Page 1
1
2
3
WIRE CUTTER/STRIPPER
Base
Back of
Thermostat Body
RC GRH
YOB
W
W904
W905
Mounting
Hole
Mounting
Hole
Figure 1. Thermostat
W904 - clip for Celcius display
W905 - clip for hydronic system
NOTE: Earlier models refer to 37-7006 for jumper locations.
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
Installation Instructions for
CAUTION
!
Heating & Air Conditioning
1E78
Non-Programmable Thermostat
CONTENTS
Preparations .................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat ............................. 1
Mounting and Wiring ...................................... 2
Check Thermostat Operation ......................... 3
Specifications ................................................ 5
Troubleshooting ............................................. 5
YOUR THERMOSTAT REPLACES
Typical System Compatibility Chart 1E78
Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) Yes
Electronic Ignition Heat Only Two Wire Systems (24 volt) Yes
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) Yes
Standard Heat/Cool Systems (24 volt) Yes
Heat/Cool Systems Electric Heat (24 volt) Yes
Heat Only Electric Heat Systems (24 volt) Yes
Cool Only Systems (24 volt) Yes
Heat Pump Systems (No Aux. or Emergency Heat) Yes
Hot Water Zone Heat Only (Two Wire) Systems Yes
Hot Water Zone Heat Only (Three Wire) Systems No
Line Voltage Heating or Baseboard 110/240 Volt Systems No
Millivolt Systems Floor or Wall Furnaces Yes
12 VDC Mobile Home Application Yes
Multistage Systems No
Systems Exceeding 30VAC, 1.5 Amp No
THERMOSTAT DETAILS
PREPARATIONS
Assemble tools required as shown below.
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage
REMOVING OLD THERMOSTAT
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 wire with the terminal designation it was removed from.
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.
c. The switching subbase, which is removed by unscrewing the
mounting screws that hold it on the wall or adaptor plate.
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, remove wall plate from the wall. If the old thermostat
has a wall mounting plate, remove the thermostat and the wall
mounting plate as an assembly.
4. Identify each wire attached to the old thermostat using the
labels enclosed with the new 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.
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PART NO. 37-6599B
Replaces 37-6599A
1026
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REMOVING OLD THERMOSTAT
WARNING
!
CAUTION
!
TERMINAL CROSS REFERENCE CHART
New Thermostat
Terminal Designation
Other Manufacturers’
Terminal Designation
RH
RC
G
W
Y
4
R
G
W
Y
RH
R
G
W
Y
M
V
F
H
C
R5
-
G
4
Y6
R
-
G
W
Y
**
* These are four-wire, single-transformer systems.
Factory installed jumper wire between the RH
and RC terminals must remain in place.
CONTINUED FROM FIRST PAGE
ATTENTION! This product does not contain mercury. However,
this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not touch
any spilled mercury. Wearing non-absorbent gloves, take up the
spilled mercury and place into a container which can be sealed. If a
cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit
this product is replacing is to be discarded, place in a suitable container. Refer to www.white-rodgers.com for location to send product
containing mercury.
MOUNTING AND WIRING
Do not use on circuits exceeding specified voltage. Higher
voltage will damage control and could cause shock or fire
hazard.
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.
Thermostat installation and all components of the system
shall conform to Class II circuits per the NEC code.
Electric Heat or Single-Stage
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 or heat-pump
system that REQUIRES the thermostat to turn on the fan on a call
for heat, locate the ELEC/GAS switch (see fig. 1) and switch it to
the ELEC position. This will allow the thermostat to energize 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.
This thermostat is set to operate properly with a forced-air heating
system. If you have a hydronic heating system (a system that heats
with hot water or steam), you must set the thermostat to operate
properly with your system.
The factory default setting is forced air heat. Clipping jumper W905 on
the circuit board will produce a longer heating cycle which is normally
for hot water or steam (hydronic) systems. Both settings produce a
very accurate temperature control and can be set to your personal
preference. As received, the thermostat cycles the system just under
1˚F. With W905 clipped, the system cycles at approximately 1.5˚F.
Heat Pump Systems
Hydronic (Hot Water or Steam)
Heating Systems
Take care when securing and routing wires so they do not
short to adjacent terminals or rear of thermostat. Personal
injury and/or property damage may occur.
Attach Thermostat Base to Wall
1. Remove the packing material from the thermostat. Gently pull the
body straight off the base. Forcing or prying on the thermostat
will cause damage to the unit. If necessary, move the electric
heat switch (see ELECTRIC HEAT SYSTEMS, above).
2. Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 7).
3. Place base over hole in wall and mark mounting hole locations
on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two mounting screws. 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.
6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate.
If
should be replaced with fresh “AAA” Energizer® alkaline batteries.
The batteries are located on the back of the thermostat body (see
fig. 1).
appears on the display, the batteries are low and
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4
MOUNTING AND WIRING
RH
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 2. Typical wiring diagram for
heat only, 3-wire, single transformer systems
TRANSFORMER
Heating
System
Fan
Relay
Y
RC
JUMPER
WIRE
OB
For 2-wire Heat only,
attach to RH and W
NOTE
RH
Y
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
THERMOSTAT
SYSTEM
G W
Figure 3. Typical wiring diagram for
cool only, 3-wire, single transformer systems
Cooling
System
Fan
Relay
RCOB
JUMPER
WIRE
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 4. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
TRANSFORMER
Heating
System
Fan
Relay
Cooling
System
RC
JUMPER
WIRE
OB
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
NOTE
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
HEATING
TRANSFORMER
Heating
System
Fan
Relay
Cooling
System
RC
24 VAC
120 VAC
Hot
Neutral
COOLING TRANSFORMER
OB
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
TRANSFORMER
Reversing
Valve*
RCOB
JUMPER
WIRE
Compressor
Contactor
JUMPER
WIRE
* Reversing valve is energized when the
system switch is in the COOL position
Fan
Relay
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
TRANSFORMER
Reversing
Valve*
RCOB
JUMPER
WIRE
Compressor
Contactor
JUMPER
WIRE
* Reversing valve is energized when the
system switch is in the HEAT position
Fan
Relay
CAUTION
!
CONTINUED FROM SECOND PAGE
CHECK THERMOSTAT OPERATION
NOTE
To prevent static discharge problems, touch side of thermostat
to release static build-up before touching any keys.
If at any time during testing your system does not operate properly,
contact a qualified service person.
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 im-
mediately.
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate the
cooling system.
Cooling System
This thermostat has a time delay between cooling cycles to allow the
head pressure in the compressor to stabilize. If the temperature 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.
1. Move SYSTEM switch to COOL position.
2. Press
The blower should come on immediately on high speed, followed
by cold air circulation
3. Press
The cooling system should stop operating.
1. Move SYSTEM switch to HEAT position. If the heating system
has a standing pilot, be sure to light it.
2. Press
The heating system should begin to operate.
3. Press
The heating system should stop operating.
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to adjust thermostat setting below room temperature.
to adjust temperature setting above room temperature.
Heating System
to adjust thermostat setting above room temperature.
to adjust temperature setting below room temperature.
Page 4
1
2
3
4
5
6
7
8
Figure 8. Thermostat display, buttons and switches
5
CHECK THERMOSTAT OPERATION
CONTINUED FROM THIRD PAGE
Before you begin using 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 body and the base. To remove the body, gently pull it
straight out from the base. To replace the body, line up the body with
the base and press gently until the body snaps onto the base.
The Thermostat Buttons and Switches
(Up arrow) Raises temperature setting.
(Down arrow) Lowers temperature setting.
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
The Display
is displayed when the SYSTEM switch is in the HEAT posi-
tion.
is in the COOL position.
compressor is in lockout mode.
Displays current temperature.
is displayed when the 2 “AAA” batteries are low
and should be replaced. Nothing else will be displayed. Earlier
models display “LO BATTERY”. Refer to 37-7006.
Displays currently set temperature (this is blank when
SYSTEM switch is in the OFF position).
is displayed (non-flashing) when the SYSTEM switch
is displayed (flashing) when the
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 SETPOINT STORAGE
— You can enter both your heating and cooling setpoints at the
same time. There is no need to re-enter the thermostat at the
beginning of each season.
• TEMPERATURE SETTING — Press
display shows the temperature you want. The thermostat will
keep the room temperature at the selected temperature.
• °F/°C CONVERTIBILITY — The factory default setting is Fahr-
enheit. Clipping W904 jumper on the circuit board (see fig. 1)
will alter this feature to Celsius temperature setting.
• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline batteries
are low and should be replaced, the display will be blank except
for . 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 except for
has been displayed for 4 weeks, the thermostat
will raise the temperature 10° above your setpoint in COOL
mode and drop the temperature 10° below your setpoint in
HEAT mode. You cannot program with low batteries, but you
can override setpoint temperature.
or until the
. After
• TEMPERATURE DISPLAY ADJUSTMENT — Your new ther-
mostat has been accurately set in our factory. However, if you
wish, you may adjust your new thermostat temperature display
to match your old thermostat. This can be accomplished (within
a ±3° range) as follows:
1. Press
the SYSTEM switch in OFF position.
2. Press
your desired setting.
3. Move SYSTEM switch from OFF to exit the feature.
• DISPLAY BACKLIGHT— The display backlight improves dis-
play contrast in low lighting conditions. Selecting backlight ON
will turn the light on for a short period of time after any button
is pressed. Selecting backlight OFF (default) will keep the light
off. Turn the display backlight feature ON as follows:
1. Press
with the SYSTEM switch in HEAT position. The display will
alternately show “-L” AND “FF” (off).
2. Press
3. Move SYSTEM switch to OFF to exit the feature.
and at the same time for two seconds with
or to adjust the displayed temperature to
and at the same time for two seconds
or to change “FF” to “ON”.
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SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
0 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)
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or causes
erratic thermostat operation you can reset the thermostat by pressing
and at the same time while moving the SYSTEM switch from
OFF to HEAT. This also resets the factory defaults. If the thermostat
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
has power, has been reset and still does not function correctly contact
your heating/cooling service person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries once
a year with fresh “AAA” Energizer
®
alkaline batteries.
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan
(common problems)
No Heat
No Cool
Blown fuse or tripped circuit breaker. 1.
Furnace power switch to OFF.2.
Furnace blower compartment door or panel 3.
loose or not properly installed.
Pilot light not lit. 1.
SYSTEM Switch not set to 2. HEAT.
Loose connection to thermostat or system. 3.
Furnace Lock-Out Condition. Heat may also be 4.
intermittent.
5. Heating system requires service or thermostat
requires replacement.
SYSTEM Switch not set to COOL. 1.
Loose connection to thermostat or system. 2.
Cooling system requires service or thermostat 3.
requires replacement.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.
Re-light pilot.
Set SYSTEM Switch to HEAT and raise setpoint
temperature above room temperature.
Verify thermostat and system wires are securely
attached.
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.
Diagnostic: 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 is operating
correctly.
Set SYSTEM Switch to COOL and lower setpoint
temperature below room temperature.
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.
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TROUBLESHOOTING
CONTINUED FROM FIFTH PAGE
Symptom Possible Cause Corrective Action
Heat, Cool or Fan Runs Constantly.
Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Thermostat Setting and Thermostat
Thermometer Disagree
Blank Display and/or Keypad
Not Responding
Possible short in wiring.1.
Possible short in thermostat.2.
Possible short in heat/cool/fan system.3.
FAN Switch set to Fan ON.4.
The location of the thermostat and/or the size of 1.
the Heating System may be
influencing the cycle rate.
The location of the thermostat and the size of 1.
the Cooling System can influence the cycle rate.
Thermostat thermometer setting requires adjust-1.
ment.
Voltage spike or static discharge.1.
Battery change required.2.
C h e c k e a c h w i r e c o n n e c t i o n t o v e r i f y t h e y a r e n o t
shorted or touching together. No bare wire should
stick out from under terminal screws. Try resetting
the thermostat as described above. 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.
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, clip Jumper W-905 as mentioned in the
instructions for Hydronic Heating Systems. It is not
possible to shorten the cycle time. If an acceptable cycle rate is not achieved as received or by
clipping W-905 contact a local service person for
additional suggestions.
The cycle rate for cooling is fixed and can not be
adjusted. Contact a local service person for suggestions.
The thermometer can be adjusted +/- 3 degrees.
See Temperature Display Adjustment in the
Operation section.
Replace batteries and check heat/cool system
for proper operation. If a voltage spike occurs use
the Reset Operation listed above.
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Page 7
NOTES
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Page 8
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
Homeowner Help Line: 1-800-284-2925
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