White Rodgers Thermometer 7904 User Manual

Model No. 7904  
Programmable Electronic Digital Thermostat  
WHITE-RODGERS  
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 5-Day/2-Day Digital Thermostat uses  
thetechnologyofasolid-statemicrocomputertoprovideprecise  
time/temperature control. This thermostat offers you the flexibil-  
ity to design heating and cooling programs that fit your needs.  
• LCD continuously displays set point, and alternately dis-  
plays time and room temperature  
• Temperature override until next program period  
• Manual program override (HOLD temperature)  
• User may select either 12- or 24-hour clock display  
°F/°C convertibility  
Features:  
• Battery powered (3 “AA” Energizer® alkaline batteries  
included).  
• Temperature range 45° to 90°F  
• Separate 5-day (weekday) and 2-day (weekend) programming  
• Simultaneous heat and cool program storage  
• Preprogrammed temperature control  
• Standard five terminals for single or two-transformer sys-  
tems  
• B and O terminals for single stage heat pumps or damper  
operation  
• Four separate time/temperature settings per 24-hour pe-  
riod  
PRECAUTIONS  
Thisthermostatisintendedforusewithalowvoltagesystem;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.  
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.  
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:  
8 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)  
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  
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:  
-40°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 DIVISION  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
ST. LOUIS, MISSOURI 63123-5398  
PART NO. 37-5599B  
Printed in U.S.A.  
Replaces 37-5599A  
9731  
 
JUMPER  
WIRE  
THERMOSTAT  
SYSTEM  
Y
B
O
G
W
RC RH  
THERMOSTAT  
SYSTEM  
Y
B
O
G
W
RC  
RH  
NOTE  
Cooling  
System  
Fan  
Relay  
Heating  
System  
RED jumper wire (provided  
with thermostat) must be  
connected between thermo-  
stat's RH and RC terminals  
for proper thermostat oper-  
ation with this system.  
Heating  
System  
Hot  
24 VAC Transformer  
24 VAC  
120 VAC  
Neutral  
or  
Thermopile  
TRANSFORMER  
Figure 3. Typical wiring diagram for heating only,  
2-wire, single transformer systems or millivolt systems  
Figure 7. Typical wiring diagram for  
heat/cool, 4-wire, single transformer systems  
THERMOSTAT  
Thermostat  
NOTE  
Y
B
O
G
W
RC  
RH  
3-wire Series 10  
Primary Control  
(located at furnace)  
Jumper wire must be  
added between R and B  
terminals on the primary  
control (jumper wire not  
provided with thermostat).  
SYSTEM  
Hot  
Cooling  
System Relay System  
Fan  
Heating  
R
W
24 VAC  
120 VAC  
B
Neutral  
HEATING TRANSFORMER  
Hot  
W
R
24 VAC  
120 VAC  
Furnace  
Add jumper wire  
(not provided with thermostat)  
Neutral  
COOLING TRANSFORMER  
Figure 8. Typical wiring diagram for  
heat/cool, 5-wire, two-transformer systems  
Figure 4. Typical wiring diagram for  
3-wire SERIES 10 heating systems  
JUMPER  
WIRE  
JUMPER  
WIRE  
JUMPER  
WIRE  
THERMOSTAT  
Y
B
O
G
W
RC  
RH  
THERMOSTAT  
SYSTEM  
SYSTEM  
Y
B
O
G
W
RC RH  
NOTE  
Fan  
Relay  
Heating  
System  
RED jumper wire (provided  
with thermostat) must be  
connected between thermo-  
stat's RH and RC terminals  
for proper thermostat oper-  
ation with this system.  
Reversing Compressor Fan  
Valve*  
Contactor Relay  
Hot  
Hot  
24 VAC  
120 VAC  
24 VAC  
120 VAC  
Neutral  
Neutral  
TRANSFORMER  
* Reversing valve is energized when the  
system switch is in the COOL position  
TRANSFORMER  
Figure 9. Typical wiring diagram for  
heat pump with cool active reversing valve  
Figure 5. Typical wiring diagram for  
heat only, 3-wire, single transformer systems  
JUMPER  
WIRE  
JUMPER  
WIRE  
THERMOSTAT  
SYSTEM  
THERMOSTAT  
SYSTEM  
Y
B
O
G
W
RC  
RH  
Y
B
O
G
W
RC RH  
Cooling  
System  
Fan  
Relay  
Reversing Compressor Fan  
Valve*  
Contactor Relay  
Hot  
Hot  
24 VAC  
24 VAC  
120 VAC  
120 VAC  
Neutral  
* Reversing valve is energized when the  
system switch is in the HEAT position  
Neutral  
TRANSFORMER  
Figure 6. Typical wiring diagram for  
cool only, 3-wire, single transformer systems  
Figure 10. Typical wiring diagram for  
heat pump with heat active reversing valve  
3
 
Cooling System  
CHECK THERMOSTAT OPERATION  
If at any time during testing your system does not operate  
properly, contact a qualified serviceperson.  
CAUTION  
!
This thermostat has a built-in short term (5-minute)  
time delay. This feature is activated after the compres-  
sor shuts down and the operator changes the setpoint  
within the 5-minute time period. During this 5-minute  
period, the word COOL will flash, indicating that the  
thermostat has locked out the compressor to allow  
head pressure to stabilize. This thermostat does not  
sense AC power loss, and therefore does not activate  
the short term compressor protection feature when  
power is restored.  
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  
immediately.  
Topreventcompressorand/orpropertydamage, ifthe  
outdoor temperature is below 50°F, DO NOT operate  
the cooling system.  
Heating System  
1. Move SYSTEM switch to HEAT position. If the heating  
1. Move SYSTEM switch to COOL position.  
system has a standing pilot, be sure to light it.  
2. Press  
to adjust thermostat setting below room tempera-  
2. Press  
to adjust thermostat setting above room tempera-  
ture.Theblowershouldcomeonimmediatelyonhighspeed,  
followed by cold air circulation  
ture. The heating system should begin to operate.  
3. Press  
toadjusttemperaturesettingbelowroomtempera-  
3. Press  
to adjust temperature setting above room tem-  
ture. The heating system should stop operating.  
perature. The cooling system should stop operating.  
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
WHITE-RODGERS  
THE THERMOSTAT BASE  
SET TIME VIEW PRGM RUN PRGM HOLD TEMP  
FAN ON  
AUTO  
COOL OFF HEAT  
Other than  
and  
, the following buttons and switches are  
located behind the door on the bottom of the thermostat cover  
(see fig.11). 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  
11  
COOL  
BATTERY  
HOLD  
VIEW PRGM (program) button.  
RUN PRGM (program) button.  
HOLD TEMPerature button.  
12  
13  
11 14 10  
Figure 11. Thermostat display, buttons, and switches  
FAN switch (ON, AUTO).  
HEATisdisplayedwhentheSYSTEMswitchisintheHEAT  
10  
position. COOL is displayed (non-flashing) when the SYS-  
TEM switch is in the COOL position. COOL is displayed  
(flashing) when the compressor is in lockout mode.  
SYSTEM switch (COOL, OFF, HEAT).  
The Display  
Alternately displays current time and temperature.  
11  
12  
Indicates day of the week.  
9
BATTERY is displayed when the 3 “AA” batteries are low  
and should be replaced. Nothing else will be displayed.  
4
 
LOW BATTERY INDICATOR — If the 3 “AA” alkaline  
batteries are low and should be replaced, the display will be  
blank except for the word BATTERY. When the batteries are  
low, pressing any button will cause the display to operate for  
ten seconds. After ten seconds, the display will be blank  
exceptforthewordBATTERY. Youcannotprogramwithlow  
batteries, but you can override setpoint temperature.  
Displays currently programmed set temperature (this is  
blank when SYSTEM switch is in the OFF position).  
13  
14  
The word HOLD is displayed when the thermostat is in the  
HOLD mode.  
OPERATING FEATURES  
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 range) as follows:  
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  
STORAGEWhenprogramming,youcanenterbothyour  
heating and cooling programs at the same time. There is no  
need to reprogram the thermostat at the beginning of each  
season.  
1. Press VIEW PRGM and HOLD TEMP buttons at the  
same time.  
2. Press  
or  
to adjust the displayed temperature to  
your desired setting.  
3. PressRUNPRGMtoresumenormalprogramoperation.  
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.  
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  
PROGRAMMING YOUR THERMOSTAT  
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.  
desired hold temperature by pressing  
or  
. The  
• During early morning hours, the need for cooling is usually  
minimal.  
thermostat will hold the room temperature at the selected  
setting until you press RUN PRGM button to start program  
operation again.  
Look at the factory preprogrammed times and temperatures  
shown below. If this program will suit your needs, simply press the  
RUN PRGM button to begin running the factory preset program.  
°F/°C CONVERTIBILITY — Press and hold SET TIME and  
HOLD TEMP buttons until the temperature display is in  
Celsius (°C). To display Fahrenheit (°F), repeat the pro-  
cess.  
FACTORY PREPROGRAMMING  
Cooling Program for  
ALL Days of the Week:  
Heating Program for  
ALL days of the Week:  
TEMP  
PERIOD  
TIME  
TEMP  
PERIOD  
1st  
2nd  
3rd  
4th  
TIME  
68°F  
68°F  
68°F  
64°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  
82°F  
78°F  
78°F  
12-HOUR/24-HOUR CLOCK DISPLAY — The clock is set  
to display 12-hour time, which means that the clock will  
display AM and PM time (12:00 AM is midnight; 12:00 PM is  
noon). However, you may want to display a 24-hour clock  
(military-style time). The 24-hour clock display will show 1:00  
PM as 13:00, 2:00 PM as 14:00, and so on. To change to the  
24-hour clock display, press and hold SET TIME and RUN  
PRGM buttons at the same time. In the 24-hour clock mode,  
AM and PM are not displayed.  
If you want to change the preprogrammed times and tempera-  
tures, follow these steps.  
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-  
gram. However, you may use the same heating and cooling  
SAMPLE  
Heating/Cooling Schedule Plan  
Heating/Cooling Schedule Plan  
WEEKEND (2 DAY)  
WEEKDAY (5 DAY)  
WEEKEND (2 DAY)  
WEEKDAY (5 DAY)  
Start  
Start  
Start  
Start  
Period  
Time*  
Temperature  
Time*  
Temperature  
Period  
Time*  
Temperature  
Time*  
Temperature  
1ST HEAT  
1ST HEAT  
5:30 AM  
68°F  
7:00 AM  
68°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  
11:00 AM  
6:00 PM  
11:30 PM  
7:00 AM  
12:30 PM  
6:00 PM  
11:30 PM  
70°F  
70°F  
65°F  
76°F  
74°F  
72°F  
78°F  
* We suggest that you program the thermostat so that the heating/cooling system  
has about 30 minutes to reach the desired temperature (for example, if the first  
person gets up at 6:00 AM, program the first period to begin at 5:30 AM).  
5
 
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  
andtemperature). Usethetableatthebottomofthepagetoplan  
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. Press  
or  
tochangethedisplayedtemperaturetoyour  
selected temperature for the 1st heating program period.  
5. Press SET TIME once (the programmed time will flash).  
Press  
or  
until your selected time appears. The time  
will change in 15 minute increments. When your selected  
time is displayed, press SET TIME again to return to the  
change temperature mode.  
6. Press VIEW PRGM once. The currently programmed start  
time and setpoint temperature for the 2nd heating program  
period will appear.  
7. Repeat steps 4 and 5 to select the start time and heating  
temperature for the 2nd heating program period.  
Entering Your Program  
Follow these steps to enter the heating and cooling programs  
you have selected.  
8. Repeatsteps4through6forthe3rdand4thheatingprogram  
periods. Weekday heating programs are now complete.  
NOTE  
9. Press VIEW 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.  
The thermostat should be programmed in the 12-hour format,  
then switched to the 24-hour format, if desired (see OPERAT-  
ING FEATURES for more information).  
10.Repeat steps 4 through 8 to complete weekend heating  
programming.  
Set Current Time and Day  
11.When you have completed entering your heating program,  
press RUN PRGM.  
1. Press SET TIME button once. The display will show the hour  
only.  
Enter Cooling Program  
EXAMPLE:  
PM  
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.  
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 SET TIME once. The display window will show the  
minutes only.  
1. Move SYSTEM switch to COOL position.  
2. Follow the procedure for entering your heating program,  
using your selected cooling times and temperatures.  
EXAMPLE:  
CHECK YOUR PROGRAMMING  
4. Press and hold either  
minutes.  
or  
until you reach the correct  
Follow these steps to check your thermostat programming one  
final time before beginning thermostat operation.  
5. Press SET TIME once. The display will show the day of the  
week.  
1. Move SYSTEM switch to HEAT position.  
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).  
6. Press  
or  
until you reach the current day of the week.  
7. Press RUN PRGM once. The display will show the correct  
time and room temperature alternately.  
Enter Heating Program  
3. Press RUN PRGM.  
1. If you want to change the display from Fahrenheit to Celsius  
(or vice-versa), press SET TIME and HOLD TEMP at the  
same time.  
4. Move SYSTEM switch to COOL position.  
5. Repeat step 2 to check cooling temperatures.  
6. Press RUN PRGM to begin program operation.  
2. Move the SYSTEM switch to HEAT.  
3. Press VIEW PRGM once. “MO TU WE TH FR” (indicating  
weekdayprogram)willappearinthedisplay. Alsodisplayed  
are the currently programmed start time for the 1st heating  
period and the currently programmed temperature (flash-  
ing).  
YOUR THERMOSTAT IS NOW COMPLETELY PRO-  
GRAMMED AND READY TO AUTOMATICALLY PROVIDE  
MAXIMUM COMFORT AND EFFICIENCY!  
MO TU WE TH FR  
AM  
EXAMPLE:  
This display window shows that for the 1st weekday period,  
the start time is 6:00 AM, and 68° is the programmed  
temperature(thisexamplereflectsfactorypreprogramming).  
 

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