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
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.
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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