White Rodgers MP3 Player 1F83 277 User Manual

1F83-277  
Heating & Air Conditioning  
Non-programmable,AutoChangeover,Multi-Stage/Heat  
PumpThermostat  
INSTALLATION INSTRUCTIONS  
Operator: Save these instructions for future use!  
FAILURETOREADANDFOLLOWALLINSTRUCTIONSCAREFULLYBEFORE  
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL  
INJURY AND/OR PROPERTY DAMAGE.  
PREPARATIONS  
YOUR THERMOSTAT REPLACES  
Description  
Assemble tools required as shown below.  
Heat Pump (No Aux. or Emergency Heat)  
Heat Pump (with Aux. or Emergency Heat)  
Standard Heat & Cooling Systems  
Two Stage Heat & Two Stage Cool  
Standard Heat Only Systems  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
FLAT BLADE SCREWDRIVER  
WIRE CUTTER/STRIPPER  
HAND OR POWER  
DRILL WITH 3/16 INCH  
DRILL BIT, IF NEEDED  
Millivolt Heat Only Systems – Floor or Wall Furnaces  
Standard Central Air Conditioning  
Gas or Oil Heat  
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—  
THERMOSTAT DOES NOT NEED TO BE LEVEL TO WORK PROPERLY  
Electric Furnace  
Hydronic (Hot Water) Zone Heat – 2 Wires  
Hydronic (Hot Water) Zone Heat – 3 Wires  
REMOVINGOLDTHERMOSTAT  
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.  
Before removing wires from old thermostat's switching sub-  
base, label each wire with the terminal designation it was  
removed from.  
Y2  
C
R
E/W1  
Y1  
1. Shut off electricity at the main fuse box until installation is  
complete. Ensure that electrical power is disconnected.  
O
B
L
W2  
G
Mounting  
Hole  
Mounting  
Hole  
ELEC.  
ON  
GAS  
2. Remove Old Thermostat: A standard heat/cool  
thermostat consists of three basic parts:  
a. The cover, which may be either a snap-on or  
hinge type.  
Elec-Gas  
Switch  
AUTO  
b. The base, which is removed by loosening all  
captive screws.  
Figure 1 – Thermostat base  
c. The switching subbase, which is removed by  
unscrewing the mounting screws that hold it on  
the wall or adaptor plate.  
ATTENTION! This product does not contain mercury. How-  
ever, this product may replace a unit which contains mercury.  
3. 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.  
Do not open mercury cells. If a cell becomes damaged, do not  
touch any spilled mercury. Wearing non-absorbent gloves,  
clean up the spilled mercury and place into a container which  
can be sealed. If a cell becomes damaged, the unit should be  
discarded.  
4. Identify each wire attached to the old thermostat.  
5. Disconnect the wires from the old thermostat one at a  
time. DO NOT LET WIRES FALL BACK INTO THE  
WALL.  
Mercury must not be discarded in household trash. When the  
unit this product is replacing is to be discarded, place in a  
suitablecontainerandreturntoWhite-Rodgersat2895Harrison  
Street, Batesville, AR 72501 for proper disposal.  
6. Install new thermostat using the following procedures.  
White-Rodgers is a division  
of Emerson Electric Co.  
PART NO. 37-6509A  
0405  
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WIRINGDIAGRAMS  
NOTE  
Polarity must be observed. If the HOT side of the second transformer  
is jumpered to the COMMON side of the first transformer a short will  
be made. Damage to equipment will occur when power is restored.  
E/W1  
THERMOSTAT  
SYSTEM  
O
B
Y2  
Y1  
G
W2  
C
L
R
Limit or  
Safety  
Switches  
Limit or  
Safety  
Switches  
HOT  
Reversing  
Valve  
Energized in  
Heat, Off,  
Emergency  
Mode  
24 VAC  
120 VAC  
Emergency  
or 1st Aux.  
Stage Relay  
SYSTEM  
MONITOR  
SWITCH  
Reversing  
Valve  
Energized in  
Cool Mode  
2nd Stage  
Compressor  
Fan  
Relay  
NEUTRAL  
24 VAC  
Auxiliary  
Heating  
Transformer  
(Class II  
NOTE  
ACCESSORY  
RELAY N.O.  
CONTACT  
Aux  
Relay  
(Stage 2)  
The accessory relay scheme  
is required when safety  
circuits exist in both systems.  
Compressor  
Contactor  
Current Limited)  
COMMON  
TWO COMMONS MUST  
BE JUMPERED TOGETHER!  
Limit or  
Limit or  
Safety  
Switches  
Safety  
HOT  
Switches  
24 VAC  
120 VAC  
COMMON  
NEUTRAL  
Heat Pump Transformer  
(Class II Current Limited)  
Figure 4. Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems  
Heat Pump Terminal Outputs  
Refer to equipment manufacturers' instructions for specific one transformer. If transformer safety circuits are in only one of  
system wiring information.  
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 trans-  
former, 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.  
Use the terminal output information below to help you wire the  
thermostat properly for your multi-stage system. After wiring,  
see CONFIGURATION section for proper thermostat configu-  
ration.  
This thermostat is designed to operate a single-transformer  
system. If you have a two-transformer system, cut and tape off  
THERMOSTAT TERMINALS (HEAT PUMP)  
W2 E/W1 Y2 Y1  
SYSTEM  
Heat  
L
C
R
G
O
B
Malfunction 24 Volt 24 Volt HeatMode Heatmode  
No  
Heatand  
Blower/FanEnergized Energized Energized  
Pump 1  
Light (Common) (Hot) 3rd stage 2ndstage Output  
Coolmode  
1st stage  
(compressor) Set GAS/ELEC switch  
for Emergency mode  
on call for Heat  
andCool  
in Cool  
Mode  
in Heat  
OFF  
Emergency  
mode  
Emergency  
mode  
or  
Heat  
Pump 2  
Emergency  
Mode  
2nd  
2ndstage  
stage  
1st stage compressor  
E/W1  
THERMOSTAT  
Y2  
W2  
C
R
B
Y1  
G
O
SYSTEM  
Heat  
Relay  
Compressor  
Contactor  
Stage 2  
Reversing  
Valve  
Reversing  
Valve  
Stage 1  
Hot  
Energized in  
Heat Mode  
Off Emergency  
24 VAC  
120 VAC  
Neutral  
Energized in  
Cool Mode  
Compressor  
Heat  
Relay  
Fan  
Contactor  
Stage 1  
Relay  
TRANSFORMER  
(Class II, Current Limited)  
Stage 2  
Figure 5. Typical wiring diagram for single transformer multi-stage systems  
3
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Multi-Stage Terminal Outputs  
Refer to equipment manufacturers' instructions for specific one transformer. If transformer safety circuits are in only one of  
system wiring information.  
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 trans-  
former, the two commons must be jumpered together.  
You can configure the thermostat for use with either multi-stage  
electric heat systems or multi-stage gas systems. When con-  
figured for electric heat, the G terminal (blower/fan) will be  
energized on a call for heat.  
Use the terminal output information below to help you wire the  
thermostat properly for your multi-stage system. After wiring,  
see CONFIGURATION section for proper thermostat configu-  
ration.  
This thermostat is designed to operate a single-transformer  
system. If you have a two-transformer system, cut and tape off  
THERMOSTAT TERMINALS (MULTI-STAGE)  
W2 E/W1 Y2 Y1  
SYSTEM  
L
C
R
G
O
B
Multi-stage Malfunction 24 Volt 24 Volt HeatMode Heatmode CoolMode CoolMode Blower/FanEnergized Energized Energized  
Light  
(Common) (Hot) 2ndstage 1st stage 2ndstage 1st stage  
on call for Cool (and  
Heat if configured  
to Electric Heat)  
in Cool in Heat, Off,  
Mode  
Emergency  
Modes  
CHECKTHERMOSTATOPERATION  
Emergency System  
NOTE  
EMER bypasses the Heat Pump to use the heat source  
wired to terminal E on the thermostat. EMER is typically  
used when compressor operation is not desired, or you  
prefer back-up heat only.  
To prevent static discharge problems, touch side of  
thermostat to release static build-up before touching  
any keys.  
1. Press SYSTEM button to select EMER. EMER will flash  
on the display.  
If at any time during testing your system does not operate  
properly, contact a qualified serviceperson.  
2. Press  
to adjust thermostat setting above room  
temperature. The Aux. heating system will begin to  
operate. The display will show STG1 flashing EMER  
Fan Operation  
If your system does not have a G terminal connection, skip to  
Heating System.  
and flame icon ( ) to indicate that the Aux. system is  
operating.  
3. Adjust temperature setting to 3° above room temperature.  
The auxiliary heat system should begin to operate and the  
display should show STG 1+2.  
1. Turn on power to system.  
2. Move fan switch to ON position. The blower should begin  
to operate.  
3. Move fan switch to AUTO position. The blower should  
stop immediately.  
4. Press  
to adjust the thermostat below room tempera-  
ture. The Aux. heating system should stop operating.  
CAUTION  
!
CAUTION  
To prevent compressor and/or property damage, if  
the outdoor temperature is below 50°F, DO NOT  
operate the cooling system.  
!
Do not allow the compressor to run unless the com-  
pressor oil heaters have been operational for 6 hours  
and the system has not been operational for at least  
5 minutes.  
Cooling System  
Heating System  
1. Press SYSTEM button to select the Snowflake icon ( ).  
1. Press SYSTEM button to select the Flame icon ( ). If  
the auxiliary heating system has a standing pilot, be sure  
to light it.  
2. Press  
to adjust thermostat setting below room  
temperature. The blower should come on immediately on  
high speed, followed by cold air circulation. The display  
should show STG1.  
2. Press  
to adjust thermostat setting to 1° above room  
3. Adjust temperature setting to 3° below room temperature.  
The second stage cooling should begin to operate and  
the display should show STG 1+2.  
temperature. The heat pump system should begin to  
operate. The display should show STG1. However, if the  
set point temperature display is flashing, the compressor  
lockout feature is operating (see Configuration menu,  
item 5).  
4. Press  
to adjust the temperature setting above room  
temperature. The cooling system should stop operating.  
3. Adjust temperature setting to 3° above room temperature.  
If your system configuration is set at MS2, HP2 or HP1,  
the auxiliary heat system should begin to operate and the  
display should show STG 1+2.  
4. Press  
to adjust the thermostat below room tempera-  
ture. The heating system should stop operating.  
4
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OPERATION  
Before you begin programming 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, pull it straight out from the base. To replace  
the cover, line up the cover with the base and press until the  
cover snaps onto the base.  
The Thermostat Buttons and Switches  
Raises temperature setting  
1
2
3
4
Lowers temperature setting.  
FAN switch (ON, AUTO)  
SYSTEM button (COOL, AUTO, HEAT, EMER, OFF)  
STG1+2  
The Display  
FAULT  
Flame icon ( ) is displayed when the system is in  
HEAT mode. Snowflake icon ( ) is displayed when  
5
6
EMER  
the system is in COOL mode. Flame icon ( ) and  
Snowflake icon ( ) are displayed simultaneously  
when thermostat is in AUTO mode.  
Figure 6 – Thermostat display, buttons and switches  
Displays BATT when the 2 "AA" batteries are low and  
should be replaced. Only BATT and LO are displayed  
when batteries are low with no system power.  
EMER is displayed flashing when the system is in  
EMER mode.  
11  
12  
Displays current temperature or LO when batteries  
are low.  
7
8
9
Indicates a fault in the heating/cooling system. It does  
not indicate a fault in the thermostat.  
Displays currently programmed set temperature (this  
is blank when SYSTEM is OFF).  
Display ( ) when limited range is activated.  
13  
14  
Stage1 & 2 indicators: The thermostat shall indicate  
when the first and second stage is energized except  
in emergency mode. The icon is STG 1 for the first  
stage energized. The icons for the first and second  
stage energized are STG1+2 located in the upper  
right side of the display.  
Displays FLTR when the system has run for the  
programmed filter time period as a reminder to change  
or clean your filter.  
Display ( ) when in keypad lockout mode.  
10  
CONFIGURATION MENU  
The configuration menu allows you to set certain thermostat  
operating characteristics to your system or personal require-  
ments.  
2) Fast or Slow Cycle Selection – The factory default setting  
is fast cycle, which cycles 1st stage at approximately 1.2°F  
and 2nd stage 0.75°F. If you prefer slow cycle, press the  
temperature key to change to SL. The 1st stage and 2nd  
stage would be 1.5°F and 1.2°F respectively.  
Set SYSTEM button to OFF, then simultaneously press  
and  
to enter configuration menu. The display will  
3) Select Compressor Lockout CL OFF or ON – Selecting  
CL 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 and heating cycles. This is intended to help protect  
the compressor from short cycling. Some newer compres-  
sors already have a time delay built in and do not require  
this feature. Your compressor manufacturer can tell you if  
the lockout feature is already present in their system. When  
the thermostat compressor time delay occurs it will flash the  
setpoint for about five minutes.  
show the first item in the configuration menu.  
The configuration menu table summarizes the configuration  
options. An explanation of each option follows.  
Press SYSTEM to change to the next menu item. To exit the  
menu and return to the program operation, press RUN. If no  
keys are pressed within fifteen minutes, the thermostat will  
revert to normal operation.  
1) Single Stage, Multi-stage or Heat Pump System  
Configuration – This control can be configured for Heat  
Pump or two stage heat/two stage cool multi-stage opera-  
tion. The display indicates MS 2 (default for multi-stage  
mode) in the display. The Multi-stage configuration can be  
toggled to SS1, HP2, or HP1 by pressing the Tempera-  
ture Up or Temperature Down key. In Multi-stage configu-  
ration, system button will not have EMERgency mode.  
5
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Press the System button until  
                                                                                                
O
                                                                                                 
                                                                                                   
F
                                                                                                   
                                                                                                      
F
                                                                                                      
is displayed, then press the  
and  
simultaneously  
Comments  
CONFIGURATION MENU  
INSTALLER/CONFIGURATION MENU  
Press  
Displayed  
Press  
or  
Step  
1
Button(s) (Factory Default)  
to select  
System  
MS 2  
FA  
SS1, HP2, HP1  
Selects Single stage, Multi-stage, or Heat Pump  
(Single stage or 2-stage) System Configuration  
2
3
System  
System  
SL  
Selects Fast or Slow Cycle Selection  
CL  
CL  
Selects Compressor Lockout CL OFF or ON  
(OFF)  
(ON)  
4
5
System  
System  
CDL  
(ON)  
CDL  
(OFF)  
Selects Backlight Display  
FA  
FA  
Selects Fast Second Stage ON or OFF  
(ON)  
(OFF)  
6
7
System  
System  
0 FLTR  
50-1950 (increments of 50)  
4 LO to 4 HI  
Selects filter replacement run time  
0°F  
Selects Temperature Display Adjustment 4 LO to 4 HI  
(Room Temperature)  
8
9
System  
System  
°F  
°C  
For °C selection  
LR  
LR 62 to LR89  
Selects Limited HEAT range  
(90)  
10  
11  
System  
System  
System  
LR  
(45)  
LR 46 to LR 82  
Selects Limited COOL range  
Feature Not Available  
CA  
(OFF)  
CA  
(ON)  
12  
13  
(OFF)  
0
(ON)  
Selects Keypad Lockout  
001 to 999  
Selects Keypad lockout combination number  
Press System to set code  
14  
System  
Returns to the OFF position  
7) Select Temperature Display Adjustment 4 LO to 4 HI –  
Allows you to adjust the room temperature display up to 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. The cur-  
rent or adjusted room temperature will be displayed on the  
left side of the display.  
4) Select Backlight Display – The display backlight improves  
display contrast in low lighting conditions. When the "C"  
terminal is powered, selecting backlight CdL ON will keep  
the light on continuously. Select backlight OFF will keep  
the light on momentarily after any key is pressed. When the  
"C" terminal is not powered, the light will be on momentarily  
after any key is pressed no matter the backlight is selected  
ON or OFF.  
8) Select F° or C° Readout – Changes the display readout  
to Centigrade or Fahrenheit as required.  
5) Select (Fast) Second Stage ON or OFF – In the run mode,  
if the setpoint temperature is manually raised by 3°F (2°C)  
or more above the actual temperature with the , and the  
fast second stage feature is enabled, FA ON, the second  
stage will energize immediately. With FA OFF, second  
stage will not energize until the setpoint temperature is 1°F  
or more above actual temperature for more than ten min-  
utes.  
9) Limited Heat Range – This feature provides a maximum  
setpoint temperature for heat. The default setting is 90°F. It  
can be changed between 62°F and 89°F by pressing the  
temperature up or temperature down key.  
10) Limited Cool Range – This feature provides a minimum  
setpoint temperature for cool. The default setting is 45°F. It  
can be changed between 46°F and 82°F by pressing the  
temperature up or temperature down key.  
6) Select filter replacement run time – The thermostat will  
display FLTR after a set time of operation. This is a remind-  
er to change or clean your air filter. This time can be set from  
0 to 1950 hours in 50 hour increments. A selection of 000  
will cancel this feature. When FLTR is displayed, you can  
clear it by pressing HOLD and RUN at the same time. This  
resets the timer and starts counting the hours until the next  
filter change. Contact your system manufacturer for a  
specific replacement/maintenance interval.  
11) This feature not available.  
6
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CONFIGURATIONMENU  
While the keypad is locked out, a simultaneous press of the  
12 & 13) Keypad Lockout – This menu selection will display  
lock icon. The and are used to toggle the function and  
temperature  
and  
will enter the menu item from any  
mode instead of only OFF mode. When the menu is  
entered with the keypad lockout feature enabled, the first  
display the lock icon and OFF (keypad not locked out,  
default) indicating in the time digits to the lock icon and ON  
(keypad locked out). When the keypad lockout function is  
enabled (ON), and the SYSTEM key is pressed again, the  
display will indicate the number 0 (default, still disabled) in  
menu item displayed is the combination code 0. The  
or  
keys are used to set the combination unlock number  
from0 to999.Iftheunlocknumbermatchesexactlywiththe  
combination lock number stored in memory when the  
SYSTEM key is pressed, the keypad is unlocked and the  
lock icon is removed. If the unlock number does not match  
when the SYSTEM key is pressed, menu is exited and the  
keypad remains disabled.  
the time digits. The  
and  
are used to set the combina-  
tionnumberfrom 0 to999. "0"willnotbeavalidcombination.  
If a combination of 0 is selected and the system key is  
pressed the menu will be exited and keypad lockout will not  
be evoked. If 1 to 999 is selected and the SYSTEM key is  
pressed again, the combination is locked into non-volatile  
memory and the menu is exited. The lock icon (to designate  
keypad locked with a valid combination) will display when  
the menu is exited. The system key will operate for 10  
seconds after the menu mode is exited to allow the user to  
change the mode from OFF to the desired system mode.  
To reset the combination code and unlock the keypad if the  
code is forgotten, see troubleshooting section.  
SPECIFICATIONS  
ELECTRICAL DATA  
THERMAL DATA  
Electrical Rating:  
Setpoint Temperature Range:  
45°F to 90°F (7°C to 32°C)  
Operating Ambient Temperature Range:  
32°F to 105°F  
20 to 30 VAC 50/60 Hz or DC  
0.05 to 1.5 Amps (Load per terminal)  
2.5 Amps Maximum Total Load (All terminals combined)  
Operating Humidity Range:  
0 to 90% RH (non-condensing)  
Shipping Temperature Range:  
-40°F to 150°F  
OPERATION  
Second Stage Time Delay  
The system "mode" is selected by pressing the SYSTEM  
button. Icons on the bottom right corner of the display will  
Your thermostat is designed to determine the optimum time to  
activate the second stage. Simply raising the temperature in  
heating or lowering it in cooling will not always force the  
thermostat to bring the second stage on quickly. There is a time  
delay from 0-30 minutes depending on the performance of the  
first stage of the system.  
indicatethemode:COOL ( ),AUTO (  
),HEAT ( ),EMER,  
or OFF. In any mode except OFF, the setpoint temperature will  
be shown on the right side of the display. In OFF, this area will  
be blank. The current temperature will be displayed on the left  
side of the display.  
To operate properly in the AUTO mode, the heat setpoint  
temperature cannot be the same as or higher than the cool  
setpoint temperature. The heat setpoint must be at least 1°  
lower than the cool setpoint.  
EXAMPLE: For the last 2 hours the thermostat is set on 70° and  
the room temperature is 70° with the equipment using only the  
first stage of heat. Since the equipment is keeping the tempera-  
turewithin1degreeofsetpoint, thethermostatwilldelaysecond  
stage for a longer time if you manually raise the temperature or  
if the room temperature quickly changes. Once the second  
stage comes on, it will come on sooner the next time there is a  
difference between the setpoint and the room temperature. The  
net effect of the staging program is that when the first stage is  
capable of making temperature the second stage will delay  
longer. When the thermostat calculates that first stage cannot  
make temperature in a reasonable time, the second stage will  
come on sooner. This built in function automatically optimizes  
the use of additional stages of heat or cool.  
Automatic System Changeover  
When the thermostat is in the AUTO mode, both the Flame and  
Snowflake icons are displayed. The thermostat will call for heat  
or cool depending on the room temperature. The setpoint  
temperature displayed will be that of the last mode called. If the  
lastsystemcyclewasheat, the HEAT setpointwillbedisplayed.  
IftheroomtemperatureraisesabovetheHEAT setpointandthe  
COOL setpoint and a call for cool is required, the temperature  
displayed will change to be the COOL setpoint.  
7
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TROUBLESHOOTING  
Reset Operation  
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the  
thermostat by removing the wires from terminals R and C and removing batteries for 2 minutes. After resetting the thermo-  
stat, replace the wires and batteries. If the thermostat has been reset and still does not function correctly contact your  
heating/cooling service person or place of purchase.  
Possible Cause  
Corrective Action  
Symptom  
1.Blown fuse or tripped circuit breaker.  
2.Furnace power switch to OFF.  
Replace fuse or reset breaker.  
Turn switch to ON.  
No Heat/No Cool/No Fan  
(common problems)  
3.Furnace blower compartment door or  
panel loose or not properly installed.  
Replace door panel in proper position to engage  
safety interlock or door switch.  
1.Pilot light not lit.  
Re-light pilot.  
No Heat  
2.System Switch not set to HEAT.  
Set System Switch to HEAT and raise setpoint  
above room temperature.  
3.Loose connection to thermostat or  
system.  
Verify thermostat and system wires are securely  
attached.  
4.Furnace Lock-Out Condition. Heat  
may also be intermittent.  
Many furnaces have safety devices that shut down  
when a lock-out condition occurs. If the heat works  
intermittently contact the furnace manufacturer or  
local service person for assistance.  
5.Heating system requires service or  
thermostat requires replacement.  
Diagnostic: Set System Switch to HEAT and raise  
the setpoint above room temperature. Within a few  
seconds the thermostat should make a soft click  
sound. This sound usually indicates the thermostat  
is operating properly. If the thermostat does not  
click, try the reset operation listed above. If the  
thermostat does not click after being reset contact  
your heating and cooling service person or place of  
purchase for a replacement. If the thermostat  
clicks, contact the furnace manufacturer or a  
service person to verify the heating is operating  
correctly.  
1.System Switch not set to COOL.  
Set System Switch to COOL and lower setpoint  
below room temperature.  
No Cool  
2.Loose connection to thermostat or  
system.  
Verify thermostat and system wires are securely  
attached.  
3.Cooling system requires service or  
thermostat requires replacement.  
Same procedure as diagnostic for No Heat condi-  
tion except set the thermostat to COOL and lower  
the setpoint below the room temperature. There  
may be up to a five minute delay before the  
thermostat clicks in Cooling.  
1.Possible short in wiring.  
2.Possible short in thermostat.  
3.Possible short in heat/cool/fan  
system.  
Check each wire connection to verify they are not  
shorted or touching together. No bare wire should  
stick out from under terminal screws. Try resetting  
the thermostat as described above. If the condition  
persists the manufacturer of your system or service  
person can instruct you on how to test the Heat/  
Cool system for correct operation. If the system  
operates correctly, replace the thermostat.  
Heat, Cool or Fan  
Runs Constantly  
4.Fan Switch set to Fan On.  
1.The location of the thermostat and/or  
the size of the Heating System may  
be influencing the cycle rate.  
Digital thermostats normally provide precise  
temperature control and may cycle faster than  
some older mechanical models. A faster cycle rate  
means the unit turns on and off more frequently but  
runs for a shorter time so there is no increase in  
energy use. If you would like to increase the cycle  
time, choose SL for slow cycle in the menu, step 4.  
If an acceptable cycle rate is not achieved as  
received or by choosing slow cycle, contact a local  
service person for additional suggestions.  
Furnace  
(Air Conditioner)  
Cycles Too Fast  
or Too Slow (narrow or  
wide temperature swing)  
8
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TROUBLESHOOTING  
Possible Cause  
Corrective Action  
Symptom  
1.Thermostat thermometer setting  
requires adjustment.  
The thermometer can be adjusted +/- 3 degrees.  
See Temperature Display Adjustment in the  
Configuration Menu section.  
Thermostat Setting &  
Thermostat Thermometer  
Disagree  
1.Voltage spike or static discharge.  
Use the Reset Operation at top of previous page.  
Blank Display and/or  
Keypad Not Responding  
1.The desired setpoint conflicts with the Change system mode to COOL. Raise the Cool  
Heat Setpoint will  
not Respond to the  
Temperature Up Key  
setpoint of the COOL mode.  
setpoint. Return to HEAT mode and set desired  
temperature.  
1.The desired setpoint conflicts with the Change system mode to HEAT. Lower the Heat  
Cool Setpoint will  
setpoint of the HEAT mode.  
setpoint. Return to COOL mode and set desired  
temperature.  
not Respond to the  
Temperature Down Key  
CAUTION: This resets the thermostat to factory  
default settings of the configuration menu. After  
performing this reset, the thermostat will require  
configuration again. Be sure that you know the  
required configuration settings before resetting.  
Forgot Keypad  
Lockout Code  
With the thermostat in any mode, press  
and  
at the same time to enter the configuration menu at  
the point where the lockout code is to be entered.  
Press  
and  
and SYSTEM button at the same  
time to reset the lockout code, unlock the keypad  
and reset all configuration menu settings.  
Your thermostat is designed to determine the  
optimum time to activate the second stage. Simply  
raising the temperature in heating or lowering it in  
cooling will not always force the thermostat to bring  
the second stage on quickly. There is a time delay  
from 0-30 minutes depending on the performance  
of the first stage of the system.  
Why won't my 2nd or  
3rd stage come on?  
9
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The Emerson logo is a  
trademark and a service mark  
of Emerson Electric Co.  
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