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1F87-251  
Programmable Electronic Digital Thermostat  
INSTALLATION AND  
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 7-Day Digital Thermostat uses the  
technology of a solid-state microcomputer to provide precise  
time/temperature control. This thermostat offers you the flexibil-  
ity to design heating and cooling programs that fit your needs.  
• Temperature override until next program period  
• Manual program override (HOLD temperature)  
• °F/°C convertibility  
• Temperature range 45° to 90°F  
• RC, RH, W, Y, G , O and B terminals  
Features:  
• Separate program for each day of the week with four separate  
time/temperature settings per day  
• B and O terminals for single stage heat pumps (no auxiliary  
heat) or damper operation  
• Simultaneous heat and cool program storage  
• Preprogrammed temperature control  
• LCD continuously displays setpoint, and alternately dis-  
plays time and room temperature  
• Program storage in case of power loss.  
• Battery powered (2 "AA" Energizer® alkaline batteries in-  
cluded)  
• Backlit display  
PRECAUTIONS  
This thermostat is intended for use with a low voltage system;  
do not use this thermostat with a line voltage system. If in doubt  
about whether your wiring is millivolt, line, or low voltage, have  
itinspectedbyaqualifiedheatingandairconditioningcontractor  
or electrician.  
WARNING  
!
Do not use on circuits exceeding specified voltage.  
Higher voltage will damage control and could cause  
shock or fire hazard.  
Do not exceed the specification ratings.  
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.  
Allwiringmustconformtolocalandnationalelectricalcodesand  
ordinances.  
This control is a precision instrument, and should be handled  
carefully. Rough handling ordistortingcomponents could cause  
the control to malfunction.  
Thermostat installation and all components of the  
system shall conform to Class II (current limited) cir-  
cuits per the NEC code. Failure to do so may cause a  
fire hazard.  
CAUTION  
!
To prevent electrical shock and/or equipment dam-  
age, disconnect electric power to system at main fuse  
or circuit breaker box until installation is complete.  
SPECIFICATIONS  
ELECTRICAL DATA  
APPLICATIONS  
Electrical Rating:  
For use with:  
8 to 30 VAC 50/60 Hz. or D.C.  
0.05 to 1.0 Amps (Load per terminal)  
1.5 Amps Maximum Total Load (All terminals combined)  
•
•
•
•
Standard heat/cool or heat only systems  
Electric heat systems  
Gas or oil fired systems  
Gas systems with intermittent ignition devices (I.I.D.)  
and/or vent dampers  
Hydronic (hot water or steam) systems  
Single-stage heat pump systems (no auxiliary heat)  
Millivolt systems  
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:  
-4°F to 150°F  
•
•
•
DO NOT USE WITH:  
•
•
•
Multi-stage systems  
Systems exceeding 30 VAC and 1.5 amps  
3-wire zoned hydronic heating systems  
WHITE-RODGERS  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
ST. LOUIS, MISSOURI 63123-5398  
www.white-rodgers.com  
PART NO. 37-6417C  
Replaces 37-6417B  
0441  
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INSTALLATION  
REMOVE OLD THERMOSTAT  
Screw anchors  
1. Shut off electricity at the main fuse box until installation is  
complete. Ensure that electrical power is disconnected.  
2. Remove the front cover of the old thermostat. With wires  
still attached, remove wall plate from the wall. If the old  
thermostathasawallmountingplate,removethethermostat  
and the wall mounting plate as an assembly.  
3. Identify each wire attached to the old thermostat using  
the labels enclosed with the new thermostat.  
4. Disconnect the wires from old thermostat one at a time. DO  
NOT LET WIRES FALL BACK INTO THE WALL.  
5. Install new thermostat using the following procedures.  
Mounting  
holes  
ATTENTION!  
Electric/Gas  
switch  
This product does not contain mercury. However, this product  
may replace a unit which contains mercury.  
Mounting  
holes  
Do not open mercury cells. If a cell becomes damaged, do not  
touch any spilled mercury. Wearing nonabsorbent gloves, take  
upthespilledmercurywithsandorotherabsorbentmaterialand  
place into a container which can be sealed. If a cell becomes  
damaged, the unit should be discarded.  
Figure 1. Thermostat Base  
6. Push excess wire into wall and plug hole with a fire-resistant  
material(suchasfiberglassinsulation)topreventdraftsfrom  
affecting thermostat operation.  
Mercury must not be discarded in household trash. When the  
unit this product is replacing is to be discarded, place in a  
suitablecontainerandreturntoWhite-Rodgersat2895Harrison  
Street, Batesville, AR, 72501-2117 for proper disposal.  
BATTERY LOCATION  
ELECTRIC HEAT OR SINGLE-STAGE  
HEAT PUMP SYSTEMS  
2 "AA" alkaline batteries are included in the thermostat at the  
factory with a battery tag to prevent power drainage. You must  
remove the battery tag to engage the batteries.  
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  
heat or heat-pump system that REQUIRES the thermostat to  
turn on the fan on a call for heat, locate the ELECTRIC/GAS  
switch on the back of the thermostat (see fig. 1) and switch it to  
the ELECTRIC position. This will allow the thermostat to ener-  
gize 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.  
If "LO BATT" is displayed, the batteries are low and should be  
replaced with fresh "AA" Energizer® alkaline batteries. To re-  
place batteries, install the batteries along the top of the base  
(see Fig. 1). The batteries must be installed with the positive (+)  
end to the left.  
HYDRONIC (HOT WATER OR STEAM)  
HEATING SYSTEMS  
This thermostat is set to operate properly with a forced-air  
heatingsystem.Ifyouhaveahydronicheatingsystem(asystem  
that heats with hot water or steam), you must set the thermostat  
tooperate properly with your system. Changethe second option  
in the configuration menu to SL (see CONFIGURATIONMENU,  
ATTACH THERMOSTAT BASE TO WALL  
1. Remove the packing material from the thermostat. Gently page 4).  
pull the cover straight off the base. Forcing or prying on the  
thermostatwillcausedamagetotheunit. Ifnecessary, move  
CHECK THERMOSTAT OPERATION  
the electric heat switch (see ELECTRIC HEAT SYSTEMS,  
above).  
If at any time during testing your system does not operate  
properly, contact a qualified service person.  
2. Connect wires beneath terminal screws on base using  
appropriate wiring schematic (see figs. 2 through 7).  
Turn on power to the system.  
3. Place base over hole in wall and mark mounting hole  
locations on wall using base as a template.  
Fan Operation  
4. Move base out of the way. Drill mounting holes.  
If your system does not have a G terminal connection, skip to  
Heating System.  
5. Fasten base loosely to wall, as shown in fig. 1, using two  
mounting screws. Place a level against bottom of base,  
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.  
1. Move FAN switch to ON position. The blower should begin  
to operate.  
2. Move FAN switch to AUTO position. The blower should stop  
immediately.  
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JUMPER  
WIRE  
THERMOSTAT  
Y
B
O
G
W
RC  
RH  
THERMOSTAT  
SYSTEM  
SYSTEM  
Y
B
O
G
W
RC  
RH  
Hot  
Cooling  
System Relay System  
Fan  
Heating  
24 VAC  
120 VAC  
Neutral  
Fan  
Relay  
Heating  
System  
Hot  
HEATING TRANSFORMER  
(Class II Current Limited)  
24 VAC  
120 VAC  
Neutral  
NOTE  
For 2-wire Heat only,  
attach to RH and W  
Hot  
TRANSFORMER  
(Class II Current Limited)  
24 VAC  
120 VAC  
Neutral  
Figure 2. Typical wiring diagram for  
heat only, 3-wire, single transformer systems  
COOLING TRANSFORMER  
(Class II Current Limited)  
Figure 5. Typical wiring diagram for  
heat/cool, 5-wire, two-transformer systems  
JUMPER  
WIRE  
THERMOSTAT  
Y
B
O
G
W
RC  
RH  
SYSTEM  
JUMPER  
WIRE  
JUMPER  
WIRE  
Cooling  
System  
Fan  
Relay  
THERMOSTAT  
SYSTEM  
Hot  
Y
B
O
G
W
RC RH  
24 VAC  
120 VAC  
Neutral  
Reversing Compressor Fan  
Valve*  
Contactor Relay  
TRANSFORMER  
(Class II Current Limited)  
Hot  
24 VAC  
120 VAC  
Neutral  
Figure 3. Typical wiring diagram for  
cool only, 3-wire, single transformer systems  
* Reversing valve is energized when the  
system switch is in the COOL position  
TRANSFORMER  
(Class II Current Limited)  
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  
Y
B
O
G
W
RC RH  
THERMOSTAT  
SYSTEM  
Y
B
O
G
W
RC RH  
Cooling  
System  
Fan  
Relay  
Heating  
System  
Reversing Compressor Fan  
Valve*  
Contactor Relay  
Hot  
Hot  
24 VAC  
24 VAC  
120 VAC  
Neutral  
120 VAC  
Neutral  
* Reversing valve is energized when the  
system switch is in the HEAT position  
TRANSFORMER  
(Class II Current Limited)  
TRANSFORMER  
(Class II Current Limited)  
Figure 7. Typical wiring diagram for heat pump  
with reversing valve energized in HEAT  
Figure 4. Typical wiring diagram for  
heat/cool, 4-wire, single transformer systems  
Heating System  
Cooling System  
1. Move SYSTEM switch to HEAT position. If the heating  
CAUTION  
!
system has a standing pilot, be sure to light it.  
Topreventcompressorand/orpropertydamage, ifthe  
outdoor temperature is below 50°F, DO NOT operate  
the cooling system.  
2. Press  
to adjust thermostat setting above room tempera-  
ture. The heating system should begin to operate.  
3. Press  
to adjust temperature setting below room tem-  
1. Move SYSTEM switch to COOL position.  
perature. The heating system should stop operating.  
2. Press  
to adjust thermostat setting below room tem-  
perature. The blower should come on immediately on high  
speed, followed by cold air circulation  
3. Press  
to adjust temperature setting above room tem-  
perature. The cooling system should stop operating.  
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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, pullitstraightoutfromthebase. Toreplacethecover, line  
up the cover with the base and press until the cover snaps onto  
the base.  
1
2
The Thermostat Buttons and Switches  
FAN  
SYSTEM  
TIME  
PRGM  
RUN  
HOLD  
1
2
3
4
5
6
7
8
Raises temperature setting.  
Lowers temperature setting.  
ON AUTO COOL OFF HEAT  
Fltr  
8
3
4
5
6
7
TIME button.  
9
9
PRGM (program) button.  
MO TU WE TH FR  
SA SU  
AM  
RUN (run program) button.  
HOLD temperature button.  
FAN switch (ON, AUTO).  
PM  
FLTR  
HOLD  
BATT  
15 12  
10  
13 12 11 10  
14  
Figure 8. Thermostat display, buttons, and switches  
SYSTEM switch (COOL, OFF, HEAT).  
Press HOLD to change to the next menu item or press TIME to  
go backwards to the previous itemin the menu. To exit the menu  
and return to the program operation, press RUN. If no keys are  
pressed within fifteen minutes, the thermostat will revert to  
normal operation.  
The Display  
9
Indicates day of the week.  
10  
Flame icon ( ) is displayed when the SYSTEM switch is in  
the HEAT position. Snowflake icon ( )is displayed (non-  
flashing)whentheSYSTEMswitchisintheCOOLposition.  
Snowflake is displayed (flashing) if the thermostat is in  
lockout mode to prevent the compressor from cycling too  
quickly.  
1) Select FA or SL (Fast or Slow) Heating Cycle Rate - The  
FA setting is frequently used for gas, oil or electric heat. The  
SL setting produces a longer heating cycle which is nor-  
mally 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 approxi-  
mately 1.5°F.  
11  
12  
Displays "LO BATT" when the 2 "AA" batteries are low and  
should be replaced. Nothing else will be displayed.  
2) Select backlit display - The display backlight improves  
display contrast in low lighting conditions. Selecting back-  
light ON will keep the light on for a short period of time after  
any key is pressed. Selecting OFF will keep the light off.  
Alternatelydisplayscurrenttimeandtemperature.Displays  
"LO" in the minutes field when batteries are low.  
13 The word "HOLD" is displayed when the thermostat is in  
the HOLD mode.  
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.  
14  
Displays currently programmed set temperature (this is  
blank when SYSTEM switch is in the OFF position).  
15  
Displays "FLTR" when the system has run for the pro-  
grammedfiltertimeperiodasaremindertochangeorclean  
your air filter.  
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.  
CONFIGURATION MENU  
The configuration menu allows you to set certain thermostat  
operating characteristics to your system or personal require-  
ments.  
4) Select filter replacement run time - The thermostat will  
display "FLTR" after a set time of operation. This is a  
reminder to change or clean your air filter. This time can be  
set from 0 to 1950 hours in 50 hour increments. A selection  
of000willcancelthisfeature. When "FLTR"isdisplayed,  
you can clear it by pressing HOLD and RUN at the same  
time. This resets the timer and starts counting the hours  
until the next filter change. Changing the time in the menu  
also resets the timer.  
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.  
The configuration menu table summarizes the configuration  
options. An explanation of each option follows.  
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Configuration Menu  
Step  
Press Button(s)  
Displayed (Factory Default) Press  
or  
SL  
to select:  
COMMENTS  
Select FA or SL (Fast or Slow) heating cycle rate  
1
PRGM  
and RUN  
(FA)  
d-L  
(ON)  
2
3
4
5
6
HOLD  
*
OFF  
OFF  
Select display backlight OFF or ON  
E
(ON)  
Select Energy Management Recovery OFF or ON  
HOLD  
*
*
HOLD  
Filter  
(000)  
0 to 1950 hours  
(in 50 hour increments)  
Select filter replacement run time  
HOLD  
HOLD  
HOLD  
RUN  
*
*
*
LOC  
(OFF)  
ON  
Select Compressor lockout OFF or ON  
Select temperature display adjustment higher or lower  
0 HI  
(0)  
4 LO to  
4 HI  
7
8
Select temperature display to F or C  
Returns to normal operation  
(F)  
C
* Press HOLD to advance to next item or TIME to move backwards to previous item  
5) 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  
coolingcycles. Thisisintendedtohelpprotectthecompres-  
the desired temperature by pressing  
or  
. The  
thermostat will hold the room temperature at the selected  
setting until you press RUN button to start program opera-  
tion again.  
• LOW BATTERY INDICATOR—If the 2 “AA” alkaline bat-  
teries are low and should be replaced, the display will be  
blank except for “LO BATT”. When the batteries are low,  
pressing any button will cause the display to operate for ten  
seconds. After ten seconds, the displaywill be blankexcept  
for “LO BATT”. You cannot program with low batteries, but  
you can override setpoint temperature. After “LO BATT”  
has been displayed for 4 weeks, the thermostat will raise  
the temperature 10 degrees above your setpoint on COOL  
mode and will drop temperature 10 degrees below your  
setpoint on HEAT mode.  
sor from short cycling. Some newer compressors already  
have a time delay built in and do not require this feature.  
Your compressor manufacturer can tell you if the feature is  
already present in their system. When the compressor time  
delay occurs it will flash the (snowflake icon) for about five  
minutes then turn on the compressor.  
6) 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  
temperature to match your previous thermostat.  
• SIMPLIFIED COPY DAY FUNCTION — This feature al-  
lows Monday's program to be copied into the rest of the  
week's programming. This feature is available the first  
time you program your thermostat. To use this feature,  
simply enter the program for Monday as described in  
PROGRAMMING YOUR THERMOSTAT, and then press  
RUN or HOLD. The only way to restore this feature is to  
complete a software reset (see Reset Operation under  
TROUBLESHOOTING section).  
7) Select F° or C° Readout - Changes the display readout to  
Centigrade or Fahrenheit as required.  
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—Whenprogramming,youcanenterbothyour  
heating and cooling programs at the same time. There is no  
need to reprogram the thermostat at the beginning of each  
season.  
• COPY DAY FUNCTION — This feature allows a selected  
day's program to be copied to the desired day's program-  
ming. To use this feature: in PRGM mode, select the day  
to be copied from by pressing the HOLD button. Enter the  
program for the selected day as described in PROGRAM-  
MING YOUR THERMOSTAT. Press and hold the TIME  
button for 4 seconds to begin the Copy mode. The LCD will  
display "COPY" and the selected day to be copied. The  
day the program will copy to will be flashing. Press the  
HOLD button to select the day you want to copy to. Press  
TIME to complete the Copy Day operation and return to  
PRGM mode. Press RUN to exit.  
• TEMPERATUREOVERRIDE—Press  
or  
untilthe  
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.  
• HOLD TEMPERATURE — The thermostat can hold any  
temperature within its range for an indefinite period without  
reverting to the programmed temperature. Momentarily  
pressHOLDbutton."HOLD"willbedisplayed.Thenchoose  
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Entering Your Program  
PROGRAMMING YOUR THERMOSTAT  
Follow these steps to enter the heating and cooling programs  
you have selected.  
This section will help you plan your thermostat’s program to  
meetyourneeds.Formaximumcomfortandefficiency,keepthe  
following guidelines in mind when planning your program.  
Set Current Time and Day  
• When heating (cooling) your building, program the tem-  
peratures to be cooler (warmer) when the building is vacant 1. PressTIMEbuttononce. Thedisplaywillshowthehouronly.  
or during periods of low activity.  
• During early morning hours, the need for cooling is usually  
minimal.  
PM  
EXAMPLE:  
2. Press and hold either  
or  
until you reach the correct  
Planning Your Program  
hour and AM/PM designation (AM begins at midnight; PM  
Look at the factory preprogrammed times and temperatures  
shown in the sample schedule. If this program will suit your  
needs, simply press the RUN button to begin running the factory  
preset program.  
begins at noon).  
3. Press TIME once. The display window will show the minutes  
only.  
If you want to change the preprogrammed times and tempera-  
tures, follow these steps.  
EXAMPLE:  
Determine the time periods and temperatures for your week-  
day and weekend programs. You must program four periods  
foreachdayprogram. However, youmayusethesameheating  
and cooling temperatures for consecutive time periods. You  
can choose start times, heating temperatures, and cooling  
temperatures independently for each day programs (for ex-  
ample, you may select 5:00 AM and 70° as the Monday 1st  
period heating start time and temperature, and also choose  
7:00 AM and 76° as the Monday 1st period cooling start time  
and temperature).  
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.  
6. Press or untilyoureachthecurrentdayoftheweek.  
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.  
Use the following table to plan your program time periods and  
the temperatures you want during each period. Fill in the  
complete table to have a record of your programs.  
2. Press PRGM once. “MO” (indicating Monday 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).  
SAMPLE  
MO  
Heating/Cooling Schedule Plan (Factory Program)  
AM  
EXAMPLE:  
ALL DAYS OF THE WEEK  
Start Time  
6:00 AM  
8:00 AM  
5:00 PM  
10:00 PM  
6:00 AM  
8:00 AM  
5:00 PM  
10:00 PM  
Temperature  
70° F  
This display window shows that for Monday's 1st heating  
period, the start time is 6:00 AM, and 70° is the programmed  
temperature(thisexamplereflectsfactorypreprogramming).  
Period  
1ST  
2ND  
3RD  
4TH  
1ST  
2ND  
3RD  
4TH  
62° F  
3. Press  
or  
to change the displayed temperature to  
70° F  
yourselectedtemperatureforMonday's1stheatingprogram  
period.  
62° F  
4. Press TIME once (the programmed time will flash). Press  
78° F  
or  
until your selected start time for Monday's 1st  
85° F  
heating program period appears. The time will change in 15  
minute increments. When your selected time is displayed,  
pressTIMEagaintoreturntothechangetemperaturemode.  
78° F  
82° F  
Heating/Cooling Schedule Plan  
PERIOD 2  
PERIOD 1  
PERIOD 3  
PERIOD 4  
HEAT  
Time Temp  
COOL  
Time Temp  
HEAT  
Time Temp  
COOL  
Time Temp  
HEAT  
Time Temp  
COOL  
Time Temp  
HEAT  
Time Temp  
COOL  
Time Temp  
Mon  
Tues  
Wed  
Thur  
Fri  
Sat  
Sun  
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5. Press PRGM once. The currently programmed start time  
and setpoint temperature for the Monday's 2nd heating  
program period will appear.  
CHECK YOUR PROGRAMMING  
Follow these steps to check your thermostat programming one  
final time before beginning thermostat operation.  
6. Repeat steps 3 and 4 to select the start time and heating  
temperature for Monday's 2nd heating program period.  
1. Move SYSTEM switch to HEAT position.  
2. PressPRGMtoviewthe1stMondayheatingperiodtimeand  
temperature. Each time you press PRGM, the next heating  
period time and temperature will be displayed in sequence  
for Monday. Press HOLD to display Tuesday's 1st heating  
period, and press PRGM to view each of the remaining  
Tuesday's heating period time and temperatures. To view  
ech day's heating program, press HOLD to change day and  
them press PRGM to look at wach programming period for  
the day. (You may change any time or temperature during  
this procedure.)  
7. Repeatsteps3through5forthe3rdand4thheatingprogram  
periods. Monday heating programs are now complete.  
NOTE  
If you are programming your thermostat for thefirst time andyou  
want programming for all days of the week to be the same as  
Monday's program, press RUN or HOLD at this point, and  
proceed to Enter Cooling Program. (This simplified COPY  
DAY feature only works the first time you program your thermo-  
stat. If you want to copy one day's programming to a specific day  
programming, refer to COPY DAY FUNCTION in OPERATING  
FEATURES. If you are changing your thermostat's program-  
ming, you must program each day separately.)  
3. Press RUN.  
4. Move SYSTEM switch to COOL position.  
5. Repeat step 2 to check cooling program.  
6. Move SYSTEM switch to HEAT or COOL and press RUN to  
8. Press HOLD once. “TU” (indicating Tuesday program) will  
begin program operation.  
appear in the display, along with the start time for the 1st  
heating period and the currently programmed temperature. YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND  
READY TO PROVIDE MAXIMUM COMFORT AND EFFICIENCY!  
9. Repeat steps 3 through 7 to complete Tuesday's heating  
programming.  
10.Continue entering each day's programming until all heating  
periods time and temperatures have been entered.  
11.When you have completed entering your heating program,  
press RUN.  
Enter Cooling Program  
CAUTION  
!
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 cooling program,  
using your selected cooling times and temperatures.  
TROUBLESHOOTING  
Batteries  
Reset Operation  
For optimum performance, we recommend replacing batteries  
If a voltage spike or static discharge blanks out the display or  
causes erratic thermostat operation you can reset the thermo-  
once a year with fresh "AA" Energizer® alkaline batteries.  
stat by pressing  
,
and TIME at the same time. This also  
resets the factory defaults to the configuration menu and  
program. If the thermostat has power, has been reset and still  
does not function correctly contact your heating/cooling ser-  
vice person or place of purchase.  
7
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TROUBLESHOOTING (cont.)  
Symptom  
o Heat/No Cool/No Fan  
(common problems)  
Possible Cause  
1. Blown fuse or tripped circuit breaker.  
2. Furnace power switch to OFF.  
Corrective Action  
Replace fuse or reset breaker.  
Turn switch to ON.  
N
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 setpoint  
above room temperature.  
3. Loose connection to thermostat or system.  
4. Furnace Lock-Out Condition. Heat may also  
be intermittent.  
Verify thermostat and system wires are securelyAttached.  
Many furnaces have safety devices that shut the system  
down when a lock-out condition occurs. If the heat works  
intermittently contact the furnace manufacturer or local  
service person for assistance.  
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 thermostat 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 system is  
operating correctly.  
No Cool  
1. SYSTEM Switch not set to COOL.  
Set SYSTEM Switch to COOL and lower setpoint below  
room temperature.  
2. Loose connection to thermostat or system.  
3. Cooling System requires service or thermostat  
requires replacement.  
Verify thermostat and system wires are securely attached.  
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 if  
the compressor lock-out option is selected in the  
configuration menu (Item 6).  
Heat, Cool or Fan Runs Constantly  
1. FAN Switch set to Fan ON.  
2. Possible short in wiring.  
3. Possible short in thermostat.  
4. Possible short in Heat/Cool/Fan system.  
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. If the condition persists  
the manufacturer of your system or 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 can influence the cyclerate.  
Item 2 in the Configuration Menu is the adjustment  
that controls the cycle rate. If an acceptable cycle  
rate is not achieved using the FA (Fast) or SL  
(Slow) adjustment contact a local service person for  
additionalsuggestions.  
Cooling Cycles Too Fast or Too Slow  
(narrow or wide temperature swing)  
1. The location of the thermostat and/or the size of the  
Cooling System may be influencing thecycle rate.  
The cycle rate for cooling is fixed and can not be adjusted.  
Contact a local service person for suggestions.  
Thermostat Setting and Thermometer  
Disagree  
1. Thermostat thermometer setting requires  
adjustment.  
The thermometer can be adjusted +/- 4 degrees as listed  
in item 7 of the Configuration Menu. No other adjustment  
is possible.  
Clock Loses or Gains Time  
1. Loss of power to thermostat and low batteries.  
The thermostat will maintain its program in memory even  
with no power/no batteries 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).  
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 static discharge occurs use the  
Reset Operation listed above.  
Blank Display and/or Keypad Not  
Responding  
1. Loss of power and dead batteries.  
2. Voltage Spike or Static Discharge.  
Replace batteries and check heat/cool system for  
proper operation. If a voltage spike or static discharge  
occurs use the Reset Operation listed above.