Installation Instructions for
Heating & Air Conditioning
1E78
5/2 Day Programmable Thermostat
YOUR THERMOSTAT REPLACES
Typical System Compatibility Chart | 1E78 |
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Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) | Yes |
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Electronic Ignition Heat Only Two Wire Systems (24 volt) | Yes |
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Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) | Yes |
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Standard Heat/Cool Systems (24 volt) | Yes |
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Heat/Cool Systems Electric Heat (24 volt) | Yes |
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Heat Only Electric Heat Systems (24 volt) | Yes |
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Cool Only Systems (24 volt) | Yes |
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Heat Pump Systems (No Aux or Emergency Heat) | Yes |
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Hot Water Zone Heat Only (Two Wire) Systems | Yes |
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Hot Water Zone Heat Only (Three Wire) Systems | No |
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Line Voltage Heating or Baseboard 110/240 Volt Systems | No |
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Millivolt Systems Floor or Wall Furnaces | Yes |
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12 VDC Mobile Home Application | Yes |
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Multistage Systems | No |
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Systems Exceding 30VAC, 1.5 Amp | No |
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CONTENTS |
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Preparations | 1 |
Thermostat Details | 1 |
Removing Old Thermostat | 1 |
Mounting and Wiring | 2 |
Check Thermostat Operation | 3 |
Programming your Thermostat | 4 |
Specifications | 6 |
Troubleshooting | 6 |
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
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| W905 |
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| W904 |
RC | G | RH W | W903 |
Y | O | B |
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| ELEC | GAS | |
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| Elec/Gas | |
Base | Mounting | Back of | Switch | ||
Hole | Thermostat Body | ||||
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| W903 | - clip to disable EMR feature | |||
| W904 | - clip for Celcius display | |||
| W905 | - clip for hydronic system | |||
3 REMOVING OLD THERMOSTAT
!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.
1.Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts:
a.The cover, which may be either a
b.The base, which is removed by loosening all captive screws.
c.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.
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. | Replaces |
0434 |
