7 69-0939—1
Replacing a clock thermostat that has
C or C1 clock terminals?
If you are replacing a Honeywell
Chronotherm® Clock Thermostat, you may
find one or two wires that go to the C or C1
clock terminals on the Chronotherm® 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 will 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 multistage heat pump or
other multistage system. The thermostat is
not compatible with such systems so return
the product to the place of purchase. If you
would like information about which program-
mable thermostats will work with your
system, call Honeywell Customer Assistance
Center at 1-800-468-1502.
Three thermostat wires?
If you have three wires for a heating only
system 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 work only if you install an
isolating relay on these systems. For details,
call Honeywell Customer Assistance Center
at 1-800-468-1502.
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