Emerson 1E78 151 Thermostat User Manual

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CONFIGURATION AND  
TYPICAL WIRING DIAGRAMS  
1E78-151  
Mounting  
Hole  
Reset Operation  
If a voltage spike or static discharge blanks out the display or  
causes erratic thermostat operation you can reset the thermostat  
W906  
W905  
W904  
W903  
by pressing  
,
and TIME at the same time. This also  
RC  
G
RH  
W
resets the factory defaults. If the thermostat has power, has been  
reset and still does not function correctly contact your heating/  
cooling service person or place of purchase.  
Y
O
B
ELEC GAS  
Elec/Gas  
Switch  
Mounting  
Hole  
Back of  
Thermostat Body  
Base  
W903 - clip to disable EMR feature  
W904 - clip for Celcius display  
W905 - clip for hydronic system  
W906 - clip for 5/1/1 day programming  
Figure 1  
JUMPER  
WIRE  
THERMOSTAT  
B
O
Y
G
W
RC  
RH  
THERMOSTAT  
SYSTEM  
Hot  
B
O
Y
G
W
RC  
RH  
SYSTEM  
Cooling  
System Relay System  
Fan  
Heating  
2
2
4 VAC  
120 VAC  
Neutral  
Fan  
Relay  
Heating  
System  
Hot  
HEATING  
TRANSFORMER  
2
4 VAC  
120 VAC  
Neutral  
NOTE  
For 2-wire Heat only,  
attach to RH and W  
Hot  
TRANSFORMER  
4 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  
B
O
Y
G
W
RC  
RH  
SYSTEM  
JUMPER  
WIRE  
JUMPER  
WIRE  
Cooling  
System Relay  
Fan  
THERMOSTAT  
SYSTEM  
B
O
Y
G
W
RC RH  
Hot  
2
4 VAC  
120 VAC  
Neutral  
Reversing Compressor Fan  
Valve* Contactor Relay  
Hot  
TRANSFORMER  
2
4 VAC  
120 VAC  
Figure 3. Typical wiring diagram for  
* Reversing valve is energized when the  
system switch is in the COOL position  
Neutral  
TRANSFORMER  
cool only, 3-wire, single transformer systems  
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  
B
O
Y
G
W
RC RH  
B
O
Y
G
W
RC RH  
Cooling  
System Relay  
Fan  
Heating  
System  
Reversing Compressor Fan  
Valve* Contactor Relay  
Hot  
Hot  
2
4 VAC  
120 VAC  
2
4 VAC  
120 VAC  
*
Reversing valve is energized when the  
system switch is in the HEAT position  
Neutral  
TRANSFORMER  
Neutral  
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  
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