Honeywell CT1800 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

M3375

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.

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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

1 FLIP-UP COVER. Lift it up to set clock for

energy savings and normal temperature
periods.

2 THERMOSTAT COVER. Lift up and

remove to adjust heat anticipator or install
batteries.

3 THERMOMETER. Provides accurate

room temperature reading.

4 CLOCK. This clock provides a 24-hour

slotted dial to hold the programming pins.

5 CLOCK HANDS. Turn minute hand

clockwise to match the correct AM
or PM time to the time indicator

6 TIME 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.

1

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2

3

M9653

8 TEMPERATURE SETTING LEVERS.

Left (blue mark) controls the low tempera­ture; 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 AAA ALKALINE BATTERIES (2).

Included to provide power to the clock.

14 4 5

121167109

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13

8

M9654

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.

15

M2421

O

B

R

W

G

Y

16

FAN

AUTO OFF

HEATON

COOL

M2411

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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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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 tempera­ture 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 tempera­ture 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.

LOW TEMPERATURE
SETTING LEVER

12

9

6

80

50506060707080

3

HIGH
TEMPERATURE
SETTING LEVER

M8279

Fig. 1—Setting high and low temperature

levers.

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