Room
Set
FAN SYSTEM
Auto On
Em Ht Aux Ht
Set
Cool Off Heat
Room
M18535
Electronic
Thermostat
OWNER’S GUIDE
FAN SYSTEM
Auto On
Cool Off Heat Em.Ht.
M18539
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Congratulations on the purchase of your new thermostat!
Over 100 years of Honeywell engineering expertise went
into the making of this thermostat in an effort to provide
you with a more comfortable and convenient living
environment.
• Simple and easy to use
easy for you to change your temperature setting.
• Large digital display.
room temperature at a glance.
• No need for batteries.
because your temperature settings are held permanently in memory.
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. The ▲ and ▼ keys make it
You can easily read the current
Batteries are not required
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Settings
Setting FAN and SYSTEM Switches
Fan and system settings are controlled by using FAN and
SYSTEM switches located on the bottom of the thermostat
case.
First set the FAN switch:
Auto: Normal setting for most homes. In cooling, the
On: The fan runs continuously. Use for improved air
fan goes off and on with the cooling equipment.
In heating, the fan may start a few minutes after
the heating equipment comes on.
circulation and air quality.
FAN
Auto On
FAN
SWITCH
M10273
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Then set the SYSTEM switch:
Cool: Normal setting for months when your home
needs cooling (air conditioning). Digital display
shows a snowflake when cooling is on.
Off: Both heating and cooling are off.
Heat: Normal setting for months when your home
needs heating. Digital display shows a flame
when heating is on.
Em. Ht.: (Not available on all models.) Switch to this
setting when your home needs heat, but your
equipment has failed or is not working properly.
SYSTEM
Cool Off Heat Em.Ht.
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SYSTEM
SWITCH
M10274
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Em Ht and Aux Ht Indications
Emergency Heat (Em Ht) and Auxiliary Heat (Aux Ht)
indications are not available on all models. The ▲ indicator
points to either Em Ht or Aux Ht when these modes are
active.
Em Ht: The ▲ indicator points to Em Ht when the
SYSTEM switch is set at Em Ht.
Aux Ht: The ▲ indicator points to Aux Ht when the
living space needs auxiliary backup heat to help
handle the heating load.
INDICATOR
Em Ht
Room
Set
M18425
5
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Displaying Temperature Setting
NOTE: Your temperature setting can be set anywhere
from 40° to 99°F (5° to 37°C).
The temperature setting and the room temperature are
shown separately on the digital display. The ▼ indicator
points to Set when the temperature setting is displayed
and to Room when the room temperature is displayed.
1. To display the temperature setting on the digital
display, press either the ▲ or ▼ key once.
Room
Set
INDICATOR
M18441
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Changing Temperature Setting
1. To lower the temperature setting, press the ▼ key.
When in the heating mode, lowering the temperature
at night or during the day can lower your energy
costs.
Room
Set
M18442
2. To raise the temperature setting, press the ▲ key.
When in the cooling mode, raising the temperature
before you leave for work or school also lowers your
energy costs.
Room
Set
M18443
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Energy Savings
You can save energy with this thermostat in the heating
mode by lowering the temperature setting 5°F (3°C) to
10°F (5°C) at night and during the day. You can also save
energy in the cooling mode by raising the temperature
setting during the day before you leave for work or school.
Savings can be as high as 7% to 33% depending on your
home, where you live, the number of energy saving periods
you choose and your energy savings temperature settings.
If you like saving energy, but would like your thermostat to
automatically change the temperature setting, you might
want to consider purchasing the Honeywell Chronotherm®
Programmable Thermostat. With this thermostat,
temperature settings can be conveniently programmed to
automatically save energy.
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SAVE 7% TO 33% ON ENERGY COSTS
PERCENT OF HEATING COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
6TO 8%
9TO11%
12 TO 13%
14 TO 15%
16 TO 18%
PERCENT OF COOLING COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) INCREASE*
7TO 9%
10 TO 11%
12 TO 14%
14 TO 19%
* YOUR SAVINGS DEPENDS ON HOME SIZE AND ACTUAL HEAT LOSS OR GAIN,
GEOGRAPHIC LOCATION, FREQUENCY OF TEMPERATURES CHANGE,
AND RANGE IN DEGREES OF CHANGE.
SAVINGS FOR TWICE-A-DAY
10°F (5°C) DECREASE*
SAVINGS FOR TWICE-A-DAY
10°F (5°C) INCREASE*
12 TO 16%
18 TO 22%
23 TO 25%
25 TO 29%
UP TO 30%
11 TO 15%
16 TO 18%
19 TO 22%
23 TO 33%
HEAT
COOL
M10278
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Troubleshooting Guide
CAUTION
To avoid possible equipment damage, do not operate
cooling when outside temperature is below 50°F
(10°C). See equipment manufacturer instructions.
Heating or cooling
does not come on.
Temperature setting
is too warm or cool.
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• Check that the SYSTEM switch
on the thermostat is set to Heat
or Cool.
• Check the system fuse or circuit
breaker and replace or reset if
necessary.
• Check for air movement at the
register.
• Check power to the heating or
cooling equipment.
• Adjust the temperature by
pressing either the ▲ or ▼ key.
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If you have questions concerning this thermostat, call
Honeywell Customer Assistance at 1-800-468-1502,
Monday-Friday, 7:00 am-5:30 pm, Central time.
For service, contact your local heating and cooling contractor:
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Automation and Control Solutions
Honeywell International Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9
Copyright © 2000 Honeywell
All Rights Reserved
® U.S. Registered Trademark
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www.honeywell.com/yourhome
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