1F83-71
Non-Programmable Electronic
Digital Automatic Changeover Multi-stage Thermostat
INSTALLATION AND
WHITE-RODGERS
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 Digital Multi-stage Thermostat uses
thetechnologyofasolid-statemicrocomputertoprovideprecise
time/temperature control.
• 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
Features:
• Simultaneous heat and cool setpoint storage
• Optional C terminal (dual power option)
• Optional B and O terminals
• Preprogrammed temperature control
PRECAUTIONS
CAUTION
Thisthermostatisintendedforusewitha24-voltsystem;donot
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.
!
To prevent electrical shock and/or equipment damage
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:
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)
• Heat/cool systems with up to two stages heat, two
stages cool
DO NOT USE WITH:
THERMAL DATA
• Millivolt systems
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
• Systems exceeding 30 VAC and 2.5 amps
• 3-wire zoned hydronic heating systems
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
PART NO. 37-6126B
Printed in U.S.A.
Replaces 37-6126A
0004
ST. LOUIS, MISSOURI 63123-5398
NOTE
NOTE
The following wiring diagrams show typical terminal identifica-
tion and wiring. For proper installation, refer to the original
manufacturer’s instructions.
Relay contacts shown are thermostatically operated.
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
Thermostat
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.
Control
Circuit
THERMOSTAT
SYSTEM
W2
C*
R
B
O
Y
Y2
G
W
Heat
Relay
Compressor
Contactor
Stage 2
Energized
in COOL
Stage 1
Hot
24 VAC
120 VAC
Compressor
Contactor
Stage 1
Heat
Relay
Energized
in HEAT
Neutral
TRANSFORMER
Fan
Relay
Stage 2
Figure 3. Typical wiring diagram for single transformer systems
* 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.
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
CUT AND
TAPE OFF!
B
W2
C*
R
Y
Y2
G
O
W
Hot
Heat
Relay
Compressor
Contactor
Stage 2
Energized
in COOL
120 VAC
24 VAC
Stage 1
Hot
Neutral
24 VAC
120 VAC
TRANSFORMER
Compressor
Contactor
Stage 1
Heat
Relay
Neutral
TRANSFORMER
Energized
in HEAT
Fan
Relay
Stage 2
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
* The 24 Volt neutral connection
Thermostat
Control
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.
Circuit
THERMOSTAT
SYSTEM
B
W2
C*
R
Y
Y2
G
O
W
Heat
Relay
Compressor
Contactor
Stage 2
Energized
in COOL
Limit or
Safety
Switches
Stage 1
Limit or
Safety
Switches
Hot
24 VAC
120 VAC
Neutral
Compressor
Contactor
Stage 1
Heat
Relay
Energized
in HEAT
Fan
24 VAC
Accessory
Relay N.O.
Contact
HEATING
TRANSFORMER
Relay
Stage 2
Common
Limit or
Safety
Switches
Limit or
Safety
Switches
Hot
TWO COMMONS MUST
BE JUMPERED TOGETHER!
24 VAC
120 VAC
Common
Neutral
COOLING
TRANSFORMER
Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
3
Heating System
3. Press
toadjusttemperaturesettingaboveroomtempera-
1. Press SYSTEM button to turn thermostat to HEAT.
ture. The cooling system should stop operating.
2. Press
toadjustthermostatsettingto90° andholdforfive
NOTE
seconds. After you release the button, both stages of the
heating system should begin to operate within five seconds.
During normal operation, the second stage of heat or cool may
take 15 to 30 minutes to turn on. The delay varies depending on
theperformanceofthefirststage.Typicallythesecondstagewill
comeonsoonerinmoresevereweather,whileinmilderweather
it will take longer. There is no adjustment to this feature, as it is
designed to maximize both comfort and efficiency.
3. Press
toadjusttemperaturesettingbelowroomtempera-
ture. The auxiliary heating system will stop immediately and
the first stage will stop within three to four minutes.
Cooling System
CAUTION
!
LOCKOUT BYPASS OPTION
Topreventcompressorand/orpropertydamage, ifthe
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY.OPERATORSSHOULDNOTUSETHISFEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
1. Press SYSTEM button to turn thermostat to COOL.
2. Press
toadjustthermostatsettingto45° andholdforfive
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).
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 over-
ride this feature while testing thermostat operation,
Ifthefanisrunningbutthecompressorisnotrunningandthe
word COOL is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to temporarily
override the compressor lockout feature during testing).
simply press
and
buttons at the same time.
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESSTHECOMPRESSOROILHEATERSHAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
4
OPERATION
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.
1
2
THE THERMOSTAT BASE
SYSTEM
FAN ON
AUTO
Other than
and
, the following buttons and switches are
COOL-OFF-HEAT-AUTO
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
3
4
(Red arrow) Raises temperature setting.
(Blue arrow) Lowers temperature setting.
SYSTEM button (COOL, OFF, HEAT, AUTO).
FAN switch (ON, AUTO).
1
2
3
4
5
HT 1+2
OFF
6
8
CL 1+2
LOCK
BATTERY
The Display
5
7
9
HTisdisplayedwhentheSYSTEMbuttonhasbeenpressed
5
Figure 6. Thermostat display, buttons, and switches
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)
whenthecompressorisinlockoutmode. AUTOisdisplayed
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.
unauthorized tampering. To select this feature, press
andSYSTEMbuttonatthesametimeandholduntilLOCK
is displayed. To unlock the thermostat, press
and
SYSTEM buttons at the same time until LOCK is no longer
displayed.
Displays current temperature.
6
7
• °F/°C CONVERTIBILITY — Press
and SYSTEM but-
LOCK is displayed when keypad lockout has been acti-
tons until the temperature display is in Celsius. To display
Fahrenheit, repeat the process.
vated.
Displays current setpoint temperature (this is blank when
SYSTEM button has been pressed to turn the system OFF).
8
9
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostathasbeenaccuratelysetinourfactory.However,
if you wish, you may adjust your new thermostat tempera-
ture display. This can be accomplished (within a ±4°F
range) as follows:
LO BATTERY is displayed when approximately 70% of
battery life has been exhausted.
OPERATING FEATURES
1. Press and hold
and SYSTEM buttons at the same
Now that you are familiar with the thermostat buttons and
display, read the following information to learn about the many
features of the thermostat.
timeuntiltheactualtemperatureonlyisdisplayed(about
5 seconds).
2. Press
or
to adjust the displayed temperature to
• TEMPERATURE SETPOINT — Press
or
until the
your desired setting. (To reset the temperature display
display shows the temperature you want.
back to the actual sensed temperature, press
SYSTEM buttons at the same time again.)
3. Press SYSTEM to resume normal thermostat operation.
and
• 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.
TROUBLESHOOTING
If your thermostat’s display is frozen or displaying incorrectly,
the thermostat may have been affected by static discharge or
voltagevariations. Ifthishappens, presstheRESETbutton(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.
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
For optimum performance, we recommend replacing batteries
once a year with fresh “AA” Energizer® alkaline batteries.
5
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