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CONTENTS
Installation Instructions for
Heating & Air Conditioning
1E78
Non-Programmable Heat Only Thermostat
Preparations...
Thermostat Details.
Removing Old Thermostat
Mounting and Wiring..
Check Thermostat Operation ..3
Specifications.4
Troubleshooting.4
YOUR THERMOSTAT REPLACES
Typical System Compatibility Chart___
Standard Heat Oniy Two Wire Gas or Oil Fired Systems (24 volt)
Electronic Ignition Heat Only Two Wire Systems (24 voit)_
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)
Standard Heat/Cooi Systems (24 volt)_
~Heat/Cool Systems Electric Heat (24 voit)
Heat Only Electric Heat Systems (24 volt)_
'
Cool Only Systems_
'
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 Wai! Furnaces
12 VDC Mobile Home Application
Multistage Systems
Systems Exceeding 30VAC, 1.5. Am
0 PREPARATIONS
Assemble tools required as shown below.
HAND OH POWER
DRILL WITH 3/16 INCH
CHILL SIT. IF NEEDED
FLAT BLADE SCREWDRIVER •
WIRE CUTTER/STR1PPEH
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.
THERMOSTAT DETAILS
Mounting
Hole
Base
Mounting
Back of
Hole
Thermostat Body
W904 - clip for Celcius display
W905 - clip for hydronic system
Figure 1. Thermostat
© REMOVING OLD THERMOSTAT
A
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 thermostaf 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 snap-on or hinge type.
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 using
the labels enclosed with the new thermostat.
5. Disconnecfthe 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.
EMERSON.
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
PART NO. 37-6620A
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