White Rodgers 500 User Manual

CONTENTS  
Installation Instructions for  
Preparations.................................................. 1  
Thermostat Details ........................................ 1  
Removing Old Thermostat ......................... 1-2  
Mounting and Wiring .................................. 2-3  
Check Thermostat Operation ..................... 4-5  
Specifications ................................................ 5  
Troubleshooting ......................................... 5-6  
Heating & Air Conditioning  
Model 500  
Non- Programmable  
Heat Pump Thermostat  
YOUR THERMOSTAT REPLACES  
PREPARATIONS  
1
Assemble tools required as shown below.  
Description  
Heat Pump (No Aux or Emergency Heat)  
Heat Pump (with Aux or Emergency Heat)  
Standard Heat & Cooling Systems  
Standard Heat Only Systems  
Yes  
Yes  
No  
No  
No  
No  
No  
No  
No  
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  
Failure to follow and read all instructions carefully  
before installing or operating this control could cause  
personal injury and/or property damage.  
Hydronic (Hot Water) Zone Heat – 2 Wires  
Hydronic (Hot Water) Zone Heat – 3 Wires  
THERMOSTAT DETAILS  
REMOVING OLD THERMOSTAT  
2
3
CAUTION  
!
Mounting  
hole  
To prevent electrical shock and/or equipment damage,  
disconnect electrical power to the system at the main  
fuse or circuit breaker until installation is complete.  
Before removing wires from old thermostat’s switching subbase,  
label each wirewith the terminal designation it was removed from.  
1. 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.  
b. The base, which is removed by loosening all captive screws.  
O/B  
Terminal  
Switches  
Selection  
c. The switching subbase, which is removed by unscrewing  
themountingscrewsthatholditonthewalloradaptorplate.  
2. Shut off electricity at the main fuse box until installation is  
complete. Ensure that electrical power is disconnected.  
3. Remove the front cover of the old thermostat. With wires still  
attached, removewallplatefromthewall.Iftheoldthermostat  
has a wall mounting plate, remove the thermostat and the wall  
mounting plate as an assembly.  
W906 for Emergency  
Heat Second Stage  
Fan Control  
W904  
Clip for  
Celsius  
Mounting  
hole  
W905  
Clip for  
Slow Cycle  
4. Identifyeachwireattachedtotheoldthermostatusingthe  
labels enclosed with the new thermostat.  
Figure 1. Thermostat base  
5. Disconnectthewiresfromtheoldthermostatoneatatime.DO  
NOT LET WIRES FALL BACK INTO THE WALL.  
6. Install new thermostat using the following procedures.  
WHITE-RODGERS  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
ST. LOUIS, MISSOURI 63123-5398  
PART NO. 37-6398C  
Replaces 37-6398B  
Printed in U.S.A.  
0341  
MOUNTING AND WIRING  
CONTINUED FROM SECOND PAGE  
4
THERMOSTAT  
SYSTEM  
O/B  
Y
G
W2  
E
C
L
R
See Note **  
SYSTEM  
MONITOR  
SWITCH  
Changeover  
Relay*  
Fan  
Relay  
Emergency  
Relay  
Aux  
Relay  
Compressor  
Contactor  
(Stage 2)  
Hot  
24 VAC  
120 VAC  
Neutral  
* Changeover Relay is energized in COOL when O/B switch is in the “O” position  
Changeover Relay is energized in HEAT when O/B switch is in the “B” position  
TRANSFORMER  
(Class II)  
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency  
Figure 2. Typical wiring diagram for single transformer systems  
NOTE  
If safety circuits are in only one of the systems, remove  
the transformer of the system with NO safety circuits.  
THERMOSTAT  
SYSTEM  
O/B  
Y
G
W2  
E
C
L
R
CUT AND  
TAPE OFF!  
SYSTEM  
MONITOR  
SWITCH  
See Note **  
Changeover  
Relay*  
Fan  
Relay  
Limit or  
Safety  
Switches  
Emergency  
Relay  
HOT  
120 VAC  
NEUTRAL  
24 VAC  
Aux  
Relay  
(Stage 2)  
Compressor  
Contactor  
Hot  
24 VAC  
120 VAC  
Neutral  
TWO COMMONS MUST  
BE JUMPERED TOGETHER!  
TRANSFORMER  
(Class II)  
* Changeover Relay is energized in COOL when O/B switch is in the “O” position  
Changeover Relay is energized in HEAT when O/B switch is in the “B” position  
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency  
Figure 3. Typical wiring diagram for two transformer systems with NO safety circuits  
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.  
THERMOSTAT  
O/B  
Y
G
W2  
E
C
L
R
SYSTEM  
Limit or  
Safety  
Limit or  
Safety  
See Note **  
HOT  
Switches  
24 VAC  
120 VAC  
Switches  
SYSTEM  
MONITOR  
SWITCH  
Changeover  
Relay*  
Fan  
Relay  
NEUTRAL  
Emergency  
Relay  
24 VAC  
Auxiliary  
Heating  
NOTE  
ACCESSORY  
RELAY N.O.  
CONTACT  
Aux  
Relay  
(Stage 2)  
Transformer  
(Class II)  
The accessory relay scheme  
is required when safety  
circuits exist in both systems.  
Compressor  
Contactor  
COMMON  
TWO COMMONS MUST  
BE JUMPERED TOGETHER!  
Limit or  
Limit or  
Safety  
Switches  
Safety  
HOT  
Switches  
24 VAC  
120 VAC  
* Changeover Relay is energized in COOL when O/B switch is in the “O” position  
Changeover Relay is energized in HEAT when O/B switch is in the “B” position  
COMMON  
NEUTRAL  
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency  
Heat Pump Transformer  
(Class II)  
Figure 4. Typical wiring diagram for two transformer systems with safety circuits in BOTH systems  
Cooling System  
1. Move SYSTEM switch to COOL position.  
CHECK THERMOSTAT OPERATION  
5
2. Press  
ture. The blower should come on immediately on high speed,  
followed by cold air circulation.  
3. Press to adjust temperature setting above room tem-  
to adjust thermostat setting below room tempera-  
NOTE  
To prevent static discharge problems, touch side of ther-  
mostattoreleasestaticbuild-upbeforetouchinganykeys.  
If at any time during testing your system does not operate  
properly, contact a qualified serviceperson.  
perature. The cooling system should stop operating.  
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, 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.  
Fan Operation  
If your system does not have a G terminal connection, skip to  
Heating System.  
1. Turn on power to the 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  
The Thermostat Buttons and Switches  
immediately.  
1
2
3
4
(Up arrow) Raises temperature setting.  
(Down arrow) Lowers temperature setting.  
CAUTION  
Do not allow the compressor to run unless the compres-  
sor oil heaters have been operational for 6 hours and the  
system has not been operational for at least 5 minutes.  
!
FAN switch (ON, AUTO).  
SYSTEM switch (COOL, OFF, HEAT, EMER).  
The Display  
Heating System  
1. Move SYSTEM switch to HEAT position. If the auxiliary  
5
6
Indicates a malfunction with the system.  
heating system has a standing pilot, be sure to light it.  
2. Press  
to adjust thermostat setting to 1° above room  
Flame icon ( ) is displayed when the SYSTEM switch is in  
theHEATposition.Flameicon( )isdisplayedflashingwhen  
2nd-stage heat (Aux or Emergency) is energized. Snow-  
flakeicon( )isdisplayed(non-flashing)whentheSYSTEM  
switch is in the COOL position. Snowflake and Flame icons  
are displayed (flashing) if the thermostat is in lockout mode  
to prevent the compressor from cycling too quickly.  
temperature. The heat pump system should begin to operate.  
However, if the Flame icon ( ) and Snowflake icon ( ) are  
flashing, the compressor lockout feature is operating (see  
Configuration menu, item 3.)  
3. Adjusttemperaturesettingto4° aboveroomtemperature.The  
auxiliary heat system should begin to operate and the Flame  
icon ( ) will be flashing.  
7
8
EMER is displayed flashing when the system switch is in  
EMER position.  
4. Press  
to adjust thermostat setting below room tempera-  
ture. The heating system should stop operating.  
Displays current temperature.  
Emergency System  
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.  
1. Move SYSTEM switch to EMER position. EMER will flash on  
the display.  
2. Press  
toadjustthermostatsettingaboveroomtempera-  
ture. The Aux heating system will begin to operate. The  
Flame icon ( ) will display flashing to indicate that the Aux  
system is operating.  
3. Press  
to adjust the thermostat below room temperature.  
The Aux heating system should stop operating.  
CAUTION  
!
To prevent compressor and/or property damage, if the  
outdoor temperature is below 50°F, DO NOT operate the  
cooling system  
CHECK THERMOSTAT OPERATION  
CONTINUED FROM FOURTH PAGE  
Configuration Menu  
5
Step  
Press Button(s)  
Displayed  
Press  
or  
(Factory Default)  
to select:  
Set SYSTEM  
switch to OFF  
and  
9
1
2
Displays currently programmed set temperature (this is blank  
when SYSTEM switch is in the OFF position).  
FA  
(ON)  
OFF  
ON  
for at least 2 seconds  
10  
“BATT” is displayed when 2 “AAA” batteries are low and  
should be replaced.  
CL  
(OFF)  
and  
momentarily  
3
4
and  
momentarily  
0 HI  
(0)  
3 LO TO  
3 HI  
Configuration Menu  
dL  
(ON)  
The configuration menu allows you to set certain thermostat  
operating characteristics to your system or personal requirements.  
To enter the configuration menu, with SYSTEM switch in OFF  
and  
momentarily  
5*  
6
OFF  
Move SYSTEM  
switch from OFF  
Return to normal operation  
position, hold  
and  
for at least two seconds. To exit the  
configuration menu, move the SYSTEM switch from the OFF  
position.  
* Not available on earlier models  
2. In the run mode, if the setpoint temperature is manually raised  
by 3°F (2°C) or more above the actual temperature with the  
TEMPERATURE UP key, 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 minutes.  
5. SelectBacklitDisplay(Notavailableonearliermodels)The  
display backlight improves display contrast in low lighting  
conditions. Selecting backlight ON will keep the light on  
continuously. Selecting Backlight OFF will keep the light off.  
SPECIFICATIONS  
6
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.Itwillalsowait5minutesminimumbetweencoolingand  
heating 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 com-  
pressor manufacturer can tell you if the lockout feature is  
alreadypresentintheirsystem.Whenthethermostatcompres-  
sor time delay occurs it will flash the Snowflake and Flame  
Icons for about five minutes.  
ELECTRICAL DATA  
Electrical Rating:  
20 to 30 VAC 50/60 Hz.  
0.05 to 1.0 Amps (Load per terminal)  
1.5 Amps Maximum Total Load (All terminals combined)  
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:  
-40°F to 150°F  
4. Select Temperature Display Adjustment 3 LO to 3 HI –  
Allowsyoutoadjusttheroomtemperaturedisplayupto3° 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 current or adjusted  
roomtemperaturewillbedisplayedontheleftsideofthedisplay.  
TROUBLESHOOTING  
7
Reset Operation  
If a voltage spike or static discharge blanks out the display or  
causes erratic thermostat operation you can reset the thermostat  
still does not function correctly contact your heating/cooling ser-  
vice person or place of purchase.  
by pressing  
and  
at the same time when system is  
Batteries  
switched from “OFF” to “HEAT” position. This also resets the  
factory defaults. If the thermostat has power, has been reset and  
For optimum performance, we recommend replacing batteries  
once a year with fresh “AAA” Energizer alkaline batteries.  
®
Symptom  
Possible Cause  
Corrective Action  
No Heat/No Cool/No Fan  
(common problems)  
1. Blown fuse or tripped circuit breaker.  
2. Furnace power switch to OFF.  
Replace fuse or reset breaker.  
Turn switch to ON.  
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.  
TROUBLESHOOTING  
CONTINUED FROM FIFTH PAGE  
7
Symptom  
No Heat  
Possible Cause  
Corrective Action  
1. Pilot light not lit.  
Re-light pilot.  
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 thermo-  
stat 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.  
No Cool  
1. System Switch not set to COOL.  
Set System Switch to COOL and lower setpoint  
below room temperature.  
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  
condition 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.  
Heat, Cool or Fan Runs Constantly.  
1. Possible short in wiring.  
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  
2. Possible short in thermostat.  
3. Possible short in heat/cool/fan system.  
4. Fan Switch set to Fan On.  
service person can instruct you on how to test the  
Heat/Cool system for correct operation. If the  
system operates correctly, replace the thermostat.  
Furnace (Air Conditioning) Cycles Too Fast  
or Too Slow (narrow or wide temperature  
swing)  
1. The location of the thermostat and/or the  
size of the Heating (Cooling) 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, clip Jumper W-905 as  
mentioned in the instructions for Hydronic Heating  
Systems. It is not possible to shorten the cycle  
time. If an acceptable cycle rate is not achieved as  
received or by clipping W-905 contact a local  
service person for additional suggestions.  
Thermostat Setting and Thermostat  
Thermometer Disagree  
1. Thermostat thermometer setting requires  
adjustment.  
The thermometer can be adjusted +/- 3 degrees.  
See Temperature Display Adjustment in the  
Operation section.  
Blank Display and/or Keypad Not  
Responding  
1. Voltage spike or static discharge.  
Use the Reset Operation listed above.  

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