Honeywell RTH3100C User manual

Operating
Manual
RTH3100C
Heat Pump Non-Programmable Digital Thermostat
69-2339EFS-01

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RTH3100C
1 69-2339EFS—01
About your new thermostat
Thermostat features...................................2
Quick reference to controls.......................3
Quick reference to display ........................4
Thermostat Operation
System switch (Heat/Cool)........................5
Fan switch (Auto/On) .................................6
Temperature controls.................................7
Compressor protection..............................8
Appendices
Battery replacement ..................................9
In case of difficulty...................................10
Customer assistance ............................... 12
Accessories............................................. .12
1-year limited warranty............................13
Table of contents

Operating Manual
69-2339EFS—01 2
Congratulations on the purchase of your new Honeywell thermostat. It has been
designed to give you many years of reliable service and easy-to-use, push-button
climate control.
Features
• One-touchtemperaturecontrols
• Large,clearbacklitdisplayiseasytoread,eveninthedark
• Switchablefancontrol(autoorcontinuousfan)
• Displaysbothroomtemperatureandtemperaturesetting
• Built-incompressorprotection
About your new thermostat

RTH3100C
3 69-2339EFS—01
About your new thermostat
M29558
Temperature adjustment
Press to adjust temperature
settings.
Fan Switch (see page 6)
On: Fan runs continuously.
Auto: Fan runs only when
heating or cooling system is on.
Quick reference to controls
System switch (see page 5)
• Cool: Cooling system control.
• Off: All systems off.
• Heat: Heating system control.
• Em Heat: Emergency & Auxiliary
Heat control. Compressor is
locked out.
Digital display screen

Operating Manual
69-2339EFS—01 4
Heat On
Set ToInside
75
75
Replace Batt
M29559
System Status
•Cool On: Cooling system is on.
•Heat On: Heating system is on.
•Em: Emergency heat is on.
•Aux: Auxiliary heat is on.
Quick reference to display screen
Current inside temperature Temperature setting
If flashing, compressor
protection is engaged
(see page 8).
Low battery warning

RTH3100C
5 69-2339EFS—01
M29558
The SYSTEM switch can be set to control
your heating or cooling system, depending
on the season.
• Cool: Cooling system control.
• Off: All systems are off.
• Heat: Heating system control.
• Em Heat: Emergency & Auxiliary Heat
control. Compressor is locked out.
System switch
Set SYSTEM switch to control the
heating or cooling system.
CAUTION: EQUIPMENT DAMAGE
HAZARD. Do not operate cooling
system when outdoor temperature
is below 50°F (10°C).

Operating Manual
69-2339EFS—01 6
M29558
Fan switch
Set the FAN switch to Auto or On.
In “Auto” mode (the most commonly used
setting), the fan runs only when the heat-
ing or cooling system is on.
If set to “On,” the fan runs continuously.
Set FAN switch to choose whether the fan
runs continuously or only as needed.

RTH3100C
7 69-2339EFS—01
About your new thermostat
M29560
Cool On
Set To
78
Inside
75
Temperature controls
Press the temperature adjustment
buttons until the temperature you want
is displayed in the upper right portion of
the screen.
Note: Make sure the SYSTEM switch is set
to the system you want to control (Heat or
Cool).
Desired
temperature
Temperature
adjustment buttons

Operating Manual
69-2339EFS—01 8
Cool On
Set ToInside
75
75
M29561
This feature helps prevent damage to the
compressor in your air conditioning or heat
pump system.
Damage can occur if the compressor is
restarted too soon after shutdown. This fea-
ture forces the compressor to wait for a few
minutes before restarting.
During the wait time, the display will flash the
message Cool On or Heat On. When the safe
wait time has elapsed, the message stops
flashing and the compressor turns on.
Message flashes until safe restart
time has elapsed.
Built-in compressor protection