Honeywell CT1802 User manual

Clock Thermostat
Fuel Saver
•Heat Only—CT1800
•Heat/Cool—CT1801
• Central Heat/Cool or Single Stage Heat Pump without Auxiliary Heat—CT1802
Heating-Only Thermostat and Wallplate or a Heating/Cooling Thermostat and Subbase
Models CT1800, CT1801, CT1802
OWNER’S MANUAL
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Welcome to the world of energy savings with your new Honeywell Fuel Saver Thermostat. The
Honeywell name is your assurance of accurate control and reliable operation for years to come.
Your new thermostat will automatically control the temperature in your home to provide a high
level of comfort plus energy savings when programmed according to the instructions in this manual.
Recycling Notice
This control contains mercury in a sealed tube. Do not place control in the trash a 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.
M3375

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Table of Contents
PAGE
Features Of Your Thermostat ........................................................................................................... 5
Reviewing Your Family Schedule ..................................................................................................... 8
Setting The Temperature .................................................................................................................. 9
Setting Subbase Switches .............................................................................................................. 10
Inserting Clock Batteries ................................................................................................................. 11
Setting The Clock ............................................................................................................................ 12
Programming................................................................................................................................... 13
Troubleshooting .............................................................................................................................. 18
Servicing The Thermostat ............................................................................................................... 22
System On-Time Adjustment .......................................................................................................... 22
Thermometer Adjustment................................................................................................................ 23
Limited One-Year Warranty ............................................................................................................ 25

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Features Of Your Thermostat
1FLIP-UP COVER. Lift it up to set clock for
energy savings and normal temperature
periods.
2THERMOSTAT COVER. Lift up and
remove to adjust heat anticipator or install
batteries.
3 THERMOMETER. Provides accurate
room temperature reading.
4CLOCK. This clock provides a 24-hour
slotted dial to hold the programming pins.
5CLOCK HANDS. Turn minute hand
clockwise to match the correct AM
or PM time to the time indicator
6TIME INDICATOR. Arrowhead indicates
time for 24-hour dial.
7 PROGRAM INDEX WHEEL. Controls
high and low temperature at specific time
of day as set by program pins. Can be
moved to temporarily override a schedule.
12
3
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8 TEMPERATURE SETTING LEVERS.
Left (blue mark) controls the low tempera-
ture; right (red mark) controls the high
temperature.
9 PROGRAM PINS. Must be inserted into
24-hour clock dial slots to control program
index wheel.
10 PIN SLOTS. Located on 24-hour dial at
ten-minute intervals for program pin
insertion.
11 HEAT ANTICIPATOR SCALEPLATE.
Calibrated to match the heating system
current draw in amperes.
12 ANTICIPATOR SETTING LEVER. Must
be adjusted to match the heating system
primary control current.
13 BULB AND BIMETAL ELEMENT
(2). Provide automatic temperature
control by switching on and off the
heating or cooling system.
14 4 5 813
121167109 M9654
14 AAA ALKALINE BATTERIES (2).
Included to provide power to the clock.

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15 WALLPLATE. Provides mounting base
and wiring connections for heating-only
thermostat.
16 SUBBASE. Provides mounting base,
wiring connections and manual switching
control for heating/cooling thermostat.
M2421
15
AUTO OFF COOL HEATON
FAN
B
O
W
Y
R
G
M2411
16

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Reviewing Your Family Schedule
Write the answers to the following questions in the spaces provided to determine the program
that fits your family schedule. SUMMER WINTER
What comfort temperature would you like to maintain? ______ ______
What energy savings temperature would you like to maintain? ______ ______
What time does the first person get up in the morning? ______ ______
Is anyone home all day? ______ ______
What time does the last person leave in the morning? ______ ______
What time does the first person return home in the evening? ______ ______
What time does the last person go to bed? ______ ______

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50
50
60
60
70
70
80
80
12
3
6
9
M8279
LOW TEMPERATURE
SETTING LEVER
HIGH
TEMPERATURE
SETTING LEVER
Setting The Temperature
For Heating:
Set the left lever (blue mark) to the energy
savings temperature you want when you are
sleeping or your home is unoccupied.
Set the right lever (red mark) to the tempera-
ture you want for normal comfort periods.
NOTE: You may override the time program by
setting both the red and blue levers to the
same temperature setpoint.
For Cooling (not applicable on
heating-only model):
Set the left lever (blue mark) to the tempera-
ture you want for normal comfort periods.
Set the right lever (red mark) to the energy
savings temperature you want when you are
sleeping or your home is unoccupied. See Fig. 1.
Fig. 1—Setting high and low temperature
levers.

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Setting Subbase Switches
(if applicable)
The subbase system switch controls
system operation as follows:
HEAT: Heating system is controlled by the
thermostat. Cooling system is off.
COOL: Cooling system is controlled by the
thermostat. Heating system is off.
OFF: Both the heating and cooling systems
are off. If the fan switch is at the AUTO
position, the fan is also off.
AUTO: In a cooling only application, only
cooling operates. In a heating only
application, only heating operates.
The subbase fan switch controls fan
operation as follows:
ON: Fan operates continuously.
AUTO: Fan operates with cooling equipment
as controlled by the thermostat or with the
heating equipment as controlled by the
plenum fan switch. In electric heat, heat
pump, and fan coil systems, the fan is
controlled by the thermostat in heating and
cooling.
To switch positions, use thumb or index
finger to slide lever to desired position. Switch
lever must stop in detent over desired function
indicator mark for proper circuit operation.