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RTH110B 69-1799-01 11/09 3/4
3.2 Fan Operating Mode
Use the selector switch to set the fan to automatic
mode (AUTO) or continuous mode (ON).
Note: This switch is not used if you have a 2-wire
installation as the fan is not connected to the thermo-
stat.
3.3 Displaying the Temperature
The actual temperature is normally displayed. To view the setpoint,
press once on either of the buttons. The setpoint is displayed
for 5 seconds along with the icon.
Note: Pressing any of the buttons more than once will change
the setpoint.
3.4 Setting the Temperature
Press one of the buttons until the desired temperature is dis-
played.
3.5 Battery Replacement Indicator
An icon appears when the batteries need replacement.
This icon will flash for 120 days, then the thermostat
will cut power to the heating/cooling unit. The icon dis-
appears once the batteries are replaced. The tempera-
ture settings are saved and do not need to be re-entered.
Warning: Before removing the batteries, place the
system switch on the thermostat to Off. Otherwise, the
heating/cooling unit might still be running even after
the batteries are removed.
n To access the configuration menu, press both buttons
simultaneously for 3 seconds.
o To go to the next parameter (menu item), briefly press both
buttons simultaneously.
p To modify a parameter, press one of the buttons.
q Repeat steps 2 and 3 if necessary.
r Press both buttons simultaneously for 3 seconds to exit
the configuration menu.
Power supply: 2 AA batteries
Maximum load: 1 A @ 24 Vac per output
Setpoint range (heating): 41 to 82°F (5 to 28°C)
Setpoint range (cooling): 59 to 95°F (15 to 35°C)
Display range: 23 to 122°F (-5 to 50°C)
Storage temperature: -2 to 122°F (-20 to 50°C)
Temperature display resolution: 1°F (0.5°C)
Accuracy: ± 1°F (0.5°C)
Heating/cooling cycle lengths: 10, 12, 15, 20 or 30 minutes (pro-
grammable)
Compressor short-cycle protection (minimum off time): 5 minutes
Data memory: non-volatile
Dimensions: 5 in. x 3 in. x 1 in. (127 mm x 75 mm x 28 mm)
Honeywell warrants this product, excluding battery, to be free from
defects in the workmanship or materials, under normal use and service,
for a period of one (1) year from the date of purchase by the consumer.
If at any time during the warranty period the product is determined to be
defective or malfunctions, Honeywell shall repair or replace it (at Honey-
well's option).
If the product is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the
place from which you purchased it, or
(ii) call Honeywell Customer Care at 1-800-468-1502. Customer Care
will make the determination whether the product should be
returned to the following address: Honeywell Return Goods, Dock
4 MN10-3860, 1885 Douglas Dr N, Golden Valley, MN 55422, or
whether a replacement product can be sent to you.
This warranty does not cover removal or reinstallation costs. This war-
ranty shall not apply if it is shown by Honeywell that the defect or mal-
function was caused by damage which occurred while the product was
in the possession of a consumer.
Honeywell's sole responsibility shall be to repair or replace the product
within the terms stated above. HONEYWELL SHALL NOT BE LIABLE
FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCI-
DENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY
OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY,
EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PROD-
UCT. Some states do not allow the exclusion or limitation of incidental or
consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEY-
WELL MAKES ON THIS PRODUCT. THE DURATION OF ANY
IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS
HEREBY LIMITED TO THE ONE-YEAR DURATION OF THIS WAR-
RANTY. Some states do not allow limitations on how long an implied
warranty lasts, so the above limitation may not apply to you.
This warranty gives you specific legal rights, and you may have other
rights which vary from state to state.
If you have any questions concerning this warranty, please write Honey-
well Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or
call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Hon-
eywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough,
Ontario M1V4Z9.
If you have any questions about the operation of your thermostat,
please go to www.honeywell.com/yourhome, or call Honeywell
Customer Care toll-free at 1-800-468-1502.
AUTO
• If you have an electric furnace (see section 2.4), the fan works only
when heating or cooling is activated.
• If you have a gas or fuel oil furnace (see section 2.4), the fan works as
follows:
• When the thermostat is placed in cool mode, the fan works only
when cooling is activated.
• When the thermostat is placed in heat mode, the fan is con-
trolled by the furnace fan control circuitry.
ON The fan is always on.
4. Configuration Menu
DISPLAY DESCRIPTION DEFAULT SETTINGS
Temperature display °F °C or °F
Heating cycles per hour
1
4
2, 3, 4, 5 or 6
2
Cooling cycles per hour
1
4
2, 3, 4, 5 or 6
3
1
When either the heating or cooling parameter is displayed, use the system mode
selector switch to alternate between the two parameters.
2
For optimal heating control, use the setting that matches your system as follows:
2=30 min (steam or gravity), 3=20 min (hot water or 90%+ high-efficiency furnace),
4=15 min (gas or oil), 5=12 min (alternate setting for gas or oil), 6=10 min (electric).
3
The corresponding cooling cycle lengths are as follows: 2=30 min, 3=20 min,
4=15 min, 5=12 min, 6=10 min.
5. Technical Specifications
6. Warranty
7. Customer Assistance