White Rodgers 1F78 User Manual

CONTENTS  
Installation Instructions for  
Preparations.................................................. 1  
Thermostat Details ........................................ 1  
Removing Old Thermostat ............................ 1  
Mounting and Wiring ..................................... 2  
Check Thermostat Operation ........................ 3  
Specifications ................................................ 5  
Troubleshooting ............................................ 5  
Heating & Air Conditioning  
1F78  
Non-Programmable Thermostat  
YOUR THERMOSTAT REPLACES  
PREPARATIONS  
1
Typical System Compatibility Chart  
1F78  
Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt)  
Electronic Ignition Heat Only Two Wire Systems (24 volt)  
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)  
Standard Heat/Cool Systems (24 volt)  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
Assemble tools required as shown below.  
FLAT BLADE SCREWDRIVER  
Heat/Cool Systems Electric Heat (24 volt)  
Heat Only Electric Heat Systems (24 volt)  
Cool Only Systems (24 volt)  
HAND OR POWER  
DRILL WITH 3/16 INCH  
DRILL BIT, IF NEEDED  
Heat Pump Systems (No Aux or Emergency Heat)  
Hot Water Zone Heat Only (Two Wire) Systems  
Hot Water Zone Heat Only (Three Wire) Systems  
Line Voltage Heating or Baseboard 110/240 Volt Systems  
Millivolt Systems Floor or Wall Furnaces  
WIRE CUTTER/STRIPPER  
No  
Yes  
Yes  
No  
12 VDC Mobile Home Application  
Failure to follow and read all instructions carefully  
before installing or operating this control could cause  
personal injury and/or property damage  
Multistage Systems  
Systems Exceding 30VAC, 1.5 Amp  
No  
THERMOSTAT DETAILS  
REMOVING OLD THERMOSTAT  
2
3
Mounting  
hole  
CAUTION  
!
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 wire with the terminal designation it was removed from.  
W
RH  
B
RC  
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.  
G
O
Y
Mounting  
hole  
W904  
W905  
W905  
Clip for  
Hydronic  
System  
c. The switching subbase, which is removed by unscrewing  
themountingscrewsthatholditonthewalloradaptorplate.  
ELEC GAS  
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.  
W904  
Clip for  
Celsius Display  
Electric/Gas  
Switch  
Figure 1. Thermostat base  
4. Identifyeachwireattachedtotheoldthermostatusingthe  
labels enclosed with the new thermostat.  
5. Disconnectthewiresfromtheoldthermostatoneatatime.DO  
NOT LET WIRES FALL BACK INTO THE WALL.  
6. Install new thermostat using the following procedures.  
White-Rodgers is a division  
of Emerson Electric Co.  
PART NO. 37-6615A  
0435  
MOUNTING AND WIRING  
CONTINUED FROM SECOND PAGE  
4
JUMPER  
THERMOSTAT  
SYSTEM  
Hot  
WIRE  
Y
B
O
G
W
RC  
RH  
THERMOSTAT  
SYSTEM  
Y
B
O
G
W
RC  
RH  
Cooling  
System Relay System  
Fan  
Heating  
24 VAC  
120 VAC  
Neutral  
Fan  
Relay  
Heating  
System  
Hot  
HEATING  
TRANSFORMER  
24 VAC  
120 VAC  
Neutral  
NOTE  
For 2-wire Heat only,  
attach to RH and W  
Hot  
TRANSFORMER  
24 VAC  
120 VAC  
Neutral  
Figure 2. Typical wiring diagram for  
COOLING TRANSFORMER  
heat only, 3-wire, single transformer systems  
Figure 5. Typical wiring diagram for  
heat/cool, 5-wire, two-transformer systems  
JUMPER  
WIRE  
THERMOSTAT  
Y
B
O
G
W
RC  
RH  
SYSTEM  
JUMPER  
WIRE  
JUMPER  
WIRE  
THERMOSTAT  
SYSTEM  
Cooling  
System Relay  
Fan  
Y
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  
* 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  
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  
THERMOSTAT  
SYSTEM  
Y
B
O
G
W
RC RH  
Y
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  
Figure 4. Typical wiring diagram for  
heat/cool, 4-wire, single transformer systems  
CHECK THERMOSTAT OPERATION  
5
This thermostat has a time delay between cooling cycles to allow  
the head pressure in the compressor to stabilize. If the tempera-  
ture is adjusted to call for cool within 5 minutes of the last cycle the  
snowflake icon will blink indicating the thermostat is locked out.  
After 3 to 5 minutes, the compressor will start and the snowflake  
icon will stop flashing. This helps prevent the compressor from  
cycling too quickly and is normal operation for the thermostat.  
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.  
Fan Operation  
If your system does not have a G terminal connection, skip to  
1. Move SYSTEM switch to COOL position.  
2. Press  
to adjust thermostat setting below room tempera-  
Heating System.  
ture. The blower should come on immediately on high speed,  
followed by cold air circulation  
1. Turn on power to the system.  
2. Move FAN switch to ON position. The blower should begin to  
3. Press  
to adjust temperature setting above room tem-  
operate.  
perature. The cooling system should stop operating.  
3. Move FAN switch to AUTO position. The blower should stop  
Heating System  
immediately.  
1. Move SYSTEM switch to HEAT position. If the heating system  
Cooling System  
has a standing pilot, be sure to light it.  
2. Press  
to adjust thermostat setting above room tempera-  
ture. The heating system should begin to operate.  
CAUTION  
!
3. Press  
to adjust temperature setting below room tem-  
To prevent compressor and/or property damage, if the  
outdoortemperatureisbelow50°F, DONOToperatethe  
cooling system.  
perature. The heating system should stop operating.  
CHECK THERMOSTAT OPERATION  
CONTINUED FROM THIRD PAGE  
5
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, 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.  
1
2
WHITE-RODGERS  
The Thermostat Buttons and Switches  
FAN  
SYSTEM  
1
2
3
4
(Up arrow) Raises temperature setting.  
(Down arrow) Lowers temperature setting.  
ON AUTO COOL OFF HEAT  
FAN switch (ON, AUTO).  
3
4
SYSTEM switch (COOL, OFF, HEAT).  
The Display  
5
is displayed when the SYSTEM switch is in the HEAT  
position.  
is displayed (non-flashing) when the SYSTEM  
is displayed (flashing)  
switch is in the COOL position.  
6
8
when the compressor is in lockout mode.  
6
7
Displays current temperature.  
LO BATTERYis displayed when the 2 AAAbatteries are  
low and should be replaced. Nothing else will be displayed.  
7
5
Displays currently set temperature (this is blank when  
8
SYSTEM switch is in the OFF position).  
Figure 8. Thermostat display, buttons, and switches  
Operating Features  
TEMPERATURE DISPLAY ADJUSTMENT Your new  
thermostat has been accurately set in our factory. However,  
if you wish, you may adjust your new thermostat temperature  
display to match your old thermostat. This can be accom-  
plished (within a ±3° range) as follows:  
Now that you are familiar with the thermostat buttons and display,  
read the following information to learn about the many features of  
the thermostat.  
SIMULTANEOUSHEATING/COOLINGSETPOINTSTOR-  
AGEYoucanenterbothyourheatingandcoolingsetpoints  
at the same time. There is no need to re-enter the thermostat  
at the beginning of each season.  
1. Press  
or  
at the same time for two seconds with  
the SYSTEM switch in OFF position.  
TEMPERATURE SETTING Press  
or  
until the  
2. Press  
or  
to adjust the displayed temperature to  
display shows the temperature you want. The thermostat will  
keep the room temperature at the selected temperature.  
your desired setting.  
3. Move SYSTEM switch from OFF to exit the feature.  
°F/°C CONVERTIBILITY The factory default setting is  
Fahrenheit. Clipping W904 jumper on the circuit board (see  
fig. 1) will alter this feature to Celsius temperature setting.  
DISPLAY BACKLIGHT (Not available on earlier models.)  
The display backlight improves display contrast in low light-  
ing conditions. Selecting backlight ON will turn the light on for  
a short period of time after any button is pressed. Selecting  
backlight OFF (default) will keep the light off. Turn the display  
backlight feature ON as follows:  
LOW BATTERY INDICATOR If the 2 AAAalkaline  
batteries are low and should be replaced, the display will be  
blank except for LO BATTERY. When the batteries are low,  
pressing any button will cause the display to operate for ten  
seconds. After ten seconds, the display will be blank except for  
LOBATTERY.AfterLOBATTERYhasbeendisplayedfor  
4 weeks, the thermostat will raise the temperature 10° above  
your setpoint in COOL mode and drop the temperature 10°  
below your setpoint in HEAT mode. You cannot program with  
low batteries, but you can override setpoint temperature.  
1. Press  
and  
atthesametimefortwosecondswith  
the SYSTEM switch in HEAT position. The display will  
alternately show -LAND FF(off).  
2. Press  
or  
to change FFto ON.  
3. Move SYSTEM switch to OFF to exit the feature.  
SPECIFICATIONS  
ELECTRICAL DATA  
6
7
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  
Operating Humidity Range:  
0 to 90% RH (non-condensing)  
Shipping Temperature Range:  
-40°F to 150°F  
0 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)  
TROUBLESHOOTING  
Reset Operation  
and still does not function correctly contact your heating/cooling  
service person or place of purchase.  
If a voltage spike or static discharge blanks out the display or  
causes erratic thermostat operation you can reset the thermo-  
Batteries  
stat by pressing  
and  
at the same time while moving  
For optimum performance, we recommend replacing batteries  
the SYSTEM switch from OFF to HEAT. This also resets the  
factory defaults. If the thermostat has power, has been reset  
®
once a year with fresh AAAEnergizer 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.  
No Heat  
1. Pilot light not lit.  
Re-light pilot.  
2. SYSTEM Switch not set to HEAT.  
Set SYSTEM Switch to HEAT and raise setpoint  
temperature 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 below.  
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 manufac  
turer 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  
temperature 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.  
TROUBLESHOOTING  
CONTINUED FROM FIFTH PAGE  
7
Symptom  
Possible Cause  
Corrective Action  
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 Cycles Too Fast or Too Slow  
(narrow or wide temperature swing)  
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, 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.  
Cooling Cycles Too Fast or Too Slow  
(narrow or wide temperature swing)  
1. The location of the thermostat and the size  
of the Cooling System can influence the  
cycle rate.  
The cycle rate for cooling is fixed and can not be  
adjusted. Contact a local service person for  
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.  
2. Battery change required.  
Replace batteries and check heat/cool system  
for proper operation. If a voltage spike occurs use  
the Reset Operation listed above.  
The Emerson logo is a  
trademark and a service mark  
of Emerson Electric Co.  

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