CONTENTS
Installation Instructions for
Heating & Air Conditioning
1E78
Non-Programmable Heat Only Thermostat
| Preparations ............................................... | 1 |
| Thermostat Details ..................................... | 1 |
| Removing Old Thermostat ......................... | 1 |
| Mounting and Wiring ................................... | 2 |
| Check Thermostat Operation ..................... | 3 |
| Specifications .............................................. | 4 |
| Troubleshooting .......................................... | 4 |
YOUR THERMOSTAT REPLACES
Typical System Compatibility Chart | 1E78 |
Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) | Yes |
Electronic Ignition Heat Only Two Wire Systems (24 volt) | Yes |
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) | Yes |
Standard Heat/Cool Systems (24 volt) | No |
Heat/Cool Systems Electric Heat (24 volt) | No |
Heat Only Electric Heat Systems (24 volt) | No |
Cool Only Systems | No |
Heat Pump Systems (No Aux. or Emergency Heat) | No |
Hot Water Zone Heat Only (Two Wire) Systems | Yes |
Hot Water Zone Heat Only (Three Wire) Systems | No |
Line Voltage Heating or Baseboard 110/240 Volt Systems | No |
Millivolt Systems Floor or Wall Furnaces | Yes |
12 VDC Mobile Home Application | Yes |
Multistage Systems | No |
Systems Exceeding 30VAC, 1.5 Amp | No |
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1 PREPARATIONS
Assemble tools required as shown below.FLAT BLADE SCREWDRIVER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
WIRE CUTTER/STRIPPER
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.
2 THERMOSTAT DETAILS
Mounting
Hole
W905
W904
RC G RH W
Y O B
| Base | Mounting | Back of | |
Hole | Thermostat Body | ||
|
W904 - clip for Celcius display
W905 - clip for hydronic system
Figure 1. Thermostat3 REMOVING OLD THERMOSTAT
!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 subbase, label each wire with 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 ac.The switching subbase, which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate.
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, 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.
4.Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.
5.Disconnect the wires from the old thermostat one at a time.DO NOT LET WIRES FALL BACK INTO THE WALL.6.Install new thermostat using the following procedures.PART NO. | |
of Emerson Electric Co. | |
0451 |