Lennox X4146 Installation Instructions Manual

E2005 Lennox Industries Inc.

Dallas, Texas, USA

Elite® Series 1 Heat / 1 Cool Programmable

Touch Screen Thermostat

INSTALLATION

INSTRUCTIONS

WARNING

This thermostat is to be installed by a qualified service technician or
other qualified agency in accordance with the manufacturer’s instruc­tions, all codes, and requirements of the authority having jurisdiction.

505,043M
10/2005

Page 2

Table of Contents

General...................................Page 2

Shipping and Packing List........Page 2

NecessaryTools.......................Page 2

Thermostat Location................Page 2

Remove Existing Thermostat...Page 3

Thermostat Installation............Page 4

Wiring Connections..................Page 4

LED Indicator...........................Page 5

Outdoor Temperature Sensor...Page 5

Field Wiring Diagrams..............Page 6

Install Batteries........................Page 8

Attach T’stat to Wallplate..........Page 8

Set Calendar and Clock............Page 8

Installer Set−Up........................Page 9

System Test...........................Page 15

Troubleshooting.....................Page 16

General

The Lennox Elite® Series X4146 ther­mostat provides control for single−
stage heating and cooling. The ther­mostat may be used to control either a
conventional HVAC system which in­cludes an outdoor condensing unit and
indoor furnace or a heat pump unit and
indoor air handler. The thermostat ter­minal block accommodates 24V power
common from the furnace or air han­dler. Three AAA alkaline batteries are
provided to be used as an alternate
power source or as a back−up in case
of an interruption of power.

Shipping and Packing List

Package 1 of 1 contains

1 − Assembled thermostat

(includes wallplate and thermostat)

1 − Bag assembly containing the fol-

lowing:

2 − Screws

2 − Wall anchors

3 − AAA alkaline batteries

1 − Installation instruction

1 − Owner’s guide

1 − Warranty certificate

Necessary Tools

• No. 2 Phillips screwdriver

• Standard pocket screwdriver

• Drill

• Drill bits (use 3/16" for drywall and

7/32" for plaster)

• Pencil

• Level

• Hammer

• Electrical tape

Thermostat Location

Install the thermostat about 5 feet
(1.5m) above the floor in an area with
good air circulation.

Do not install the thermostat where it
may be affected by the following:

• Drafts or dead spots behind doors
and in corners.

• Hot or cold air from ducts.

• Radiant heat from the sun or ap-

pliances.

• Concealed pipes or chimneys.

• Adjacent unconditioned areas

(outside wall behind the thermo­stat)

Page 3

Remove Existing Thermostat

If this thermostat is being used to re­place an existing thermostat, remove
the old thermostat:

1 − Turn off power at the heating and/or

cooling system or fuse/circuit
breaker panel.

2 − Remove the cover from the existing

thermostat.

3 − Remove securing screws and re-

move existing thermostat from wall
or wallplate. Disconnect the exist­ing wires.

4 − Remove any remaining portion of

the existing thermostat from the
wall. Do not install the replacement
thermostat faceplate on the exist­ing wallplate. Though the wall­plates may appear to be the same
and the faceplate may fit on the ex­isting wallplate, the terminal posi­tions may vary in important ways.
In addition, serial number and part
number information is carried on
the replacement wallplate.

Do not allow the thermostat wires
to fall behind the drywall.

WARNING

This thermostat must be
installed using the provided re­placement wallplate.

Failure to do so will bypass ther­mostat control and activate con­tinuous heating.

Y

G

C

R

W

OLD THERMOSTAT

.18

.

2

.

25

.

3

.

9

.

7
.

5

.

4

L
O

N

G

E

R

THERMOSTAT

COVER

WALLPLATE

WARNING

MERCURY NOTICE

If the existing thermostat includes a mercury bulb, the thermostat must
be disposed of properly.

Contact your local waste management authority for instructions re­garding recycling and proper disposal of thermostats which include
mercury bulbs.

Page 4

Thermostat Installation

The thermostat may be installed hori­zontally in a 4 in. X 2 in. (101.6 mm X

50.8 mm) wiring box or on the wall us­ing the provided anchors.

1 − Separate the wallplate from the

thermostat as shown.

THERMOSTAT

WALLPLATE

WIRE HOLE

2 − Pass the labeled wires through the

hole on the wallplate.

3 − Position the wallplate on the wall

with the arrow pointing up. Level
the wallplate (for appearance only)
and use a pencil to mark the mount­ing holes.

WALLPLATE

LEVEL

PLACE LEVEL ON
SUPPORT TABS

MARK
MOUNTING
HOLES (2)

4 − If anchors are used, move the wall-

plate aside and drill two new holes
(3/16" for drywall; 7/32" for plaster).

5 − Tap the provided wall anchors into

the drilled holes until the back of the
anchor head touches the wall sur­face.

6 − Position the wallplate over the an-

chors and pull the thermostat wires
back through the wiring opening.

7 − Secure the wallplate using the pro-

vided screws.

DRILLED
HOLES (2)

WALL
ANCHORS (2)

MOUNTING
SCREWS (2)

WALLPLATE

NOTE

Thermostat heat function will
not operate if thermostat has
been stored at, or is being used
in, ambient temperatures at or
above 90°F. Heat function will be
enabled after thermostat has
been placed in ambient tempera­tures less than 90°F for about 30
minutes.

Wiring Connections

WARNING

Use minimum 18 guage wire for
all thermostat connections.

IMPORTANT

Do not connect the wires to this
thermostat based on wire color.
Improper wiring may cause
damage to the HVAC system.

Page 5

1 − Make wiring connections per the

appropriate wiring diagram on
pages 6 and 7. Refer to the table
below for terminal designations.

Terminal Description

W

First−stage heating

(conventional)
S1 Remote outdoor sensor
S2 Remote outdoor sensor

R 24V power
O Reversing valve
B Reversing valve
G Fan relay

Y

First−stage compressor

(Conventional or

heat pump)

C 24V common

L Equipment monitor

2 − Refer to inner terminal labels when

using the thermostat with conven­tional systems (gas, oil or electric
heat plus air conditioning). Refer to
outer terminal labels in heat pump
applications. See figure below.

3 − Loosen screws of terminals that will

be used. Insert appropriate wires in
the terminal block under the loos­ened screws. Securely tighten
each screw.

C

Y

B

O

R

G

INSERT WIRE IN HOLE

WIRE HOLE

WALLPLATE

SCREW

TERMINALS

LETTER

DESIGNATIONS

LABELED WIRES

TERMINAL

BLOCK

4 − Connect wires to the correspond-

ing screw terminals per the ap­propriate diagram.

5 − Push excess wire back into the

wall.

6 − Plug hole with nonflammable in-

sulation to prevent drafts from af­fecting thermostat.

LED Indicator

An LED indicator is located in the up­per right corner of the thermostat. It is
only visible when lit.

When an equipment monitor is con­nected to the thermostat L terminal,
the LED lights when the monitor sends
a check or failure message to the ther­mostat.

The LED requires the use of 24Vac
common power. The indicator will not
light when the thermostat is powered
by the batteries alone, or when 24Vac
power is interrupted.

Outdoor Temperature Sensor

Install the optional outdoor tempera­ture sensor (X4148) as outlined in the
instructions provided with the sensor.