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1F86-241  
Non-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 Digital Thermostat uses the technol-  
ogy of a solid-state microcomputer to provide precise time/  
temperature control. This thermostat offers you the flexibility to  
design heating and cooling programs that fit your needs.  
• Backlit display  
• LCD continuously displays set point and room temperature  
• °F/°C convertibility  
• Temperature range 45° to 90°F  
Features:  
• RC, RH, C, W, Y, G , O and B terminals  
• 24 Volt System powered  
• Simultaneous heat and cool set point storage  
• Pre-set temperature control  
• B and O terminals for single stage heat pumps (no auxiliary  
heat) or damper operation  
• Set point storage in case of power loss  
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.  
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.  
Do not exceed the specification ratings.  
Allwiringmustconformtolocalandnationalelectricalcodesand  
ordinances.  
This control is a precision instrument, and should be handled  
carefully. Roughhandlingordistortingcomponentscouldcause  
the control to malfunction.  
Thermostat installation and all components of the  
system shall conform to Class II circuits per the NEC  
code.  
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.  
SPECIFICATIONS  
ELECTRICAL DATA  
APPLICATIONS  
Electrical Rating:  
For use with:  
18 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)  
•
•
•
•
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 (no auxiliary heat)  
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:  
-4°F to 150°F  
•
•
DO NOT USE WITH:  
•
•
•
•
Millivolt systems  
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. 37-6165B  
Printed in U.S.A.  
Replaces 37-6165A  
0105  
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INSTALLATION  
REMOVE OLD THERMOSTAT  
Screw anchors  
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  
thermostathasawallmountingplate,removethethermostat  
and the wall mounting plate as an assembly.  
3. Identifyeachwireattachedtotheoldthermostatusingthe  
labels enclosed with the new thermostat.  
4. Disconnect the wires from old thermostat one at a time. DO  
Mounting  
holes  
NOT LET WIRES FALL BACK INTO THE WALL.  
Electric/Gas  
switch  
5. Install new thermostat using the following procedures.  
Mounting  
holes  
ATTENTION!  
Figure 1. Thermostat Base  
This product does not contain mercury. However, this product  
may replace a unit which contains mercury.  
6. Push excess wire into wall and plug hole with a fire-resistant  
material(suchasfiberglassinsulation)topreventdraftsfrom  
affecting thermostat operation.  
Do not open mercury cells. If a cell becomes damaged, do not  
touch any spilled mercury. Wearing nonabsorbent gloves, take  
up the spilled mercury and place into a container which can be  
sealed. If a cell becomes damaged, the unit should be dis-  
carded.  
HYDRONIC (HOT WATER OR STEAM)  
HEATING SYSTEMS  
Mercury must not be discarded in household trash. When the  
unit this product is replacing is to be discarded, place in a  
suitable container and return to White-Rodgers at 9797 Reavis  
Road, St. Louis, MO, 63123-5398 for proper disposal.  
This thermostat is set to operate properly with a forced-air  
heatingsystem.Ifyouhaveahydronicheatingsystem(asystem  
that heats with hot water or steam), you must set the thermostat  
tooperateproperlywithyoursystem. Changethesecondoption  
intheconfigurationmenutoSL(seeCONFIGURATIONMENU,  
page 4).  
ELECTRIC HEAT OR SINGLE-STAGE  
HEAT PUMP SYSTEMS  
Read entire paragraph before setting electric heat switch. If you  
are unsure of your application, contact a qualified service  
person.  
CHECK THERMOSTAT OPERATION  
If at any time during testing your system does not operate  
properly, contact a qualified service person.  
If you have a single-stage heat pump system, OR your system  
uses central electric heat, where the blower is energized by a  
separate circuit through the fan relay (meaning that the fan  
turns on immediately on call for heat), then the switch on the  
thermostat base must be moved to the “ELECTRIC” position  
(see fig 1). If the thermostat is energizing electric heat sequenc-  
ers, the switch MUST remain in the “GAS” position.  
Turn on power to the system.  
Fan Operation  
If your system does not have a G terminal connection, skip to  
Heating System.  
1. Move fan switch to ON position. The blower should begin to  
If you must move the switch to the “ELECTRIC” position (to the  
left), use a small screwdriver or pencil.  
operate.  
2. Move fan switch to AUTO position. The blower should stop  
immediately.  
ATTACH THERMOSTAT BASE TO WALL  
Heating System  
1. Remove the packing material from the thermostat. Gently  
pull the cover straight off the base. Forcing or prying on the  
thermostatwillcausedamagetotheunit. Ifnecessary, move  
the electric heat switch (see ELECTRIC HEAT SYSTEMS,  
above).  
1. Move SYSTEM switch to HEAT position. If the heating  
system has a standing pilot, be sure to light it.  
2. Press  
toadjustthermostatsettingaboveroomtempera-  
ture. The heating system should begin to operate.  
2. Connect wires beneath terminal screws on base using  
appropriate wiring schematic (see figs. 2 through 7).  
3. Press  
to adjust temperature setting below room tem-  
perature. The heating system should stop operating.  
3. Place base over hole in wall and mark mounting hole  
locations on wall using base as a template.  
Cooling System  
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. Place a level against bottom of base,  
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.  
CAUTION  
!
Topreventcompressorand/orpropertydamage, ifthe  
outdoor temperature is below 50°F, DO NOT operate  
the cooling system.  
1. Move SYSTEM switch to COOL position.  
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JUMPER  
WIRE  
THERMOSTAT  
Y
C
B
O
G
W
RC  
RH  
SYSTEM  
THERMOSTAT  
SYSTEM  
C
Y
B
O
G
W
RC  
RH  
Hot  
Cooling  
System Relay System  
Fan  
Heating  
24 VAC  
120 VAC  
Neutral  
Fan  
Relay  
Heating  
System  
HEATING  
TRANSFORMER  
Hot  
24 VAC  
120 VAC  
Neutral  
Hot  
24 VAC  
120 VAC  
Neutral  
TRANSFORMER  
Figure 2. Typical wiring diagram for  
heat only, 3-wire, single transformer systems  
with common connection (required)  
COOLING TRANSFORMER  
Figure 5. Typical wiring diagram for  
heat/cool, 5-wire, two-transformer systems  
with common connection (required)  
JUMPER  
WIRE  
THERMOSTAT  
C
B
O
Y
G
W
RC  
RH  
JUMPER  
WIRE  
SYSTEM  
JUMPER  
WIRE  
THERMOSTAT  
SYSTEM  
Cooling  
System Relay  
Fan  
Y
C
B
O
G
W
RC RH  
Hot  
24 VAC  
120 VAC  
Neutral  
Reversing Compressor Fan  
Valve*  
Contactor Relay  
Hot  
TRANSFORMER  
24 VAC  
120 VAC  
Neutral  
Figure 3. Typical wiring diagram for  
cool only, 3-wire, single transformer systems  
with common connection (required)  
* Reversing valve is energized when the  
system switch is in the COOL position  
TRANSFORMER  
Figure 6. Typical wiring diagram for heat pump  
with reversing valve energized in COOL  
with common connection (required)  
NOTE  
RED jumper wire (provided with thermostat) must be  
connected between thermostat RH and RC terminals  
for proper thermostat operation with this system.  
JUMPER  
WIRE  
JUMPER  
WIRE  
JUMPER  
WIRE  
THERMOSTAT  
SYSTEM  
Y
C
B
O
G
W
RC RH  
THERMOSTAT  
SYSTEM  
Y
C
B
O
G
W
RC RH  
Cooling  
System Relay  
Fan  
Heating  
System  
Reversing Compressor Fan  
Valve*  
Contactor Relay  
Hot  
Hot  
24 VAC  
120 VAC  
Neutral  
24 VAC  
120 VAC  
Neutral  
* Reversing valve is energized when the  
system switch is in the HEAT position  
TRANSFORMER  
TRANSFORMER  
Figure 7. Typical wiring diagram for heat pump  
with reversing valve energized in HEAT  
with common connection (required)  
Figure 4. Typical wiring diagram for  
heat/cool, 4-wire, single transformer systems  
with common connection (required)  
2. Press  
toadjustthermostatsettingbelowroomtempera- 3. Press  
to adjust temperature setting above room tem-  
ture.Theblowershouldcomeonimmediatelyonhighspeed,  
followed by cold air circulation  
perature. The cooling system should stop operating.  
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, pullitstraightoutfromthebase. Toreplacethecover, line  
up the cover with the base and press until the cover snaps onto  
the base.  
1
2
FAN  
SYSTEM  
ON AUTO COOL OFF HEAT  
The Thermostat Buttons and Switches  
1
2
3
4
Raises temperature setting.  
Lowers temperature setting.  
3
4
FAN switch (ON, AUTO).  
°
F
°C  
SYSTEM switch (COOL, OFF, HEAT).  
7
5
6
5
Figure 8. Thermostat display, buttons, and switches  
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4) Select Compressor Lockout (LOC OFF or ON) - Select-  
ing LOC ON will cause the thermostat to wait 5 minutes  
before turning on the compressor if the heating and cooling  
system loses power. It will also wait 5 minutes minimum  
between cooling cycles. This is intended to help protect the  
compressor from short cycling. Some newer compressors  
already have a time delay built in and do not require this  
feature. Your compressor manufacturer can tell you if the  
feature is already present in their system. When the  
compressor time delay occurs it will flash the (snowflake  
icon) for about five minutes then turn on the compressor.  
The Display  
5
Flame icon ( ) is displayed when the SYSTEM switch is in  
the HEAT position. Snowflake icon ( )is displayed (non-  
flashing)whentheSYSTEMswitchisintheCOOLposition.  
Snowflake is displayed (flashing) if the thermostat is in  
lockout mode to prevent the compressor from cycling too  
quickly.  
6
7
Displays current time and temperature.  
Displays set point temperature (this is blank when SYS-  
TEM switch is in the OFF position).  
5) Select Temperature Display Adjustment (4 LO to 4 HI) -  
Allows you to adjust the room temperature display 4° higher  
or lower. Your thermostat was accurately calibrated at the  
factory but you have the option to change the display  
temperature to match your previous thermostat.  
CONFIGURATION MENU  
The configuration menu allows you to set certain thermostat  
operating characteristics to your system or personal require-  
ments.  
6) Select Temperature DIsplay (°F or °C) - Changes the  
display readout to Centigrade or Fahrenheit as required.  
Move SYSTEM switch to the OFF position, then press  
and  
OPERATING FEATURES  
at the same time to enter the configuration menu. The  
display will show the first item in the configuration menu.  
Now that you are familiar with the thermostat buttons and  
display, read the following information to learn about the many  
features of the thermostat.  
The configuration menu chart below summarizes the configura-  
tion options. An explanation of each option follows.  
• SIMULTANEOUS HEATING/COOLING PROGRAM  
STORAGE — You can enter both your heating and cooling  
set points at the same time. There is no need to change the  
thermostat at the beginning of each season.  
Press  
and  
to change to the next menu item. To exit the  
menu and return to the program operation, move the SYSTEM  
switch to HEAT or COOL. If no keys are pressed within fifteen  
minutes, the thermostat will revert to normal operation.  
• CONFIGURATION MENU — Allows you to customize  
certain thermostat options.  
2) Select FA or SL (Fast or Slow) Heating Cycle Rate - The  
FA setting is frequently used for gas, oil or electric heat. The  
SL setting produces a longer heating cycle which is nor-  
mally for hot water or steam (hydronic) systems. Both  
settings produce very accurate temperature control and  
can be set to your personal preference. FA cycles the  
system just under 1°F and the SL setting cycles at approxi-  
mately 1.5°F.  
SETTING THE THERMOSTAT  
This thermostat is very easy to operate. Set the SYSTEM switch  
to either HEAT or COOL then press  
or  
until the  
temperature you want to maintain is shown on the right side of  
the display. If you want to turn the system off, just move the  
SYSTEM switch to OFF.  
3) Select Display Backlight (d-L OFF or ON) - The display  
backlight improves display contrast in low lighting condi-  
tions. Selecting backlight ON will keep the light on continu-  
ously. Selecting OFF will keep the light off.  
The FAN switch controls the fan operation. When the FAN  
switch is set to AUTO, the fan will cycle with the furnace or air  
conditioner. When the FAN switch is set to ON, the fan will run  
continuously, regardles of SYSTEM switch position.  
Configuration Menu  
Step  
Press Button(s)  
Displayed (Factory Default) Press  
or  
to select:  
COMMENTS  
1
Set SYSTEM  
switch to OFF  
SYSTEM switch must be OFF to configure thermostat options  
Select FA or SL (Fast or Slow) heating cycle rate  
Select display backlight OFF or ON  
SL  
2
3
4
5
6
and  
and  
and  
(FA)  
d-L  
(ON)  
OFF  
ON  
LOC  
(OFF)  
Select Compressor lockout OFF or ON  
Select temperature display adjustment higher or lower  
0 HI  
(0)  
4 LO to  
4 HI  
and  
and  
Select temperature display to °F or °C  
(°F)  
°C  
Returns to normal operation  
Set SYSTEM  
switch to HEAT  
or COOL  
7
* Press  
and  
to advance to next item  
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TROUBLESHOOTING  
No Heating  
With the SYSTEM switch set to HEAT, when the setpoint  
temperature is raised or lowered past the room temperature,  
the thermostat will make a soft click sound. Usually, the sound  
indicates the thermostat is operating correctly. If the system  
does not come on, check the system or contact your heating/  
cooling service person. If the thermostat does not click try the  
Reset Operation listed below.  
No Cooling  
Same procedure as heating except set SYSTEM switch to  
COOL. There can be up to a 5 minute compressor lock-out time  
delay before the thermostat clicks in COOL.  
Blank Display  
A blank digital display usually indicates loss of power to the  
thermostat from the heating and cooling system or indicates  
the thermostat has received a voltage spike or static discharge  
(see Reset Operation).  
The thermostat must have 24 volts constantly supplied to  
terminals RC/RH and C. A blown fuse or tripped breaker could  
cause a power loss. Also, many furnaces contain safety or limit  
devices that can disconnect the power to the thermostat  
intermittently.  
Reset Operation  
If a voltage spike or static discharge blanks out the display or  
causes erratic thermostat operation you can reset the thermo-  
stat by pressing  
,
and move the SYSTEM switch from  
OFF to HEAT at the same time. This also resets the factory  
defaultstotheconfigurationmenu. Ifthethermostathaspower,  
has been reset and still does not function correctly contact your  
heating/cooling service person or place of purchase.  
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