Honeywell RTH230B Thermostat Installation Guide

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2

3

4

 Wrap the wires around a pencil to prevent  

RTH230B  

them from falling into the wall.  

Programmable Electronic Thermostat  

 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.  

This is a legacy product document  

supported by Resideo. It is no  

longer manufactured  

Installation and User Guide  

2.2 Installing the New Baseplate  

1. Introduction  

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 chim-  

neys.  

The RTH230B 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.  

Adjustment  

buttons  

Display  

 Remove the thermostat faceplate.  

 Loosen the locking screw to separate the thermostat from its  

baseplate (the screw cannot be completely removed).  

Programming  

buttons  

System operating  

mode selector  

Fan operating  

mode selector  

 Tilt the thermostat upwards.  

Features  

 Mark and bore the appropriate mounting holes (or use the  

• System operating mode selection: heat, cool or off  

existing holes). Insert the plastic anchors.  

• Fan operating mode selection: automatic or on (continuous)  

 Pass the wires through the opening of the baseplate and fix the  

baseplate to the wall using the screws provided.  

• Programmable heating and cooling cycle lengths: 10, 12, 15, 20  

or 30 minutes  

2.3 Connecting the Thermostat  

• Temperature display in °F or °C  

• Battery replacement indicator  

• 5-2 programming including:  

The connection of the new thermostat should be similar to that of  

the old thermostat; however, it can vary depending on the installa-  

tion.  

- Preprogrammed energy-saving schedule  

- Early Start  

- Temporary bypass  

- Time display (12 h or 24 h)  

Rh  

Rc  

W

Y

Heating power supply  

Cooling power supply  

Heating signal  

Cooling signal  

Fan  

• Filter replacement indicator  

2. Installation  

G

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.  

2.1 Removing the Old Thermostat  

IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT  

POWER TO THE HEATING SYSTEM.  

 Remove the old thermostat to access the wires.  

Warning: If the old thermostat was mounted onto an electrical box,  

it was probably powered by 120/240 volts. In this case, this thermo-  

stat cannot be used.  

 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).  

69-1800-03  

RTH230B  

69-1800—03 03-11 1/4  

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General	Details
Name	Honeywell RTH230B Thermostat Installation Guide
Make	Honeywell
Language	English
Filetype	PDF (Download)
File size	0.46 MB

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• ALL THERMOSTAT INSTRUCTIONS & USER MANUALS
• Honeywell

Honeywell RTH230B Thermostat Installation Guide Overview

Summary of Contents

• Page 1: 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 to avoid air draughts behind the thermostat. This is a legacy product document supported by Resideo. For a new installation, choose a location approximately 5 feet above the floor and on an inside wall. The RTH230B programmable thermostat can be used to control various heating and cooling systems. This thermostat is not compatible with heat pumps or multi-stage systems. Remove the thermostat faceplate and loosen the locking screw to separate the thermostat from its baseplate. Mark and bore the appropriate mounting holes or use existing holes. The connection of the new thermostat should be similar to that of the old thermostat. In order to avoid any risk of electric shock, cut power to the heating system.
• Page 2: 2-wire heating setting defines fan operation in automatic mode for electric furnaces. For gas or fuel oil furnaces, the fan operates based on the furnace fan control circuitry. In 2-wire cooling, the fan works only when cooling is activated in cool mode. 3-wire heating installation involves pulling out the battery cover, installing batteries, and reinstalling the cover. After battery installation, the thermostat performs tests and displays the actual temperature. The displayed temperature may be higher than the ambient temperature if the thermostat is held. By default, the setpoint is 70°F (21°C). In 4-wire heating and cooling, the thermostat is mounted on the baseplate and secured with a locking screw. The selector switch allows setting the system to heating, cooling, or off. In cooling mode, there may be a wait of up to five minutes before cooling starts due to a safety feature.
• Page 3: Fan operating modes include automatic and continuous. A battery replacement indicator icon appears when batteries need changing and will flash for 120 days. After replacing batteries, readjust the time and day, but temperature and program settings are saved. For electric furnaces, the fan operates only when heating or cooling is activated. Before removing batteries, set the system switch to Off to prevent the unit from running. The configuration menu can be accessed by pressing both buttons simultaneously for 3 seconds. The actual temperature is displayed normally, and the setpoint can be viewed by pressing the buttons briefly. In manual mode, the thermostat maintains a fixed temperature setpoint. Programmable mode allows the thermostat to follow an energy-saving schedule with specific periods for different times of the day. An icon indicates when the filter needs replacement after 500 hours of operation.
• Page 4: Energy-saving schedule is preprogrammed in the thermostat. The schedule automatically controls heating or cooling systems based on preset times. Power supply requires 2 AA batteries. Setpoint range for heating is 41 to 82°F (5 to 28°C). Setpoint range for cooling is 59 to 95°F (15 to 35°C). Honeywell warrants the product to be free from defects for one year from the date of purchase. If the product is defective, it can be repaired or replaced at Honeywell's option. You can program up to 4 periods per day with individual temperature settings. This warranty does not cover removal or reinstallation costs. For questions about the operation of the thermostat, contact Honeywell Customer Care.