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WHITE-RODGERS
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.
Your new White-Rodgers Digital Multi-stage Thermostat uses
the technology of a solid-state microcomputer to provide precise
time/temperature control.
Features:
• Simultaneous heat and cool setpoint storage
• Optional C terminal (dual power option)
• Optional B and O terminals
• Preprogrammed temperature control
This thermostat is intended for use with a 24-volt system; do not
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.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and
ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
1F83-71
Non-Programmable Electronic
Digital Automatic Changeover Multi-stage Thermostat
INSTALLATION AND
OPERATION INSTRUCTIONS
DESCRIPTION
• LCD continuously displays setpoint and room temperature
• °F/°C convertibility
• Temperature range 45° to 90°F
• Two-stage heat/two-stage cool
• Armchair programming capability
PRECAUTIONS
CAUTION
!
To prevent electrical shock and/or equipment damage
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
WARNING
!
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.
ELECTRICAL DATA
Electrical Rating:
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)
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
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
APPLICATIONS
For use with:
• Heat/cool systems with up to two stages heat, two
DO NOT USE WITH:
• Millivolt systems
• Systems exceeding 30 VAC and 2.5 amps
• 3-wire zoned hydronic heating systems
Printed in U.S.A.
SPECIFICATIONS
stages cool
PART NO. 37-6126B
Replaces 37-6126A
0004
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INST ALLATION
Figure 1. Back of thermostat base
W905
CUT FOR
LONGER
CYCLES
GAS ELECTRIC
REMOVE OLD THERMOSTAT
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
thermostat has a wall mounting plate, remove the thermostat
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.
PRE-INSTALLATION SET-UP
1. Remove the packing material from the thermostat.
2. This thermostat is configured from the factory to operate a
heat/cool, fossil fuel (gas, oil, etc.), forced air system with up
to 2 stages of heat and 2 stages of cool. 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 GAS/ELECTRIC switch on the back of the
thermostat (see fig. 1) and switch it to the ELECTRIC
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.
3. One jumper is located on the back of the thermostat, so that
you may customize the thermostat to meet your individual
preference (see fig. 1). In most applications, the factory
jumper settings provide the most comfortable and convenient thermostat operation.
Jumper wire W905 determines how fast the system cycles
on and off, based on temperature change. As shipped from
the factory, the thermostat will maintain a very consistent
room temperature, usually within 1°F of the thermostat
setting. To achieve a slower on and off cycle, providing a
slightly wider temperature span, cut and separate jumper
wire W905.
INSTALLING THE THERMOSTAT
1. Gently remove the cover by pulling it straight off the base.
Forcing or prying on the unit may cause damage to the unit.
2. Remove the battery tab. With the batteries installed, the
Armchair Programming feature allows you to program the
thermostat before installing it on the wall.
3. Pull wires through the hole in the thermostat base and place
the base over the hole in the wall. Mark mounting hole
locations on the wall using the base as a template.
4. Move the base out of the way. Drill mounting holes.
5. Fasten the base loosely to the wall, as shown in fig. 2, using
two mounting screws. Place a level against the bottom of the
base, adjust until level, and then tighten the screws. (Leveling is for appearance only and will not affect thermostat
operation.) If you are using existing mounting holes, or if the
holes drilled are too large and do not allow you to tighten the
base snugly, use plastic screw anchors to secure the base.
Alkaline batteries (3 “AA”–
install “+” ends to the left)
Screw anchors
C
W
W2
O
R
G
Reset
button
Mounting
holes
B
Y
Y2
Figure 2. Thermostat base
6. Check that the system is turned off. Connect the wires
beneath the terminal screws on the base using the appropriate wiring diagram (see figs. 3 through 5).
7. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
CHECK THERMOSTAT OPERATION
NOTE
If at any time during testing, your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
1. Turn on power to the system.
2. Press SYSTEM button until the system is OFF.
3. Move FAN switch to ON. The blower should begin to operate.
4. Move FAN switch to AUTO position. The blower should stop
within a short period of time.
(Instructions continue on page 4.)
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The following wiring diagrams show typical terminal identifica-
C* R
Y2
Compressor
Contactor
Stage 1
Heat
Relay
Stage 1
Heat
Relay
Stage 2
Thermostat
Control
Circuit
Limit or
Safety
Switches
Limit or
Safety
Switches
Limit or
Safety
Switches
Limit or
Safety
Switches
24 VAC 120 VAC
Hot
Common
Common
Neutral
THERMOSTAT
SYSTEM
Y W
W2
Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
Fan
Relay
G
HEATING
TRANSFORMER
Compressor
Contactor
Stage 2
24 VAC 120 VAC
Hot
Neutral
COOLING
TRANSFORMER
TWO COMMONS MUST
BE JUMPERED TOGETHER!
24 VAC
Accessory
Relay N.O.
Contact
* 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.
O
Energized
in COOL
B
Energized
in HEAT
tion and wiring. For proper installation, refer to the original
manufacturer’s instructions.
W2
Heat
Relay
Stage 2
Energized
in HEAT
Energized
in COOL
Y2OB
Y W
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
G
Heat
Relay
Stage 1
Fan
Relay
Figure 3. Typical wiring diagram for single transformer systems
NOTENOTE
Relay contacts shown are thermostatically operated.
* The 24 Volt neutral connection
to terminal C on the thermostat
Thermostat
Control
Circuit
C* R
THERMOSTAT
SYSTEM
Hot
24 VAC 120 VAC
Neutral
TRANSFORMER
Thermostat
Control
Circuit
is not required if you replace
the batteries once a year with
fresh “AA” Energizer
batteries.
* 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.
®
alkaline
CUT AND
TAPE OFF!
Hot
Neutral
TRANSFORMER
Y W
Compressor
24 VAC120 VAC
Compressor
BE JUMPERED TOGETHER!
Contactor
Contactor
Stage 1
TWO COMMONS MUST
Y2
Stage 2
G
Fan
Relay
O
Energized
in COOL
B
Energized
in HEAT
Heat
Relay
Stage 1
W2
Heat
Relay
Stage 2
C* R
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
3
THERMOSTAT
SYSTEM
Hot
24 VAC 120 VAC
Neutral
TRANSFORMER
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Heating System
1. Press SYSTEM button to turn thermostat to HEAT.
2. Press to adjust thermostat setting to 90° and hold for five
seconds. After you release the button, both stages of the
heating system should begin to operate within five seconds.
3. Press to adjust temperature setting below room temperature. The auxiliary heating system will stop immediately and
the first stage will stop within three to four minutes.
Cooling System
CAUTION
!
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Press SYSTEM button to turn thermostat to COOL.
2. Press to adjust thermostat setting to 45° and hold for five
seconds. After you release the button, 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).
If the fan is running but the compressor is not running and the
word COOL is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to temporarily
override the compressor lockout feature during testing).
3. Press
ture. The cooling system should stop operating.
to adjust temperature setting above room tempera-
NOTE
During normal operation, the second stage of heat or cool may
take 15 to 30 minutes to turn on. The delay varies depending on
the performance of the first stage. Typically the second stage will
come on sooner in more severe weather, while in milder weather
it will take longer. There is no adjustment to this feature, as it is
designed to maximize both comfort and efficiency.
LOCKOUT BYPASS OPTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS FEATURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
COMPRESSOR SHORT TERM
CYCLE PROTECTION
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 compressor to
allow head pressure to stabilize. If you want to override this feature while testing thermostat operation,
simply press and buttons at the same time.
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESS THE COMPRESSOR OIL HEATERS HAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
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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 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.
THE THERMOSTAT BASE
Other than and , the following buttons and switches are
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
(Red arrow) Raises temperature setting.
1
(Blue arrow) Lowers temperature setting.
2
SYSTEM button (COOL, OFF, HEAT, AUTO).
3
FAN switch (ON, AUTO).
4
The Display
HT is displayed when the SYSTEM button has been pressed
5
to put the thermostat in the HEAT mode. CL is displayed
when the SYSTEM button has been pressed to put the
thermostat in the COOL mode. CL is displayed (flashing)
when the compressor is in lockout mode. AUTO is displayed
when the SYSTEM button has been pressed to put the
thermostat in the automatic changeover (AUTO) mode. 1+2
indicates the number of stages the thermostat is calling for.
Displays current temperature.
6
LOCK is displayed when keypad lockout has been acti-
7
vated.
Displays current setpoint temperature (this is blank when
8
SYSTEM button has been pressed to turn the system OFF).
LO BATTERY is displayed when approximately 70% of
9
battery life has been exhausted.
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.
• TEMPERATURE SETPOINT — Press or until the
display shows the temperature you want.
• SIMULTANEOUS HEATING/COOLING SETPOINT
STORAGE — You can enter both your heating and cooling
setpoints at the same time.
• AUTOMATIC CHANGEOVER —If you have a heating/
cooling system, you can set the thermostat to automatically
switch from heat to cool as needed to maintain setpoint
temperature. To select this mode, press SYSTEM button
until AUTO is displayed along with HEAT or COOL.
In AUTO mode, pressing and at the same time will
change the displayed setpoint temperature to the setpoint
of the other mode (HEAT or COOL). This allows you to
change both the HEAT and COOL setpoints, if desired.
• TOTAL KEYPAD LOCKOUT — This security feature al-
lows you to lock out the thermostat buttons to prevent
OPERATION
1
AUTO
FAN ONSYSTEM
COOL-OFF-HEAT-AUTO
3 4
5
HT 1+2
6 8
Figure 6. Thermostat display, buttons, and switches
unauthorized tampering. To select this feature, press
and SYSTEM button at the same time and hold until LOCK
is displayed. To unlock the thermostat, press and
SYSTEM buttons at the same time until LOCK is no longer
displayed.
• °F/°C CONVERTIBILITY — Press and SYSTEM but-
tons until the temperature display is in Celsius. To display
Fahrenheit, repeat the process.
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostat has been accurately set in our factory. However,
if you wish, you may adjust your new thermostat temperature display. This can be accomplished (within a ±4°F
range) as follows:
1. Press and hold and SYSTEM buttons at the same
time until the actual temperature only is displayed (about
5 seconds).
2. Press or to adjust the displayed temperature to
your desired setting. (To reset the temperature display
back to the actual sensed temperature, press and
SYSTEM buttons at the same time again.)
3. Press SYSTEM to resume normal thermostat operation.
If your thermostat’s display is frozen or displaying incorrectly,
the thermostat may have been affected by static discharge or
voltage variations. If this happens, press the RESET button (see
fig. 2, page 2 for the location of the button). If pressing the
RESET button does not correct the problem, contact a qualified
service technician.
For optimum performance, we recommend replacing batteries
once a year with fresh “AA” Energizer
5
OFF
CL 1+2
LOCK
5
7
BATTERY
9
TROUBLESHOOTING
®
alkaline batteries.
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