White Rodgers Heat Pump 37 6186B User Manual

WHITE-RODGERS  
COMFORT-SET 90® SERIES  
HEAT PUMP INSTALLATION/CONFIGURATION  
INSTALLATION  
DESCRIPTION  
This White-Rodgers Automatic Setback  
Digital Thermostat uses microcomputer  
technology to provide precise time and  
temperature control. This thermostat offers  
the flexibility to design heating and cooling  
programs that fit building needs. This  
thermostat is adaptable to most 24 volt  
residential forced air heat pump systems with  
electric or fossil fuel auxiliary.  
SPECIFICATIONS  
1F94-371: 7 Day programming; residen-  
Standard Systems:  
Single-stage or two-stage compressor  
heat pump.  
Operating Ambient Temperature:  
32° to 110°F (0° to 43°C)  
Operating Humidity Range:  
90% non-condensing max.  
tial applications  
ELECTRICAL DATA  
THERMAL DATA  
Electrical Rating:  
Shipping Temperature Range:  
-4° to 149°F (-20° to 65°C)  
Setpoint Temperature Range:  
45° to 99°F (7° to 37°C)  
20 to 30 VAC, 50/60 Hz with common  
0.05 to 1.5 Amps per terminal  
2.5 Amps maximum total load (all  
terminals combined)  
PRECAUTIONS  
This thermostat is intended for use with a  
low voltage system. Do not use on a line  
voltage system.  
WARNING  
!
CAUTION  
!
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.  
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 ratings shown in the Specifi-  
cations section, above. If in doubt about the  
electrical ratings of your heating/cooling  
system, have it inspected by a qualified  
heating and air conditioning contractor or  
licensed electrician.  
Do not use on circuits exceeding  
specified voltage. Higher voltage will  
damage thermostat and could cause  
shock or fire hazard.  
NOTE  
Read all instructions thoroughly before  
beginning installation.  
All wiring must conform to local and  
national electrical codes and ordinances.  
Thermostat installation and all compo-  
nents of the system shall conform to  
Class II circuits per the NEC code.  
This control is a precision instrument, and  
should be handled carefully. Rough handling  
or distorting components could cause the  
control to malfunction.  
Part No. 37-6186B  
Replaces 37-6186A  
0121  
 
HEAT PUMP TERMINAL OUTPUTS  
Use the terminal output information below to  
help you wire the thermostat properly for  
your heat pump system type. After wiring,  
see CONFIGURATION section for proper  
thermostat configuration.  
Refer to equipment manufacturers’ instruc-  
tions for specific system wiring information.  
This thermostat is designed to operate a  
single-transformer system. If you have a two-  
transformer system, cut and tape off one  
transformer. If transformer safety circuits  
are in only one of the systems, remove the  
transformer of the system with NO safety  
circuits. If required, replace remaining  
transformer with a 75VA Class II transformer.  
After disconnecting one transformer, the two  
commons must be jumpered together.  
You can configure the thermostat for use  
with the following heat pump system types:  
HEAT PUMP TYPE 1. Single-stage  
compressor system; gas or electric backup.  
HEAT PUMP TYPE 2. Multi-stage or two-  
compressor system; gas or electric backup.  
HEAT PUMP TYPE 3. System requiring  
separate signals for heat (W1, W2, W3) and  
cool (Y1); gas or electric backup.  
THERMOSTAT TERMINALS (Upper)  
L
PH  
D
SA  
SB  
SC  
OT  
Malfunction Light X-10 Module Input Not Used Remote Sense A Remote Sense B Remote Sense C  
Outdoor Sensor  
THERMOSTAT TERMINALS (Lower)  
SYSTEM  
E
C
R
W3/A1  
W2  
E2/P  
W1  
Y2  
Y1  
B
O
G
Single-stage compressor system; gas or electric backup  
E2 - Emergency  
mode constant  
output.  
P - All other modes  
constant output.  
Heat mode 3rd  
stage.  
Emergency mode  
2nd stage.  
Heat and cool Energized in  
Emergency  
mode first  
stage  
Blower/Fan Energized  
on call for Heat and  
Cool  
24 Volt  
(Common)  
24 Volt Emergency mode  
(Hot) 3rd stage  
Heat mode  
2nd stage  
modes 1st  
stage  
Heat, Off,  
Emergency  
Mode  
Energized in  
Cool Mode  
Heat Pump 1*  
No Output  
(compressor)  
Multi-stage or two compressor system; gas or electric backup  
E2 - Emergency  
mode constant  
output.  
P - All other modes  
constant output.  
Heat and cool Heat and cool Energized in  
Emergency  
mode first  
stage  
Blower/Fan Energized  
on call for Heat and  
Cool  
24 Volt  
(Common)  
24 Volt Emergency mode Emergency mode  
(Hot) 3rd stage 2nd stage.  
Heat mode  
3rd stage  
modes 2nd  
stage  
modes 1st  
stage  
Heat, Off,  
Emergency  
Mode  
Energized in  
Cool Mode  
Heat Pump 2*  
(compressor 2) (compressor 1)  
System requiring separate signals for heat (W1, W2) and cool (Y1); gas or electric backup  
E2 - Emergency  
Heat mode 3rd  
stage.  
Heat mode 2nd  
stage.  
Energized in  
Emergency  
mode first  
stage  
mode constant  
output.  
Blower/Fan Energized  
on call for Heat and  
Cool  
24 Volt  
(Common)  
24 Volt  
(Hot)  
Heat mode  
1st stage  
Cool mode 1st Heat, Off,  
Energized in  
Cool Mode  
Heat Pump 3**  
No Output  
Emergency mode Emergency mode  
stage  
Emergency  
Mode  
P - All other modes  
constant output.  
3rd stage  
2nd stage  
* If system does not provide connection to E, jumper W1 to E to provide Aux heating in emergency mode.  
** If system does not provide connection to E, jumper W2 to E to provide Aux heating in emergency mode.  
3
 
CONFIGURATION  
SWITCHES  
RESET SWITCH  
See the Troubleshooting section at the end  
of this document for more information about  
the function of this switch.  
E2/P SWITCH  
1
2
The E2/P switch is located on the back of the  
thermostat body (see fig. 2). This switch  
controls how the E2/P terminal of the  
thermostat will be energized. When the  
switch is in the E2 position (down), the E2/P  
terminal will be energized only when in  
emergency heat. When the switch is in the P  
position (up), the E2/P terminal will always  
be energized except when in emergency heat.  
Consult the equipment manufacturer or a  
qualified heating/cooling service person  
before setting this switch. If your system has  
no connection to E2/P, no change in the  
switch setting is required.  
S18  
S19  
P
E2  
Reset switch  
1
2 E2/P switch  
Figure 2. Switch locations on back of thermostat body  
INSTALLER CONFIGURATION  
BEFORE TURNING POWER ON, please  
read the following instructions. Before  
operating the system, you must configure  
the thermostat to operate properly with  
your equipment.  
or a qualified heating and air conditioning  
service person. If your system controls fan  
operation (as with most fossil fuel systems),  
set this item to OFF. Note that with heat  
pump systems, the fan always cycles with the  
compressor.  
TIME  
buttons. Then press and hold SET  
and  
DAY  
SET  
for approximately 3 seconds to  
enter the Installer menu. The display will  
change to show the first item on the Installer  
menu (multi-stage/heat pump selection). Use  
the following text, along with the Installer  
table on page 5, to guide you through the  
menu.  
The thermostat, as it comes from the factory,  
is configured to operate a standard single  
stage heat pump system. In this configura-  
tion, the thermostat will turn on the fan  
immediately on a call for heat. If you are  
unsure whether your system requires the  
thermostat to control the fan, contact your  
furnace/air conditioning system manufacturer  
or a qualified heating/air conditioning  
service person.  
SET CYCLE HEAT, COOL, AUX  
(ANTICIPATION).  
Once in the menu, you set each item to the  
(Installer table steps 3 through 5). These  
items allow the cycle times in heating,  
cooling and auxiliary to be increased or  
decreased. The factory set values can be  
adjusted higher for longer cycles or lower for  
shorter cycles.  
proper selection using  
or  
, then  
FWD  
momentarily press TIME  
to change  
BACK  
the display to the next step or TIME  
to return to the previous item.  
To exit the menu at any time and return to  
NOTE: Some manufacturers still instruct you  
to set the anticipator to the current draw of  
the equipment. That instruction applies only  
to mercury bulb or mechanical thermostats; it  
does not apply to this digital thermostat. As  
configured at the factory, this thermostat will  
maintain an accurate temperature. No  
further adjustment is necessary, although  
you can use these menu items to customize  
the performance of the thermostat to your  
requirements.  
Your new thermostat has an Installer menu,  
which allows you to customize the thermostat  
to meet your requirements. (The thermostat  
also has a User menu and a Keypad  
Lockout menu. These menus are explained  
further in the Operating Instructions.)  
RUN  
program operation, press PROGRAM  
.
HEAT PUMP COMPRESSOR  
CONFIGURATION.  
(Installer table step 1) Use this item to select  
the number of heat pump compressors and  
how they are connected.  
The menu settings can be changed at any time  
to meet system or personal requirements.  
ELECTRIC HEAT FAN  
CONFIGURATION.  
ENTERING THE CONFIGURATION  
MENUS.  
(Installer table step 2.) This menu item  
The adjustment range for HEATING is from  
9 to 40 for heat pump. The factory preset is  
13. The adjustment range for COOLING is  
from 9 to 40. The factory preset is 13. The  
heating and cooling settings will not go  
below 9 because compressors require a  
longer cycle. The adjustment range for  
AUXILIARY is from 1 to 40. The factory  
preset is 6.  
determines whether fan control will be  
After properly wiring the thermostat, turn on  
power to the system. Momentarily press  
RUN  
through the thermostat or through the heating  
system. If you have an electric heat or other  
system that REQUIRES the thermostat to  
control the fan, set this item ON. This allows  
the thermostat to energize the fan immedi-  
ately on a call for heat. If you are unsure if  
the system requires the thermostat to control  
the fan, contact the equipment manufacturer  
PROGRAM  
to make certain the  
thermostat is in the run program mode, then  
BACK  
FWD  
press TIME  
and TIME  
at the  
same time to enter the User Configuration  
menu. When the display changes to the first  
item in the configuration menu, release the  
(Continued on page 6)  
4
 
INSTALLER TABLE  
NOTE: You must be in the User  
Configuration Menu to enter the  
FWD  
Installer Menu. Press TIME  
BACK  
and TIME  
at same time.  
See  
Page  
Step  
Press Button(s)  
Displayed (Factory Default) Press  
or  
to select:  
COMMENTS  
TIME  
DAY  
Selects:  
4
4
1
SET  
and SET  
HEAT PUMP  
(1)  
2 OR 3  
1. one compressor on Y1.  
2. two compressors on Y1, Y2.  
3. one compressor on W1.  
(hold for approx.  
3 seconds)  
Fan cycles with call for Emergency heat if ON.  
Fan always cycles with pump stages.  
ELECT HEAT FAN  
(ON)  
OFF  
4
4
2
3
4
5
6
7
8
9
TIME FWD  
FWD  
Selects HEAT anticipation adjustment.  
TIME  
9 to 40  
9 to 40  
1 to 40  
SET CYCLE HEAT  
(13)  
FWD  
TIME  
SET CYCLE COOL  
(13)  
Selects COOL anticipation adjustment.  
4
4
6
FWD  
TIME  
SET CYCLE AUX  
(06)  
Selects AUXILIARY stage anticipation adjustment.  
Selects time delay for COOL fan OFF.  
FWD  
TIME  
COOL FAN DELAY OFF  
(00)  
0 to 127 seconds  
FWD  
TIME  
FAN DELAY ON  
(01)  
Selects time delay for fan ON for compressor stages.  
1 to 30 seconds  
0 to 127 seconds  
6
6
6
FWD  
TIME  
HEAT FAN DELAY OFF  
(00)  
Selects time delay for HEAT fan OFF in Emergency  
mode only when ELECT HEAT FAN (Step 2) is ON.  
FWD  
TIME  
Fossil Fuel Kit Alternative option. Turns compressor  
OFF if Auxiliary is ON for longer than one minute.  
(Heat Pump 1 & 2)  
PUMP  
(ON)  
OFF  
Selects compressor short-cycle protection enabled  
or OFF.*  
COMP LOCK  
(OFF)  
ON  
ON  
6
10  
11  
12  
TIME FWD  
FWD  
TIME  
ECON  
(OFF)  
Economizer option. Long Y1 cycles for cooling  
with outdoor air  
6
6
Allows selection of HEAT, EMER and COOL or  
HEAT, EMER, COOL and AUTO with SYSTEM  
button.  
TIME  
HEAT-EMER-OFF-COOL- HEAT-EMER-OFF-COOL  
AUTO  
FWD  
Selects Remote Sensor A (connected to SA) if ON.  
Selects Remote Sensor B (connected to SB) if ON.  
Selects Remote Sensor C (connected to SC) if ON.  
13  
14  
TIME  
REMT SEN A  
(OFF)  
ON  
ON  
6
6
FWD  
FWD  
REMT SEN b  
(OFF)  
TIME  
FWD  
REMT SEN C  
(OFF)  
6
7
TIME  
ON  
15  
16  
FWD  
STAT SEN L  
(ON)  
OFF  
When OFF, disables local sensor if a remote sensor  
is enabled.  
TIME  
Returns to normal operation  
PROGRAM  
RUN  
* NOTE: COMP LOCK OFF permanently  
defeats compressor lockout. You must turn  
this selection ON if you do not have a  
system that already provides compressor  
short-cycle protection. Please see “Lockout  
Bypass Option” to temporarily override  
compressor lockout.  
5
 
The chart below shows how this adjustment  
range affects thermostat performance.  
need for a separate fossil fuel kit, although  
we recommend that you consult the heat  
pump system manufacturer before using this  
feature instead of a kit. This item will allow  
the thermostat to turn the heat pump  
ECONOMIZER FEATURE.  
(Installer table step 11). This item allows  
longer Y1 cycles for cooling with outdoor  
air.  
PROGRAMMABLE COOL FAN-OFF  
AND FAN-ON DELAY.  
(Installer table steps 6 and 7.) These items  
allow a selection of 0 to 127 seconds of fan-  
off delay after the thermostat has satisfied the  
call for cool, or a fan-on delay of 1 to 30  
seconds on a call for cool (or heat pump  
compressor activation).  
compressor off if the auxiliary is on for more  
than one minute, to prevent compressor head  
pressure from getting too high. To use this  
feature instead of a kit, select PUMP OFF.  
DISABLING AUTOMATIC  
CHANGEOVER MODE.  
(Installer table step 12). This thermostat, as  
configured at the factory, provides automatic  
changeover, which allows the thermostat to  
switch between heating and cooling to  
maintain temperature. In this configuration,  
when you press the SYSTEM button, the  
thermostat will go through HEAT-EMER-  
OFF-COOL-AUTO. Select HEAT-EMER-  
OFF-COOL to disable the automatic  
changeover feature.  
COMPRESSOR LOCKOUT.  
(Installer table step 10). This thermostat is  
capable of protecting the system against  
premature compressor failure by “locking  
out” the compressor for at least five minutes  
after each cycle. When the thermostat is in  
compressor lockout, the word COOL will  
flash on the display. With heat pump  
systems, the word HEAT will flash if the  
lockout occurs during a heat cycle. During  
this period, the compressor will not be  
energized.  
The fan-off delay allows the fan to continue  
running after the compressor has shut off.  
This distributes the cool air that would  
otherwise stay trapped in the air conditioning  
coils through the ducts. Ideally the timing  
would be set so the fan shuts off just as the  
cool air is exhausted. If this timing is set too  
long the fan may begin blowing warm air  
before it shuts off. Shortening the fan-off  
delay will prevent this.  
OPTIONAL REMOTE TEMPERA-  
TURE SENSE.  
(Installer table steps 13 through 15). Up to  
three remote sensors (part # F145-1328) can  
be attached to this thermostat to sense indoor  
temperature at locations away from the  
thermostat. Each sensor may be located as  
far as 200 feet away from the thermostat.  
This is an excellent feature if the thermostat  
is in a poor location for sensing temperature  
or if you want to install the thermostat in a  
separate room to prevent tampering. (Refer  
to the installation instructions included with  
the remote sensor for proper installation and  
wiring.) After installing and connecting the  
remote sensor(s) to the thermostat, use these  
menu items to enable each remote indoor  
temperature sensor (A, b and/or C). Note that  
if SENSOR A, b or C are set to ON in the  
menu, but no sensor is installed, or if the  
sensor is not functioning, when you exit the  
menu, CHECK STAT SYSTEM will be  
displayed. To correct this, check for proper  
remote sensor installation and wiring. If  
necessary, return to the menu and be sure that  
the remote sensor items are set correctly.  
A short delay to allow the A-coil to cool  
off (or warm up in heat pump) before the  
fan turns on may be preferred. This also  
allows the compressor and the fan to come  
on at slightly different times, which allows  
full power to the compressor on start up.  
Recommended setting for fan-on delay is  
10 seconds or less. A system that does not  
have a high head pressure cutout should  
have a delay of 10 seconds or less.  
If the system has short-cycle protection, this  
item should not need to be enabled. How-  
ever, if your system does not have short-  
cycle protection, turn COMP LOCK ON.  
This will protect the compressor from short-  
cycling and potential premature compressor  
failure.  
Note that COMP LOCK OFF permanently  
disables compressor lockout. If you need to  
temporarily disable compressor lockout,  
please see Lockout Bypass Option.  
PROGRAMMABLE HEAT FAN-OFF  
DELAY.  
Lockout Bypass Option  
(Installer table step 8.) This item allows a  
selection of 0 to 127 seconds of fan-off delay  
after the thermostat has satisfied the call for  
heat when ELECT HEAT FAN is selected  
ON and system is in Emergency mode.  
FOR QUALIFIED SERVICE TECH-  
NICIANS’ USE ONLY.  
HOMEOWNERS SHOULD NOT USE  
THIS FEATURE DUE TO POSSIBIL-  
ITY OF EQUIPMENT OR PROP-  
ERTY DAMAGE, OR PERSONAL  
INJURY.  
The fan-off delay allows the fan to continue  
running after the burner, heating element,  
etc. has shut off. This distributes the heat that  
would otherwise stay trapped in the ducts.  
Ideally the timing would be set so the fan  
shuts off just as the warm air is exhausted. If  
this timing is set too long the fan may begin  
blowing cool air before it shuts off. Shorten-  
ing the fan-off delay will prevent this.  
COMPRESSOR SHORT TERM CYCLE  
PROTECTION  
The temperature at each remote sensor can  
be displayed by pressing the light button  
twice within one second with the thermostat  
in program run or hold mode. Temperatures  
at the outdoor and indoor remote sensors will  
be displayed with subsequent presses of the  
light button in the following order (if  
If this thermostat has been configured to  
provide short-cycle protection, during the  
5-minute lockout period the thermostat  
will lock out the compressor to allow  
head pressure to stabilize. To override  
this feature for one cycle while testing  
PUMP (FOSSIL FUEL KIT ALTER-  
NATIVE).  
TIME  
thermostat operation, press SET  
(Installer table step 9) This item controls heat  
pump compressor operation with a fossil fuel  
auxiliary. This menu item may eliminate the  
connected): outdoor sensor, sensor L, A, b, C.  
DAY  
and SET  
buttons at the same time.  
(Continued on page 7)  
HEATING  
COOLING  
Anticipation Value Cycle Length Differential Temperature Cycle Length Differential Temperature  
1–8  
9–20  
21–40  
Aux Only  
Shorter  
Longer  
0.4–0.6°F (0.2–0.3°C)  
0.6–1.0°F (0.3–0.6°C)  
1.0–1.6°F (0.6–0.9°C)  
N/A  
N/A  
Shorter  
Longer  
0.6–1.0°F (0.3–0.6°C)  
1.0–1.6°F (0.6–0.9°C)  
These numbers are approximate and represent operation with a typical system. Actual  
temperature differentials and run times may vary widely based on your building and equip-  
ment, as well as outdoor temperature conditions.  
6
 
(Installer table step 16). If you wish to sense  
indoor temperature using ONLY the remote  
sensor(s), use this menu item to disable the  
temperature sensor in the thermostat  
(designated as the L sensor).  
OUTDOOR TEMPERATURE  
SENSE.  
OPTIONAL ACTIVATE RUN PRG  
BY TELEPHONE  
This thermostat can also display outdoor  
temperature, if you install an outdoor remote  
sensor with an outdoor temperature sensor  
probe (F145-1378). Refer to the remote  
sensor installation instructions for proper  
installation and wiring. Refer to the Operat-  
ing Instructions to enable this feature and  
display outdoor temperature on the thermo-  
stat.  
With the optional X-10 Telephone Responder  
(Model TR551, Radio Shack catalog RSU#  
10037778) and Universal Low Voltage  
Module (UM506, Radio Shack catalog RSU#  
10037752) installed, you can make a  
telephone call to run your program if the  
thermostat has been set to Hold or Vacation  
Hold. Figure 3 shows typical wiring  
connections for installing the X-10 equip-  
ment. The switch on the Universal Low  
Voltage module must be set to the “Momen-  
tary” position.  
When operating with remote sensor(s), the  
thermostat will calculate an average of the  
sensed temperatures in all enabled sensor  
locations (A, B, C and/or L), then display the  
average temperature as the room tempera-  
ture. During programming, you can also  
assign each enabled sensor different  
priorities during different program periods.  
This allows the system to maintain a  
comfortable environment by giving higher  
priority to occupied locations. At the same  
time, efficient system operation is enhanced  
by giving lower priority to unoccupied  
locations. For detailed instructions on this  
feature, see the Operating Instructions.  
This option must be enabled on the User  
menu (see Operating Instructions).  
PH  
After using the Installer menu to properly  
configure the thermostat for your system,  
RUN  
4
press PROGRAM  
.
1
2
1
3
Thermostat terminals  
1
2
3
4
5
4
X-10 Universal Low Voltage Module  
X-10 Telephone Responder Module  
To 115 VAC power source  
To telephone line  
C
5
Figure 3. Optional X-10 connection  
CHECK THERMOSTAT OPERATION  
FAN OPERATION  
COOLING SYSTEM  
HEAT PUMP AUXILIARY  
OPERATION TEST  
If your system does not have a G terminal  
connection, skip to “Heating System”  
section.  
CAUTION  
!
Follow these steps to energize all stages of  
heat or cool to permit system checks during  
installation.  
To prevent compressor and/or property  
damage, if the outdoor temperature is  
below 50°F (10°C), DO NOT operate the  
cooling system.  
1. Turn power on to the system.  
HEAT: Press  
to raise temperature  
RUN  
2. Press PROGRAM  
.
setting to 99°F, then hold for five seconds.  
The second and third stage heat relays will  
energize immediately for test purposes. The  
LED indicator will glow green for first stage  
and yellow for second stage.  
FAN  
RUN  
3. Press  
until FAN ON is displayed.  
1. Press PROGRAM  
.
The fan should begin to operate.  
SYSTEM  
2. Press  
3. Press  
until COOL is displayed.  
FAN  
4. Press  
until FAN AUTO is  
to adjust thermostat setting  
displayed. The fan should stop operating.  
below room temperature. The fan should  
come on (after the fan-on delay time, if any),  
followed by cold air circulation.  
COOL: Press  
to lower temperature  
HEATING SYSTEM  
setting to 45°F, then hold for five seconds.  
The second stage cool relay will energize  
immediately for test purposes. The LED  
indicator will glow green for first stage and  
yellow for second stage.  
RUN  
1. Press PROGRAM  
.
4. Press  
to adjust temperature setting  
SYSTEM  
2. Press  
until HEAT is displayed. If  
above room temperature. The cooling system  
should stop operating, and the fan should  
stop running (after the fan-off delay time, if  
any).  
the heating system has a standing pilot,  
ensure that it is lit.  
EMERGENCY: Press  
to select  
SYSTEM  
3. Press  
to adjust thermostat setting  
EMER mode. The LED indicator will glow  
red for emergency mode. A flashing light  
indicates a malfunction in the system.  
above room temperature. The heating system  
should begin to operate.  
4. Press  
to adjust temperature below  
room temperature. The heating system  
should stop operating.  
7
 
TROUBLESHOOTING  
To reset the thermostat, press and release  
RESET BUTTON  
RESETTING THERMOSTAT CON-  
FIGURATION AND PROGRAM-  
MING  
RUN  
FAN  
PROGRAM  
, then press the  
,
If the thermostat does not respond when keys  
are pressed, or the thermostat is not operating  
properly, you may use the reset button  
located on the back of the thermostat body  
(see fig. 2). Thermostat programming and  
configuration will not be affected by  
pressing the reset button. However, the clock  
will need to be reset.  
BACK  
TIME  
and buttons at the same  
time. This will reset the thermostat to factory  
default programs and configuration. The  
display will momentarily go blank, then all  
segments on the display will momentarily be  
shown. The thermostat will then go into the  
HOLD mode and will maintain factory preset  
temperatures.  
The thermostat can be reset back to default  
programs and configuration. Removing  
power from the thermostat will not reset it,  
because the default settings are maintained in  
permanent memory. Before resetting the  
thermostat, you may want to make note of  
the previously selected configuration and  
programming. You must reconfigure and  
reprogram the thermostat after resetting it  
using this method.  
WHITE-RODGERS  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
ST. LOUIS, MISSOURI 63123-5398  
 

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