Honeywell rth230b User Manual download pdf

RTH230B 69-1800 2/6/05 1/4

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: These thermostats are not compatible with heat pumps or

multi-stage systems.

Features

• System operating mode selection: heat, cool or off

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

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

or 30 minutes

• Temperature display in °F or °C

• Battery replacement indicator

• 5-2 programming including:

- Preprogrammed energy-saving schedule

- Early Start

- Temporary bypass

- Time display (12 h or 24 h)

• Filter replacement indicator

2.1 Removing the Old Thermostat

IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT

POWER TO THE HEATING SYSTEM.

n 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.

o Identify and label each wire (with the corresponding letter on

the wire terminal) and remove them from the terminals.

p If necessary, strip the end of each wire (maximum of 1/4 inch).

q Wrap the wires around a pencil to prevent

them from falling into the wall.

r 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.

2.2 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 chim-

neys.

n Remove the thermostat faceplate.

o Loosen the locking screw to separate the thermostat from its

baseplate (the screw cannot be completely removed).

p Tilt the thermostat upwards.

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

existing holes). Insert the plastic anchors.

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

baseplate to the wall using the screws provided.

2.3 Connecting the Thermostat

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

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

tion.

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.

1. Introduction

2. Installation

RTH230B

Programmable Electronic Thermostat

Installation and User Guide

Display

Adjustment

buttons

System operating

mode selector

Fan operating

mode selector

Programming

buttons

Rh Heating power supply

Rc Cooling power supply

W Heating signal

Y Cooling signal

GFan

1 2 3 4

Summary of Contents

Page 1 - 2. Installation

RTH230B 69-1800 2/6/05 1/4The RTH230B programmable thermostat can be used to control: • a gas, fuel oil or electric furnace - 2 or 3 wir

Page 2 - 3. Basic Functions

RTH230B 69-1800 2/6/05 2/42.3.1 2-wire Heating2.3.2 2-wire Cooling2.3.3 3-wire Heating2.3.4 3-wire Cooling2.3.5 4-wire Heating and Cooli

Page 3 - 5. Programming

RTH230B 69-1800 2/6/05 3/43.2 Fan Operating ModeUse the selector switch to set the fan to automaticmode (AUTO) or continuous mode (ON).N

Page 4 - 8. Customer Assistance

RTH230B 69-1800 2/6/05 4/45.2 Energy-saving ScheduleYour thermostat is preprogrammed with an energy-saving schedule.The schedule automat

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Honeywell rth230b User Manual

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