M3375
Recycling Notice
This control contains mercury in a sealed tube.
Do
not
place control in the trash at the end of its
useful life.
If this control is replacing a control that contains
mercury in a sealed tube, do
not
place your old
control in the trash.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of this control, or of an old control
containing mercury in a sealed tube.
If you have questions, call Honeywell Inc. at
1-800-468-1502.
Welcome to the world of energy savings with
your new Honeywell thermostat. The Honeywell
name is your assurance of accurate control and
reliable operation for years to come.
Your new thermostat will automatically lower and
raise the temperature in your home one or more
times every 24 hours. This allows you to signifi-
cantly lower your fuel costs, while awakening (or
returning home) to a comfortable temperature.
Read this manual to learn how to use your new
thermostat.
Table of Contents
Page
Features of Your Thermostat ............................................................................................................. 4
Setting the Temperature..................................................................................................................... 7
Setting Subbase Switches ................................................................................................................. 8
Inserting Clock Batteries .................................................................................................................... 9
Setting the Clock............................................................................................................................... 10
Programming ....................................................................................................................................11
Troubleshooting ................................................................................................................................15
Servicing the Thermostat ..................................................................................................................23
Cycle Rate Adjustment................................................................................................................. 23
Thermometer Adjustment .............................................................................................................24
Warranty........................................................................................................................................... 27
2
369-0639—1