Remove the old thermostat to access the wires
Identify and label each wire (with the corresponding letter on the wire terminal) and remove them from the terminals.
If necessary, strip the end of each wire (maximum of 1/4 inch).
Wrap the wires around a pencil to prevent them from falling into the wall.
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.

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.

Remove the thermostat faceplate.
Loosen the locking screw to separate the thermostat from its baseplate (the screw cannot be completely removed).
Tilt the thermostat upwards.
Mark and bore the appropriate mounting holes (using a 3/16” drill bit) or use the existing holes. Insert the plastic anchors.
Pass the wires through the opening of the baseplate and fix the baseplate to the wall using the screws provided

Connecting the Thermostat

Refer to the following table for matching the wire labels with thethermostat terminals.

2-wire Heating
2-wire Cooling

3 wire Heating
3 wire Cooling4 wire Heating and Cooling
5 wire Heating and Cooling

Setting J2 Jumper
The jumper specifies how the fan will operate when it is placed in automatic mode (see section 3.2).

Installing the Batteries

Pull out the battery cover.
Install the batteries as shown. Observe the polarity.
Reinstall the battery cover. You will hear a clicking sound.

Completing the Installation

Once the baseplate and the batteries are installed, mount the thermostat on the baseplate.
Secure the thermostat using the locking screw and install the faceplate.
Apply power back to the system.

Basic Functions

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.

Fan Operating Mode
Use the selector switch to set the fan to automatic mode (AUTO) or continuous mode (ON).

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.

Setting the Temperature
Press one of the buttons until the desired temperature is displayed.

Backlight
The display illuminates for 12 seconds when the backlight button or either of the buttons is pressed.

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.

Configuration Menu

To access the configuration menu, press the backlight button for 3 seconds.
To go to the next parameter (menu item), briefly press the backlight button.
To modify a parameter, press .
Repeat steps 2 and 3 if necessary.
Press the backlight button for 3 seconds to exit the configuration menu

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 (programmable)
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

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,

return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it, or
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,

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.

Customer Assistance

If you have any questions about the operation of your thermostat, please go to http://yourhome.honeywell.com, or call Honeywell Customer Care toll-free at 1-800-468-1502

REFERENCE

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Honeywell RTH1120 Non-Programmable Electronic Thermostat User Guide

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Honeywell RTH1120 Non-Programmable Electronic Thermostat User Guide