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Manual Honeywell RTH2520 Thermostat

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Manual

RTH2520 69-1867EF-1 13/6/06 1/4

The RTH2520 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.

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

• Backlit display

• Battery replacement indicator

• 7-day programming including:

- Preprogrammed energy-saving schedule

- Early Start

- Temporary bypass

- Time display (12 h or 24 h)

• Filter replacement indicator

• Automatic daylight savings changeover

• Interchangeable faceplates (titanium, charcoal & taupe)

2.1 Removing the Old Thermostat

IN ORDER TO AVOID ANY RISK OF ELECTRIC SHOCK, CUT

POWER TO THE HEATING/COOLING 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 in order to separate the thermostat

from its baseplate (the screw cannot be completely removed).

p Gently tilt the thermostat upwards.

q Mark and bore the appropriate mounting holes (using a 3/16”

drill bit) 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

Refer to the following table for matching the wire labels with the

thermostat terminals.

Note: Do not connect wires identified as C, X or B. Wrap the bare

end of these wires with electrical tape.

Important: The red jumper wire between Rh and Rc terminals must

be removed in a 5-wire installation.

1. Introduction

2. Installation

RTH2520

Programmable Thermostat

Installation and User Guide

Adjustment

buttons

Display

System operating

mode selector

Fan operating

mode selector

Backlight

button

Programming

buttons

RTH2520 terminals Description Wire labels

Rh Heating power supply Rh, R, 4, V

Rc Cooling power supply Rc, R

W Heating signal W, W1, H

Y Cooling signal Y, Y1, M

GFan G, F

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Specifications

Brand	Honeywell
Model	RTH2520
Category	Thermostats
File type	PDF
File size	0.88 MB

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Frequently Asked Questions about Honeywell RTH2520 Thermostat

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

What is the dead zone of a thermostat? Verified

Many modern thermostats have a dead zone. If the temperature deviates less than 4°C from the set temperature, the system will not heat or cool. This so called dead zone of the thermostat prevents the system from turning on and off too often, saving energy.

This was helpful (1592) Read more

What is the best place to mount a thermostat? Verified

The best place for a thermostat is approximately 1,5 meter above the ground. Never place the thermostat nead a radiator or other heat emitting equipment or in direct sunlight. Choose a room that is used often. In most cases this is the living room.

This was helpful (996) Read more