RTH110B
69-1799-01
Non-programmable Electronic Thermostat
Installation and User Guide
1. Introduction
The RTH110B non-programmable thermostat can be used to control:
• a gas, fuel oil or electric furnace - 2 or 3 wires
• a central air conditioner - 2 or 3 wires
• a hot water system with or without pump - 2 wires
• a millivolt system - 2 wires
• a central heating and cooling system - 4 or 5 wires
Note: This thermostat is not compatible with heat pumps or multi-
stage systems.
q Wrap the wires around a pencil to prevent
them from falling into the wall.
r If the hole in the wall is too big, insulate it
using a non-flammable material in order
to avoid air draughts behind the thermostat.
2.2 Installing the New Baseplate
For a new installation, choose a location approximately 5 feet
(1.5 m) above the floor and on an inside wall. Avoid draughty
areas (top of staircase, air outlet, etc.), dead air spots (behind
doors), direct sunlight or areas near concealed pipes or chimneys.
Adjustment
Display
System operating
mode selector
Features
• System operating mode selection: heat, cool or off
• Fan operating mode selection: automatic or on (continuous)
• Programmable heating and cooling cycle lengths: 10, 12, 15, 20
or 30 minutes
• Temperature display in °F or °C
• Battery replacement indicator
Fan operating
mode selector
buttons
2. Installation
2.1 Removing the Old Thermostat
IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT
POWER TO THE HEATING SYSTEM.
n Remove the old thermostat to access the wires.
Attention: If the old thermostat was mounted onto an electrical box,
it was probably powered by 120/240 volts. In this case, this thermostat cannot be used.
o Identify and label each wire (with the corresponding letter on
the wire terminal) and remove them from the terminals.
p If necessary, strip the end of each wire (maximum of 1/4 inch).
n Remove the thermostat faceplate.
o Loosen the locking screw to separate the thermostat from its
baseplate (the screw cannot be completely removed).
p Tilt the thermostat upwards.
q Mark and bore the appropriate mounting holes (or use the
existing holes). Insert the plastic anchors.
r Pass the wires through the opening of the baseplate and fix the
baseplate to the wall using the screws provided.
2.3 Connecting the Thermostat
The connection of the new thermostat should be similar to that of
the old thermostat; however, it can vary depending on the installation.
Rh Heating power supply
Rc Cooling power supply
W Heating signal
Y Cooling signal
GFan
Note: The red jumper wire between the Rc and Rh terminals must
be removed in 2- or 5-wire installations. The jumper must be used in
3- or 4-wire installations if you wish to use the mode selector switch
for the fan.
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2.3.1 2-wire Heating
2.4 Setting J2 Jumper
The jumper defines the fan operation when the fan is placed in automatic mode.
2.3.2 2-wire Cooling
2.3.3 3-wire Heating
2.3.4 3-wire Cooling
Heat relay
Cool relay
Heat relay
Fan relay
J2 jumper
Use this setting if you have an electric furnace. In
this setting, when the fan is placed in automatic
HE
mode, it works only when heating or cooling is
activated.
Use this setting if you have a gas or fuel oil furnace. In this setting, when the fan is placed in
automatic mode, it works as follows:
• When the thermostat is placed in cool mode,
HG
the fan works only when cooling is activated.
• When the thermostat is placed in heat mode,
the fan is controlled by the furnace fan control
circuitry.
2.5 Installing the Batteries
n Pull out the battery cover.
o Install the batteries as shown. Observe the polarity.
p Reinstall the battery cover. You will hear a clicking sound.
After the batteries are installed, the thermostat performs a series of
tests for approximately 5 seconds.
Afterwards, the screen displays the actual temperature. It is normal that the displayed temperature will
be higher than the ambient temperature if you hold
the thermostat in your hands. It will display the
ambient temperature after the thermostat is
installed on the wall. By default, the setpoint is 70°F (21°C).
2.3.5 4-wire Heating and Cooling
2.3.6 5-wire Heating and Cooling
Heat relay
Cool relay
Heat relay
Cool relay
Cool relay
Fan relay
2.6 Completing the Installation
Fan relay
n Once the baseplate and the batteries are installed, mount the
thermostat on the baseplate.
o Secure the thermostat using the locking screw and install the
faceplate.
p Apply power back to the system.
Fan relay
3. Basic Functions
3.1 System Operating Mode
Use the selector switch to place the system in Heating
mode (HEAT) or Cooling mode (COOL), or to turn the
system off.
Note: When you place the thermostat in Cooling mode, you might need to
wait up to five minutes before cooling can start. This is a safety feature for
the compressor. will flash on the screen until cooling can start again.
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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 thermostat.
• 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
AUTO
ON The fan is always on.
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 controlled by the furnace fan control circuitry.
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 displayed.
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 disappears once the batteries are replaced. The temperature 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.
4. Configuration Menu
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.
DISPLAY DESCRIPTION DEFAULT SETTINGS
Temperature display °F °C or °F
Heating cycles per hour
Cooling cycles per hour
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.
1
1
4
4
2, 3, 4, 5 or 6
2, 3, 4, 5 or 6
2
3
5. Technical Specifications
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)
6. Warranty
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 Honeywell'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 warranty shall not apply if it is shown by Honeywell that the defect or malfunction 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 INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY
OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY,
EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. 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 HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY
IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS
HEREBY LIMITED TO THE ONE-YEAR DURATION OF THIS WARRANTY. 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 Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or
call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough,
Ontario M1V4Z9.
7. Customer Assistance
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.
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p
Printed in USA
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Menu de configuration
3.
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