White Rodgers 1E78-151 Basic Installation

Basic Installation

Single Stage Thermostats

1E78-144 Non-Programmable
1E78-151 Programmable
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For technical support: 1-888-725-9797
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WARNING
!
• Thermostat installation and all components of the
system shall conform to NEC code for class II circuits.
• Do not exceed specified voltage.
• Do not short terminals on gas valve or primary control.
• Route and secure wires to prevent shorting to adjacent
terminals

Mounting and Jumper Options:

Mounting
Hole
RC G RH W
Y O B
Base
NOTE: Earlier models refer to 37-7006 for jumper locations.
Figure 1. Thermostat
Figure 1. Thermostat
Feed wires through the back of the thermostat base and securely
mount to the wall with supplied screws and anchors.
- Switch Electric/Gas Switch to ELEC for Heat Pump or electric
heat application, leave in Gas for gas and oil applications.
- Clip jumper W903 (programmable models only) to disable
Energy Management Recovery feature that starts heat or cool
earlier than the program time.
- Clip jumper W904 for Celsius Display.
- Clip jumper W905 to produce a longer heating cycle which is
normally for hot water or steam (Hydronic Systems).
ELEC GAS
Back of
Mounting
Hole Thermostat Body
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CAUTION
!
• Replace batteries when "Change
• "Change
remaining life.
• System will not operate with dead batteries.

Wiring:

Note: For 2 wire heat only systems connect to RH and W.
Identify each wire attached to the old thermostat using the labels
enclosed with the new thermostat.
THERMOSTAT
REMOVE JUMPER
FOR 2 TRANSFORMER
RC/RH SYSTEMS
ADD JUMPER
FOR HEAT PUMP
APPLICATIONS
NOTE: FOR 2 WIRE HEAT ONLY SYSTEMS CONNECT TO RH AND W
W903
W904
W905
Elec/Gas
Switch
Figure 2. The thermostat buttons and switches
1
( ) Raises temperature setting.
2
( ) Lowers temperature setting.
3
*Time button.
4
*PRGM (program) button.
Figure 8. Thermostat display, buttons and switches
5
*RUN (program) button. Press RUN to resume program.
6
*HOLD button. Press HOLD to bypass the program. Press
RUN to resume program.
7
FAN switch (ON, AUTO).
8
SYSTEM switch (COOL, OFF, HEAT).
* Programmable models only
NOTICE! FREEZE HAZARD
" is displayed.
" indicates batteries have limited
FURNACE/AIR HANDLER
TYPICAL TERMINAL DESIGNATIONS
24V POWER (HEATING)
R-RH
4-M-R5
24V POWER (COOLING)
R-RC-V
HEATING RELAY
W-H-4
FAN RELAY
G-F
COOLING RELAY
Y-Y6
REVERSING VALVE
ONLY REQUIRED FOR HEAT PUMP APPLICAITON
O
REVERSING VALVE ENERGIZED IN COOL MODE
REVERSING VALVE
B ONLY REQUIRED FOR HEAT PUMP APPLICAITON
REVERSING VALVE ENERGIZED IN HEAT MODE
PART NO. 37-7532A
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