Honeywell RTH2300/RTH221 Programmable Thermostat

Identify System Type

This thermostat is compatible with the following systems:

• Gas, oil or electric furnace
• Central air conditioner
• Hot water system with or without pump
• Millivolt system
• Central heating and cooling system
• Heat pump without auxiliary/backup heat

This thermostat cannot be used on heat pumps with auxiliary/backup heat or on multistage systems.

Do you need assistance? We are here to help. Call 1-800-468-1502.

Step 1: Turn Off Power to Heating/Cooling System

Ensure power to your heating and cooling system is turned OFF. This is typically done via a switch on the furnace or air handler.

[Power Switch Illustration: Shows a switch in the 'ON' position and the 'OFF' position. The user should ensure it is in the 'OFF' position.]

Step 2: Remove Old Thermostat

Carefully remove the old thermostat from the wall. Leave the wallplate attached to the wall with the wires still connected. Do not remove the wallplate yet.

MERCURY NOTICE: Do not put your old thermostat in the trash if it contains mercury in a sealed tube. Contact your local waste management authority for instructions regarding recycling and proper disposal.

[Diagram: Shows an old thermostat being detached from its wallplate, with wires connected to the wallplate terminals. Labels indicate 'Old thermostat' and 'Cover'. Arrows show the direction of removal.]

Step 3: Identify Wires

If any wires are not attached to your old thermostat or are attached to a terminal marked C or C1, they will not be connected to your new thermostat. Wrap the bare metal end of each of these wires with electrical tape, so it cannot touch and short other wires.

Do not use non-connected wires.

Do not use C or C1 wires.

Identify and label each wire using the terminal designations.

IGNORE WIRE COLORS: Use terminal screw designations to identify wires.

[Diagram 1: Shows wires connected to terminals Y, R, G, W on an old wallplate. Wires for C and non-connected wires are also shown.]

[Diagram 2: Shows wires labeled Y, G, R, Rc, W connected to corresponding terminals on a new wallplate.]

Disconnect wires and remove the old wallplate only after all wires are labeled. Wrap the wires around a pencil to prevent them from falling through the wall opening.

Step 4: Mount New Wallplate

1. Loosen the locking screw at the bottom of the thermostat. Note that the screw is captive and cannot be removed from the wallplate.
2. Separate the thermostat from the wallplate (as shown in Figure 1).
3. Position the wallplate against the wall and mark hole positions with a pencil.
4. NOTE: Levelling is for aesthetics only and will not affect the performance of the thermostat.
5. Drill holes at the marked positions and insert supplied wall anchors.
6. Pass the wires through the large opening located at the bottom center of the wallplate (as shown in Figure 2).
7. Secure the wallplate to the wall with supplied mounting screws (as shown in Figure 3).
8. Connect the wires to the terminals.

[Figure 1: Illustration of separating the thermostat from the wallplate.]

[Figure 2: Illustration showing wires being fed through the wallplate opening.]

[Figure 3: Illustration of the wallplate being secured to the wall with screws.]

Step 5: Connect Wires

Typical Wiring

Match each labeled wire with the terminal having the same letter.

[Diagram: Shows wires labeled Y, R, G, W connected to terminals O/B, Y, RC, R, G, W respectively. A note indicates to REMOVE JUMPER IF YOU HAVE BOTH R AND RC WIRES.]

1. Loosen the terminal screws using a screwdriver, insert the wires, then tighten the screws.
2. Push any excess wire back into the wall opening.

Labels don't match? If a wire does not match any terminal designation, refer to the alternate wiring section.

Alternate Wiring

If a labeled wire does not match any terminal designation, consult the following diagram:

[Diagram: Shows various wire labels (C, C1, X, B, Y1, M, R, RH, 4, V, F, W1, H) and their potential terminal connections (O/B, Y, RC, R, G, W). Includes specific instructions:

• 1. REMOVE JUMPER BETWEEN R AND RC IF YOU HAVE WIRES ON BOTH R AND RC.
• 2. DO NOT USE C, C1, OR X WIRE. DO NOT USE B WIRE IF YOU ALREADY HAVE 0 WIRE. WRAP BARE END OF WIRE WITH ELECTRICAL TAPE.
• 3. PLACE A JUMPER (PIECE OF WIRE) BETWEEN Y AND W IF YOU ARE USING A HEAT PUMP WITHOUT AUXILIARY/BACKUP HEAT.

Step 6: Set Heating Fan Control

Set jumper JP1, on the back of the thermostat, if you have connected a wire to the G terminal.

[Diagram: Shows the back of the thermostat with jumper JP1 indicated.]

• HG: Leave the jumper in this factory-set position if you have a gas or oil furnace.
• HE: Place the jumper to this position if you have an electric furnace.

Incorrect jumper setting: An incorrect setting is noticeable in a gas or oil heating system. When heating starts, you will initially feel cold air coming out of the vents as the fan is running before the furnace has enough time to heat up the air.

Step 7: Set Heat Pump Reversing Valve

Set jumper JP2, on the back of the thermostat, if you have a heat pump.

[Diagram: Shows the back of the thermostat with jumper JP2 indicated.]

• O: Leave the jumper in this factory-set position if you have connected O wire to the O/B terminal.
• B: Place the jumper to this position if you have connected B wire to the O/B terminal.

Incorrect jumper setting: The heat pump operation will be reversed, i.e., it will cool in Heat mode and will heat in Cool mode.

Step 8: Install Batteries and Thermostat

1. Install 2 AAA batteries on the back of the thermostat.
2. Align the two brackets on the top of the thermostat with the corresponding slots on the top of the wallplate.
3. Push the thermostat against the wallplate.
4. Tighten the screw at the bottom of the thermostat.
5. Turn power back on at the heating/cooling system.

[Diagram: Shows batteries being inserted into the thermostat and the thermostat being attached to the wallplate.]

Advanced Installation

Refer to the Advanced Installation section for further configuration:

• System setup
• Temperature display
• Time display format
• Heating cycles per hour
• Compressor protection

System Setup

Follow the procedure below to personalize and configure the thermostat according to the heating/cooling system.

1. Press and hold the [Up Arrow] and [Down Arrow] buttons simultaneously (for three seconds) until the display appears as shown below.
2. Press the [Up Arrow] or [Down Arrow] button to change the option.
3. Press the [Up Arrow] and [Down Arrow] buttons simultaneously for one second to advance to the next function.
4. When the last function is displayed, press the [Up Arrow] and [Down Arrow] buttons to save any changes and exit the menu.

NOTE: If you do not press any button for 60 seconds while you are in the setup menu, the thermostat automatically saves any changes made and exits the menu. At any time you can save the changes and exit by pressing the Run button.

[Display Illustration: Shows 'Function number' and 'Option number' on the thermostat screen.]

Temperature Display

Press the [Up Arrow] or [Down Arrow] button to select Fahrenheit or Celsius temperature display.

0 Fahrenheit temperature display (°F)

1 Celsius temperature display (°C)

When the correct setting is selected, press both [Up Arrow] and [Down Arrow] to display the next function.

[Display Illustration: Shows '1' and '0' on the thermostat screen.]

Time Display Format

Press the [Up Arrow] or [Down Arrow] button to select 12-hour display or 24-hour display.

0 12-hour display

1 24-hour display

When the correct setting is selected, press both [Up Arrow] and [Down Arrow] to display the next function.

[Display Illustration: Shows '2' and '0' on the thermostat screen.]

Heating Cycles per Hour

Note: Make sure the system switch is in the heat position.

Press the [Up Arrow] or [Down Arrow] button to select your heating system and optimize its operation:

5 12 min. Gas or oil furnace. Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.

2 30 min. Steam or gravity system. Use this setting if you have a steam or gravity heat system.

3 20 min. Hot water or high-efficiency furnace: Use this setting if you have a hot water system or a gas furnace of greater than 90% efficiency.

4 15 min. Gas or oil furnace. Use this setting if you have a standard gas or oil furnace that is less than 90% efficient.

6 10 min. Electric furnace: Use this setting if you have any type of electric heating system.

When the correct setting is selected, press both [Up Arrow] and [Down Arrow] to display the next function.

[Display Illustration: Shows '3' and '5' on the thermostat screen, representing 2 to 6 cycles per hour.]

Compressor Protection

Press the [Up Arrow] or [Down Arrow] button to select compressor protection:

1 On

0 Off

Damage can occur if the compressor is restarted too soon after shutdown. This feature forces the compressor to wait 5 minutes before restarting. During the wait time, the message 'Cool On' or 'Heat On' flashes on the screen. When the safe wait time has elapsed, the message stops flashing and the compressor turns on.

When the correct setting is selected, press the [Up Arrow] and [Down Arrow] buttons to save any changes and exit the menu.

[Display Illustration: Shows '4' and '1' on the thermostat screen.]

Customer Assistance

For assistance with this product, please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.

One-Year Limited 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:

1. Return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
2. 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, Toronto, Ontario M1V4Z9.

Important Notices

MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. Contact your local waste management authority for instructions regarding recycling and proper disposal.

CAUTION: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50°F (10°C).

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN 55422

Honeywell Limited-Honeywell Limitée

35 Dynamic Drive

Toronto, Ontario M1V 4Z9

http://yourhome.honeywell.com

© 2010 Honeywell International Inc.

Printed in U.S.A.