The RTH230B programmable thermostat can be used to control:
Note: This thermostat is not compatible with heat pumps or multistage systems.
IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT POWER TO THE HEATING SYSTEM.
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 the staircase, air outlet, etc.), dead air spots (behind doors), direct sunlight or areas near concealed pipes or chimneys.
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 |
G | Fan |
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.
2.3.3 3-wire Heating
2.3.4 3-wire Cooling
2.3.5 4-wire Heating and Cooling
2.3.6 5-wire Heating and Cooling
The jumper defines the fan operation when the fan is placed in automatic mode.
HE | Use this setting if you have an electric furnace. In this setting, when the fan is placed in automatic mode, it works only when heating or cooling is activated. |
HG | 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, 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. |
After the batteries are installed, the thermostat performs a series of tests for approximately 5 seconds.
Afterward, the screen displays the actual temperature. It is normal that the displayed temperature be higher than the ambient temperature if you are holding the thermostat The thermostat will display the ambient temperature once it is installed on the wall. By default, the setpoint is 70°F (21°C).
Use the selector switch to place the system in Heating mode (HEAT) or Cooling mode (COOL), or to set 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.
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.
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 controlled by the furnace fan control circuitry. |
ON | The fan is always on. |
The actual temperature is normally displayed. To view the setpoint, press once on one of the
5 seconds along with the icon.
Note: Pressing either of the buttons more than once will change the setpoint.
Press one of the
3.5.1 Manual/Permanent Hold Mode
Maintains the temperature at a fixed setpoint. To place the thermostat in this mode, press [ Mode ]. The house icon will disappear.
3.5.2 Programmable Mode
Maintains the temperature according to the energy-saving schedule. To place the thermostat in this mode, press [ Mode ]. The current period will be displayed. The four possible periods are:
To see the default settings of each period, see section 5.2.
Temporary Bypass
If you modify the temperature (using the
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
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.
DISPLAY | DESCRIPTION | DEFAULT | OPTIONS |
Temperature display | °F | °C or °F | |
Time display | 12 h | 12 h or 24 h | |
Early Start1 | Off | On or Off | |
Heating cycles per hour 2 | 4 | 2, 3, 4, 5 or 6 3 | |
Cooling cycles per hour 2 | 4 | 2, 3, 4, 5 or 6 4 |
Your thermostat is preprogrammed with an energy-saving schedule.
The schedule automatically controls your heating or cooling system by switching from one set point to the next according to the present
times.
Default schedule settings | Monday to Friday | Saturday & Sunday | ||
Heating | 70°F (21°C) | 6:00 a.m. | 6:00 a.m. | |
Cooling | 78°F (25.5°C) | |||
Heating | 62°F (16.5°C) | 8:00 a.m. | – | |
Cooling | 85°F (29.5°C) | |||
Heating | 70°F (21°C) | 6:00 p.m. | – | |
Cooling | 78°F (25.5°C) | |||
Heating | 62°F (16.5°C) | 10:00 p.m. | 10:00 p.m. | |
Cooling | 82°F (28°C) |
To use the schedule, place the thermostat in programmable mode.
You can program up to 4 periods per day, each period having its own temperature settings. The same program is repeated daily from Monday through Friday and another program is used for Saturday and Sunday. For each period, you can set the start time, the heating
setpoint and the cooling setpoint.
Note: If you wish to use only 2 periods, set periods “1 and 4” or periods “2 and 3”. Early Start will not work if you set periods “1 and 2” or periods “3 and 4”.
Power supply: 2 AA batteries
Maximum load: 1 A @ 24 Vca 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)
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. Hat 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,
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 that 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 1800-468.1502. In Canada. write Retail Products ON15-02H. Honeywell Limited/Honeywell Limitee, 35 Dynamic Drive. Toronto. 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.
Download Manual:
Honeywell RTH230B Thermostat Installation Guide
Honeywell Home RTH230B Programmable Thermostat Installation and User Manual
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