ON
AUTO
SYSTEM
Other than
and
, the following buttons and switches are
COOL-OFF-HEAT
located behind the door on the bottom of the thermostat cover
(see fig. 6). Pull the door down to open it.
The Thermostat Buttons and Switches
3
4
5
6
7
8
9
(Red arrow) Raises temperature setting.
(Blue arrow) Lowers temperature setting.
SET TIME button.
1
2
3
4
5
6
7
8
9
10
MO TU WE TH FR
AM
SA SU
HEAT 1+2
11
HOLD COOL 1+2
VIEW PRGM (program) button.
RUN PRGM (program) button.
HOLD TEMPerature button.
12
11 13 10
Figure 6. Thermostat display, buttons, and switches
• HOLD TEMPERATURE — The thermostat can hold any
temperaturewithinitsrangeforanindefiniteperiod, without
reverting to the programmed temperature. Press HOLD
TEMP button. HOLD will be displayed. Then choose the
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
The Display
desired hold temperature by pressing
or
. The ther-
mostat will hold the room temperature at the selected
setting until you press RUN PRGM button to start program
operation again.
Indicates day of the week.
9
HEATisdisplayedwhentheSYSTEMswitchisintheHEAT
10
• °F/°C CONVERTIBILITY — Press SET TIME and HOLD
TEMP buttons until the temperature display is in Celsius
(°C). To display Fahrenheit (°F), repeat the process.
position. COOL is displayed when the SYSTEM switch is in
the COOL position. COOL is displayed (flashing) when the
compressor is in lockout mode.
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostathasbeenaccuratelysetinourfactory.However,
if you wish, you may adjust your new thermostat tempera-
ture display to match your old thermostat. This can be
accomplished (within a ±4°F range) as follows:
Alternately displays current time and room temperature.
11
12
Displays currently programmed set temperature (this is
blank when SYSTEM switch is in the OFF position).
1. Press VIEW PRGM and HOLD TEMP buttons at the
same time.
The word HOLD is displayed when the thermostat is in the
13
HOLD mode.
2. Press
or
to adjust the displayed temperature to
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.
your desired setting.
3. Press RUN PRGM to resume normal program opera-
tion.
PROGRAMMING YOUR THERMOSTAT
• SIMULTANEOUS HEATING/COOLING PROGRAM
STORAGE—Whenprogramming,youcanenterbothyour
heating and cooling programs at the same time. There is no
need to reprogram the thermostat at the beginning of each
season.
Now you are ready to program your thermostat. This section will
help you plan your thermostat’s program to meet your needs.
For maximum comfort and efficiency, keep the following guide-
lines in mind when planning your program.
• When heating (cooling) your building, program the tem-
peratures to be cooler (warmer) when the building is vacant
or during periods of low activity.
• TEMPERATURE OVERRIDE — Press
or
until the
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 automati-
cally revert to the program.
• During early morning hours, the need for cooling is usually
minimal.
(Instructions continue on page 6.)
5
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Look at the factory preprogrammed times and temperatures 3. Press SET TIME once. The display window will show the
shown below. If this program will suit your needs, simply press the
RUN PRGM button to begin running the factory preset program.
minutes only.
EXAMPLE:
FACTORY PREPROGRAMMING
Cooling Program for
Heating Program for
ALL days of the Week:
ALL Days of the Week:
TEMP
PERIOD
TIME
TEMP
PERIOD
1st
2nd
3rd
4th
TIME
4. Press and hold either
minutes.
or
until you reach the correct
70°F
62°F
70°F
62°F
1st
2nd
3rd
4th
6:00 AM
8:00 AM
5:00 PM
10:00 PM
6:00 AM
8:00 AM
5:00 PM
10:00 PM
78°F
85°F
78°F
82°F
5. Press SET TIME once. The display will show the day of the
week.
If you want to change the preprogrammed times and tempera-
tures, follow these steps.
6. Press
or
until you reach the current day of the week.
Determine the time periods and heating and cooling tempera-
tures for your weekday and weekend programs. You must
program four periods for both the weekday and weekend pro-
7. Press RUN PRGM once. The display will show the correct
time and room temperature alternately.
gram. However, you may use the same heating and cooling Enter Heating Program
temperatures for consecutive time periods. You can choose
1. If you want to change the display from Fahrenheit to Celsius
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).
(or vice-versa), press SET TIME and HOLD TEMP at the
same time.
2. Move the SYSTEM switch to HEAT.
3. Press VIEW PRGM once. “MO TU WE TH FR” (indicating
weekday program) will be displayed. Also displayed are
the currently programmed start time for the 1st heating
period and the currently programmed temperature (flash-
ing).
Usethetableatthebottomofthepagetoplanyourprogramtime
periods,andthetemperaturesyouwantduringeachperiod.You
may also want to look at the sample program table to get an idea
of how the thermostat can be programmed.
MO TU WE TH FR
AM
EXAMPLE:
Entering Your Program
This display window shows that for the 1st weekday period,
the start time is 6:00 AM, and 70° is the programmed
temperature(thisexamplereflectsfactorypreprogramming).
Follow these steps to enter the heating and cooling programs
you have selected.
Set Current Time and Day
4. Press
or
to change the displayed temperature to your
selected temperature for the 1st heating program period.
5. Press SET TIME once (the programmed time will flash).
1. Press SET TIME button once. The display will show the hour
only.
Press
or
untilyourselectedtimeisdisplayed. Thetime
PM
EXAMPLE:
will change in 15 minute increments. When your selected
time is displayed, press SET TIME again to return to the
change temperature mode.
2. Press and hold either
or
until you reach the correct
6. Press VIEW PRGM once. The currently programmed start
time and setpoint temperature for the 2nd heating program
period will be displayed.
hour and AM/PM designation (AM begins at midnight; PM
begins at noon).
SAMPLE
Heating/Cooling Schedule Plan
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
Temperature
Period
Temperature
Temperature
1ST HEAT
1ST HEAT
5:30 AM
70°F
7:00 AM
11:00 AM
6:00 PM
11:30 PM
7:00 AM
12:30 PM
6:00 PM
11:30 PM
70°F
2ND HEAT
3RD HEAT
4TH HEAT
1ST COOL
2ND COOL
3RD COOL
4TH COOL
2ND HEAT 8:00 AM
3RD HEAT 5:00 PM
4TH HEAT 10:30 PM
1ST COOL 6:30 AM
2ND COOL 2:00 PM
3RD COOL 5:00 PM
4TH COOL 10:30 PM
65°F
70°F
65°F
76°F
78°F
72°F
78°F
70°F
70°F
65°F
76°F
74°F
72°F
78°F
6
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7. Repeat steps 4 and 5 to select the start time and heating
temperature for the 2nd heating program period.
CHECK YOUR PROGRAMMING
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
8. Repeatsteps4through6forthe3rdand4thheatingprogram
periods. Weekday heating programs are now complete.
1. Move SYSTEM switch to HEAT position.
9. Press VIEW PRGM once. “SA SU” (indicating weekend
program) will be displayed, along with the start time for the
1st heating period and the currently programmed tempera-
ture.
2. Press VIEW PRGM to view the 1st weekday heating period
time and temperature. Each time you press VIEW PRGM,
the next heating period time and temperature will be dis-
played in sequence for weekday, then weekend program
periods(youmaychangeanytimeortemperatureduringthis
procedure).
10.Repeat steps 4 through 8 to complete weekend heating
programming.
11.When you have completed entering your heating program,
press RUN PRGM.
3. Press RUN PRGM.
4. Move SYSTEM switch to COOL position.
5. Repeat step 2 to check cooling temperatures.
6. Press RUN PRGM to begin program operation.
Enter Cooling Program
CAUTION
!
YOUR THERMOSTAT IS NOW COMPLETELY PRO-
GRAMMED AND READY TO AUTOMATICALLY PROVIDE
MAXIMUM COMFORT AND EFFICIENCY!
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.
TROUBLESHOOTING
1. Move SYSTEM switch to COOL position.
If your thermostat’s display is frozen, blank or displaying incor-
rectly, the thermostat may have been affected by static dis-
charge or voltage variations. If this happens, press the RESET
button (see fig. 2, page 2 for the location of the button). Pressing
the RESET button will clear all user programming. The thermo-
stat will revert to factory preprogramming. You will need to reset
the time and, if desired, reprogram the thermostat to your
selected program. If pressing the RESET button does not
correct the problem, contact a qualified service technician.
2. Follow the procedure for entering your heating program,
using your selected cooling times and temperatures.
For optimum performance, we recommend replacing batteries
once a year with fresh “AA” Energizer® alkaline batteries.
7
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