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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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
3
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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.
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.
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.
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
4
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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.
5
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