Trane LS-90 User Manual

16

PG 16

Customer support:877-254-5625 or www.LockStateConnect.com

1

LS-90 Installation Guide

Caution

• Your thermostat is a precise instrument, handle it with care.

• Turn off electricity to the HVAC system before installing or

servicing thermostat or any part of the system.

• Do not short (jumper) across electric terminals at the control

on the furnace or air conditioner to test the system. This may
damage the thermostat.

• All wiring must conform to local codes and ordinances.

• This thermostat is designed for use with 24 volt AC and
millivolt systems (with a separate 24VAC power adapter).

• The thermostat relay load should be limited to 1.0 amp;

higher amperage may cause damage to the thermostat.

Notes on your system

PG 1

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Caution

To avoid electrical shock and to prevent damage to the
furnace, air conditioner, and thermostat, disconnect the power
supply before beginning work. This can be done at the circuit
breaker, or at the HVAC system.

ENGLISH

2

TOOLS

You will need a small Phillips screwdriver and a drill with 3/16-in. (4.8mm) bit for wall mounts.

LOCATION

Replacement installations - mount the LS-90 in place of the thermostat. You must have a “C” wire or
other 24VAC power available at the LS-90 location. A new location will require moving your wiring.
New installations and for re-locating the LS-90 - follow the guidelines listed below:

• Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the fl oor, and in a room that
is used often.

• Do not install it where there are unusual heating conditions, such as: in direct sunlight; near
a lamp, radio, television, radiator register, fi replace; near hot water pipes in a wall; or near a
stove on the other side of a wall.

• Do not locate in unusual cooling conditions, such as: on a wall
separating an unheated room; or in a draft from a stairwell, door,
or window.

• Do not locate in a damp area. This can lead to corrosion that will
shorten thermostat life.

• Do not locate where air circulation is poor, such as: in a corner, an
alcove; behind an open door.

• Do not install the LS-90 until all construction and painting has
been completed.

• This thermostat does not require leveling.

Good

5ft.

(1.5m)

PG 2

3

REMOVE OLD UNIT

Switch OFF electricity to the furnace and air conditioner; then follow these steps.

• Remove cover from old thermostat. Most are snap-on types and simply pull off. Some have locking
screws on the side or front. These must be loosened. DO NOT remove wires. Note the letters
printed near the terminals. Attach labels (enclosed) to each wire for identifi cation.

Caution

Read instructions carefully before removing any wiring from
existing thermostat. Wires must be labeled before they are
removed. THERE IS NO STANDARD COLOR CODE. When remov­ing wires from their terminals, ignore the color of the wires and
LABEL THEM by the terminal where they were screwed.

• Label the wires one at a time. You must label all the wires
before you proceed. With all wires labeled, remove them from
the old unit.

• Make sure the wires do not fall back inside the wall. You can
wind them around a pencil to keep them from falling.

• Loosen all screws on the old thermostat and remove it from the
wall.

G

C

W

PG 3

4

What wires do you have?

Make sure your wires are labeled. This may require you to nd the ‘other end’ connection for each
wire on your heating or air conditioning equipment and read the label there. Refer to the Wire
Reference page 13 for better understanding of wire labels from different HVAC system makers.

IMPORTANT: C wire or 24VAC power is required for the LS-90 to operate. If you do not have a C
wire you can run a new wire from the HVAC to the LS-90 or provide 24VAC power to operate the
LS-90 using a standard 24VAC wall transformer.

IMPORTANT: If you have both RH and RC you need to
remove the metal jumper-clip between these 2 terminals.

IMPORTANT: If you have both O and B you must check

Prepare wires

page 13 for wiring info.

Please follow these guidelines for safe and
secure wire connections:

• You will need at least 2.6” of wire for each of your connections to the LS-90.

• If you do not have enough wire, splice additional wire to allow enough slack.

• Fan out wires below the hole as shown.

• Remove insulation 1/8” from the tip of each wire.

• Take care not to damage the labels for each wire in handling.

Screw terminal

Jumper
Clip

C

from furnace

W

Y

RH

PG 4

2.6"

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Caution

Do not allow wires to touch each other or parts on
thermostat.

C

W

• Fan wires out as illustrated with LS-90 below the
wall opening. As in the example: fan out the wires so
that the C wire is above the C terminal the W above
the W. This allows the LS-90 to

t snug to the wall.

• Wires will position behind the LS-90 and up over the
terminal area.

• Do not bunch wires behind LS-90. Feed any slack
back into the wall opening.

Connect your wires

• Connect labeled wires only to a terminal with the

same letter label.

• Insert the wire in the terminal well and tighten the screw securely.

• Do not over-tighten, this will cut the wire.

• If a 24VAC transformer [Radio Shack PN273-1690] is used, connect to the C and RH terminals (no

polarity).

RH

Y

G

PG 5