Trane LS 90 Thermostat User Manual

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PG 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 turn electricity back on until work is completed.

• 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.

NORMAL

$0.05 KW

ENE

FAN

12:30pm

5/25 WED

• 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.

77^o

23^D_%

Pow

er Status Norm

TUS

al $.05/kW

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

PG 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 ﬂoor, 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, ﬁreplace; 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

Good

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.

5ft.

(1.5m)

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

been completed.

• This thermostat does not require leveling.

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 identiﬁcation.

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 remov-

ing 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.

PG 3

PG 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.

from furnace

IMPORTANT: If you have both RH and RC you need to

remove the metal jumper-clip between these 2 terminals.

Jumper

Clip

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

2.6"

page 13 for wiring info.

Prepare wires

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

ace

Caution

Do not allow wires to touch each other or parts on

thermostat.

• 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).

PG 5

PG 6

Mount the LS-90 to wall

Wall

1. Hold the LS-90 against the wall, with the wires coming over the top

above terminal block. The LS-90 will cover the hole in the wall.

^{2. Position LS-90 for best appearance. Use the optional stand- offs if more}LS-90

space for wires is needed behind the LS-90.

3. Attach the LS-90 to the wall with the screws provided.

4. If you are mounting the LS-90 to sheet rock or if you are using the old

mounting holes, use the plastic anchors provided.

5. Mark �rst and drill a 3/16-in.(4.8mm) hole for the insert at each screw

location, then mount the LS-90.

Wires

Screw to wall

Wall

anchor

HVAC Set-up on screen menu

With all the wires connected (including the C wire), it is time to turn the AC power back on. Do this at

the breaker you used to switch it off. The LS-90 will power-up in the control OFF mode. Your LS-90 is

not con�gured to operate your HVAC system yet. You must now use the menu driven HVAC SET-UP

function.

IMPORTANT: Make sure the LS-90 is powered up and is in the OFF mode before set-up. (To turn

your thermostat off, press the

Power button in the middle of the control bar to the right of the

display and touch OFF). Heating and cooling systems must be con�gured separately.

SET-UP for NORMAL systems (not a heat pump):

1. Press the purple MENU button on the control bar and then touch HVAC SET-UP.

2. Touch to highlight HEAT in the upper left corner of the display.

3. Touch to highlight NORMAL.

4. Select the appropriate number of stages for your heating system (from 1 to 3) by touching the

number of STAGES (in brackets) to highlight, and using the +/- buttons to increase or decrease.

5. Touch the appropriate FAN CONTROL setting.

Select HVAC if your heating system controls the fan (appropriate for most gas, oil, propane and

similar furnaces).

Select TSTAT if you want the thermostat to control the fan (for most electric heating systems).

6. Go on to con�gure COOL or press HOME to return to the Home screen.

PG 7

PG 8

SET-UP for NORMAL A/C cooling systems:

1. Press MENU and then touch HVAC SET-UP.

2. Touch and highlight COOL in the upper left corner of the display.

3. Select the number of stages of compression for your cooling system (1 or 2) by touching the

number of STAGES and using +/- buttons to increase or decrease.

4. Touch to select the appropriate FAN CONTROL setting HVAC or TSTAT.

NOTE: Most cooling systems require that the thermostat TSTAT control the fan.

5. Press HOME to return to the Home screen.

12:30pm WED 77

HVAC SET-UP

HEAT or COOL

STAGES

[1]

NORMAL

HEAT PUMP

AUXILIARY

AUX ELECT or GAS-OIL

FAN CTRL TSTAT

SET-UP for HEAT PUMP systems:

1. Press MENU and then touch HVAC SET-UP.

2. Touch HEAT in the upper left corner of the display.

3. Touch HEAT PUMP.

[1]

[NONE]

BACK>

4. Select the number of stages of compression for your heat pump system (1

or 2) by touching the number of STAGES, and using the +/- buttons to increase or decrease.

NOTE: Most heat pump systems have one stage of compression.

5. If you have AUXILIARY heat, touch the number of stages (default is [NONE] ) use the +/- buttons to

select 1-2 stages. (NOTE: The LS-90 controls a maximum of 3 stages total between pump and AUX.)

6. (If you have AUX) Select the type of auxiliary heat that you have - Electric or Gas-Oil.

NOTE: Most heat pump systems have electric heat strips for auxiliary heat.

7. Fan Control is set by the LS-90 (tstat) for heat pumps.

8. Press HOME button to return to the Home screen.

NOTE: For heat pump system your cooling is already con�gured since the heat pump unit provides

both heating and cooling.

Fan

control

Temperature

+ / - Buttons

Check HVAC system

Follow these procedures to verify you have correctly installed the

LS-90.

To check Fan (If you connected the G wire - fan relay):

NORMAL

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12:30pm

5/25 WED

1. Touch the FAN icon on the HOME screen and select ON.

2. Verify that air is blowing from the system. Return fan to AUTO

selection for normal operation. Press HOME.

77^o

2^M3^I^D_%

Power Status Norma

EAT

$.05/kWh

To check HEAT mode:

1. Press the mode control

and select HEAT.

Mode

control

^{2. Press the}+ button to raise the target temp to 90F. Allow the

system 2 minutes to respond

3. Verify that heat is blowing from the system.

4. Return mode control

to OFF (leave OFF for 4 minutes before checking COOL)

To check COOL mode (do not operate AC if outside temp is below 65F):

1. Press the mode control and select COOL.

^{2. Press the blue}- button to lower the cool target temperature to 50F.

Allow the system 5 minutes to respond.

3. Verify that cool air is blowing from the system.

4. Return

mode to OFF

PG 9

PG 10

Congratulations, you have successfully installed

your unit. Please proceed to the OPERATING

Guide to initialize the LS-90.

NORMAL

$0.05 KW

ENER

12:30pm

5/25 WED

TARGET

IMPORTANT: After you have labeled and connected your wires,

and followed the correct HVAC set-up, if these check procedures do

ot operate your system call support at 1-877-602-5028 8am-12am EST.

77^o

TEMP

2^M3^I_%^D

Power Status Normal $.05/kWh

HEAT

LS-90 Features

This thermostat can be used with all 24VAC and millivolt

(24VAC external power) heating and cooling systems. It

cannot be used with line voltage systems. This thermostat is digital and your desired heat or cool

temperatures can easily be set on the large touch screen with the +/- buttons. A minimum 4 minute

off time protects heating and cooling compressors from damage. This thermostat uses a new

technique called sequential staging for more comfort with faster reaction to requested temperature

changes.

24VAC is Required -

This thermostat must be run on the HVAC systems 24VAC (C wire) or external 24VAC transformer

connected to the C and RH terminals. The 24VAC “C” wire is the other side of the 24VAC heating

transformer and can be found where the other thermostat wires connect at the wall or at the furnace.

Do not use the common or ground side of the line voltage.

Calibration -

Calibrate controls

Your thermostat was accurately calibrated at the

factory to ±1° F of actual ambient temperature.

You do have the option, however, to change the

display temperature to match that of a previous

thermostat, or to match another thermostat

already in your home, from ±1 - 9°F.

75^o

mWED

CALIBRATE

12:30p

DELTA

FACTOR

-2

To change your Thermostat Calibration:

1. Press MENU and then touch CALIBRATE

2. Use the + / - buttons to adjust the displayed

temperature up or down, as desired.

3. The DELTA FACTOR that appears on the

screen will also automatically increase or

ACTUAL

TEMP

DISPLAYED TEMP

decrease for each 1° adjustment. The large display will show the modi�ed temperature reading that

will be displayed on the HOME screen in normal operation.

4. Press HOME to return to the Home screen .

LCD Screen CONTRAST can be adjusted.

To change LCD Screen CONTRAST

From the CALIBRATE screen:

1. Select CONTRAST and adjust by touching the on-screen < and > controls for best viewing.

2. Press HOME to return to the Home screen.

PG 11

PG 12

FOR EXTERNAL HUMIDIFIER

or DEHUMIDIFIER USING

HVAC SYSTEM's 24VAC

Humidiﬁer -

To use the LS-90 internal humidistat to control an external

humidiﬁer unit, connect it as shown. Connect the H

terminal to the control leg of the humidiﬁer relay. This

allows H to turn the humidiﬁer ON and Off.

LS-90

H or DH

FURNACE R

De-Humidiﬁer -

To HUMIDIFIER

DEHUMIDIFIER

POWE R

24VAC

To use the LS-90 internal humidistat to control an external

De-humidiﬁer unit, connect it as shown. Connect the DH

terminal to the control leg of the dehumidiﬁer relay. This

allows DH to turn the dehumidiﬁer ON and Off.

H or DH

RELAY

FOR EXTERNAL HUMIDIFIER

or DEHUMIDIFIER USING

USING 24VAC ADAPTER

Fresh Air -

The Fresh Air feature uses the EX relay to control a bafﬂe

on a fresh external air source. Connect the 24VAC bafﬂe

to C and EX terminals.

LS-90

H or DH

FOR FRESH AIR BAFFLE

FURNACE R

POWER

LS-90

To HUMIDIFIER

DEHUMIDIFIER

FURNACE R

POWER

ADPT

BAFFLE

H or DH

RELAY

WIRE REFERENCE CHART

Your Wires

LS-90 Terminal

R or V or VR

RH and RC Single power for HEAT and COOL

RH or 4

RH Power for HEAT (RH not connected to RC jumper clip removed)

RC Power for COOL (RH not connected to RC jumper clip removed )

W Heat control

G or F

C or X

W2 2nd stage HEAT or heat pump auxiliary heat

W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat

A 3rd wire for zoned hot water heat (see zoned systems pg14)

Y COOL control or 1st stage compression for heat pump.

Y2 2nd stage COOL control or 2nd stage compression for a heat pump

G FAN control

C Common 24VAC power (to power thermostat ) NOTE: TRANE uses B for this connection

n/a Emergency heat (do not connect, tape off)

n/a System monitor (do not connect, tape off)

n/a Outdoor sensor (do not connect, tape off)

External Humidiﬁer

B or

External De-Humidiﬁer

External fresh air bafﬂe

B Heat pump changeover (cool to heat, powered in heat)

O Heat pump changeover (heat to cool, powered in cool)

B and O

IMPORTANT: If there are both B and O wires (Trane pump

products) DO NOT CONNECT B to B terminal, connect B to C

terminal. If not a Trane product tape off B.

Lennox Heat Pump

V or VR or R

M or Y

Y or W or W2

F or G

Trane Products [American Standard]

RH Power for HEAT

W or W1 or X2

R or O

OX or X2 or C

PG 13

PG 14

Zoned Systems Reference

Your Wires

Radio Thermostat Terminal

2 wire Zoned Hot Water

3 Wire Zoned Hot Water

Motor Driven Valves

R or 5

RH (power)

W or 4

W (heat ON)

Y or G or 6 (the 3rd wire) A (heat OFF)

3 Wire Zoned Hot Water

Solenoid Valves

RH (power)

(heat ON)

W (heat OFF)

Y or G (the 3rd wire)

Notes on your system

Customer support: 877-602-5028 or www.radiothermostat.com

PG 15

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