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69-0887—1
Replacing a Clock Thermostat that
has C or C1 Clock Terminals?
If you are replacing a Honeywell Chronotherm®
Thermostat, you may find one or two wires that
go to the C or C1 clock terminals on the
Chronotherm® Thermostat wiring wallplate. Do
not allow them to touch, or you can damage
your transformer. Disconnect the wires and wrap
them
separately, using electrical tape. Do not
wrap them together. Place the wires where they
do not interfere with the operation of the new
thermostat. Record the colors and terminal
designation labels of the remaining wires.
Six or More Wires?
If there are six or more wires (excluding clock
wires attached to terminals), you most likely
have a variation of a heat pump or multistage
system. This thermostat is
not compatible with
such systems. If you would like information
about which programmable thermostats will
work with your system, call Honeywell Customer
Assistance at 1-800-468-1502.
Three Thermostat Wires?
If you have three wires for heating only and
can operate the fan using the fan ON switch,
this thermostat will work with your system;
however, some hot water (zoned) heating
systems have three thermostat wires. The
thermostat will not work without installing an
isolating relay on these systems. For details,
call Honeywell Customer Assistance at 1-800-
468-1502.
Summary of Contents for T8131A
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