Honeywell RTH2520 User Manual [es]

RTH2520

Programmable Thermostat

Installation and User Guide

1. Introduction

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.

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 chimneys.

Display

System operating mode selector

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)

Fan operating mode selector

Adjustment buttons

Programming buttons

Backlight button

2. Installation

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 thermostat cannot be used.

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.

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

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.

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2.3.1 2-wire Heating

2.3.2 2-wire Cooling

2.3.3 3-wire Heating

2.3.4 3-wire Cooling

Jumper

Heat relay

Cool relay

Heat relay

Fan relay

2.4 Setting JP2 Jumper

The jumper specifies how the fan will operate when it is placed in automatic mode (see section 3.2).

Leave the jumper in this position if you

have a gas or oil heating system. Move the jumper to this position if you

have an electric heating system.

JP2 jumper

2.5 Installing the Batteries

n Gently pull out the battery cover. o Install the batteries as shown. Observe the polarity. p Reinstall the battery cover. You will hear a clicking sound.

After the batteries are installed, the thermostat performs a sequence of tests for approximately 5 seconds.

Afterwards, 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. Once installed on the wall, the thermostat will display the ambient temperature. By default, the setpoint is 70°F (21°C).

The time and day settings flash to indicate that they must be set (see section 5.1).

Cool relay

Fan relay

2.3.5 4-wire Heating and Cooling

Jumper

Heat relay

Cool relay

Fan relay

2.3.6 5-wire Heating and Cooling

Fan relay

Heat relay

Note: Remove the red jumper wire between terminals Rc and Rh.

Cool relay

2.6 Completing the Installation

n Once the baseplate and the batteries are installed, mount the

thermostat on the baseplate.

o Secure the thermostat using the locking screw and install the

faceplate.

p Apply power back to the system.

3. Basic Functions

3.1 System Operating Mode

Use this selector switch to place the system in Heating mode (HEAT) or Cooling mode (COOL), or to set both modes to 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. will flash on the screen during the delay.

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3.2 Fan Operating Mode

Use the selector switch to set the fan to automatic mode (AUTO) or continuous mode (ON).

Note: This switch is not used in a 2-wire installation

as the fan is not connected to the thermostat in this type of installation.

AUTO

The fan operates only when the heating or cooling system is On (typical setting).

The fan operates continuously. Use this setting to

improve air circulation and air cleaning.

3.3 Displaying the Temperature

The actual temperature is normally displayed. To view the setpoint, press once on one of the buttons. The setpoint is displayed for 5 seconds along with the icon.

Note: Pressing either of the buttons more than once will

change the setpoint.

3.4 Setting the Temperature

Press one of the buttons until the desired temperature is displayed.

3.5 Backlight

The display illuminates for 12 seconds when the backlight button or either of the buttons is pressed.

3.6 Thermostat Control Mode

3.6.1 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.

3.6.2 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:

Wake up Leave for work Return home Sleep

To see the default program settings, see section 5.3.

Temporary Bypass

If you modify the setpoint (using the buttons) when the thermostat is in Programmable mode, the thermostat will use the new setpoint for the next 2 hours. The house icon flashes during the bypass. Afterwards the thermostat will return to the temperature setting of the period currently underway.

3.7 Filter Replacement Indicator

After 500 hours of operation, an icon appears to indicate that the filter needs replacement. Once the filter is replaced, press [Filter] for 3 seconds to remove the icon and reset the counter.

3.8 Battery Replacement Indicator

Install fresh batteries immediately when the icon starts flashing. The icon flashes for 120 days before the batteries are depleted. You should replace batteries once a year or before leaving home for more than a month even if the icon has not appeared.

After replacing the batteries, set the time, day and date (see sections 5.1 and 5.2). However, the temperature and program settings are saved and do not need to be re-entered.

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.

4. Configuration Menu

DISPLAY DESCRIPTION DEFAULT OPTIONS

Temperature display °F °C or °F

Time display 12 h 12 h or 24 h

Early start

Automatic daylight savings changeover

Heating cycles per hour

Cooling cycles per hour

When Early Start is On, the thermostat determines when to start heating or cooling

so that the desired temperature is reached at the set time.

When this function is On, the thermostat automatically switches to daylight savings time on the second Sunday of March and to normal time on the first Sunday of November (see section 5.2).

Use the Heat/Cool selector switch to switch between the heating parameter and the cooling parameter.

For optimal heating control, use the setting that matches your system as follows: 2=30 min (steam, gravity), 3=20 min (hot water, 90%+ high-efficiency furnace), 4=15 min (gas or oil), 5=12 min (alternate setting for gas or oil), 6=10 min (electric).

The corresponding cooling cycle lengths are: 2=30 min., 3=20 min., 4=15 min., 5=12 min., 6=10 min.

Off On or Off

2, 3, 4, 5 or 6

n To access the configuration menu, press the backlight button

for 3 seconds.

o To go to the next parameter (menu item), briefly press the back-

light button.

p To modify a parameter, press . q Repeat steps 2 and 3 if necessary. r Press the backlight button for 3 seconds to exit the configura-

tion menu.

5. Programming

5.1 Setting the Time and Day

n Press [ Clk ]. The hour flashes. o Set the hour using . p Press [ Clk ]. The minutes flash. q Set the minutes using . r Press [ Clk ]. The day flashes. s Set the day using . (MO: Monday, TU: Tuesday,

WE: Wednesday, TH: Thursday, FR: Friday, SA: Saturday and SU: Sunday).

t Press [ Exit ] to exit.

5.2 Setting the Date

The date is needed for automatic daylight savings changeover.

n Press [ Clk ] for 3 seconds to display the year.

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