Honeywell Electronic Thermostat User manual

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OWNER’S GUIDE
Electronic
Thermostat
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FAN SYSTEM
Auto On Cool Off Heat
M18535
Set Room
M18539
FAN SYSTEM
Auto On Cool Off Heat Em.Ht.
Em Ht Aux Ht
Set Room

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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 . The ▲ and ▼keys make it
easy for you to change your temperature setting.
• Large digital display. You can easily read the current
room temperature at a glance.
• No need for batteries. Batteries are not required
because your temperature settings are held perma-
nently in memory.

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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
fan goes off and on with the cooling equipment.
In heating, the fan may start a few minutes after
the heating equipment comes on.
On: The fan runs continuously. Use for improved air
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.
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.
Set Room
INDICATOR
M18425
Em Ht

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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.
Set Room
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.
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.
Set Room
M18442
Set Room
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*
SAVINGS FOR TWICE-A-DAY
10°F (5°C) DECREASE*
6TO 8%
9 TO 11%
12 TO 13%
14 TO 15%
16 TO 18%
12 TO 16%
18 TO 22%
23 TO 25%
25 TO 29%
UP TO 30%
PERCENT OF COOLING COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) INCREASE*
SAVINGS FOR TWICE-A-DAY
10°F (5°C) INCREASE*
7TO 9%
10 TO 11%
12 TO 14%
14 TO 19%
11 TO 15%
16 TO 18%
19 TO 22%
23 TO 33%
COOL
HEAT
* YOUR SAVINGS DEPENDS ON HOME SIZE AND ACTUAL HEAT LOSS OR GAIN,
GEOGRAPHIC LOCATION, FREQUENCY OF TEMPERATURES CHANGE,
AND RANGE IN DEGREES OF CHANGE.
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. •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.
Temperature setting
is too warm or cool. •Adjust the temperature by pressing either the ▲or ▼key.