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Remove Existing Thermostat
If this thermostat is being used to re-
place an existing thermostat, remove
the old thermostat:
1 − Turn off power at the heating and/
or cooling system or fuse/circuit
breaker panel.
2 − Remove the cover from the exist-
ing thermostat.
3 − Remove securing screws and re-
move existing thermostat from
wall or wallplate. Disconnect and
label the existing wires.
4 − Remove any remaining portion of
the existing thermostat from the
wall. Do not install the replace-
ment thermostat faceplate on the
existing wallplate. Though the
wallplates may appear to be the
same and the faceplate may fit on
the existing wallplate, the terminal
positions may vary in important
ways. In addition, serial number
and part number information is
If the existing thermostat includes a mercury bulb, the thermostat must
be disposed of properly.
Contact your local waste management authority for instructions re-
garding recycling and proper disposal of thermostats which include
mercury bulbs.
This
installed using the provided re-
placement wallplate.
Failure to do so will bypass ther-
mostat control and activate con-
tinuous heating.
G
C
WARNING
MERCURY NOTICE
Page 3
carried on the replacement wall-
plate.
Do not allow the thermostat wires
to fall behind the drywall.
WARNING
thermostat
OLD THERMOSTAT
WALLPLATE
Y
W
R
.18
.2
.9
.7
.5
O N
GE R
.4
.25
.3
must
be
THERMOSTAT
COVER
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Do you have a question about the X4147 and is the answer not in the manual?
Questions and answers
the light does not come on by touch either with batteries or wiring
The Lennox X4147 thermostat light does not turn on when powered by batteries alone or when 24Vac power is interrupted. This means that the indicator requires 24Vac power to function properly. If the thermostat is not lighting up, check if the 24Vac power supply is connected and working. If using batteries, ensure they are installed correctly, but note that the light will not turn on with battery power alone.
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should the breaker be off before doing this? Align the terminal blocks on thewallplate with the pins on the backof thermostat.2 − Push the thermostat straight ontothe pins until it snaps into place.3 − Turn on power at the furnace or airhandler or at the fuse or circuitbreaker
Yes, the breaker should be off before installing the Lennox thermostat with part number X4147.
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