Trane LS 90 Thermostat User Manual

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1 6 P G  
. L o c k S t a t e C o n n e c t . c o m  
C u s t o m e r s u p p o r t :  
N o t e s o n y o u  
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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.  
SA  
NORMAL  
$0.05 KW  
V
E
ENE  
R
GY  
FAN  
H
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.  
TA  
R
o
F
G
E
T
77o  
TE  
M
P
H
U
M
I
23D%  
HV  
A
C
Pow  
er Status Norm  
ST  
A
TUS  
H
E
MENU  
A
T
al $.05/kW  
h
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  
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2
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 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, 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  
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.  
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 identication.  
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  
W
wind them around a pencil to keep them from falling.  
• Loosen all screws on the old thermostat and remove it from the  
G
C
wall.  
PG 3  
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4
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  
W
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  
5
m
ro  
u
F
F
ace  
rn  
Caution  
Do not allow wires to touch each other or parts on  
thermostat.  
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).  
PG 5  
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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  
G
W
Wall  
anchor  
7
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 congured 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 congured 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 congure COOL or press HOME to return to the Home screen.  
PG 7  
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8
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 congured since the heat pump unit provides  
both heating and cooling.  
9
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):  
SA  
NORMAL  
V
E
EN  
ER  
G
Y
$0.05 KWA  
F
A
N
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.  
TA  
RG  
ET  
o
F
77o  
T
EM  
P
HU  
2M3ID%  
HV  
A
C
Power Status Norma  
ST  
A
T
U
S
H
EAT  
$.05/kWh  
M
EN  
U
l
To check HEAT mode:  
1. Press the mode control  
and select HEAT.  
Mode  
control  
o
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)  
o
To check COOL mode (do not operate AC if outside temp is below 65F):  
1. Press the mode control and select COOL.  
o
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  
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10  
PG 10  
Congratulations, you have successfully installed  
your unit. Please proceed to the OPERATING  
Guide to initialize the LS-90.  
SA  
VE  
NORMAL  
$0.05 KW  
ENER  
G
Y
F
A
N
H
12:30pm  
5/25 WED  
TARGET  
o
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.  
77o  
F
TEMP  
HU  
2M3I%D  
HV  
A
C
Power Status Norma/kWh  
ST  
AT  
n
U
S
HEAT  
M
EN  
U
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.  
11  
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.  
75o  
mWED  
CALIBRATE  
12:30p  
DELTA  
FACTOR  
-2  
o
F
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  
MENU  
ACTUAL  
TEMP  
DISPLAYED TEMP  
<CONTRAST 5> BACK>  
.
77  
decrease for each 1° adjustment. The large display will show the modied 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  
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12  
PG 12  
FOR EXTERNAL HUMIDIFIER  
or DEHUMIDIFIER USING  
HVAC SYSTEM's 24VAC  
Humidier -  
To use the LS-90 internal humidistat to control an external  
humidier unit, connect it as shown. Connect the H  
terminal to the control leg of the humidier relay. This  
allows H to turn the humidier ON and Off.  
LS-90  
RH  
H or DH  
FURNACE R  
De-Humidier -  
To HUMIDIFIER  
or  
DEHUMIDIFIER  
POWE R  
24VAC  
C
To use the LS-90 internal humidistat to control an external  
De-humidier unit, connect it as shown. Connect the DH  
terminal to the control leg of the dehumidier relay. This  
allows DH to turn the dehumidier 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 bafe  
on a fresh external air source. Connect the 24VAC bafe  
to C and EX terminals.  
LS-90  
RH  
H or DH  
FOR FRESH AIR BAFFLE  
FURNACE R  
POWER  
LS-90  
To HUMIDIFIER  
or  
C
RH  
EX  
DEHUMIDIFIER  
FURNACE R  
POWER  
AC  
ADPT  
BAFFLE  
C
H or DH  
RELAY  
13  
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  
RC  
W
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  
W2  
W3  
?
Y
Y2  
G or F  
C or X  
E
L
T
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 Humidier  
H
DH  
EX  
B or  
O
External De-Humidier  
External fresh air bafe  
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  
Y
W2  
G
B
C
W or W1 or X2  
W2  
R or O  
OX or X2 or C  
C
PG 13  
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14  
PG 14  
Zoned Systems Reference  
Your Wires  
Radio Thermostat Terminal  
2 wire Zoned Hot Water  
R
W
RH  
W
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  
R
W
RH (power)  
(heat ON)  
W (heat OFF)  
A
Y or G (the 3rd wire)  
15  
Notes on your system  
Customer support: 877-602-5028 or www.radiothermostat.com  
PG 15  

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