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Honeywell RTH230B Thermostat Installation Guide

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)

Heating power supply

Cooling power supply

Heating signal

Cooling signal

Fan

• Filter replacement indicator

2. Installation

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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Honeywell RTH230B Installation Guide: Specifications

Power supply	2 AA batteries
Maximum load	1 A @ 24 Vca per output
Display range	23 to 122°F (-5 to 50°C)
Accuracy	± 1°F (0.5°C)
Storage temperature	-2 to 122°F (-20 to 50°C)

Full specifications, page 4

Honeywell RTH230B compared with other Honeywell thermostats

Specification	Honeywell RTH230B	Honeywell RLV3100	Honeywell RLV3150	Honeywell RLV4300
Power supply	2 AA batteries	240 VAC, 60 Hz	240 VAC, 60 Hz	120/240 VAC, 60 Hz
Maximum load	1 A @ 24 Vca per output	3000 W	12.5 A (resistive only) 3000 W @ 240 VAC	12.5 A (resistive only)
Display range	23 to 122°F (-5 to 50°C)	32 to 122°F ( 0 to 50°C)	0°C to 50.0°C (32°F to 122°F)	0°C to 50.0°C (32°F to 99°F)
Storage temperature	-2 to 122°F (-20 to 50°C)	-4 to 120°F (-20 to 50°C)	-20.0°C to 50.0°C (-4°F to 122°F)	-20.0°C to 50.0°C (-4°F to 120°F)